DK2639516T3 - WATER BASED HEAT PUMP HEATING DEVICE - Google Patents
WATER BASED HEAT PUMP HEATING DEVICE Download PDFInfo
- Publication number
- DK2639516T3 DK2639516T3 DK13158797.4T DK13158797T DK2639516T3 DK 2639516 T3 DK2639516 T3 DK 2639516T3 DK 13158797 T DK13158797 T DK 13158797T DK 2639516 T3 DK2639516 T3 DK 2639516T3
- Authority
- DK
- Denmark
- Prior art keywords
- refrigerant
- compressor
- water
- heat pump
- pressure
- Prior art date
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims description 46
- 238000010438 heat treatment Methods 0.000 title claims description 19
- 239000003507 refrigerant Substances 0.000 claims description 78
- 238000001816 cooling Methods 0.000 claims description 16
- 238000001514 detection method Methods 0.000 claims description 6
- 238000013021 overheating Methods 0.000 claims 2
- 238000005057 refrigeration Methods 0.000 description 18
- 230000005856 abnormality Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 230000005494 condensation Effects 0.000 description 5
- 238000009833 condensation Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000008236 heating water Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1066—Arrangement or mounting of control or safety devices for water heating systems for the combination of central heating and domestic hot water
- F24D19/1072—Arrangement or mounting of control or safety devices for water heating systems for the combination of central heating and domestic hot water the system uses a heat pump
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
- F24D19/1039—Arrangement or mounting of control or safety devices for water heating systems for central heating the system uses a heat pump
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
- F24H15/375—Control of heat pumps
- F24H15/38—Control of compressors of heat pumps
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
- Steam Or Hot-Water Central Heating Systems (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
- Air Conditioning Control Device (AREA)
Description
DESCRIPTION
[Technical Field] [0001] The present invention relates to a heat pump hydronic heater.
[Background Technique] [0002] Conventionally, heaters using combustible fuel such as oil (petroleum) or gas are frequently utilized but in recent years, heaters utilizing a heat pump technique are abruptly increasing.
[0003] Fig. 3 is a block diagram of a conventional heat pump hydronic heater which can cool and heat. As shown in Fig. 3, the conventional heat pump hydronic heater includes a refrigeration cycle which is formed by annularly connecting a compressor 1, a four-way valve 2, a water-refrigerant heat exchanger 3, a decompressor 4 and an outdoor heat exchanger 5 to one another through a refrigerant pipe 7. The outdoor heat exchanger 5 includes a blast fan 6 for accelerating heat exchange between air and a refrigerant.
[0004] The heat pump hydronic heater also includes a water pump 8 for sending, to a cooling/heating terminal 20, cold water or hot water produced by the water-refrigerant heat exchanger 3. The heat pump hydronic heater carries out a heating operation (or hot water supplying operation) or a cooling operation by switching the four-way valve 2. When the heating operation (or hot water supplying operation) is carried out, the water-refrigerant heat exchanger 3 is used as a condenser, and when the cooling operation is carried out, the water-refrigerant heat exchanger 3 is used as an evaporator (see patent document 1 for example). Patent document 2 forming the closest prior art discloses a refrigeration system wherein a low refrigerant charge in said refrigeration system is detected by monitoring the compressor discharge pressure and temperature. This monitoring is accomplished with a combined pressure/temperature sensor located at or near the compressor outlet. The sensor output signals are fed to a controller which produces a low charge signal whenever a combination of high discharge temperature and a low discharge pressure is detected. The controller can optionally receive input of additional operating characteristics of the refrigeration system to provide a more accurate low charge signal. The controller is connected to an indicator and/or the compressor so that the low charge signal activates the indicator and/or deactivates the compressor.
[Prior Art Document] [Patent Document] [0005] [Patent Document 1] Japanese Patent Application Laid-open No.2011-47607 [Patent Document 2] US Patent 5,586,445 [Summary of the Invention] [Problem to be Solved by the Invention] [0006] However, in the case of a separate type heat pump hydronic heater in which a heat exchange unit accommodating the water-refrigerant heat exchanger 3 therein, and a heat pump unit accommodating the compressor 1 and the outdoor heat exchanger 5 therein are disposed indoors and outdoors, respectively, a length of a pipe through which the heat exchange unit and the heat pump unit are connected to each other is not constant depending upon installation conditions. Therefore, it is difficult to precisely determine a temperature range when the evaporator is operated, and leakage of a refrigerant is erroneously detected.
[0007] The present invention has been accomplished to solve the conventional problem, and it is an object of the invention to provide a heat pump hydronic heater having improved usability in which leakage of a refrigerant is not erroneously detected.
[Means for Solving the Problems] [0008] To solve the conventional problem, the present invention provides a heat pump hydronic heater as defined in claim 1. In particular, the heat pump hydronic heater includes a refrigeration cycle formed by connecting, to one another through a refrigerant pipe, a compressor which compresses a refrigerant, a water-refrigerant heat exchanger which heat-exchanges between the refrigerant and water, a decompressor which decompresses the refrigerant and an outdoor heat exchanger which heat-exchanges between the refrigerant and air, wherein the heat pump hydronic heater comprises discharge pressure detecting means which detects a pressure of the refrigerant discharged from the compressor, discharge superheat degree detecting means which detects a superheat degree of the refrigerant discharged from the compressor, and a control device, and the control device stops operation of the compressor if the discharge pressure detected by the discharge pressure detecting means is lower than a first set pressure and a discharge superheat degree detected by the discharge superheat degree detecting means is equal to or higher than a predetermined value when predetermined time is elapsed after the compressor is started, or if the discharge pressure detected by the discharge pressure detecting means is lower than a second set pressure which is set lower than the first set pressure.
[0009] According to this configuration, since the heat pump hydronic heater can accept various lengths of various pipes, it is possible to completely detect leakage of a refrigerant, and it is possible to provide the heat pump hydronic heater having improved usability.
[Effect of the invention] [0010] According to the present invention, it is possible to provide a heat pump hydronic heater having improved usability in which leakage of a refrigerant is not erroneously detected.
[Brief Description of the Drawings] [0011]
Fig. 1 is a block diagram of a heat pump hydronic heater according to an embodiment of the present invention;
Fig. 2 is a flowchart of refrigerant leakage detection control of the heat pump hydronic heater; and
Fig. 3 is a block diagram of a conventional heat pump hydronic heater.
[Explanation of Symbols] [0012] 1 compressor 1a discharge temperature sensor 1b discharge pressure sensor (discharge pressure detecting means) 2 four-way valve 3 water-refrigerant heat exchanger 4 decompressor 5 outdoor heat exchanger 6 blast fan 8 water pump 10a heat pump unit 10b heat exchange unit 11a control device (heat pump unit control device) 11b control device (heat exchange unit control device) [Mode for Carrying Out the Invention] [0013] A first aspect of the invention provides a heat pump hydronic heater including a refrigeration cycle formed by connecting, to one another through a refrigerant pipe, a compressor which compresses a refrigerant, a water-refrigerant heat exchanger which heat-exchanges between the refrigerant and water, a decompressor which decompresses the refrigerant and an outdoor heat exchanger which heat-exchanges between the refrigerant and air, wherein the heat pump hydronic heater comprises discharge pressure detecting means which detects a pressure of the refrigerant discharged from the compressor, discharge superheat degree detecting means which detects a superheat degree of the refrigerant discharged from the compressor, and a control device, and the control device stops operation of the compressor if the discharge pressure detected by the discharge pressure detecting means is lower than a first set pressure and a discharge superheat degree detected by the discharge superheat degree detecting means is equal to or higher than a predetermined value when predetermined time is elapsed after the compressor is started, or if the discharge pressure detected by the discharge pressure detecting means is lower than a second set pressure which is set lower than the first set pressure.
[0014] According to this aspect, since the heat pump hydronic heater can meet lengths of various pipes, it is possible to completely detect leakage of a refrigerant, and to provide the heat pump hydronic heater having improved usability. Further, since the compressor does not keep operating in a state where a refrigerant is insufficient, durability of the compressor can be enhanced.
[0015] According to a second aspect of the invention, in the first aspect, when a number of stoppages of operation of the compressor is equal to or higher than a predetermined number, the control device does not restart the compressor and informs this fact.
[0016] According to this aspect, it is possible to enhance the durability of the compressor, and to inform a user of abnormalities of the refrigeration cycle.
[0017] An embodiment of the present invention will be described with reference to the drawings. The invention is not limited to the embodiment.
[0018] Fig. 1 is a block diagram of a heat pump hydronic heater according to a first embodiment of the present invention. A configuration of the heat pump hydronic heater will be described using Fig. 1.
[0019] The heat pump hydronic heater of the embodiment includes a refrigeration cycle. The refrigeration cycle is formed by connecting, to one another through a refrigerant pipe 7, a compressor 1 which compresses a refrigerant and discharges a high temperature refrigerant, a water-refrigerant heat exchanger 3 which heat-exchanges between water and a high temperature refrigerant and produces a high temperature water, a decompressor 4 which decompresses a refrigerant, and an outdoor heat exchanger 5 which heat-exchanges between air and a refrigerant. A four-way valve 2 which switches between refrigerant flow paths is provided in the refrigeration cycle. The four-way valve 2 flows a refrigerant from the compressor 1 to the water-refrigerant heat exchanger 3 when a heating operation is carried out, and the four-way valve 2 flows a refrigerant from the compressor 1 to the outdoor heat exchanger 5 when a cooling operation is carried out.
[0020] The compressor 1, the decompressor 4 and the outdoor heat exchanger 5 are disposed in a heat pump unit 10a. The water-refrigerant heat exchanger 3 is disposed in a heat exchange unit 10b. The heat pump unit 10a and the heat exchange unit 10b are connected to each other through the refrigerant pipe 7.
[0021] A discharge pipe (refrigerant pipe 7) of the compressor 1 is provided with a discharge temperature sensor 1a which is discharge temperature detecting means for detecting a temperature of a refrigerant discharged from the compressor 1, and a discharge pressure sensor 1b which is pressure detecting means for detecting a pressure of a refrigerant discharged from the compressor 1.
[0022] There are also provided a blast fan 6 which sends air to the outdoor heat exchanger 5, and a temperature sensor 5a which is outside air temperature detecting means for detecting a temperature of air sucked into the outdoor heat exchanger 5.
[0023] A frequency of the compressor 1 is controlled such that a pressure detected by the discharge pressure sensor 1b does not exceed an operation using range of the compressor 1. As the refrigerant, R410A is used but a fluorocarbon-based refrigerant can also be used. The compressor 1 is of a hermetic type, a motor is disposed on a high pressure side, and a rare-earth magnet is used for the motor. Since an accumulator is not used, the heat pump hydronic heater can be made small in size and light in weight.
[0024] The heat pump hydronic heater includes a cooling/heating terminal 24 (such as a floor heating panel, a radiator panel and a fan coil unit) which cools and heats an interior of a room. Cold water or hot water produced by the water-refrigerant heat exchanger 3 is made to flow through an interior of the cooling/heating terminal 24, thereby cooling or heating the room.
[0025] The heat pump hydronic heater of the embodiment further includes a hot water supply tank 22 in which hot water to be supplied or used (for shower for example) is stored. High temperature water produced by the water-refrigerant heat exchanger 3 is made to flow through the hot water supply heat exchanger 23 to heat water in the hot water supply tank 22. Hence, a flow path switching valve 21 is provided on the side of an outlet of the water-refrigerant heat exchanger 3. By switching the flow path switching valve 21, water is circulate4d through a hot water supply water circuit 20a on the side of the hot water supply heat exchanger 23 and through a cooling/heating water circuit 20b on the side of the cooling/heating terminal 24.
[0026] A water pump 8 for circulating water is provided on the side of an inlet of the water-refrigerant heat exchanger 3. A temperature sensor 3a which is entering-water temperature detecting means for detecting an entering-water temperature is provided on the side of the inlet of the water-refrigerant heat exchanger 3. A temperature sensor 3b which is an outgoing-water temperature detecting means for detecting an outgoing-water temperature is provided on the side of an outlet of the water-refrigerant heat exchanger 3.
[0027] In a hot water supplying operation or a cooling/heating operation of the heat pump hydronic heater, the water pump 8 is driven, thereby circulating cold water or hot water through the hot water supply heat exchanger 23 or the cooling/heating terminal 24.
[0028] In the hot water supplying operation or a heating operation, the refrigeration cycle is operated until it is detected that a temperature of hot water detected by the temperature sensor 3b is higher than a temperature which is set by a remote control (not shown) by a predetermined temperature, and if it is detected that the temperature detected by the temperature sensor 3b is higher than the set temperature by the predetermined temperature, the operation of the refrigeration cycle is stopped.
[0029] In the cooling operation, the refrigeration cycle is operated until it is detected that a temperature of cold water detected by the temperature sensor 3b is lower than a temperature which is set by the remote control (not shown) by a predetermined temperature, and if the temperature detected by the temperature sensor 3b is lower than the set temperature by the predetermined temperature, the operation of the refrigeration cycle is stopped.
[0030] In the operation of the refrigeration cycle, an opening degree of the decompressor 4 is controlled so that a discharge temperature detected by the discharge temperature sensor 1a becomes equal to a predetermined temperature. However, since it is necessary to detect a temperature of water circulating through the cooling/heating terminal 24 or the hot water supply heat exchanger 23 even after the operation of the refrigeration cycle is stopped, the water pump 8 is driven. The water pump 8 may be an AC pump or a DC pump.
[0031] That is, according to the heat pump hydronic heater of the embodiment, of function parts configuring the refrigeration cycle, parts other than the water-refrigerant heat exchanger 3 are accommodated in a casing of the heat pump unit 10a, and the water-refrigerant heat exchanger 3 and the water pump 8 are accommodated in a casing of the heat exchange unit 10b.
[0032] In this case, the heat pump unit 10a is disposed outdoors and the heat exchange unit 10b is disposed indoors. According to this configuration, the indoor side and the outdoor side are connected to each other through the refrigerant pipe 7. Hence, even if an outside air temperature is low in winter or the like, since the indoor side and the outdoor side are connected to each other through the refrigerant pipe 7, there is a merit that a possibility of freeze is low as compared with a case where the indoor side and the outdoor side are connected to each other through a water pipe.
[0033] Each of the heat pump unit 10a and the heat exchange unit 10b includes control devices 11a and 11b, and the control devices 11a and 11b output operation instructions to devices provided in each of the units.
[0034] In the heat pump hydronic heater configured as described above, refrigerant leakage detection control will be described below.
[0035] Fig. 2 is a flowchart of the refrigerant leakage detection control of the heat pump hydronic heater. The refrigerant leakage detection control according the embodiment will be described below using Fig. 2.
[0036] If the operation is started, the control device 11a starts the compressor 1 (step 1), and determines whether predetermined time is elapsed after the compressor is operated (step 2). If the predetermined time is elapsed, the procedure is shifted to step 3.
[0037] In step 3, the control device 11a determines whether a pressure detected by the discharge pressure sensor 1b is lower than a second set pressure (lower than first set pressure). If the detected pressure is lower than the second set pressure, the procedure is shifted to step 5 and the compressor 1 is stopped. In step 3, if the detected pressure is equal to or higher than the second set pressure, the procedure is shifted to step 4.
[0038] In step 3, it is determined whether a refrigerant leaks. When a refrigerant completely leaks from the refrigeration cycle, since a discharge superheat degree can not precisely be detected, the refrigerant leakage is determined only based on a pressure.
[0039] In step 4, the control device 11a determines whether a pressure detected by the discharge pressure sensor 1b is lower than the first set pressure and whether the discharge superheat degree is equal to or higher than a set superheat degree. If the pressure is lower than the first set pressure and the discharge superheat degree is equal to or higher than the set superheat degree, the procedure is shifted to step 5 and the compressor 1 is stopped. In step 4, if the pressure is equal to or higher than the first set pressure and the discharge superheat degree is lower than the set superheat degree, the procedure is returned to step 3. In step 4, it is determined whether a refrigerant is halfway leaked.
[0040] Discharge superheat degree detecting means which detects a discharge superheat degree includes the discharge pressure sensor 1b and the discharge pressure sensor 1a. A pressure and a condensation temperature corresponding to that pressure are preset in the control device 11a. A discharge superheat degree is calculated by subtracting a preset condensation temperature corresponding to a pressure detected by the discharge pressure sensor 1 b from a temperature detected by the discharge temperature sensor 1 a.
[0041] If a temperature sensor which can detect the condensation temperature exists on the side of the condenser (water-refrigerant heat exchanger 3 at the time of heating operation and outdoor heat exchanger 5 at the time of cooling operation), the discharge superheat degree may be calculated by subtracting, from the discharge temperature detected by the discharge temperature sensor 1a, a condensation temperature detected by the temperature sensor which can detect the condensation temperature instead of the discharge pressure sensor 1b.
[0042] If leakage of a refrigerant is detected, the compressor 1 is stopped (step 5), and the number of abnormalities are counted up (step 6).
[0043] In step 7, the control device 11a determines whether the number of abnormalities reaches a predetermined number. If the number of abnormalities reaches the predetermined number, the system is made to go down, the abnormality is displayed on the remote control (not shown) (step 9). If the number of abnormalities does not reach the predetermined number, a restart of the compressor 1 is waited (step 8), and when three minutes are elapsed, the compressor 1 is restarted (step 1).
[0044] As described above, according to the heat pump hydronic heater of the embodiment, it is possible to reliably detect leakage of a refrigerant without depending upon a length of the connection pipe 7 between the units, and it is possible to safely stop the heat pump hydronic heater before the compressor 1 is damaged, and to inform a user of abnormality.
[Industrial Applicability] [0045] The present invention provides a heat pump hydronic heater having improved usability in which leakage of a refrigerant is not erroneously detected. Therefore, the invention can be applied not only to a domestic heat pump hydronic heater but also to a heat pump hydronic heater for business use.
REFERENCES CITED IN THE DESCRIPTION
This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.
Patent documents cited in the description • JF2011047607AΓ00051 • US5586445A rOOOSt
Claims (2)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012054150A JP2013185803A (en) | 2012-03-12 | 2012-03-12 | Heat pump hydronic heater |
Publications (1)
Publication Number | Publication Date |
---|---|
DK2639516T3 true DK2639516T3 (en) | 2017-07-24 |
Family
ID=47900736
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DK13158797.4T DK2639516T3 (en) | 2012-03-12 | 2013-03-12 | WATER BASED HEAT PUMP HEATING DEVICE |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2639516B1 (en) |
JP (1) | JP2013185803A (en) |
CN (1) | CN103307654B (en) |
DK (1) | DK2639516T3 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6128331B2 (en) * | 2014-02-26 | 2017-05-17 | 株式会社富士通ゼネラル | Hot water heater |
MA40777A (en) * | 2014-10-03 | 2017-08-08 | Mario Maistrello | HEATING SYSTEM IN WINTER AND AIR CONDITIONING IN SUMMER |
CN105402936B (en) * | 2015-12-22 | 2019-02-01 | Tcl空调器(中山)有限公司 | Air conditioner water heating machine and its coolant leakage detection method and device |
CN106839075A (en) * | 2017-04-06 | 2017-06-13 | 天津商业大学 | Miniature air-cooling source pump regenerative apparatus |
CN108019808A (en) * | 2017-12-04 | 2018-05-11 | 珠海格力电器股份有限公司 | Heat pump system and control method thereof |
JP2023041134A (en) | 2021-09-13 | 2023-03-24 | パナソニックIpマネジメント株式会社 | Heat medium circulation system |
JP2024021198A (en) * | 2022-08-03 | 2024-02-16 | パナソニックIpマネジメント株式会社 | Vapor compression type refrigeration cycle device |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2723339B2 (en) * | 1989-04-28 | 1998-03-09 | 株式会社東芝 | Heat pump heating equipment |
US5457965A (en) * | 1994-04-11 | 1995-10-17 | Ford Motor Company | Low refrigerant charge detection system |
US5586445A (en) * | 1994-09-30 | 1996-12-24 | General Electric Company | Low refrigerant charge detection using a combined pressure/temperature sensor |
US6406265B1 (en) * | 2000-04-21 | 2002-06-18 | Scroll Technologies | Compressor diagnostic and recording system |
JP4321095B2 (en) * | 2003-04-09 | 2009-08-26 | 日立アプライアンス株式会社 | Refrigeration cycle equipment |
JP3834577B2 (en) * | 2005-03-24 | 2006-10-18 | 日立ホーム・アンド・ライフ・ソリューション株式会社 | Heat pump heating system |
JP3995007B2 (en) * | 2005-05-30 | 2007-10-24 | ダイキン工業株式会社 | Humidity control device |
US7594407B2 (en) * | 2005-10-21 | 2009-09-29 | Emerson Climate Technologies, Inc. | Monitoring refrigerant in a refrigeration system |
JP2008232508A (en) * | 2007-03-19 | 2008-10-02 | Mitsubishi Electric Corp | Water heater |
JP2009008308A (en) * | 2007-06-27 | 2009-01-15 | Sanden Corp | Water heater |
JP2011521195A (en) * | 2008-05-14 | 2011-07-21 | キャリア コーポレイション | Transport refrigeration system and method of operation |
JP5387235B2 (en) | 2009-08-28 | 2014-01-15 | パナソニック株式会社 | Heat pump type hot water heater |
JP2011094810A (en) * | 2009-09-30 | 2011-05-12 | Fujitsu General Ltd | Heat pump cycle apparatus |
JP5398571B2 (en) * | 2010-02-15 | 2014-01-29 | 三菱重工業株式会社 | Air conditioner |
-
2012
- 2012-03-12 JP JP2012054150A patent/JP2013185803A/en active Pending
-
2013
- 2013-03-12 EP EP13158797.4A patent/EP2639516B1/en active Active
- 2013-03-12 CN CN201310077859.8A patent/CN103307654B/en not_active Expired - Fee Related
- 2013-03-12 DK DK13158797.4T patent/DK2639516T3/en active
Also Published As
Publication number | Publication date |
---|---|
CN103307654A (en) | 2013-09-18 |
EP2639516A3 (en) | 2014-03-26 |
EP2639516B1 (en) | 2017-06-14 |
JP2013185803A (en) | 2013-09-19 |
EP2639516A2 (en) | 2013-09-18 |
CN103307654B (en) | 2017-05-31 |
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