CN115823759A - Compression refrigeration system and control method - Google Patents
Compression refrigeration system and control method Download PDFInfo
- Publication number
- CN115823759A CN115823759A CN202211492611.3A CN202211492611A CN115823759A CN 115823759 A CN115823759 A CN 115823759A CN 202211492611 A CN202211492611 A CN 202211492611A CN 115823759 A CN115823759 A CN 115823759A
- Authority
- CN
- China
- Prior art keywords
- compressor
- power generation
- generation device
- refrigeration system
- pressure
- 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.)
- Pending
Links
- 238000005057 refrigeration Methods 0.000 title claims abstract description 42
- 230000006835 compression Effects 0.000 title claims abstract description 39
- 238000007906 compression Methods 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000010248 power generation Methods 0.000 claims abstract description 45
- 239000003507 refrigerant Substances 0.000 claims abstract description 38
- 230000001276 controlling effect Effects 0.000 claims description 22
- 230000001105 regulatory effect Effects 0.000 claims description 12
- 238000007599 discharging Methods 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Landscapes
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention provides a compression refrigeration system and a control method, relates to the technical field of refrigeration devices, and solves the technical problem that energy is wasted when a compressor is shut down due to low-pressure protection in the prior art by directly discharging a high-pressure refrigerant at an exhaust end of the compressor to an air return end of the compressor by adopting a hot gas bypass. The compression refrigeration system comprises a compressor and a bypass pipeline which is connected with an exhaust end and an air suction end of the compressor, and is characterized by further comprising a power generation device, wherein the power generation device is arranged on the bypass pipeline, and the power generation device can generate power when refrigerant flowing through the bypass pipeline passes through the power generation device. The invention is used for recovering the energy of the refrigerant flowing in the bypass pipeline.
Description
Technical Field
The invention relates to the technical field of refrigerating devices, in particular to a compression refrigerating system and a control method.
Background
Many large refrigeration plants currently employ fixed speed compressors. When the load required by the refrigeration system is small, the pressure at the suction end of the compressor is too low, the system generates low-pressure protection, and the compressor stops. Frequent starting and stopping of the compressor not only affects normal operation of the unit, but also greatly affects service life of the compressor.
The current method for solving the problem of compressor shutdown due to low-pressure protection is as follows: firstly, a hot gas bypass is adopted to directly discharge a high-pressure refrigerant at the exhaust end of the compressor to the air return end of the compressor, so that the pressure at the air return end of the compressor is prevented from being too low; another way is to start the cooling-accompanying mode in a multi-split unit (i.e. one compressor is connected with a plurality of evaporators connected in parallel), i.e. to increase the flow rate of the refrigerant flowing through the evaporators for the evaporators which are not needed or have low demand of cooling capacity. Both of these ways produce a waste of energy.
Disclosure of Invention
The invention aims to provide a compression refrigeration system and a control method, and solves the technical problem that energy is wasted when a compressor is shut down due to low-pressure protection by directly discharging a high-pressure refrigerant at an exhaust end of the compressor to an air return end of the compressor by adopting a hot gas bypass in the prior art. The technical effects that can be produced by the preferred technical scheme of the technical schemes provided by the invention are described in detail in the following.
In order to realize the purpose, the invention provides the following technical scheme:
the invention provides a compression refrigeration system, which comprises a compressor and a bypass pipeline connecting an exhaust end and an air suction end of the compressor, and is characterized by further comprising a power generation device, wherein the power generation device is arranged on the bypass pipeline, and the power generation device can generate power when refrigerant flowing through the bypass pipeline passes through the power generation device.
Furthermore, the power generation device comprises an impeller and a generator, the impeller is in transmission connection with the generator, the impeller is arranged on the bypass pipeline, and the refrigerant flowing through the bypass pipeline drives the impeller to rotate so as to be used for the generator to generate power.
Furthermore, an electromagnetic valve and a pressure regulating valve are arranged on the bypass pipeline, and the electromagnetic valve and the pressure regulating valve are respectively positioned on the refrigerant inlet side and the refrigerant outlet side of the impeller.
Further, the power generation device also comprises a storage battery used for storing electric energy.
Further, the storage battery is connected with a control device of the compression refrigeration system, and the storage battery can supply power to the compression refrigeration system.
The invention provides a control method of the compression refrigeration system, which comprises the following steps: detecting a pressure value of a suction end of the compressor; judging whether the pressure value of the air suction end of the compressor is smaller than a preset low-pressure protection value P 2 (ii) a If yes, controlling part of the refrigerant at the exhaust end of the compressor to be exhausted to the air suction end of the compressor through a bypass pipeline, and enabling the power generation device to generate power when the refrigerant flowing through the bypass pipeline passes through the power generation device.
Further, the following contents are also included: judging whether the pressure value of the air suction end of the compressor is greater than a preset high pressure value P 0 (ii) a If yes, the bypass pipeline is controlled to be closed.
Further, the following contents are also included: if the pressure value of the air suction end of the compressor is less than the third preset pressure value P 12 Controlling the compressor to load; if the pressure value of the air suction end of the compressor is greater than the fourth pressure preset value P 01 Controlling the compressor to load and unload; if the pressure value of the air suction end of the compressor is not more than the fourth pressure preset value P 01 And is not less than the third pressure preset value P 12 Controlling the load of the compressor to keep unchanged; wherein, P 0 >P 01 >P 1 >P 12 >P 2 。
Further, the following contents are also included: judging whether the electric quantity of a storage battery of the power generation device is larger than a first preset electric quantity value K or not 1 (ii) a If so, controlling the storage battery to supply power to the compression refrigeration system; judging whether the electric quantity of the storage battery of the power generation device is smaller than a second preset electric quantity value K or not 2 (ii) a And if so, controlling the storage battery to stop supplying power to the compression refrigeration system.
Further, comprising: and judging the relation between the pressure value of the air suction end of the compressor and a preset value at set time intervals t.
The invention can produce the following beneficial effects: the invention provides a compression refrigeration system, which comprises a compressor, a bypass pipeline and a power generation device, wherein the bypass pipeline is connected with an exhaust end and an air suction end of the compressor, the power generation device is arranged on the bypass pipeline, and the power generation device can generate power when refrigerant flowing through the bypass pipeline passes through the power generation device. The compressor is the constant speed compressor, namely through set up power generation facility on bypass pipeline for when having the refrigerant to discharge to the compressor return-air end through the compressor exhaust end on bypass pipeline, power generation facility can generate electricity, retrieves the energy of refrigerant.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a compression refrigeration system provided by an embodiment of the present invention;
fig. 2 is a control flow chart of a compression refrigeration system according to an embodiment of the present invention;
FIG. 3 is a schematic view of a power plant impeller provided by an embodiment of the present invention;
fig. 4 is a schematic diagram of a power generation device provided by an embodiment of the invention and a bypass pipeline.
In the figure, 01-compressor; 02-a four-way valve; 03-a condenser; 04-a first throttle valve; 05-a second throttle valve; 06-a third throttle valve; 07-a first evaporator; 08-a second evaporator; 09-a third evaporator; 010-pressure sensors; 011 a check valve; 012-solenoid valve; 013-an impeller; 014-generator; 015-storage battery; 016-pressure regulating valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
The invention provides a compression refrigeration system which comprises a compressor 01, a bypass pipeline and a power generation device, wherein the bypass pipeline is connected with an exhaust end and an air suction end of the compressor 01, the power generation device is arranged on the bypass pipeline, and the power generation device can generate power when refrigerant flowing through the bypass pipeline passes through the power generation device. The compressor 01 is a constant-speed compressor, namely, a power generation device is arranged on the bypass pipeline, so that when a refrigerant on the bypass pipeline is discharged to the air return end of the compressor through the exhaust end of the compressor, the power generation device can generate power and recover the energy of the refrigerant.
Generally, a pressure regulating valve 016 is arranged on a bypass pipeline, the pressure regulating valve 016 can reduce the pressure of a refrigerant discharged from an exhaust end of a compressor, the refrigerant after pressure reduction flows to a suction end of the compressor, and when a hot gas bypass is adopted to directly discharge the high-pressure refrigerant at the exhaust end of the compressor to a return end of the compressor so as to avoid the shutdown of the compressor due to low-pressure protection, energy waste exists. And the energy of the refrigerant in the bypass pipeline can be reasonably utilized by arranging the power generation device on the bypass pipeline.
The power generator includes an impeller 013 and a generator 014, the impeller 013 is in transmission connection with the generator 014, the impeller 013 is provided on a bypass line, and the refrigerant flowing through the bypass line rotates the impeller 013 for the generator 014 to generate power. Referring to fig. 3 and 4, the impeller 013 is shown in simplified schematic form. When the refrigerant passes through the impeller 013 on the bypass pipeline, the refrigerant can drive the impeller 013 to rotate, the impeller 013 is connected with the generator 014, and the generator 014 converts mechanical energy into electric energy.
The impeller 013 is positioned in the bypass pipeline, a rotating shaft connected with the impeller 013 penetrates through the bypass pipeline to be connected with the generator 014, and the rotating shaft is in sealing fit with the bypass pipeline. The specific structure of the sealing and matching structure and the generator 014 may be implemented by the prior art, and will not be described herein.
The bypass line is provided with a solenoid valve 012 and a pressure regulating valve 016, and the solenoid valve 012 and the pressure regulating valve 016 are respectively positioned on the refrigerant inlet side and the refrigerant outlet side of the impeller 013. When the pressure at the air suction end of the compressor 01 is too low and a bypass pipeline is needed for air return, the electromagnetic valve 012 needs to be opened; when the bypass line is required to return air, the solenoid valve 012 is closed. As for the pressure regulating valve 016, as described above, the pressure regulating valve 016 can regulate the pressure of the refrigerant discharged from the discharge end of the compressor.
The power generation device further includes a storage battery 015 for storing electric energy. Preferably, the accumulator 015 is connected to a control device of the compression refrigeration system, and the accumulator 015 can supply power to the compression refrigeration system. The electric quantity of the storage battery 015 is detected, when the electric quantity of the storage battery 015 is lower than a set value, the electric quantity represents the insufficient state of the storage battery, the storage battery 015 does not participate in power supply of the compression refrigeration system, power is directly supplied by a power grid, and normal operation of the refrigeration system is guaranteed. When the electric quantity of the storage battery is higher than a set value, the storage battery 015 participates in power supply of the compression refrigeration system, and the energy-saving effect is achieved.
A control method for a compression refrigeration system comprising the steps of: detecting a pressure value of a suction end of the compressor 01; judging whether the pressure value of the air suction end of the compressor 01 is smaller than a preset low-pressure protection value P or not 2 (ii) a If yes, part of the refrigerant at the exhaust end of the compressor 01 is controlled to be discharged to the air suction end of the compressor 01 through the bypass pipeline, and the power generation device can generate power when the refrigerant flowing through the bypass pipeline passes through the power generation device. The power generation plant will recover the coldThe energy of the medium is converted into electric energy.
The control method of the compression refrigeration system further comprises the following steps: judging whether the pressure value of the air suction end of the compressor 01 is greater than a preset high pressure value P 0 (ii) a If yes, the bypass pipeline is controlled to be closed.
The control method of the compression refrigeration system further comprises the following steps: if the pressure value of the air suction end of the compressor 01 is less than the third preset pressure value P 12 Controlling the compressor 01 to load; if the pressure value of the air suction end of the compressor 01 is greater than the fourth pressure preset value P 01 If yes, controlling the compressor 01 to load or unload; if the pressure value of the air suction end of the compressor 01 is not more than the fourth pressure preset value P 01 And is not less than the third pressure preset value P 12 If so, controlling the load of the compressor 01 to keep unchanged; wherein, P 0 >P 01 >P 1 >P 12 >P 2 。
Referring to fig. 2, a control flow diagram of a compression refrigeration system is shown. When the compression refrigeration unit is in operation, the pressure sensor 010 detects the pressure at the air suction end of the compressor, and the pressure sensor 010 detects a pressure signal P K Transmitting to a controller, judging the pressure of the air suction end of the compressor by the controller, and judging if P is detected in a detection period t K <P 12 Controlling the compressor 01 to load; if P is in the past of a detection period t K >P 01 Controlling the compressor 01 to load and unload; if P is in the past of a detection period t 12 ≤P K ≤P 01 If yes, controlling the compressor 01 to keep unchanged; if P is in the past of a detection period t K <P 2 When the controller controls to open the solenoid valve 012, the high-pressure refrigerant flows through the bypass line, the impeller 013 is driven to rotate at a high speed, the impeller 013 drives the rotor of the generator 014 to rotate to generate electricity, and the electricity generated by the generator 014 is stored in the battery 015. The pressure of the refrigerant passing through the impeller 013 is reduced and then passes through the pressure regulating valve 016, and the pressure after the valve is a fixed value P 1 。
Continuously judging the pressure of the air suction end of the compressor, and if P is detected in a detection period t K <P 12 Then the compressor 01 is controlled to load(ii) a If P is in the past of a detection period t K >P 01 Controlling the compressor 01 to load and unload; if P is in the past of a detection period t 12 ≤P K ≤P 01 If so, controlling the compressor 01 to keep unchanged; if P is in the past of a detection period t K >P 0 The controller closes the solenoid valve 012 and closes the bypass power generation device.
Preferably, the control method of the compression refrigeration system further includes the following: judging whether the electric quantity of the storage battery 015 of the power generation device is larger than a first preset electric quantity value K or not 1 (ii) a If yes, controlling the storage battery 015 to supply power to the compression refrigeration system; judging whether the electric quantity of the power generation device storage battery 015 is smaller than a second preset electric quantity value K or not 2 (ii) a If yes, the storage battery 015 is controlled to stop supplying power to the compression refrigeration system. The user can set a first preset electric quantity value K of the storage battery 015 1 And a second predetermined electric quantity value K 2 . When the electric quantity of the power generation device storage battery 015 is smaller than the second preset electric quantity value K 2 In the meantime, the storage battery 015 does not participate in the power supply of the compression refrigeration unit, and the storage battery waits for charging.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and shall cover the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A compression refrigeration system comprises a compressor (01) and a bypass pipeline connecting a discharge end and a suction end of the compressor (01), and is characterized by further comprising a power generation device, wherein,
the power generation device is arranged on the bypass pipeline, and the power generation device can generate power when the refrigerant flowing through the bypass pipeline passes through the power generation device.
2. The compression refrigeration system of claim 1, wherein the power generation device comprises an impeller (013) and a generator (014), the impeller (013) is in driving connection with the generator (014), the impeller (013) is disposed on the bypass line, and refrigerant flowing through the bypass line rotates the impeller (013) for generating power by the generator (014).
3. The compression refrigeration system according to claim 2, wherein a solenoid valve (012) and a pressure regulating valve (016) are provided on the bypass line, and the solenoid valve (012) and the pressure regulating valve (016) are respectively located on a refrigerant inlet side and a refrigerant outlet side of the impeller (013).
4. The compression refrigeration system of claim 1, wherein the power plant further comprises a battery (015) to store electrical energy.
5. A compression refrigeration system according to claim 4, wherein the accumulator (015) is connected to a control of the compression refrigeration system, the accumulator (015) being capable of powering the compression refrigeration system.
6. A method of controlling a compression refrigeration system as claimed in any one of claims 1 to 5, comprising:
detecting the pressure value of the air suction end of the compressor (01);
judging whether the pressure value of the air suction end of the compressor (01) is less than a preset low-pressure protection value P 2 ；
If yes, controlling part of the refrigerant at the exhaust end of the compressor (01) to be discharged to the air suction end of the compressor (01) through a bypass pipeline, wherein the power generation device can generate power when the refrigerant flowing through the bypass pipeline passes through the power generation device.
7. The control method according to claim 6, characterized by further comprising:
judging whether the pressure value of the air suction end of the compressor (01) is greater than a preset high pressure value P 0 ；
If yes, the bypass pipeline is controlled to be closed.
8. The control method according to claim 7, characterized by further comprising:
if the pressure value of the air suction end of the compressor (01) is less than the third pressure preset value P 12 Controlling the compressor (01) to load;
if the pressure value of the air suction end of the compressor (01) is greater than the fourth pressure preset value P 01 Controlling the compressor (01) to load and unload;
if the pressure value of the air suction end of the compressor (01) is not more than the fourth pressure preset value P 01 And is not less than the third pressure preset value P 12 Controlling the load of the compressor (01) to be kept unchanged;
wherein, P 0 >P 01 >P 1 >P 12 >P 2 。
9. The control method according to claim 6, characterized by further comprising:
judging whether the electric quantity of a storage battery (015) of the power generation device is larger than a first preset electric quantity value K or not 1 ；
If yes, controlling the storage battery (015) to supply power to the compression refrigeration system;
judging whether the electric quantity of the storage battery (015) of the power generation device is smaller than a second preset electric quantity value K or not 2 ；
And if so, controlling the storage battery (015) to stop supplying power to the compression refrigeration system.
10. The control method according to claim 6, characterized by comprising:
and judging the relation between the pressure value of the air suction end of the compressor (01) and a preset value at set time intervals t.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211492611.3A CN115823759A (en) | 2022-11-25 | 2022-11-25 | Compression refrigeration system and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211492611.3A CN115823759A (en) | 2022-11-25 | 2022-11-25 | Compression refrigeration system and control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115823759A true CN115823759A (en) | 2023-03-21 |
Family
ID=85531684
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211492611.3A Pending CN115823759A (en) | 2022-11-25 | 2022-11-25 | Compression refrigeration system and control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115823759A (en) |
Citations (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2057659A (en) * | 1979-09-05 | 1981-04-01 | Carrier Corp | Method of operating a refrigeration system |
| JPH0885454A (en) * | 1994-07-22 | 1996-04-02 | Nippondenso Co Ltd | Air conditioner in electric car |
| JP2004144399A (en) * | 2002-10-25 | 2004-05-20 | Matsushita Electric Ind Co Ltd | Refrigeration cycle device |
| CN2762012Y (en) * | 2004-12-15 | 2006-03-01 | 广东美的电器股份有限公司 | Fast starting air conditioner |
| JP2006162186A (en) * | 2004-12-09 | 2006-06-22 | Matsushita Electric Ind Co Ltd | Refrigerating cycle device |
| US20080168781A1 (en) * | 2005-02-10 | 2008-07-17 | Yuuichi Yakumaru | Refrigerating Machine |
| KR20100103770A (en) * | 2009-03-15 | 2010-09-28 | 임효진 | The condensing system for thermal plant using refrigerant evaporation heat |
| US20120167606A1 (en) * | 2009-10-07 | 2012-07-05 | Mitsubishi Electric Corporation | Refrigeration cycle apparatus |
| US20130118196A1 (en) * | 2010-07-19 | 2013-05-16 | Zhejiang Boyang Compressor Co., Ltd. | Mobile refrigeration equipment with dc drive |
| KR101515933B1 (en) * | 2014-09-04 | 2015-05-04 | 김봉석 | Power generrating apparatus using refrigenating cycle |
| WO2015104823A1 (en) * | 2014-01-09 | 2015-07-16 | 三菱電機株式会社 | Refrigeration cycle device |
| WO2015161743A1 (en) * | 2014-04-22 | 2015-10-29 | 珠海格力电器股份有限公司 | Air-conditioning system with defrosting function |
| CN106595158A (en) * | 2016-12-22 | 2017-04-26 | 重庆美的通用制冷设备有限公司 | Low-pressure control method, system and air conditioner for unit refrigeration system |
| CN206281265U (en) * | 2016-10-26 | 2017-06-27 | 深圳麦克维尔空调有限公司 | One kind freezing unit and its compressor pressure control device |
| US20200191108A1 (en) * | 2018-12-12 | 2020-06-18 | William J. Diaz | Refrigeration cycle ejector power generator |
| CN210832643U (en) * | 2019-10-28 | 2020-06-23 | 广东美的制冷设备有限公司 | Air conditioning system |
| CN113251522A (en) * | 2021-05-25 | 2021-08-13 | 珠海格力电器股份有限公司 | Air conditioning unit and control method thereof |
| CN113587484A (en) * | 2020-04-30 | 2021-11-02 | 广东美的制冷设备有限公司 | Air conditioning system, air conditioning pressure detection method and computer readable storage medium |
| CN113623889A (en) * | 2021-07-30 | 2021-11-09 | 青岛海尔空调电子有限公司 | Control method for air source heat pump unit |
| WO2021233465A1 (en) * | 2020-10-22 | 2021-11-25 | 青岛海尔空调电子有限公司 | Control method for air conditioning unit, and air conditioning unit |
| US20220275982A1 (en) * | 2019-11-22 | 2022-09-01 | Denso Corporation | Refrigeration cycle device |
| CN114992906A (en) * | 2021-03-02 | 2022-09-02 | 广东美的暖通设备有限公司 | Control method of heat pump system, and readable storage medium |
| CN217785508U (en) * | 2022-07-04 | 2022-11-11 | 川田机械制造(上海)有限公司 | Capacity regulator for non-frequency conversion refrigerating system |
-
2022
- 2022-11-25 CN CN202211492611.3A patent/CN115823759A/en active Pending
Patent Citations (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2057659A (en) * | 1979-09-05 | 1981-04-01 | Carrier Corp | Method of operating a refrigeration system |
| JPH0885454A (en) * | 1994-07-22 | 1996-04-02 | Nippondenso Co Ltd | Air conditioner in electric car |
| JP2004144399A (en) * | 2002-10-25 | 2004-05-20 | Matsushita Electric Ind Co Ltd | Refrigeration cycle device |
| JP2006162186A (en) * | 2004-12-09 | 2006-06-22 | Matsushita Electric Ind Co Ltd | Refrigerating cycle device |
| CN2762012Y (en) * | 2004-12-15 | 2006-03-01 | 广东美的电器股份有限公司 | Fast starting air conditioner |
| US20080168781A1 (en) * | 2005-02-10 | 2008-07-17 | Yuuichi Yakumaru | Refrigerating Machine |
| KR20100103770A (en) * | 2009-03-15 | 2010-09-28 | 임효진 | The condensing system for thermal plant using refrigerant evaporation heat |
| US20120167606A1 (en) * | 2009-10-07 | 2012-07-05 | Mitsubishi Electric Corporation | Refrigeration cycle apparatus |
| US20130118196A1 (en) * | 2010-07-19 | 2013-05-16 | Zhejiang Boyang Compressor Co., Ltd. | Mobile refrigeration equipment with dc drive |
| WO2015104823A1 (en) * | 2014-01-09 | 2015-07-16 | 三菱電機株式会社 | Refrigeration cycle device |
| WO2015161743A1 (en) * | 2014-04-22 | 2015-10-29 | 珠海格力电器股份有限公司 | Air-conditioning system with defrosting function |
| KR101515933B1 (en) * | 2014-09-04 | 2015-05-04 | 김봉석 | Power generrating apparatus using refrigenating cycle |
| CN206281265U (en) * | 2016-10-26 | 2017-06-27 | 深圳麦克维尔空调有限公司 | One kind freezing unit and its compressor pressure control device |
| CN106595158A (en) * | 2016-12-22 | 2017-04-26 | 重庆美的通用制冷设备有限公司 | Low-pressure control method, system and air conditioner for unit refrigeration system |
| US20200191108A1 (en) * | 2018-12-12 | 2020-06-18 | William J. Diaz | Refrigeration cycle ejector power generator |
| CN210832643U (en) * | 2019-10-28 | 2020-06-23 | 广东美的制冷设备有限公司 | Air conditioning system |
| US20220275982A1 (en) * | 2019-11-22 | 2022-09-01 | Denso Corporation | Refrigeration cycle device |
| CN113587484A (en) * | 2020-04-30 | 2021-11-02 | 广东美的制冷设备有限公司 | Air conditioning system, air conditioning pressure detection method and computer readable storage medium |
| WO2021233465A1 (en) * | 2020-10-22 | 2021-11-25 | 青岛海尔空调电子有限公司 | Control method for air conditioning unit, and air conditioning unit |
| CN114992906A (en) * | 2021-03-02 | 2022-09-02 | 广东美的暖通设备有限公司 | Control method of heat pump system, and readable storage medium |
| CN113251522A (en) * | 2021-05-25 | 2021-08-13 | 珠海格力电器股份有限公司 | Air conditioning unit and control method thereof |
| CN113623889A (en) * | 2021-07-30 | 2021-11-09 | 青岛海尔空调电子有限公司 | Control method for air source heat pump unit |
| CN217785508U (en) * | 2022-07-04 | 2022-11-11 | 川田机械制造(上海)有限公司 | Capacity regulator for non-frequency conversion refrigerating system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10995664B2 (en) | Compressed air energy storage and power generation method and compressed air energy storage and power generation device | |
| US10330008B2 (en) | Compressed air energy storage and power generation method and apparatus | |
| US7332885B2 (en) | Ride-through method and system for HVAC&R chillers | |
| JP4196307B1 (en) | Steam system | |
| US8522523B2 (en) | Steam system | |
| CN111517281A (en) | Altitude-adaptive portable oxygen generator and oxygen generation method | |
| US11205790B2 (en) | Fuel cell system and method of controlling the same | |
| CN112290057A (en) | Fuel cell air supply system based on turbocharging and control method thereof | |
| CN115823759A (en) | Compression refrigeration system and control method | |
| US20210381428A1 (en) | Compressed air energy storage power generation device and compressed air energy storage power generation method | |
| US6698223B2 (en) | Energy collecting system and method of operating the same | |
| CN114198919B (en) | Air suspension unit system | |
| CN114284525B (en) | Hydrogen circulation system for fuel cell and hydrogen supply control method thereof | |
| CN216429699U (en) | Compressed air energy storage system with dynamic load response function | |
| JP2019027385A (en) | Compressed air storage power generation device and method | |
| WO2017130303A1 (en) | Gas compressor and gas compressor system | |
| JP4463011B2 (en) | Capacity control method and capacity control apparatus for fluid compressor | |
| CN114087043B (en) | Compressed air energy storage system with dynamic load response function and control method | |
| CN216143863U (en) | Compressor system and air conditioner | |
| CN214145797U (en) | Energy-conserving air compressor machine that fuel injection quantity intelligent control adjusted | |
| CN218936697U (en) | Water chilling unit and central air conditioner | |
| JP2013051785A (en) | Management system of power consumption facility | |
| CN215890118U (en) | Back pressure unit heating system of adjustable back pressure | |
| KR101881950B1 (en) | Air Compressor System Having Multi type Coolers and Air Compressors with Different Controller | |
| CN116292251A (en) | Water vapor compressor testing system and testing method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |