CN117006720A - Cascade heat pump system and control method thereof - Google Patents
Cascade heat pump system and control method thereof Download PDFInfo
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- CN117006720A CN117006720A CN202210470619.3A CN202210470619A CN117006720A CN 117006720 A CN117006720 A CN 117006720A CN 202210470619 A CN202210470619 A CN 202210470619A CN 117006720 A CN117006720 A CN 117006720A
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000003507 refrigerant Substances 0.000 claims abstract description 106
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims abstract description 47
- 229910052731 fluorine Inorganic materials 0.000 claims abstract description 47
- 239000011737 fluorine Substances 0.000 claims abstract description 47
- 238000004891 communication Methods 0.000 claims description 20
- 238000000926 separation method Methods 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 230000007613 environmental effect Effects 0.000 description 6
- 230000003287 optical effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- LVGUZGTVOIAKKC-UHFFFAOYSA-N 1,1,1,2-tetrafluoroethane Chemical compound FCC(F)(F)F LVGUZGTVOIAKKC-UHFFFAOYSA-N 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- 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
- F24H4/00—Fluid heaters characterised by the use of heat pumps
- F24H4/02—Water heaters
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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
- F25B27/00—Machines, plants or systems, using particular sources of energy
-
- 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
- F25B27/00—Machines, plants or systems, using particular sources of energy
- F25B27/002—Machines, plants or systems, using particular sources of energy using solar energy
- F25B27/005—Machines, plants or systems, using particular sources of energy using solar energy in compression type systems
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
- F25B41/22—Disposition of valves, e.g. of on-off valves or flow control valves between evaporator and compressor
-
- 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
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
-
- 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
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
-
- 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
- F25B7/00—Compression machines, plants or systems, with cascade operation, i.e. with two or more circuits, the heat from the condenser of one circuit being absorbed by the evaporator of the next circuit
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- 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)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The application relates to the technical field of cascade heat pumps, in particular to a cascade heat pump system and a control method thereof, and aims to solve the problem of low operation energy efficiency of the existing cascade heat pump system. The cascade heat pump system comprises a high-pressure refrigerant circulation loop and a low-pressure refrigerant circulation loop, wherein the high-pressure refrigerant circulation loop is provided with a first compressor, a first heat exchanger, a first throttling component and an intermediate heat exchanger, the low-pressure refrigerant circulation loop is provided with a second compressor, a fluorine pump, an intermediate heat exchanger, a second throttling component and a second heat exchanger, the second compressor and the fluorine pump are arranged in parallel, and the high-pressure refrigerant circulation loop and the low-pressure refrigerant circulation loop can exchange heat through the intermediate heat exchanger. According to the cascade heat pump system, the second compressor and the fluorine pump are controlled to operate in a parallel mode, so that the second compressor is effectively prevented from being in an operating state all the time, and the operating energy efficiency of the cascade heat pump system is effectively improved.
Description
Technical Field
The application relates to the technical field of cascade heat pumps, and particularly provides a cascade heat pump system and a control method thereof.
Background
The cascade heat pump system generally comprises a high-pressure refrigerant circulation loop and a low-pressure refrigerant circulation loop, and the high-pressure refrigerant circulation loop and the low-pressure refrigerant circulation loop exchange heat through a shared intermediate heat exchanger so as to achieve the purpose of providing high-temperature hot water. However, existing cascade heat pump systems still require cascade operation outside of rated conditions, for example, when the outdoor ambient temperature is relatively high, i.e., two-stage compression is still employed under conditions where the difference between the evaporating temperature and the condensing temperature is small, resulting inThe loss is large, so that the operation energy efficiency of the cascade heat pump system is low, and the energy waste is caused.
Accordingly, there is a need in the art for a new cascade heat pump system and control method thereof to solve the above-mentioned technical problems.
Disclosure of Invention
The application aims to solve the technical problem that the operation energy efficiency of the existing cascade heat pump system is low.
In a first aspect, the present application provides an overlapping heat pump system comprising a high pressure refrigerant circulation loop and a low pressure refrigerant circulation loop,
the high-pressure refrigerant circulation loop is provided with a first compressor, a first heat exchanger, a first throttling component and an intermediate heat exchanger,
the low-pressure refrigerant circulation loop is provided with a second compressor, a fluorine pump, the intermediate heat exchanger, a second throttling component and a second heat exchanger, wherein the second compressor and the fluorine pump are arranged in parallel,
the high-pressure refrigerant circulation loop and the low-pressure refrigerant circulation loop are arranged to be capable of exchanging heat through the intermediate heat exchanger.
In the preferable technical scheme of the cascade heat pump system, the low-pressure refrigerant circulation loop is also provided with a three-way valve,
the three-way valve comprises an inlet and two outlets, the inlet of the three-way valve is connected with the main path of the low-pressure refrigerant circulation loop, the first outlet of the three-way valve is connected with the air inlet of the second compressor, and the second outlet of the three-way valve is connected with the air inlet of the fluorine pump.
In the preferable technical scheme of the cascade heat pump system, a solar heat collector is further arranged on the low-pressure refrigerant circulation loop, and the solar heat collector is arranged between the second throttling component and the second heat exchanger.
In a preferred embodiment of the above-mentioned cascade heat pump system, the cascade heat pump system further comprises a bypass branch,
the bypass branch is connected with the low-pressure refrigerant circulation loop, the first end of the bypass branch is connected between the second throttling component and the solar heat collector, the second end of the bypass branch is connected between the solar heat collector and the second heat exchanger,
the bypass branch is provided with a bypass valve, and the bypass valve is arranged to control the condition that the solar heat collector is connected into the low-pressure refrigerant circulation loop by controlling the opening and closing states of the bypass valve.
In the preferable technical scheme of the cascade heat pump system, the cascade heat pump system further comprises a heat exchange waterway,
and a part of the heat exchange waterway is arranged in the first heat exchanger so that water in the heat exchange waterway exchanges heat with the refrigerant in the high-pressure refrigerant circulation loop through the first heat exchanger.
In the preferable technical scheme of the cascade heat pump system, a first air separation device is further arranged on the high-pressure refrigerant circulation loop, and the first air separation device is arranged at the air inlet of the first compressor.
In the preferable technical scheme of the cascade heat pump system, a second gas separation device is further arranged on the low-pressure refrigerant circulation loop, and the second gas separation device is arranged at the gas inlet of the second compressor.
On the other hand, the application also provides a control method of the cascade heat pump system, the cascade heat pump system comprises a high-pressure refrigerant circulation loop and a low-pressure refrigerant circulation loop,
the high-pressure refrigerant circulation loop is provided with a first compressor, a first heat exchanger, a first throttling component and an intermediate heat exchanger,
the low-pressure refrigerant circulation loop is provided with a second compressor, a fluorine pump, the intermediate heat exchanger, a second throttling component and a second heat exchanger, wherein the second compressor and the fluorine pump are arranged in parallel,
the high-pressure refrigerant circulation loop and the low-pressure refrigerant circulation loop are arranged to be capable of exchanging heat through the intermediate heat exchanger,
the low-pressure refrigerant circulation loop is also provided with a three-way valve, the three-way valve comprises an inlet and two outlets, the inlet of the three-way valve is connected with the main path of the low-pressure refrigerant circulation loop, the first outlet of the three-way valve is connected with the air inlet of the second compressor, the second outlet of the three-way valve is connected with the air inlet of the fluorine pump,
the low-pressure refrigerant circulation loop is also provided with a solar heat collector which is arranged between the second throttling component and the second heat exchanger,
the cascade heat pump system further comprises a bypass branch, wherein a first end of the bypass branch is connected between the second throttling component and the solar heat collector, a second end of the bypass branch is connected between the solar heat collector and the second heat exchanger, and a bypass valve is arranged on the bypass branch;
under the condition that the high-pressure refrigerant circulation loop operates, the control method comprises the following steps:
acquiring irradiance;
controlling the communication state of the bypass branch and the operation state of the solar heat collector according to the irradiance and the preset irradiance;
acquiring outdoor environment temperature;
and controlling the communication state of the three-way valve and the running states of the second compressor and the fluorine pump according to the outdoor environment temperature and the preset environment temperature.
In the above preferred technical solution of the control method, the step of controlling the communication state of the bypass branch and the operation state of the solar collector according to the irradiance and the preset irradiance specifically includes:
if the irradiance is greater than or equal to the preset irradiance, controlling the bypass branch not to be communicated and the solar collector to operate;
and if the irradiance is smaller than the preset irradiance, controlling the bypass branch to be communicated and the solar heat collector not to operate.
In the above preferred technical solution of the control method, the step of controlling the communication state of the three-way valve and the operation states of the second compressor and the fluorine pump according to the outdoor ambient temperature and the preset ambient temperature specifically includes:
if the outdoor ambient temperature is greater than or equal to the preset ambient temperature, controlling the inlet of the three-way valve to be communicated with a second outlet, wherein the second compressor is not operated and the fluorine pump is operated;
and if the outdoor environment temperature is smaller than the preset environment temperature, controlling the inlet of the three-way valve to be communicated with the first outlet, wherein the second compressor is operated and the fluorine pump is not operated.
Under the condition that the technical scheme is adopted, the cascade heat pump system controls the second compressor and the fluorine pump to operate alternatively in a parallel mode through the second compressor and the fluorine pump, so that the condition that the second compressor is always in an operating state is effectively avoided, and further the operating energy efficiency of the cascade heat pump system is effectively improved.
Drawings
Preferred embodiments of the present application are described below with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of the structure of the cascade heat pump system of the present application;
FIG. 2 is a flow chart of the main steps of the control method of the present application;
FIG. 3 is a flowchart of the specific steps of a preferred embodiment of the control method of the present application;
reference numerals:
1. a high-pressure refrigerant circulation circuit; 11. a first compressor; 12. a first heat exchanger; 13. a first throttle member; 14. an intermediate heat exchanger; 15. a first gas separation device;
2. a low pressure refrigerant circulation circuit; 21. a second compressor; 22. a fluorine pump; 23. a second throttle member; 24. a second heat exchanger; 25. a heat exchange fan; 26. a three-way valve; 27. a solar collector; 28. a second gas separation device;
3. a bypass branch; 31. a bypass valve;
4. a heat exchange waterway.
Detailed Description
Preferred embodiments of the present application are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present application, and are not intended to limit the scope of the present application. Those skilled in the art can adapt it as desired to suit a particular application. For example, the cascade heat pump system described in the present application may be a household cascade heat pump system, or an industrial cascade heat pump system, which is not limited, and a person skilled in the art may set the application of the cascade heat pump system according to the actual use requirement. Such changes in the application do not depart from the basic principles of the application and are intended to be within the scope of the application.
It should be noted that in the description of the preferred embodiments, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying any relative importance unless explicitly specified or limited otherwise. Furthermore, the terms "coupled," "connected," and "connected" are used in a broad sense, and may be mechanically coupled, electrically coupled, directly coupled, indirectly coupled via an intervening medium, or internally coupled, and thus should not be construed as limiting the application. The specific meaning of the above terms in the present application can be understood by those skilled in the art according to the specific circumstances.
Furthermore, it should be noted that in the description of the present application, although the respective steps of the control method of the present application are described in a specific order in the present application, these orders are not limitative, but a person skilled in the art may perform the steps in a different order without departing from the basic principle of the present application.
Referring first to fig. 1, fig. 1 is a schematic structural diagram of a cascade heat pump system according to the present application. As shown in fig. 1, the cascade heat pump system of the present application comprises a high-pressure refrigerant circulation loop 1 and a low-pressure refrigerant circulation loop 2, wherein a first compressor 11, a first heat exchanger 12, a first throttling member 13 and an intermediate heat exchanger 14 are arranged on the high-pressure refrigerant circulation loop 1, a second compressor 21, a fluorine pump 22, an intermediate heat exchanger 14, a second throttling member 23 and a second heat exchanger 24 are arranged on the low-pressure refrigerant circulation loop 2, wherein the second compressor 21 and the fluorine pump 22 are arranged in parallel, and the high-pressure refrigerant circulation loop 1 and the low-pressure refrigerant circulation loop 2 are arranged to be capable of exchanging heat through the intermediate heat exchanger 14. Based on the above structure, the cascade heat pump system controls the second compressor 21 and the fluorine pump 22 to operate alternatively by the mode that the second compressor 21 and the fluorine pump 22 are arranged in parallel, so that the condition that the second compressor 21 is always in an operating state is effectively avoided, and the operating energy efficiency of the cascade heat pump system is further effectively improved.
It should be noted that, the specific types of the refrigerants flowing in the high-pressure refrigerant circulation circuit 1 and the low-pressure refrigerant circulation circuit 2 and the heat exchange sources of the first heat exchanger 12 and the second heat exchanger 24 are not limited in the present application, and can be set by a person skilled in the art according to the actual situation. As a specific embodiment, the refrigerant in the high-pressure refrigerant circulation circuit 1 is the refrigerant R134a, and the refrigerant in the low-pressure refrigerant circulation circuit 2 is the refrigerant R410A. The heat exchange source of the second heat exchanger 24 is an air source, so that the energy consumption of the cascade heat pump system is further reduced, and the operation energy efficiency is improved; specifically, the cascade heat pump system further includes a heat exchange fan 25, where the heat exchange fan 25 is disposed near the second heat exchanger 24 to improve the heat exchange effect of the air and the refrigerant in the second heat exchanger 24.
In addition, it should be noted that the specific structure of the intermediate heat exchanger 14 is not limited in the present application, and it may be a shell-and-tube heat exchanger or a plate heat exchanger, and those skilled in the art may set the heat exchanger according to the actual situation. In this embodiment, the intermediate heat exchanger 14 is preferably a plate heat exchanger to effectively improve the heat exchange efficiency of the cascade heat pump system.
Specifically, the intermediate heat exchanger 14 includes a first heat exchange channel and a second heat exchange channel, the refrigerant in the high-pressure refrigerant circulation loop 1 flows through the first heat exchange channel, the refrigerant in the low-pressure refrigerant circulation loop 2 flows through the second heat exchange channel, and the first heat exchange channel and the second heat exchange channel are staggered, so as to achieve the purpose of heat exchange between the refrigerant in the high-pressure refrigerant circulation loop 1 and the refrigerant in the low-pressure refrigerant circulation loop 2.
In addition, the specific structures and specific models of the first compressor 11, the second compressor 21, the fluorine pump 22, the first throttling member 13, the second throttling member 23, the first heat exchanger 12, and the second heat exchanger 24 are not limited in the present application; the first compressor 11 and the second compressor 21 may be variable frequency compressors or fixed frequency compressors, and preferably, the first compressor 11 and the second compressor 21 are variable frequency compressors so as to control the operation state of the cascade heat pump system; the fluorine pump 22 can be a fluorine-lined centrifugal pump, a fluorine-lined magnetic pump and a fluorine-lined self-priming pump; the first throttling member 13 and the second throttling member 23 may be electronic expansion valves, capillary tubes, or thermal expansion valves; the first heat exchanger 12 and the second heat exchanger 24 may be plate heat exchangers or shell and tube heat exchangers, which are not limitative, and may be set by those skilled in the art according to practical situations.
Further, the low-pressure refrigerant circulation circuit 2 is further provided with a three-way valve 26, the three-way valve 26 includes an inlet (a port in fig. 1) and two outlets, the inlet of the three-way valve 26 is connected to the main circuit of the low-pressure refrigerant circulation circuit 2, the first outlet (b port in fig. 1) of the three-way valve 26 is connected to the air inlet of the second compressor 21, and the second outlet (c port in fig. 1) of the three-way valve 26 is connected to the air inlet of the fluorine pump 22. The three-way valve 26 is provided so as to enable the second compressor 21 and the fluorine pump 22 to be selectively connected into the low-pressure refrigerant circulation circuit 2 by controlling the communication state thereof. When the port a and the port b of the three-way valve 26 are communicated, the second compressor 21 is connected into the low-pressure refrigerant circulation loop 2; when the port a and the port c of the three-way valve 26 are communicated, the fluorine pump 22 is connected into the low-pressure refrigerant circulation circuit 2. It should be noted that the specific structure and the specific type of the three-way valve 26 are not limited in the present application, and may be set by those skilled in the art according to the actual situation.
Preferably, a solar heat collector 27 is further provided on the low-pressure refrigerant circulation circuit 2, and the solar heat collector 27 is provided between the second throttling member 23 and the second heat exchanger 24. The solar heat collector 27 can supplement heat to the refrigerant in the low-pressure refrigerant circulation circuit 2, thereby fully utilizing renewable solar energy and further improving the operation energy efficiency of the cascade heat pump system.
Further, the cascade heat pump system further comprises a bypass branch 3, the bypass branch 3 is connected with the low-pressure refrigerant circulation loop 2, a first end of the bypass branch 3 is connected between the second throttling member 23 and the solar heat collector 27, a second end of the bypass branch 3 is connected between the solar heat collector 27 and the second heat exchanger 24, a bypass valve 31 is arranged on the bypass branch 3, and the bypass valve 31 is arranged to control the condition that the solar heat collector 27 is connected into the low-pressure refrigerant circulation loop 2 by controlling the opening and closing states of the bypass valve 31.
It should be noted that, the present application does not limit the specific structure and the specific type of the solar heat collector 27 and the bypass valve 31, and the solar heat collector 27 may be a flat plate heat collector, a condensation heat collector, or a plane mirror heat collector; the bypass valve 31 may be a hydraulic control valve or an electromagnetic control valve, which is not limited, and may be set by one skilled in the art according to the actual circumstances.
Further preferably, the cascade heat pump system further comprises a heat exchange waterway 4, wherein water in the heat exchange waterway 4 is a heat exchange source of the first heat exchanger 12; specifically, a part of the heat exchange water path 4 is disposed in the first heat exchanger 12 so that the water in the heat exchange water path 4 exchanges heat with the refrigerant in the high-pressure refrigerant circulation circuit 1 through the first heat exchanger 12.
In addition, in the present embodiment, the high-pressure refrigerant circulation circuit 1 is further provided with a first air separation device 15, and the first air separation device 15 is disposed at the air inlet of the first compressor 11. The low-pressure refrigerant circulation loop 2 is further provided with a second gas separation device 28, and the second gas separation device 28 is arranged at the gas inlet of the second compressor 21. The first air separation device 15 and the second air separation device 28 can effectively avoid the problem of liquid impact of the first compressor 11 and the second compressor 21, and effectively ensure the service lives of the first compressor 11 and the second compressor 21. It should be noted that the specific structures of the first air separation unit 15 and the second air separation unit 28 are not limited in the present application, and may be set by those skilled in the art according to the actual situation.
Further, the cascade heat pump system further includes a temperature sensor capable of acquiring an ambient temperature in the vicinity of the cascade heat pump system, an optical irradiance sensor capable of detecting an optical irradiance in the vicinity of the solar collector 27, and a controller (not shown) capable of acquiring the ambient temperature detected by the temperature sensor and the optical irradiance detected by the optical irradiance sensor, and further capable of controlling the communication state of the bypass branch 3 and the three-way valve 26, the operation states of the solar collector 27, the second compressor 21, and the fluorine pump 22, and the like, which are not limitative.
It should be noted that, the present application does not limit the specific number and positions of the temperature sensor and the irradiance sensor, so long as the present application can obtain the ambient temperature and irradiance, and those skilled in the art can set the present application according to the actual situation. In addition, it will be understood by those skilled in the art that the present application does not limit the specific structure and model of the controller, and the controller may be an original controller of the cascade heat pump system or a controller separately provided for executing the control method of the present application, and those skilled in the art may set the structure and model of the controller according to actual use requirements.
Referring next to fig. 2, fig. 2 is a flow chart of main steps of the control method of the present application. As shown in fig. 2, based on the cascade heat pump system described in the above embodiment, the control method of the present application mainly includes the following steps:
s1: acquiring irradiance;
s2: according to the irradiance and the preset irradiance, controlling the communication state of the bypass branch and the running state of the solar heat collector;
s3: acquiring outdoor environment temperature;
s4: and controlling the communication state of the three-way valve and the running states of the second compressor and the fluorine pump according to the outdoor environment temperature and the preset environment temperature.
Under the condition that the high-pressure refrigerant circulation loop 1 operates, firstly, in step S1, the controller acquires irradiance; of course, the application does not limit the specific acquisition time and the acquisition mode of the irradiance, the controller can acquire the irradiance in real time or at intervals of a certain time, which is not limitative, and the controller can be set by a person skilled in the art according to practical situations. Preferably, the controller acquires the irradiance in real time, so that the operation state of the cascade heat pump system can be timely and effectively adjusted, and the operation energy efficiency of the cascade heat pump system is further effectively improved.
Next, in step S2, the controller controls the communication state of the bypass branch 3 and the operation state of the solar collector 27 according to the irradiance and the preset irradiance.
It should be noted that, the present application does not limit the specific control manner of the controller to control the communication state of the bypass branch 3 and the operation state of the solar collector 27, the controller may compare or compare the magnitude of the irradiance with the preset irradiance, and then control the communication state of the bypass branch 3 and the operation state of the solar collector 27 according to the magnitude comparison result or the comparison result; of course, this is not limiting and can be set by the person skilled in the art according to the actual circumstances.
In addition, it should be noted that, the specific setting value of the preset irradiance is not limited, and a person skilled in the art may set the specific setting value according to the actual operation condition of the cascade heat pump system, or may obtain the specific setting value according to the actual use requirement of the user, which is not limited.
Further, in step S3, the controller acquires an outdoor ambient temperature in the vicinity of the cascade heat pump system; of course, the application does not limit the specific timing and mode of acquiring the outdoor environmental temperature, and the controller may acquire the outdoor environmental temperature in real time or at intervals, which is not limited, and may be set by a person skilled in the art according to practical situations. Preferably, the controller acquires the outdoor environment temperature in real time, so that the operation state of the cascade heat pump system can be timely and effectively adjusted, and the operation energy efficiency of the cascade heat pump system is further effectively improved.
Next, in step S4, the controller controls the communication state of the three-way valve 26 and the operation states of the second compressor 21 and the fluorine pump 22 according to the outdoor ambient temperature and the preset ambient temperature.
It should be noted that, the specific setting value of the preset environmental temperature is not limited, and a person skilled in the art may set the setting value according to the actual operation condition of the cascade heat pump system, or may obtain the setting value according to the actual use requirement of the user, which is not limited.
In addition, it should be noted that the present application also does not limit the specific control manner of the controller to control the communication state of the three-way valve 26 and the operation states of the second compressor 21 and the fluorine pump 22, and it is possible to compare or compare the outdoor ambient temperature with the preset ambient temperature, and then control the communication state of the three-way valve 26 and the operation states of the second compressor 21 and the fluorine pump 22 according to the comparison result or the comparison result.
In addition, it should be noted that the specific execution sequence of the step S1 and the step S3 is not limited in the present application, and the step S1 and the step S3 may be executed simultaneously or sequentially without being separately executed, and may be set by a person skilled in the art according to the actual situation.
Referring next to fig. 3, fig. 3 is a flowchart showing the specific steps of a preferred embodiment of the control method of the present application. As shown in fig. 3, based on the cascade heat pump system described in the above embodiment, the control method of the preferred embodiment of the present application includes the steps of:
s101: acquiring irradiance;
s102: if the irradiance is greater than or equal to the preset irradiance, the bypass branch is controlled not to be communicated and the solar collector operates;
s103: if the irradiance is smaller than the preset irradiance, the bypass branch is controlled to be communicated and the solar collector does not operate;
s104: acquiring outdoor environment temperature;
s105: if the outdoor ambient temperature is greater than or equal to the preset ambient temperature, controlling the inlet of the three-way valve to be communicated with the second outlet, wherein the second compressor does not operate and the fluorine pump operates;
s106: and if the outdoor environment temperature is less than the preset environment temperature, controlling the inlet of the three-way valve to be communicated with the first outlet, and enabling the second compressor to operate and enabling the fluorine pump not to operate.
In the case where the high-pressure refrigerant circulation circuit 1 is operated, first, in step S101, the controller acquires irradiance; of course, the application does not limit the specific acquisition time and the acquisition mode of the irradiance, the controller can acquire the irradiance in real time or at intervals of a certain time, which is not limitative, and the controller can be set by a person skilled in the art according to practical situations. Preferably, the controller acquires the irradiance in real time, so that the operation state of the cascade heat pump system can be timely and effectively adjusted, and the operation energy efficiency of the cascade heat pump system is further effectively improved.
Then, the controller controls the communication state of the bypass branch 3 and the operation state of the solar collector 27 according to the irradiance and the preset irradiance. It should be noted that, the specific setting value of the preset irradiance is not limited, and a person skilled in the art may set the specific setting value according to the actual operation condition of the cascade heat pump system, or may obtain the specific setting value according to the actual use requirement of the user, which is not limited.
Specifically, in step S102, if the irradiance is greater than or equal to the preset irradiance, the controller controls the bypass branch 3 not to communicate and the solar collector 27 to operate; at this time, the bypass valve 31 is closed, and the refrigerant in the low-pressure refrigerant circulation circuit 2 flows out of the second throttle member 23, flows through the solar heat collector 27, and flows into the second heat exchanger 24.
Further, in step S103, if the irradiance is less than the preset irradiance, the controller controls the bypass branch 3 to communicate and the solar collector 27 not to operate; at this time, the bypass valve 31 is opened, and the refrigerant in the low-pressure refrigerant circuit 2 flows out of the second throttle member 23, flows through the bypass valve 31, and flows into the second heat exchanger 24.
Further, in step S104, the controller acquires an outdoor ambient temperature in the vicinity of the cascade heat pump system; of course, the application does not limit the specific timing and mode of acquiring the outdoor environmental temperature, and the controller may acquire the outdoor environmental temperature in real time or at intervals, which is not limited, and may be set by a person skilled in the art according to practical situations. Preferably, the controller acquires the outdoor environment temperature in real time, so that the operation state of the cascade heat pump system can be timely and effectively adjusted, and the operation energy efficiency of the cascade heat pump system is further effectively improved.
Next, the controller controls the communication state of the three-way valve 26 and the operation states of the second compressor 21 and the fluorine pump 22 according to the outdoor ambient temperature and the preset ambient temperature. It should be noted that, the specific setting value of the preset environmental temperature is not limited, and a person skilled in the art may set the setting value according to the actual operation condition of the cascade heat pump system, or may obtain the setting value according to the actual use requirement of the user, which is not limited.
Specifically, in step S105, if the outdoor ambient temperature is greater than or equal to the preset ambient temperature, the controller controls the inlet (a-port) and the second outlet (c-port) of the three-way valve 26 to communicate, the second compressor 21 is not operated and the fluorine pump 22 is operated.
Further, in step S106, if the outdoor ambient temperature is less than the preset ambient temperature, the controller controls the inlet (a port) and the first outlet (b port) of the three-way valve to communicate, the second compressor 21 is operated and the fluorine pump 22 is not operated.
Based on the above arrangement, the cascade heat pump system of the present application is not operated in the second compressor 21 and the fluorine pump 22 is operated in the high temperature season; during cascade operation in low-temperature seasons, the second compressor 21 is operated, and the fluorine pump 22 is not operated, so that the operation energy efficiency of the cascade heat pump system in high-temperature working conditions can be improved, and the operation energy efficiency of the cascade heat pump system in low-temperature working conditions can be improved. In addition, when the irradiance of light is high, the solar heat collector 27 is connected into the low-pressure refrigerant circulation loop 2, so that renewable solar energy can be fully utilized, and the operation energy efficiency of the cascade heat pump system is further improved.
It should be noted that, the specific execution sequence of the step S101 and the step S104 is not limited in the present application, and the step S101 and the step S104 may be executed simultaneously or sequentially without being sequenced, which can be set by a person skilled in the art according to the actual situation. Preferably, step S101 and step S104 are performed simultaneously in order to further improve the operating energy efficiency of the cascade heat pump system.
In addition, it should be noted that the operation mode of the cascade heat pump system of the present application is not limited to the above-mentioned case, and a person skilled in the art may set the operation mode of the cascade heat pump system according to the actual situation; it will be appreciated by those skilled in the art that changes in the specific operating modes of the cascade heat pump system do not depart from the basic principles of the application and still fall within the scope thereof.
Thus far, the technical solution of the present application has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present application is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present application, and such modifications and substitutions will fall within the scope of the present application.
Claims (10)
1. A cascade heat pump system is characterized in that the cascade heat pump system comprises a high-pressure refrigerant circulation loop and a low-pressure refrigerant circulation loop,
the high-pressure refrigerant circulation loop is provided with a first compressor, a first heat exchanger, a first throttling component and an intermediate heat exchanger,
the low-pressure refrigerant circulation loop is provided with a second compressor, a fluorine pump, the intermediate heat exchanger, a second throttling component and a second heat exchanger, wherein the second compressor and the fluorine pump are arranged in parallel,
the high-pressure refrigerant circulation loop and the low-pressure refrigerant circulation loop are arranged to be capable of exchanging heat through the intermediate heat exchanger.
2. The cascade heat pump system of claim 1, wherein the low-pressure refrigerant circulation circuit is further provided with a three-way valve,
the three-way valve comprises an inlet and two outlets, the inlet of the three-way valve is connected with the main path of the low-pressure refrigerant circulation loop, the first outlet of the three-way valve is connected with the air inlet of the second compressor, and the second outlet of the three-way valve is connected with the air inlet of the fluorine pump.
3. The cascade heat pump system of claim 1, wherein a solar heat collector is further disposed on the low pressure refrigerant circulation loop, the solar heat collector being disposed between the second throttle member and the second heat exchanger.
4. The cascade heat pump system of claim 3, further comprising a bypass branch,
the bypass branch is connected with the low-pressure refrigerant circulation loop, the first end of the bypass branch is connected between the second throttling component and the solar heat collector, the second end of the bypass branch is connected between the solar heat collector and the second heat exchanger,
the bypass branch is provided with a bypass valve, and the bypass valve is arranged to control the condition that the solar heat collector is connected into the low-pressure refrigerant circulation loop by controlling the opening and closing states of the bypass valve.
5. The cascade heat pump system of any of claims 1-4, further comprising a heat exchange waterway,
and a part of the heat exchange waterway is arranged in the first heat exchanger so that water in the heat exchange waterway exchanges heat with the refrigerant in the high-pressure refrigerant circulation loop through the first heat exchanger.
6. The cascade heat pump system according to any one of claims 1-4, further comprising a first gas separation device disposed on the high-pressure refrigerant circulation circuit, the first gas separation device being disposed at a gas inlet of the first compressor.
7. The cascade heat pump system according to any one of claims 1-4, wherein a second gas separation device is further provided on the low-pressure refrigerant circulation circuit, the second gas separation device being provided at a gas inlet of the second compressor.
8. A control method of a cascade heat pump system is characterized in that the cascade heat pump system comprises a high-pressure refrigerant circulation loop and a low-pressure refrigerant circulation loop,
the high-pressure refrigerant circulation loop is provided with a first compressor, a first heat exchanger, a first throttling component and an intermediate heat exchanger,
the low-pressure refrigerant circulation loop is provided with a second compressor, a fluorine pump, the intermediate heat exchanger, a second throttling component and a second heat exchanger, wherein the second compressor and the fluorine pump are arranged in parallel,
the high-pressure refrigerant circulation loop and the low-pressure refrigerant circulation loop are arranged to be capable of exchanging heat through the intermediate heat exchanger,
the low-pressure refrigerant circulation loop is also provided with a three-way valve, the three-way valve comprises an inlet and two outlets, the inlet of the three-way valve is connected with the main path of the low-pressure refrigerant circulation loop, the first outlet of the three-way valve is connected with the air inlet of the second compressor, the second outlet of the three-way valve is connected with the air inlet of the fluorine pump,
the low-pressure refrigerant circulation loop is also provided with a solar heat collector which is arranged between the second throttling component and the second heat exchanger,
the cascade heat pump system further comprises a bypass branch, wherein a first end of the bypass branch is connected between the second throttling component and the solar heat collector, a second end of the bypass branch is connected between the solar heat collector and the second heat exchanger, and a bypass valve is arranged on the bypass branch;
under the condition that the high-pressure refrigerant circulation loop operates, the control method comprises the following steps:
acquiring irradiance;
controlling the communication state of the bypass branch and the operation state of the solar heat collector according to the irradiance and the preset irradiance;
acquiring outdoor environment temperature;
and controlling the communication state of the three-way valve and the running states of the second compressor and the fluorine pump according to the outdoor environment temperature and the preset environment temperature.
9. The control method according to claim 8, wherein the step of controlling the communication state of the bypass branch and the operation state of the solar collector according to the irradiance of light and the preset irradiance of light specifically includes:
if the irradiance is greater than or equal to the preset irradiance, controlling the bypass branch not to be communicated and the solar collector to operate;
and if the irradiance is smaller than the preset irradiance, controlling the bypass branch to be communicated and the solar heat collector not to operate.
10. The control method according to claim 8, wherein the step of controlling the communication state of the three-way valve and the operation states of the second compressor and the fluorine pump according to the outdoor ambient temperature and the preset ambient temperature specifically includes:
if the outdoor ambient temperature is greater than or equal to the preset ambient temperature, controlling the inlet of the three-way valve to be communicated with a second outlet, wherein the second compressor is not operated and the fluorine pump is operated;
and if the outdoor environment temperature is smaller than the preset environment temperature, controlling the inlet of the three-way valve to be communicated with the first outlet, wherein the second compressor is operated and the fluorine pump is not operated.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210470619.3A CN117006720A (en) | 2022-04-28 | 2022-04-28 | Cascade heat pump system and control method thereof |
| PCT/CN2022/138380 WO2023207126A1 (en) | 2022-04-28 | 2022-12-12 | Cascade heat pump system and control method therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210470619.3A CN117006720A (en) | 2022-04-28 | 2022-04-28 | Cascade heat pump system and control method thereof |
Publications (1)
| Publication Number | Publication Date |
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| CN117006720A true CN117006720A (en) | 2023-11-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210470619.3A Pending CN117006720A (en) | 2022-04-28 | 2022-04-28 | Cascade heat pump system and control method thereof |
Country Status (2)
| Country | Link |
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| CN (1) | CN117006720A (en) |
| WO (1) | WO2023207126A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117502249B (en) * | 2024-01-04 | 2024-03-29 | 华北理工大学 | Heat pump coupling system for heating animal house and heating method |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101280976A (en) * | 2008-05-30 | 2008-10-08 | 天津商业大学 | CO2/NH3 combined refrigeration system |
| KR101873595B1 (en) * | 2012-01-10 | 2018-07-02 | 엘지전자 주식회사 | A cascade heat pump and a driving method for the same |
| US10101060B2 (en) * | 2014-07-31 | 2018-10-16 | Carrier Corporation | Cooling system |
| CN108662811A (en) * | 2018-03-16 | 2018-10-16 | 广州德能热源设备有限公司 | Air-source overlapping type heat pump device |
| CN210663434U (en) * | 2019-10-29 | 2020-06-02 | 田铭 | Space energy high-temperature heat pump overlapping machine system |
-
2022
- 2022-04-28 CN CN202210470619.3A patent/CN117006720A/en active Pending
- 2022-12-12 WO PCT/CN2022/138380 patent/WO2023207126A1/en unknown
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| WO2023207126A1 (en) | 2023-11-02 |
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