US20010003907A1 - Personal cooling apparatus and method - Google Patents
Personal cooling apparatus and method Download PDFInfo
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- US20010003907A1 US20010003907A1 US09/748,323 US74832300A US2001003907A1 US 20010003907 A1 US20010003907 A1 US 20010003907A1 US 74832300 A US74832300 A US 74832300A US 2001003907 A1 US2001003907 A1 US 2001003907A1
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- Prior art keywords
- air
- thermally conductive
- layer
- garment
- conductive material
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Classifications
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- A—HUMAN NECESSITIES
- A41—WEARING APPAREL
- A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
- A41D13/00—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches
- A41D13/002—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches with controlled internal environment
- A41D13/005—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches with controlled internal environment with controlled temperature
- A41D13/0053—Cooled garments
- A41D13/0056—Cooled garments using evaporative effect
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F7/00—Heating or cooling appliances for medical or therapeutic treatment of the human body
- A61F7/10—Cooling bags, e.g. ice-bags
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
- A62B17/00—Protective clothing affording protection against heat or harmful chemical agents or for use at high altitudes
- A62B17/005—Active or passive body temperature control
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F7/00—Heating or cooling appliances for medical or therapeutic treatment of the human body
- A61F2007/0054—Heating or cooling appliances for medical or therapeutic treatment of the human body with a closed fluid circuit, e.g. hot water
- A61F2007/0056—Heating or cooling appliances for medical or therapeutic treatment of the human body with a closed fluid circuit, e.g. hot water for cooling
- A61F2007/0057—Heating or cooling appliances for medical or therapeutic treatment of the human body with a closed fluid circuit, e.g. hot water for cooling of gas, e.g. air or carbon dioxide
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F7/00—Heating or cooling appliances for medical or therapeutic treatment of the human body
- A61F2007/0059—Heating or cooling appliances for medical or therapeutic treatment of the human body with an open fluid circuit
- A61F2007/0063—Heating or cooling appliances for medical or therapeutic treatment of the human body with an open fluid circuit for cooling
- A61F2007/0064—Heating or cooling appliances for medical or therapeutic treatment of the human body with an open fluid circuit for cooling of gas
- A61F2007/0065—Causing evaporation
- A61F2007/0067—Causing evaporation of sweat
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F7/00—Heating or cooling appliances for medical or therapeutic treatment of the human body
- A61F7/02—Compresses or poultices for effecting heating or cooling
- A61F2007/0292—Compresses or poultices for effecting heating or cooling using latent heat produced or absorbed during phase change of materials, e.g. of super-cooled solutions
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24033—Structurally defined web or sheet [e.g., overall dimension, etc.] including stitching and discrete fastener[s], coating or bond
- Y10T428/24041—Discontinuous or differential coating, impregnation, or bond
Definitions
- the present invention relates to a portable cooling device generally used with body armor systems and which is designed to utilize the body's natural cooling process of convection and the evaporation of sweat and/or other evaporative liquid to provide cooling and comfort to the person wearing the garment while being lightweight, thin, and flexible.
- Body armor systems including vests worn by law enforcement officers, use Kevlar® or similar fibers, which are coated in plastic, as a projectile-resistant shield.
- the plastic coating is necessary to assure the safe performance of the vest, but makes the garment hot and uncomfortable to wear. This, in turn, decreases the mobility and, thus, the efficiency of the officers who wear them and acts as a deterrent to using the body armor and as a result, increases officer casualties.
- Parrish et al U.S. Pat. No. 5,113,666
- a cooling device that can be incorporated into a person's apparel to permit the transfer of water vapor from the wearer's skin.
- Parrish et al (U.S. Pat. No. 5,111,668), a continuation-in-part of U.S. Pat. No. 5,113,666, teach a sealed garment containing a working fluid in an evaporation section of the garment, vaporization occurring by heat generated from the person wearing the garment.
- Parrish et al (U.S. Pat. No. 5,289,695), a divisional of U.S. Pat. No. 5,111,668, teach cooling devices such as vests, pads or patches used in garments, including space suits, sealed hazardous material suits, and/or vests. All of these embodiments comprise of a desiccant layer which is utilized in the storage of the water vapor resulting from the evaporation process. In the present invention, however, the water vapor resulting from the evaporation process is discharged to the environment thus alleviating the requirement of storage and decreasing the weight and size of the cooling apparatus.
- a portable lightweight cooling apparatus for cooling an object comprising some combination of a channeled sheet which absorbs sweat and/or other evaporative liquid, means for moving air through said channeled sheet, and a layer of highly conductive fibers adjacent to said channeled sheet wherein the layer of fibers uniformly distributes heat across the object being cooled, while the air moving within the channeled sheet evaporates sweat and/or other evaporative liquid, absorbs and discharges the heat and moisture generated by the object into the environment.
- a method for removing heat generated by the human body comprising the steps of providing a garment to be placed in thermal communication with the body; potentially placing a layer of conductive fibers within the garment adjacent the body for uniformly distributing the heat generated by the body; removably attaching means for moving air in communication with the garment for forcing air into the garment; potentially including an exchangeable heat sink in communication with the means for moving air in order to precondition the air prior to the air entering the garment or becoming in communication with the layer of highly conductive fibers to transfer heat from the body to the heat sink; and, potentially equipping the garment with a channeled sheet in communication with the air-moving device such that air is directed into the channeled sheet adjacent the layer of fibers so that heat and moisture are expelled from the body by the air being directed out of the channeled sheet and into the environment.
- an apparatus for cooling a living body which apparatus comprises: a layer of thermally conductive material; and a heat sink operably connected to said thermally conductive layer, the apparatus being configured to cause heat from the living body to be conducted through the thermally conductive layer and to the heat sink when the living body is proximate the thermally conductive layer.
- an apparatus for cooling a living body which comprises: a channeled sheet capable of absorbing evaporative liquid; and means for moving air into and through said channeled sheet and communicably connected thereto; said apparatus configured so that when the living body is proximate the channeled sheet the channeled sheet may absorb evaporative liquid from the living body and air moving through said channeled sheet may vaporize the evaporative liquid.
- a method for removing heat generated by a body comprising the steps of: providing an apparatus including a garment, a layer of thermally conductive material disposed within said garment, and a heat sink connected to said thermally conductive material to permit conduction of heat therebetween; and placing the thermally conductive material in contact with at least a portion of the body to cause the thermally conductive material to conduct heat from the body to the heat sink.
- a method for removing heat generated by a body comprising the steps of: providing an apparatus comprising a garment, a channeled sheet for absorbing evaporative liquid disposed within said garment, and a powered air moving device disposed for moving air through channels within said channeled sheet; placing the channeled sheet in contact with at least a portion of the body; and causing the air-moving device to direct air through the channeled sheet and expel air therefrom whereby liquid from the body may be absorbed by the channeled sheet and evaporated to cool the body and whereby heat from the body may be convectively removed by the moving air.
- an apparatus for cooling a living body which comprises: a continuous layer of thermally conductive material wherein a first portion of the continuous layer is configured to be proximate to the living body for absorbing heat from the body and a second portion of said layer is configured to be exposed to ambient air for discharging heat to the ambient air.
- a body armor protective garment for protecting and cooling a living body which comprises a projectile-resisting shield and a continuous layer of thermally conductive material wherein a first portion of the layer is configured to be inside the shield proximate to the living body for absorbing heat from the body, and a second portion of said layer is configured to be outside said shield and exposed to ambient air for discharging heat to the ambient air.
- FIG. 1 is a perspective view of the garment, according to a preferred embodiment of the present invention.
- FIG. 2 is an exploded, perspective view of the garment, according to a preferred embodiment of the present invention.
- FIG. 3 is a top perspective view of the cooling belt, according to a preferred embodiment of the present invention.
- FIG. 4 a is a cross-sectional view of the garment along line A-A as shown in FIG. 2, according to a preferred embodiment of the present invention
- FIG. 4 b is a detailed cross-sectional view of the garment, according to a preferred embodiment of the present invention.
- FIG. 5 is a perspective view of the thermal energy storage (TES) capsule in the cooling belt, according to a preferred embodiment of the present invention.
- TES thermal energy storage
- the present invention is a cooling system integrated into a garment that uses the body's natural capability to cool itself through convection and sweat evaporation.
- the garment cooling system comprises a sheet of hydrophillic material having a plurality of channels formed therein, an air moving device that introduces outside air into the plurality of channels, and a layer that interfaces between the human skin and the channeled sheet to absorb perspiration.
- the garment cooling system comprises a thermal energy storage (TES) capsule that is coupled to carbon fiber fabric.
- TES thermal energy storage
- cooling system will be described in terms of its use as part of a bullet proof vest, it is apparent that the cooling system could be used in fire-proof protective suits, chemical and biological suits, diving suits, hospital blankets, tents and other personal equipment where a means for cooling might be employed.
- a garment having a cooling system according to a preferred embodiment of the present invention is formed in the shape of a vest 20 connected to a belt 30 .
- a vest may be appropriate for certain applications, cooling system could easily be adapted for use in pants, shirts, skirts, hats and other like garments.
- belt 30 has a plurality of openings 32 (FIG. 3) formed therein that are placed in fluid communication with a plurality of channels 22 formed within vest 20 .
- An air moving device 40 such as a mini-fan, blower, impeller or like device, is carried by belt 30 so that air is circulated within plurality of channels 22 .
- Belt 30 and openings 32 therefore serve as a manifold for distributing air to channels.
- Each opening of plurality of openings 32 places air from air moving means 40 in fluid communication with plurality of channels 22 within vest 20 to distribute the flow of air created by air moving device 40 throughout gament 10 .
- air moving device 40 brings air from the outside environment into gament 10 . Air flows close to the skin absorbing both heat and moisture and, thereby, cooling the human body in a way that takes advantage of the natural process of perspiring. The metabolic heat generated by the body is carried out of channels 22 and is exhausted to the outside environment.
- a cooling means 50 which is essentially a heat sink, as will be described in more detail below, is positioned between air moving device 40 and channels 22 to condition the outside air prior to its entering channels 22 .
- Cooling means 50 is used only for partial cooling of outside air in climates where outside air temperature is unacceptably high. Depending upon the particular climate in which garment is being used, cooling means 50 may not be required. In the event use of cooling means is not desired, garment 10 may be designed such that carbon fiber wraps around to the outside of vest and the environment serves as the heat sink. In climates where humidity is high, cooling means 50 may serve as a dehumidifier, extracting moisture from the air during the cooling process via condensation on the cool walls of cooling means 50 or via an absorbing material.
- Cooling means 50 is used only for partial cooling of outside air in climates where outside air temperature is unacceptably high. Depending upon the particular climate in which garment is being used, cooling means 50 may not be required. In the event use of cooling means is not desired, garment 10 may be designed such that carbon fiber wraps around to the outside of vest and the environment serves as the heat sink. In climates where humidity is high, cooling means 50 may serve as a dehumidifier, extracting moisture from the air during the cooling process via condensation on the cool walls of cooling means 50 or via an absorbing material.
- belt 30 is capable of detachment from vest 20 by releasing fastening means 24 .
- Fastening means 24 may comprise a male-type connection or fitting, or other suitable fastening means such as snaps, adhesives and the like, and is hollow to receive air from openings 32 and deliver air to channels 22 .
- Cooling means 50 which is preferably TES material, is placed in belt 30 at openings 32 so that it can remove some heat from incoming air before it enters fastening means 24 and channels 22 . Cooling means 50 serves to lower the temperature of incoming air by a few degrees to take up only part of the heat load.
- vest 20 is formed from a sheet 26 having a plurality of channels 22 , each of which allows the flow of air through garment 10 .
- a protective layer 80 such as a layer of KEVLAR manmade fibers is worn over sheet 26 .
- Channels 22 are preferably formed in a manner that minimizes pressure drop.
- Sheet 26 is preferably formed from a lightweight and flexible hydrophilic materials, such as porous plastics or felted foams, so that sweat, and other evaporative liquids are wicked throughout sheet 26 .
- Sheet 26 may be worn in contact with the skin of the wearer, or, alternatively, may be worn over an undergarment, and the undergarment may be intentionally wetted prior to use or may become wetted by sweat from the user.
- wearing garment 10 “proximate to the body” of its user includes wearing garment in direct contact with the skin or in contact with any garment between the skin and sheet 26 .
- Sheet 26 may be incorporated into a CoolMax® type garment for structural support of channels.
- sheet 26 may be further enhanced by introducing carbon fiber “needles,” or other highly conductive material, into sheet 26 during the molding process.
- the resulting 26 sheet would then be better adapted to wick the sweat, and/or other evaporative liquid, all through channels 22 as well as having a much-improved thermal conductivity so as to be able to redistribute the heat more uniformly throughout vest 20 .
- the combination of carbon fibers and moving air is another important feature of the present invention because the combination is so effective in removing heat from hot areas very efficiently.
- sheet 26 can also be enhanced by the addition of anti-microbial agents, such as those sold under the trademark MICROBAN, incorporated into the material from which it is made. Further, sheet 26 can be enhanced with the addition of phase change material that could preclude the use of cooling means 50 in belt 30 .
- An alternative embodiment of a garment 100 comprising a carbon fiber fabric 120 coupled to a TES material, and then covered with a protective layer 130 such as a layer of KEVLAR manmade fibers.
- This alternative embodiment may be used for applications in which duty cycles are less demanding and where weight is not as much of a factor. In this instance, cooling will depend on conduction and the TES capsule and not on air flow.
- a transition coupling (not shown) between TES capsules and carbon fiber fabric is necessarily provided. This coupling connects the flexible carbon fiber impregnated fabric 120 to the rigid TES capsule and, thus, requires a flexible to semi-rigid to rigid transition.
- Coupling could be an adhesive, having a high thermal conductivity, that secures TES capsules to carbon fiber fabric 120 .
- TES capsule 60 is preferably formed from aluminum or other highly conductive, lightweight material and is preferably located within belt 30 .
- TES capsule will 60 preferably contain a low melting temperature phase change material, for example, ice/water at zero degrees Celsius.
- the phase change material may be any known TES type material which will meet the desired needs of the invention and the conditions of use.
- TES capsule 60 may also have cooling fins 70 made of aluminum, aluminum alloy, or some other highly conductive material for effective heat transfer and light weight.
- TES capsule 60 will serve primarily as a heat sink to cool the incoming outside air from its ambient temperature to a cooler but comfortable temperature prior to entering channels 22 .
- the airflow from air moving device 65 may adjusted manually or adjusted using an automatic integrated control system 55 (FIG. 5).
- Control system 55 is in operational connection with a thermostat (not shown), which controls the air flow of air moving device depending upon the desired temperature.
- Control system 55 is completely analogous to a home thermostat control, which turns on fans in response to an increase in temperature, but may have additional capabilities as well.
- the exposed surface of a TES 60 capsule 60 can be altered to maintain the exit temperature from TES capsule 60 .
- Air-moving device 65 may be operated by lightweight rechargeable batteries, for example, lithium-ion batteries, nickel-cadmium batteries, nickel-metal-hydride batteries, and the like or conventional non-rechargeable batteries.
- Air moving device 65 operates in conjunction with TES 60 because it reduces the amount of TES material needed for cooling and results in a lighter weight garment 10 .
- Prior art systems dump all the heat into a heat sink, and must therefore be sized for the maximum heat load, resulting in a much larger quantity of TES material than the present invention requires.
- TES capsule 60 is only used for part of the load, the remained being taken care of by air moving device 65 .
- the present invention provides a lightweight, thin, flexible, and comfortable cooling garment which is adaptable to the circumstances of the user, and uses the body's natural capabilities to cool itself as a part of the garment's cooling system.
- the invention provides a cooling device for a protective garment which is operable in both sealed and unsealed garments.
- garment may be worn by a user to provide additional cooling.
- air moving means 40 By manually operating air moving means 40 or using controller system to operate air moving means 40 , air will be circulated through channels 22 close to the skin absorbing both heat and moisture, thereby cooling the human body. The metabolic heat generated is carried out of channels 22 and is exhausted to the environment.
Abstract
A portable lightweight cooling apparatus for cooling a human body is disclosed, having a channeled sheet which absorbs sweat and/or evaporative liquid, a layer of highly conductive fibers adjacent the channeled sheet; and, an air-moving device for moving air through the channeled sheet, wherein the layer of fibers redistributes heat uniformly across the object being cooled, while the air moving within the channeled sheet evaporates sweat and/or other evaporative liquid, absorbs evaporated moisture and the uniformly distributed heat generated by the human body, and discharges them into the environment. Also disclosed is a method for removing heat generated by the human body, comprising the steps of providing a garment to be placed in thermal communication with the body; placing a layer of highly conductive fibers within the garment adjacent the body for uniformly distributing the heat generated by the body; attaching an air-moving device in communication with the garment for forcing air into the garment; removably positioning an exchangeable heat sink in communication with the air-moving device for cooling the air prior to the air entering the garment; and, equipping the garment with a channeled sheet in communication with the air-moving device so that air can be directed into the channeled sheet and adjacent the layer of fibers to expell heat and moisture from the body by the air being directed out of the channeled sheet and into the environment. The cooling system may be configured to operate in both sealed and unsealed garments.
Description
- [0001] The U.S. Government has rights in this invention pursuant to contract number DE-AC05-960R22464 between Lockheed Martin Energy Research Corporation and the Department of Energy.
- The present invention relates to a portable cooling device generally used with body armor systems and which is designed to utilize the body's natural cooling process of convection and the evaporation of sweat and/or other evaporative liquid to provide cooling and comfort to the person wearing the garment while being lightweight, thin, and flexible.
- Body armor systems, including vests worn by law enforcement officers, use Kevlar® or similar fibers, which are coated in plastic, as a projectile-resistant shield. The plastic coating is necessary to assure the safe performance of the vest, but makes the garment hot and uncomfortable to wear. This, in turn, decreases the mobility and, thus, the efficiency of the officers who wear them and acts as a deterrent to using the body armor and as a result, increases officer casualties. There have been several attempts to provide a more comfortable protective garment. For example, Parrish et al (U.S. Pat. No. 5,113,666), teach a cooling device that can be incorporated into a person's apparel to permit the transfer of water vapor from the wearer's skin. Parrish et al (U.S. Pat. No. 5,111,668), a continuation-in-part of U.S. Pat. No. 5,113,666, teach a sealed garment containing a working fluid in an evaporation section of the garment, vaporization occurring by heat generated from the person wearing the garment. Parrish et al (U.S. Pat. No. 5,289,695), a divisional of U.S. Pat. No. 5,111,668, teach cooling devices such as vests, pads or patches used in garments, including space suits, sealed hazardous material suits, and/or vests. All of these embodiments comprise of a desiccant layer which is utilized in the storage of the water vapor resulting from the evaporation process. In the present invention, however, the water vapor resulting from the evaporation process is discharged to the environment thus alleviating the requirement of storage and decreasing the weight and size of the cooling apparatus.
- Other examples may also be found in Scaringe et al (U.S. Pat. No. 4,856,294), Szczesuil et al (U.S. Pat. No. 5,320,164), Faghri (U.S. Pat. No. 5,269,369), Garner (U.S. Pat. No. 5,818,693), Koon et al (U.S. Pat. No. 5,898,570), Coulon et al (U.S. Pat. No. 4,852,645), Buckley (U.S. Pat. No. 5,722,482), and Benson (U.S. Pat. No. 4,572,864), which are hereby incorporated by reference.
- These cooling systems, however, remain heavy and uncomfortable to the wearer. Therefore, there remains room in the art for a portable, lightweight, thin, and flexible garment which will provide more comfortable thermal conditions under the armor vest (or similar vest type garments) and would induce people to wear them as necessary, and thereby reduce the occurrence of preventable injuries and fatalities.
- It is an object of the present invention to provide a portable, lightweight, thin, flexible, comfortable and adaptable cooling device generally used in conjunction with a body armor protective garment.
- It is another object of the present invention to provide a cooling device that uses the body's natural capabilities to cool itself by conduction, convection, and/or evaporation as a part of the garment's cooling system.
- It is a further object of the present invention to provide a cooling garment that will make body armor protective garments more likely to be worn by those requiring such protection.
- It is an even further object of the present invention to provide a cooling system operable in both sealed and unsealed garments.
- These and other objects are achieved by a portable lightweight cooling apparatus for cooling an object, comprising some combination of a channeled sheet which absorbs sweat and/or other evaporative liquid, means for moving air through said channeled sheet, and a layer of highly conductive fibers adjacent to said channeled sheet wherein the layer of fibers uniformly distributes heat across the object being cooled, while the air moving within the channeled sheet evaporates sweat and/or other evaporative liquid, absorbs and discharges the heat and moisture generated by the object into the environment.
- These and other objects are also achieved by a method for removing heat generated by the human body, comprising the steps of providing a garment to be placed in thermal communication with the body; potentially placing a layer of conductive fibers within the garment adjacent the body for uniformly distributing the heat generated by the body; removably attaching means for moving air in communication with the garment for forcing air into the garment; potentially including an exchangeable heat sink in communication with the means for moving air in order to precondition the air prior to the air entering the garment or becoming in communication with the layer of highly conductive fibers to transfer heat from the body to the heat sink; and, potentially equipping the garment with a channeled sheet in communication with the air-moving device such that air is directed into the channeled sheet adjacent the layer of fibers so that heat and moisture are expelled from the body by the air being directed out of the channeled sheet and into the environment.
- In accordance with one aspect of the present invention, the foregoing and other objects are achieved by an apparatus for cooling a living body which apparatus comprises: a layer of thermally conductive material; and a heat sink operably connected to said thermally conductive layer, the apparatus being configured to cause heat from the living body to be conducted through the thermally conductive layer and to the heat sink when the living body is proximate the thermally conductive layer.
- In accordance with a second aspect of the present invention, the foregoing and other objects are achieved by an apparatus for cooling a living body which comprises: a channeled sheet capable of absorbing evaporative liquid; and means for moving air into and through said channeled sheet and communicably connected thereto; said apparatus configured so that when the living body is proximate the channeled sheet the channeled sheet may absorb evaporative liquid from the living body and air moving through said channeled sheet may vaporize the evaporative liquid.
- In accordance with a third aspect of the present invention, the foregoing and other objects are achieved by a method for removing heat generated by a body, comprising the steps of: providing an apparatus including a garment, a layer of thermally conductive material disposed within said garment, and a heat sink connected to said thermally conductive material to permit conduction of heat therebetween; and placing the thermally conductive material in contact with at least a portion of the body to cause the thermally conductive material to conduct heat from the body to the heat sink.
- In accordance with a fourth aspect of the present invention, the foregoing and other objects are achieved by a method for removing heat generated by a body, comprising the steps of: providing an apparatus comprising a garment, a channeled sheet for absorbing evaporative liquid disposed within said garment, and a powered air moving device disposed for moving air through channels within said channeled sheet; placing the channeled sheet in contact with at least a portion of the body; and causing the air-moving device to direct air through the channeled sheet and expel air therefrom whereby liquid from the body may be absorbed by the channeled sheet and evaporated to cool the body and whereby heat from the body may be convectively removed by the moving air.
- In accordance with a fifth aspect of the present invention, the foregoing and other objects are achieved by an apparatus for cooling a living body which comprises: a continuous layer of thermally conductive material wherein a first portion of the continuous layer is configured to be proximate to the living body for absorbing heat from the body and a second portion of said layer is configured to be exposed to ambient air for discharging heat to the ambient air.
- In accordance with a sixth aspect of the present invention, the foregoing and other objects are achieved by a body armor protective garment for protecting and cooling a living body which comprises a projectile-resisting shield and a continuous layer of thermally conductive material wherein a first portion of the layer is configured to be inside the shield proximate to the living body for absorbing heat from the body, and a second portion of said layer is configured to be outside said shield and exposed to ambient air for discharging heat to the ambient air.
- In the drawings,
- FIG. 1 is a perspective view of the garment, according to a preferred embodiment of the present invention;
- FIG. 2 is an exploded, perspective view of the garment, according to a preferred embodiment of the present invention;
- FIG. 3 is a top perspective view of the cooling belt, according to a preferred embodiment of the present invention;
- FIG. 4a is a cross-sectional view of the garment along line A-A as shown in FIG. 2, according to a preferred embodiment of the present invention;
- FIG. 4b is a detailed cross-sectional view of the garment, according to a preferred embodiment of the present invention; and
- FIG. 5 is a perspective view of the thermal energy storage (TES) capsule in the cooling belt, according to a preferred embodiment of the present invention.
- The present invention is a cooling system integrated into a garment that uses the body's natural capability to cool itself through convection and sweat evaporation. In a preferred embodiment illustrated in FIGS.1-4 a and 5, the garment cooling system comprises a sheet of hydrophillic material having a plurality of channels formed therein, an air moving device that introduces outside air into the plurality of channels, and a layer that interfaces between the human skin and the channeled sheet to absorb perspiration. In an alternative embodiment illustrated in FIGS. 4b and 5, the garment cooling system comprises a thermal energy storage (TES) capsule that is coupled to carbon fiber fabric. Although the cooling system will be described in terms of its use as part of a bullet proof vest, it is apparent that the cooling system could be used in fire-proof protective suits, chemical and biological suits, diving suits, hospital blankets, tents and other personal equipment where a means for cooling might be employed.
- Referring to FIG. 1, a garment, generally referred to by
reference number 10, having a cooling system according to a preferred embodiment of the present invention is formed in the shape of avest 20 connected to abelt 30. Although it is appreciated that a vest may be appropriate for certain applications, cooling system could easily be adapted for use in pants, shirts, skirts, hats and other like garments. In the vest configuration illustrated in FIG. 1,belt 30 has a plurality of openings 32 (FIG. 3) formed therein that are placed in fluid communication with a plurality ofchannels 22 formed withinvest 20. Anair moving device 40, such as a mini-fan, blower, impeller or like device, is carried bybelt 30 so that air is circulated within plurality ofchannels 22.Belt 30 andopenings 32 therefore serve as a manifold for distributing air to channels. Each opening of plurality ofopenings 32 places air from air moving means 40 in fluid communication with plurality ofchannels 22 withinvest 20 to distribute the flow of air created byair moving device 40 throughoutgament 10. Importantly,air moving device 40 brings air from the outside environment intogament 10. Air flows close to the skin absorbing both heat and moisture and, thereby, cooling the human body in a way that takes advantage of the natural process of perspiring. The metabolic heat generated by the body is carried out ofchannels 22 and is exhausted to the outside environment. - Optionally, a cooling means50, which is essentially a heat sink, as will be described in more detail below, is positioned between
air moving device 40 andchannels 22 to condition the outside air prior to its enteringchannels 22. Cooling means 50 is used only for partial cooling of outside air in climates where outside air temperature is unacceptably high. Depending upon the particular climate in which garment is being used, cooling means 50 may not be required. In the event use of cooling means is not desired,garment 10 may be designed such that carbon fiber wraps around to the outside of vest and the environment serves as the heat sink. In climates where humidity is high, cooling means 50 may serve as a dehumidifier, extracting moisture from the air during the cooling process via condensation on the cool walls of cooling means 50 or via an absorbing material. Cooling means 50 is used only for partial cooling of outside air in climates where outside air temperature is unacceptably high. Depending upon the particular climate in which garment is being used, cooling means 50 may not be required. In the event use of cooling means is not desired,garment 10 may be designed such that carbon fiber wraps around to the outside of vest and the environment serves as the heat sink. In climates where humidity is high, cooling means 50 may serve as a dehumidifier, extracting moisture from the air during the cooling process via condensation on the cool walls of cooling means 50 or via an absorbing material. - Referring to FIGS. 2 and 3,
belt 30 is capable of detachment fromvest 20 by releasing fastening means 24. Fastening means 24 may comprise a male-type connection or fitting, or other suitable fastening means such as snaps, adhesives and the like, and is hollow to receive air fromopenings 32 and deliver air tochannels 22. Cooling means 50, which is preferably TES material, is placed inbelt 30 atopenings 32 so that it can remove some heat from incoming air before it enters fastening means 24 andchannels 22. Cooling means 50 serves to lower the temperature of incoming air by a few degrees to take up only part of the heat load. It will be appreciated by those of ordinary skill in the art that air moving means 40 and cooling means 50 could be incorporated intovest 20, rather than using aseparate belt 30. Referring to FIG. 4A,vest 20 is formed from asheet 26 having a plurality ofchannels 22, each of which allows the flow of air throughgarment 10. Aprotective layer 80, such as a layer of KEVLAR manmade fibers is worn oversheet 26.Channels 22 are preferably formed in a manner that minimizes pressure drop.Sheet 26 is preferably formed from a lightweight and flexible hydrophilic materials, such as porous plastics or felted foams, so that sweat, and other evaporative liquids are wicked throughoutsheet 26.Sheet 26 may be worn in contact with the skin of the wearer, or, alternatively, may be worn over an undergarment, and the undergarment may be intentionally wetted prior to use or may become wetted by sweat from the user. As herein used, wearinggarment 10 “proximate to the body” of its user includes wearing garment in direct contact with the skin or in contact with any garment between the skin andsheet 26.Sheet 26 may be incorporated into a CoolMax® type garment for structural support of channels. - Optionally,
sheet 26 may be further enhanced by introducing carbon fiber “needles,” or other highly conductive material, intosheet 26 during the molding process. The resulting 26 sheet would then be better adapted to wick the sweat, and/or other evaporative liquid, all throughchannels 22 as well as having a much-improved thermal conductivity so as to be able to redistribute the heat more uniformly throughoutvest 20. The combination of carbon fibers and moving air is another important feature of the present invention because the combination is so effective in removing heat from hot areas very efficiently. To prolong the useful life,sheet 26 can also be enhanced by the addition of anti-microbial agents, such as those sold under the trademark MICROBAN, incorporated into the material from which it is made. Further,sheet 26 can be enhanced with the addition of phase change material that could preclude the use of cooling means 50 inbelt 30. - An alternative embodiment of a
garment 100 comprising acarbon fiber fabric 120 coupled to a TES material, and then covered with aprotective layer 130 such as a layer of KEVLAR manmade fibers. This alternative embodiment may be used for applications in which duty cycles are less demanding and where weight is not as much of a factor. In this instance, cooling will depend on conduction and the TES capsule and not on air flow. To ensure adequate operation ofgarment 100, a transition coupling (not shown) between TES capsules and carbon fiber fabric is necessarily provided. This coupling connects the flexible carbon fiber impregnatedfabric 120 to the rigid TES capsule and, thus, requires a flexible to semi-rigid to rigid transition. Although this may be achieved in many possible ways, it is also imperative that the thermal conductivity of this coupling or transition does not impair or impede the conductivity ofgarment 100. Coupling could be an adhesive, having a high thermal conductivity, that secures TES capsules tocarbon fiber fabric 120. - Preferably, air is conditioned prior to being introduced into plurality of
channels 22 using aTES capsule 60, which is best illustrated in FIG. 5.TES capsule 60 is preferably formed from aluminum or other highly conductive, lightweight material and is preferably located withinbelt 30. TES capsule will 60 preferably contain a low melting temperature phase change material, for example, ice/water at zero degrees Celsius. The phase change material, however, may be any known TES type material which will meet the desired needs of the invention and the conditions of use.TES capsule 60 may also havecooling fins 70 made of aluminum, aluminum alloy, or some other highly conductive material for effective heat transfer and light weight.TES capsule 60 will serve primarily as a heat sink to cool the incoming outside air from its ambient temperature to a cooler but comfortable temperature prior to enteringchannels 22. - The airflow from
air moving device 65 may adjusted manually or adjusted using an automatic integrated control system 55 (FIG. 5).Control system 55 is in operational connection with a thermostat (not shown), which controls the air flow of air moving device depending upon the desired temperature.Control system 55 is completely analogous to a home thermostat control, which turns on fans in response to an increase in temperature, but may have additional capabilities as well. For example, in conjunction with the adjustably controlled flow rate, the exposed surface of aTES 60capsule 60 can be altered to maintain the exit temperature fromTES capsule 60. Air-movingdevice 65 may be operated by lightweight rechargeable batteries, for example, lithium-ion batteries, nickel-cadmium batteries, nickel-metal-hydride batteries, and the like or conventional non-rechargeable batteries.Air moving device 65 operates in conjunction withTES 60 because it reduces the amount of TES material needed for cooling and results in alighter weight garment 10. Prior art systems dump all the heat into a heat sink, and must therefore be sized for the maximum heat load, resulting in a much larger quantity of TES material than the present invention requires. Here,TES capsule 60 is only used for part of the load, the remained being taken care of byair moving device 65. - The present invention, thus, provides a lightweight, thin, flexible, and comfortable cooling garment which is adaptable to the circumstances of the user, and uses the body's natural capabilities to cool itself as a part of the garment's cooling system. The invention provides a cooling device for a protective garment which is operable in both sealed and unsealed garments.
- In use, garment may be worn by a user to provide additional cooling. By manually operating air moving means40 or using controller system to operate air moving means 40, air will be circulated through
channels 22 close to the skin absorbing both heat and moisture, thereby cooling the human body. The metabolic heat generated is carried out ofchannels 22 and is exhausted to the environment. - It will be readily understood by those persons skilled in the art that the present invention is susceptible of broad utility and application. Many embodiments and adaptations of the present invention other than those described, as well as many variations, modifications and equivalent arrangements will be apparent from or reasonably suggested by the present invention and foregoing description thereof, without departing from the substance or scope of the present invention as defined by the following appended claims.
Claims (44)
1. An apparatus for cooling a living body comprising:
a layer of thermally conductive material; and
a heat sink operably connected to said thermally conductive layer,
said apparatus configured to cause heat from the living body to be conducted through the thermally conductive material and to the heat sink when the living body is proximate the layer of thermally conductive material.
2. The apparatus of , wherein said thermally conductive material comprises carbon fibers.
claim 1
3. The apparatus of , wherein said heat sink comprises a thermal energy storage device.
claim 1
4. The apparatus of , wherein said thermal energy storage device comprises a thermal storage medium contained within an enclosure.
claim 3
5. The apparatus of , wherein said enclosure comprises a material selected from the group consisting of aluminum and aluminum alloys.
claim 4
6. The apparatus of , wherein said enclosure is thermally conductive and further comprises fins.
claim 4
7. The apparatus of , wherein said thermal energy storage medium comprises water and said enclosure is configured to contain water in liquid phase, solid phase, and combinations thereof.
claim 4
8. The apparatus of , wherein said heat sink is removably connected.
claim 1
9. The apparatus of , further comprising a garment for supporting said layer of thermally conductive material proximate the living body.
claim 1
10. The apparatus of , further comprising an interface between said thermally conductive material and said heat sink.
claim 1
11. The apparatus of , wherein said interface comprises a thermally conductive flexible to semi-rigid to rigid transition coupling.
claim 10
12. An apparatus for cooling a living body, comprising:
a channeled sheet capable of absorbing evaporative liquid; and,
a means for moving air into and through said channeled sheet and communicably connected thereto,
wherein said apparatus is configured so that when the living body is proximate the channeled sheet the channeled sheet may absorb evaporative liquid from the living body and air moving through said channeled sheet will aid in removing the evaporated liquid.
13. The apparatus of , wherein said channeled sheet comprises a plurality of tubular channels.
claim 12
14. The apparatus of , wherein said channeled sheet comprises at least one material selected from the group consisting of polyethylene, polypropylene, ethylene vinyl acetate, and polyurethane.
claim 12
15. The apparatus of , wherein said channeled sheet is impregnated with at least one material selected from the group consisting of carbon fiber needles and phase change materials.
claim 12
16. The apparatus of , wherein said channeled sheet has at least one property selected from the group consisting of hydrophilic and anti-microbial.
claim 12
17. The apparatus of , wherein said means for moving air is selected from the group comprising a fan, blower, impeller, and natural convection.
claim 12
18. The apparatus of , wherein said means for moving air is manually controlled.
claim 12
19. The apparatus of , wherein said means for moving air comprises a controller having at least one sensor selected from the group consisting of temperature sensor, relative humidity sensor, and wet-bulb temperature sensor.
claim 12
20. The apparatus of , further comprising a garment for supporting said channeled sheet proximate the living body.
claim 12
21. The apparatus of , further comprising an air conduit disposed between said garment and said means for moving air.
claim 20
22. The apparatus of , wherein said air conduit comprises at least one tube.
claim 21
23. The apparatus of further comprising an electric power supply, said means for moving air connected to and driven by said electric power supply.
claim 12
24. The apparatus of , wherein said electrical power supply further comprises at least one battery selected from the group consisting of lithium-ion battery, nickel-cadmium battery, nickel-metal-hydride battery, sealed lead acid battery, and alkaline battery.
claim 23
25. The apparatus of , further comprising a heat sink disposed in communication with said means for moving air for preconditioning the air propelled by said means for moving air.
claim 12
26. The apparatus of , wherein said heat sink comprises a thermal energy storage device.
claim 25
27. The apparatus of , wherein said thermal energy storage device comprises an energy storage medium contained within an enclosure.
claim 25
28. The apparatus of , wherein said enclosure comprises a material selected from the group consisting of aluminum and aluminum alloys.
claim 27
29. The apparatus of , wherein said enclosure is thermally conductive and further comprises fins.
claim 28
30. The apparatus of , wherein said thermal energy storage medium comprises water and said enclosure is configured to contain water in liquid phase, solid phase, and a combination thereof.
claim 27
31. The apparatus of , wherein said heat sink is removably connected.
claim 25
32. The apparatus of , further comprising a means for dehumidifying the air moved through said channeled sheet communicably connected to said means for moving air.
claim 12
33. The apparatus of , further comprising a layer of thermally conductive material configured to be disposed between said channeled sheet and the living body to conduct heat across the living body.
claim 12
34. The apparatus of , wherein said layer of thermally conductive material comprises carbon fibers.
claim 33
35. A method for removing heat generated by a body, comprising the steps of:
providing an apparatus comprising a garment, a layer of thermally conductive material disposed within said garment, and a heat sink connected to said thermally conductive material to permit conduction of heat therebetween; and
placing the thermally conductive material proximate at least a portion of the body to cause the thermally conductive material to conduct heat from the body to the heat sink.
36. A method for removing heat generated by a body, comprising the steps of:
providing an apparatus comprising a garment, a channeled sheet for absorbing evaporative liquid disposed within said garment, and a means for moving air through channels within said channeled sheet;
placing the channeled sheet in contact with at least a portion of the body; and
causing the air-moving device to direct air through the channeled sheet and expel air therefrom whereby liquid from the body may be absorbed by the channeled sheet and evaporated to evaporatively cool the body and heat from the body is convectively removed by the moving air.
37. The method of wherein the apparatus further comprises a heat sink disposed in communication with said air moving device for preconditioning the air moving therethrough.
claim 36
38. The method of wherein the apparatus further comprises a layer of conductive material which distributes heat across the body and channel sheet disposed in surface contact between said channeled sheet and at least a portion of the body.
claim 36
39. An apparatus for cooling a living body, said apparatus comprising:
a continuous layer of thermally conductive material having a first portion and a second portion wherein said first portion of said layer is configured to be proximate the living body for absorbing heat from the living body and said second portion of said layer is configured to be exposed to ambient air for discharging heat to the ambient air.
40. The apparatus as recited in , wherein said layer of thermally conductive material comprises carbon fibers.
claim 39
41. A body armor protective garment for protecting and cooling a living body, said garment comprising:
a projectile-resisting shield; and
a continuous layer of thermally conductive material having a first portion that is configured to be inside said projectile-resisting shield proximate the living body for absorbing heat from the living body and a second portion of said layer that is configured to be outside said projectile-resisting shield and exposed to ambient air for discharging heat to the ambient air.
42. A body armor protective garment for protecting and cooling a living body comprising:
a projectile-resisting shield; and
a first layer of thermally conductive material configured to be inside said projectile-resisting shield proximate the living body for absorbing heat from the living body and a second layer of thermally conductive material configured to be outside said projectile-resisting shield and exposed to ambient air for discharging heat to the ambient air; and
thermally conductive connecting fibers, said thermally conductive connecting fibers passing through said projectile-resisting shield and being thermally connected to said first layer and said second layer.
43. The body armor protective garment as recited in , wherein said layer of thermally conductive material comprises carbon fibers.
claim 41
44. The body armor protective garment as recited in , wherein said layer of thermally conductive material comprises carbon fibers.
claim 42
Priority Applications (1)
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Also Published As
Publication number | Publication date |
---|---|
US6295648B2 (en) | 2001-10-02 |
US6257011B1 (en) | 2001-07-10 |
US6276155B2 (en) | 2001-08-21 |
US20010000849A1 (en) | 2001-05-10 |
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