US20090120111A1 - Remote Diagnostics and Prognostics for Refrigerant Systems - Google Patents
Remote Diagnostics and Prognostics for Refrigerant Systems Download PDFInfo
- Publication number
- US20090120111A1 US20090120111A1 US12/083,790 US8379008A US2009120111A1 US 20090120111 A1 US20090120111 A1 US 20090120111A1 US 8379008 A US8379008 A US 8379008A US 2009120111 A1 US2009120111 A1 US 2009120111A1
- Authority
- US
- United States
- Prior art keywords
- components
- refrigerant system
- controller
- operational parameters
- transducer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/005—Arrangement or mounting of control or safety devices of safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/11—Fan speed control
- F25B2600/111—Fan speed control of condenser fans
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/11—Fan speed control
- F25B2600/112—Fan speed control of evaporator fans
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/19—Pressures
- F25B2700/193—Pressures of the compressor
- F25B2700/1931—Discharge pressures
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/19—Pressures
- F25B2700/193—Pressures of the compressor
- F25B2700/1933—Suction pressures
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2115—Temperatures of a compressor or the drive means therefor
- F25B2700/21151—Temperatures of a compressor or the drive means therefor at the suction side of the compressor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2115—Temperatures of a compressor or the drive means therefor
- F25B2700/21152—Temperatures of a compressor or the drive means therefor at the discharge side of the compressor
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- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
There is provided a refrigerant system including a plurality of components for regulating operational parameters of the refrigerant system, at least one transducer connected to the refrigerant system for monitoring the operational parameters of the refrigerant system, and a controller. The controller is remotely connected to the at least one transducer and to at least one component of the plurality of components for at least periodically receiving parameter information from the at least one transducer to monitor the operational parameters and determine, based on variations in at least one parameter of the operational parameters, whether a condition exists in the refrigerant system that requires corrective action. The corrective action may include moving the refrigerant system to a lighter mode of operation by unloading or even shutting down some of the refrigerant system components. There is also provided a method for monitoring the refrigerant system.
Description
- 1. Field of the Invention
- The present invention relates to diagnostic systems and methods, and more particularly, to diagnostic systems and methods in refrigerant systems established via a remote connection.
- 2. Description of the Related Art
- While complexity of refrigerant systems is continuously increasing, troubleshooting and maintenance (both required and preventive) have become extremely time-consuming and expensive. These activities are closely related to the need for reliable diagnostic and prognostic techniques. Nowadays, most troubleshooting and maintenance are performed by technicians or mechanics on a job site and frequently require a number of iterations, since the root cause of a problem is not known prior to their visits. Furthermore, preventive maintenance intervals, although representing good business practice, may not need to be performed as often as scheduled, and their frequency ideally should vary in accordance with application severity and operation environment harshness.
- Therefore, there is a need for a diagnostic and prognostic system and method that will increase efficiency of troubleshooting and maintenance, and consequently reduce troubleshooting and maintenance expense as well as refrigerant equipment downtime and customer discomfort.
- There is provided a refrigerant system including a plurality of components for regulating operational parameters of the refrigerant system, at least one transducer connected to the refrigerant system for monitoring the operational parameters of the refrigerant system, and a controller. The controller is remotely connected to the at least one transducer and to at least one component of the plurality of components, for at least periodically receiving operational parameter information from the at least one transducer to monitor the operational parameters and determine, based on variations in at least one parameter of the operational parameters, whether a condition exists in the refrigerant system that requires corrective action.
- In one embodiment, the controller is remotely connected to the at least one transducer and at least one component of the refrigerant system via a local system controller. The controller controls said local system controller to monitor and operate the refrigerant system.
- There is also provided a method for monitoring a refrigerant system. The method includes detecting operational parameters of the refrigerant system at least periodically, and during an operation of the refrigerant system, via at least one transducer connected to the refrigerant system. The method further includes receiving parameter information from the at least one transducer to monitor the operational parameters via a controller remotely connected to the at least one transducer and at least one component of a plurality of components. The method also includes determining, based on variations in at least one parameter of the operational parameters, whether a condition exists in the refrigerant system that requires corrective action.
-
FIG. 1 shows a refrigerant system including a monitoring system according to the present invention. -
FIG. 1 shows arefrigerant system 100 including amonitoring system 105 according to the present invention.Refrigerant system 100 includesrefrigerant lines 110, and a plurality of components for regulating operational parameters ofrefrigerant system 100, including condenser andevaporator heat exchangers 115 associated with corresponding outdoor andindoor fans 145,expansion device 120,compressor 125, and discharge, suction and bypass flow control devices such asvalves 140. The schematic presented inFIG. 1 is purely exemplary; there are many possible configurations and variations of the design ofrefrigerant system 100 that are not shown but fall within the scope of the invention. -
Monitoring system 105 includes aremote controller 150, connected torefrigerant system 100.Controller 150 is connected totransducers 135 and to at least one of the plurality ofcomponents including fans 145, expansion device, e.g.,valve 120,compressor 125, andvalves 140.Transducers 135 may be temperature or pressure transducers, and are connected torefrigerant system 100 at various location points, for example, atlines 110 for simplicity of installation. In one embodiment,remote controller 150 is indirectly connected torefrigerant system 100 via an optionallocal system controller 130, which is directly connected totransducers 135 and to at least one of the plurality of components. - In one embodiment,
remote controller 150 is connected totransducers 135, for monitoringrefrigerant system 100, and to at leastcompressor 125 and/orvalves 140.Remote controller 150 receives signals fromtransducers 135, translates the signals into parameter information, and controls components ofrefrigerant system 100 andmonitoring system 105, such astransducers 135,compressor 125 andvalves 140.Remote controller 150 may also provide information to a user regarding observed parameters and the status of various components. -
Remote controller 150 preferably includes a computing platform, such as a personal computer, a mainframe computer, or any other type of computing platform that may be provisioned with a memory device (not shown), a CPU or microprocessor device (not shown), and several I/O ports (not shown).Remote controller 150 may also include a display or other device for providing information, a visual or audio indicator to identify a malfunctioning component.Remote controller 150 may also include an interface allowing a user to set operating parameters and control components ofrefrigerant system 100 and/ormonitoring system 105. -
Remote controller 150 is remotely connected torefrigerant system 100. In one embodiment,remote controller 150 is connected totransducers 135,compressor 125, and/or other components ofrefrigerant system 100. Controller may be directly connected torefrigerant system 100 over a remote connection or a network, such as the Internet, an intranet, or a local area network. In another embodiment,remote controller 150 is remotely connected torefrigerant system 100 vialocal system controller 130, which is directly connected totransducers 135 and other components ofrefrigerant system 100. - In another embodiment,
local system controller 130 is directly connected totransducers 135,compressor 125, and/or other components ofrefrigerant system 100.Local system controller 130 may be hard wired to the system components.Remote controller 150 is connected tolocal system controller 130 over a remote connection or a network, such as the Internet, an Intranet, or a local area network. In this embodiment,remote controller 150 operateslocal system controller 130 to monitor and controlrefrigerant system 100. -
Remote controller 150 collects and processes operational parameter information ofrefrigerant system 100 in real time, preferably during normal operation ofrefrigerant system 100, for diagnosis and/or prognosis of potentially malfunctioning or degrading components ofrefrigerant system 100.Remote controller 150 collects parameter information by receiving signals from at least one oftransducers 135, to monitor said operational parameters, and determines whether a condition exists in said refrigerant system that requires corrective action. In one embodiment,remote controller 150 receives parameterinformation form transducers 135 vialocal system controller 130.Remote controller 150 determines whether a condition requiring corrective action exists based on variations in at least one parameter of said operational parameters.Remote controller 150 collects parameter information periodically or when problems arise.Remote controller 150 may also collect parameter information fromtransducers 135 continuously during operation ofrefrigerant system 100. -
Remote controller 150 performs a diagnostic function by determining whether a condition exists that requires corrective action. In one embodiment,remote controller 150 displays parameter information to a user, who then determines whether a condition requiring corrective action exists. Such a condition may be a potential malfunction of one or more of the components, such asvalves 140, and/or a degradation of the operation ofrefrigerant system 100 caused by one or more of said components. -
Remote controller 150 may determine whether a component is malfunctioning, or potentially malfunctioning, by remotely switching at least one of the components from a first operating state to a second operating state, observing a variation in an operational parameter resulting from the switching, comparing the observed variation with an expected variation due to the switching, and detecting a difference or a substantial difference between the observed variation and the expected variation. In one embodiment, a tolerance value, or minimum difference between the observed variation and the expected variation can be set, so that any difference greater than the tolerance value will trigger a malfunction determination. - In the instance of valve components,
remote controller 150 switches valves such asvalves valves valves valves valves -
Remote controller 150 may detect a degradation of operation ofrefrigerant system 100 by remotely observing a change in related operational parameters over a period of time. Examples of components that could cause degradation include air filters, which can become dirty or clogged, and condenser/evaporator coils 115, which can become clogged, rusted or accidentally blocked. In this embodiment, the system is a prognostic system, because although there is no actual malfunction, the degradation in operational parameters indicates that a problem is developing. The system can then generate a response to address such a developing problem before it detrimentally affects reliability ofrefrigerant system 100 or significantly affects its operation. For instance,refrigerant system 100 may be moved byremote controller 150 to a lighter (less loaded) mode of operation to prevent component breakdown or failure. - In circumstances where operation of
refrigerant system 100 is monitored over a prolonged period of time, prognostic methodology can be employed. Degradation of operational parameters can be monitored over a period of time, so that predictions can be made with high confidence as to when preventive maintenance must be performed for a particular system installation. - When
remote controller 150 determines that a condition requiring corrective action exists,remote controller 150 may generate a response. The response may include generating a warning signal indicating that the condition exists. The warning signal may be displayed to an end user. The response may also include generating a repair or maintenance request, which can be relayed to a repair center or other location by which a repair technician is alerted. The signal and the repair or maintenance request include an identification of one or more of the components that are causing said condition. Thus, information regarding the root cause of a malfunction accompanies the repair request, allowing a technician to more efficiently address the malfunction and thus more quickly complete repairs. - In another embodiment, the response includes remotely controlling at least one of the components to alter the operational parameters to remedy the condition and/or avoid further damage to
refrigerant system 100. - On some occasions, for example, when a condition requiring corrective action exists but the condition cannot be addressed or a technician cannot get to the unit in a reasonable time,
remote controller 150 can control at least one of the components to operaterefrigerant system 100 in a light mode, i.e., a lighter or less loaded mode of operation, while providing continuous monitoring of its operation. In this instance,remote controller 150 performs sequential unloading steps. For example, if a potential problem is associated withcompressor 125, thenremote controller 150 can runrefrigerant system 100 in the bypass mode or at reduced speed. In another example, if the problem is associated with one offans 145,remote controller 150 can reduce the speed of one or more of thefans 145. This will preventrefrigerant system 100 downtime and will provide some, although potentially reduced, comfort to the end user. If a sequence of lighter modes of operation proves insufficient to reduce or temporarily eliminate the condition or malfunction,remote controller 150 can shut down one or more of the components and/or shut downrefrigerant system 100 completely. Shutting downrefrigerant system 100 completely should be a last resort and when all other possible measures are exhausted. - The method for monitoring a refrigerant system includes detecting operational parameters of
refrigerant system 100 at least periodically and during an operation ofrefrigerant system 100, receiving parameter information from at least onetransducer 135 viaremote controller 150, and determining, based on variations in at least one operational parameter, whether a condition exists inrefrigerant system 100 that requires corrective action. - In another embodiment, the operational parameters are continuously detected and parameter information is continuously received.
- In yet another embodiment, the step of determining whether the potential malfunction, i.e., condition requiring corrective action, exists includes switching at least one component of the plurality of components from a first operating state to a second operating state, observing a variation in an operational parameter resulting from the switching, comparing the observed variation with an expected variation due to the switching, and detecting a substantial difference between the observed variation and the expected variation. In yet another embodiment, the step of determining whether the degradation exists includes detecting degradation in the operational parameters over a period of time.
- In still another embodiment, the method includes generating a response if the condition exists. The response may include generating a signal indicating that the condition exists, generating a repair or maintenance request, and/or remotely controlling at least one of the plurality of components to alter operational parameters to remedy the condition and/or avoid further damage to
refrigerant system 100. In still another embodiment, the signal and the repair or maintenance request include an identification of one or more of the plurality of components that are causing the condition. - In another embodiment, controlling at least one of the plurality of components includes operating
refrigerant system 100 in a light mode (e.g., unloaded mode), shutting down one or more of the plurality of components, and/or shutting downrefrigerant system 100. - Thus, in a number of circumstances, the system and method of the present invention will significantly reduce the expense of troubleshooting and maintenance as well as refrigerant system downtime and customer discomfort. The system and method has an additional advantage in that it requires only control logic modifications and requires no hardware change or addition.
- It should be understood that various alternatives, combinations and modifications of the teachings described herein could be devised by those skilled in the art. The present invention is intended to embrace all such alternatives, modifications and variances that fall within the scope of the appended claims.
Claims (20)
1. A method for monitoring a refrigerant system, comprising the steps of:
detecting operational parameters of said refrigerant system at least periodically, and during an operation of said refrigerant system, via at least one transducer connected to said refrigerant system;
receiving parameter information, to monitor said operational parameters, from said at least one transducer via a controller remotely connected to said at least one transducer and to at least one component of a plurality of components;
determining, based on variations in at least one parameter of said operational parameters, whether a condition exists in said refrigerant system that requires corrective action; and
remotely controlling at least one of said plurality of components to operate said refrigerant system in a light mode.
2. The method of claim 1 , wherein controller is remotely connected to said at least one transducer via a local system controller, and wherein said controller controls said local system controller to operate and monitor said refrigerant system.
3. The method of claim 1 , wherein said controller is connected to said at least one transducer through the Internet.
4. The method of claim 1 , wherein said operational parameters are continuously detected and parameter information is continuously received.
5. The method of claim 1 , wherein said condition is selected from the group consisting of the following:
a potential malfunction of one or more of said components
a degradation of system operation caused by one or more of said components, and
a combination thereof.
6. The method of claim 5 , wherein said step of determining whether said potential malfunction exists includes switching at least one component of said plurality of components from a first operating state to a second operating state, observing a variation in an operational parameter resulting from said switching, comparing said observed variation with an expected variation due to said switching, and detecting a substantial difference between said observed variation and said expected variation.
7. The method of claim 5 , wherein said step of determining whether said degradation exists includes detecting degradation in said operational parameters over a period of time.
8. The method of claim 1 , comprising the further step of generating a response if said condition exists, wherein said response is selected from the group consisting of:
generating a signal indicating that said condition exists,
generating a repair or maintenance request,
remotely controlling at least one of said plurality of components to alter operational parameters to perform at least one of a function selected from the group consisting of remedying said condition and avoiding further damage to said refrigerant system, and
any combinations thereof.
9. The method of claim 8 , wherein said signal and said repair or maintenance request include an identification of one or more of said plurality of components that are causing said condition.
10. The method of claim 8 , wherein said controlling at least one of said plurality of components includes at least one action selected from the group consisting of:
shutting down one or more of said plurality of components, and
shutting down said refrigerant system.
11. A refrigerant system comprising:
a plurality of components for regulating operational parameters of said refrigerant system;
at least one transducer connected to said refrigerant system for monitoring said operational parameters of said refrigerant system;
a controller remotely connected to said at least one transducer and to at least one component of said plurality of components for at least periodically receiving parameter information from said at least one transducer to monitor said operational parameters and determine, based on variations in at least one parameter of said operational parameters, whether a condition exists in said refrigerant system that requires corrective action and remotely controlling at least one of said plurality of components to operate said refrigerant system in a light mode.
12. The system of claim 11 , wherein controller is remotely connected to said at least one transducer via a local system controller, and wherein said controller controls said local system controller to operate and monitor said refrigerant system.
13. The system of claim 11 , wherein said controller is connected to said at least one transducer through the Internet.
14. The system of claim 11 , wherein said condition is selected from the group consisting of the following:
a potential malfunction of one or more of said components,
a degradation of refrigerant system operation caused by one or more of said components, and
a combination thereof.
15. The system of claim 14 , wherein said controller detects a potential malfunction by switching at least one component of said plurality of components from a first operating state to a second operating state, observing a variation in an operational parameter resulting from said switching, comparing said observed variation with an expected variation due to said switching, and detecting a substantial difference between said observed variation and said expected variation.
16. The system of claim 14 , wherein said controller detects a degradation of system operation by detecting degradation in said operational parameters over a period of time.
17. The system of claim 11 , wherein said controller generates a response if said condition exists, wherein said response is selected from the group consisting of:
generating a signal indicating that said condition exists,
generating a repair or maintenance request,
remotely controlling at least one of said plurality of components to alter said operational parameters to perform at least one of a function selected from the group consisting of remedying said condition and avoiding further damage to said refrigerant system,
and any combinations thereof.
18. The system of claim 17 , wherein said signal and said repair or maintenance request include an identification of one or more of said plurality of components that are causing said condition.
19. The system of claim 17 , wherein said controlling at least one of said plurality of components includes at least one action selected from the group consisting of:
shutting down one or more of said plurality of components, and
shutting down said refrigerant system.
20. (canceled)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/US2005/037336 WO2007046791A1 (en) | 2005-10-18 | 2005-10-18 | Remote diagnostics and prognostics for refrigerant systems |
Publications (1)
Publication Number | Publication Date |
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US20090120111A1 true US20090120111A1 (en) | 2009-05-14 |
Family
ID=37962787
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US12/083,790 Abandoned US20090120111A1 (en) | 2005-10-18 | 2005-10-18 | Remote Diagnostics and Prognostics for Refrigerant Systems |
Country Status (5)
Country | Link |
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US (1) | US20090120111A1 (en) |
EP (1) | EP1946021A4 (en) |
CN (1) | CN101326415B (en) |
HK (1) | HK1127516A1 (en) |
WO (1) | WO2007046791A1 (en) |
Cited By (11)
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US20100204838A1 (en) * | 2009-02-12 | 2010-08-12 | Liebert Corporation | Energy efficient air conditioning system and method utilizing variable capacity compressor and sensible heat ratio load matching |
US20100281894A1 (en) * | 2008-01-17 | 2010-11-11 | Carrier Corporation | Capacity modulation of refrigerant vapor compression system |
US9175872B2 (en) | 2011-10-06 | 2015-11-03 | Lennox Industries Inc. | ERV global pressure demand control ventilation mode |
US9395097B2 (en) | 2011-10-17 | 2016-07-19 | Lennox Industries Inc. | Layout for an energy recovery ventilator system |
US9404668B2 (en) | 2011-10-06 | 2016-08-02 | Lennox Industries Inc. | Detecting and correcting enthalpy wheel failure modes |
US9441843B2 (en) | 2011-10-17 | 2016-09-13 | Lennox Industries Inc. | Transition module for an energy recovery ventilator unit |
US9671122B2 (en) | 2011-12-14 | 2017-06-06 | Lennox Industries Inc. | Controller employing feedback data for a multi-strike method of operating an HVAC system and monitoring components thereof and an HVAC system employing the controller |
US9835353B2 (en) | 2011-10-17 | 2017-12-05 | Lennox Industries Inc. | Energy recovery ventilator unit with offset and overlapping enthalpy wheels |
US20180135902A1 (en) * | 2016-11-15 | 2018-05-17 | Fuji Electric Co., Ltd. | Refrigerant circuit device |
US9977409B2 (en) | 2011-03-02 | 2018-05-22 | Carrier Corporation | SPC fault detection and diagnostics algorithm |
WO2023220788A1 (en) * | 2022-05-20 | 2023-11-23 | Hussmann Australia Pty Ltd | Refrigeration network monitoring system and device |
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2005
- 2005-10-18 US US12/083,790 patent/US20090120111A1/en not_active Abandoned
- 2005-10-18 CN CN2005800522941A patent/CN101326415B/en not_active Expired - Fee Related
- 2005-10-18 EP EP05808845A patent/EP1946021A4/en not_active Withdrawn
- 2005-10-18 WO PCT/US2005/037336 patent/WO2007046791A1/en active Application Filing
-
2009
- 2009-06-10 HK HK09105222.0A patent/HK1127516A1/en not_active IP Right Cessation
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Also Published As
Publication number | Publication date |
---|---|
WO2007046791A1 (en) | 2007-04-26 |
EP1946021A4 (en) | 2012-07-11 |
HK1127516A1 (en) | 2009-09-25 |
CN101326415A (en) | 2008-12-17 |
CN101326415B (en) | 2010-06-16 |
EP1946021A1 (en) | 2008-07-23 |
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