CN114543385A - Multi-mode heat pump system and control method thereof - Google Patents
Multi-mode heat pump system and control method thereof Download PDFInfo
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- CN114543385A CN114543385A CN202111668407.8A CN202111668407A CN114543385A CN 114543385 A CN114543385 A CN 114543385A CN 202111668407 A CN202111668407 A CN 202111668407A CN 114543385 A CN114543385 A CN 114543385A
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- 238000000034 method Methods 0.000 title claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 153
- 238000010438 heat treatment Methods 0.000 claims abstract description 91
- 239000007788 liquid Substances 0.000 claims abstract description 53
- 238000004378 air conditioning Methods 0.000 claims description 41
- 238000005057 refrigeration Methods 0.000 claims description 32
- 238000001514 detection method Methods 0.000 claims description 20
- 230000009977 dual effect Effects 0.000 claims description 18
- 238000004891 communication Methods 0.000 claims description 14
- 238000001816 cooling Methods 0.000 claims description 14
- 238000012806 monitoring device Methods 0.000 claims description 14
- 230000009471 action Effects 0.000 claims description 10
- 230000000875 corresponding effect Effects 0.000 claims description 5
- 230000008878 coupling Effects 0.000 abstract 1
- 238000010168 coupling process Methods 0.000 abstract 1
- 238000005859 coupling reaction Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 13
- 230000008569 process Effects 0.000 description 6
- 238000010257 thawing Methods 0.000 description 6
- 239000000047 product Substances 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- 238000004590 computer program Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000002457 bidirectional effect Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
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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
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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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
- F24D15/00—Other domestic- or space-heating systems
- F24D15/04—Other domestic- or space-heating systems using heat pumps
-
- 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
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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
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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
- F25B41/40—Fluid line arrangements
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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
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/006—Accumulators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/12—Hot water central heating systems using heat pumps
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- Combustion & Propulsion (AREA)
- Analytical Chemistry (AREA)
- Power Engineering (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The invention belongs to the technical field of heat pumps, and particularly relates to a multi-mode heat pump system and a control method thereof. The water supply circuit in this scheme forms parallel mode with the heating return circuit, and the water supply circuit switches on the module through the switching-over with the heating return circuit and communicates with the liquid storage pot, switches on the function through the switching-over of switching-over module, and the working medium can the switching-over circulate in the heating return circuit to realize multi-mode operation, such tube coupling is comparatively simple, and efficiency is higher.
Description
Technical Field
The invention belongs to the technical field of heat pumps, and particularly relates to a multi-mode heat pump system and a control method thereof.
Background
Along with the improvement of living standard and the improvement of energy-saving and environment-friendly consciousness of people, an air energy dual-combined heat pump product and an air energy water heater product are favored by people; as an energy-saving product which is focused in the future country, the heat pump product with two combined supplies is mainly applied to meet the cooling and heating requirements of indoor heating in winter and cooling in summer, and at the moment, a set of air energy water heater needs to be configured for daily life hot water, so that the problems of large installation floor area and high initial investment cost are caused; meanwhile, when the air energy water heater operates at low temperature in winter, the heating capacity of the air energy water heater is attenuated, and daily life hot water in winter is difficult to ensure; in addition, in the current market, a small part of projects still adopt an air-conditioning heating hot water integrated heat pump scheme, the temperature pressure fluctuation of a mode switching system is large, meanwhile, the number of system valves is large, the control logic is complex, the reliability and the stability are poor, and the user experience is seriously influenced.
In order to solve the technical problems, the prior art scheme discloses an omnibearing multi-mode hybrid working heat pump system which can realize various combinations of heat supply, water refrigeration and hot water production; however, a plurality of heat exchangers are needed, so that the pipeline of the whole system is too complex, and the cost is correspondingly increased; in addition, in the specific implementation process, the series mode is difficult to control the temperature, and the energy waste is more and is not economical.
Disclosure of Invention
The present invention overcomes at least one of the above-mentioned drawbacks of the prior art and provides a multi-mode heat pump system and a control method thereof, which can realize a plurality of supply modes by only using two heat exchangers, and the system piping and corresponding control logic are relatively simple.
In order to solve the technical problems, the invention adopts the technical scheme that:
the utility model provides a multi-mode heat pump system, including the compressor module, the first heat exchanger, the second heat exchanger, third heat exchanger and four-way valve, the first heat exchanger communicates and is provided with hot water module, the third heat exchanger communicates and is provided with air conditioner heating module, the compressor module is with the first heat exchanger, second heat exchanger circulation intercommunication, the compressor module still with the third heat exchanger, second heat exchanger circulation intercommunication, still include switching-over switch-on module and liquid storage pot, first choke valve, switching-over switch-on module includes input module and output module, the exit end of input module links to each other with the entry end of liquid storage pot, the entry end of output module links to each other with the exit end of liquid storage pot through first choke valve, the entry end of input module and the exit end of output module are equallyd divide and are linked together with the exit end of second heat exchanger, the exit end of third heat exchanger respectively; the compressor module is circularly communicated with the first heat exchanger, the liquid storage tank, the first throttle valve, the reversing conduction module, the second heat exchanger and the four-way valve to form a water supply loop, and the compressor module is circularly communicated with the four-way valve, the third heat exchanger, the reversing conduction module, the liquid storage tank, the first throttle valve, the reversing conduction module and the second heat exchanger to form a heating loop.
The water supply loop and the heating loop in the scheme form a parallel connection mode, the water supply loop and the heating loop are communicated with the liquid storage tank through the reversing conduction module, and the working medium can be reversed and circulated in the heating loop through the reversing conduction function of the reversing conduction module, so that multi-mode operation is realized, and the pipeline connection is simple; because water supply circuit and heating return circuit are parallelly connected mode, when operation hot water refrigeration duplex mode, first heat exchanger absorbs the heat of working medium with the second heat exchanger simultaneously for low temperature working medium gets into and exchanges heat with air conditioner heating module in the third heat exchanger, and the working medium absorbs the heat and refrigerates, and then when realizing duplex mode, has reduced the energy consumption of system, has important economic meaning.
Preferably, a first temperature monitoring device is arranged in the hot water module, and a second temperature monitoring device is arranged in the air-conditioning heating module.
Preferably, the input module comprises two first check valves and a first joint, the second heat exchanger and the third heat exchanger are respectively communicated with one ends of the two first check valves, the other ends of the two first check valves are communicated with the inlet end of the first joint, and the outlet end of the first joint is communicated with the inlet end of the liquid storage tank; the output module comprises two second one-way valves and a second connector, the second heat exchanger and the third heat exchanger are respectively communicated with one ends of the two second one-way valves, the other ends of the two second one-way valves are communicated with the outlet end of the second connector, and the inlet end of the second connector is communicated with the outlet end of the liquid storage tank.
Preferably, a first detection device for detecting flow is arranged between the input end of the water supply module and the first heat exchanger in a communication manner; and a second detection device for detecting flow is communicated between the input end of the air-conditioning heating module and the third heat exchanger.
Preferably, a first switch assembly is further arranged between the outlet end of the compressor module and the first heat exchanger in a communicating manner, and a second switch assembly is further arranged between the outlet end of the compressor module and the four-way valve in a communicating manner.
Preferably, still including the intercommunication set up the enthalpy module that increases between liquid storage pot output and first choke valve, the enthalpy module still is linked together with the compressor module.
Preferably, the enthalpy increasing module comprises an intermediate heat exchanger, a second throttle valve and a third joint, and the output end of the liquid storage tank is communicated with the intermediate heat exchanger, the third joint and the second throttle valve to form a fourth loop; the third joint is communicated with the second throttling valve and the intermediate heat exchanger to form a fifth loop; the output end of the intermediate heat exchanger is also communicated with the compressor module.
Preferably, a first switch assembly is further communicated and arranged between the output end of the compressor module and the first heat exchanger, and a second switch assembly is further communicated and arranged between the output end of the compressor module and the D port of the four-way valve.
Preferably, the multi-mode heat pump system described above is further provided with a control module for controlling the multi-mode heat pump system.
The technical scheme also provides a control method applied to the multi-mode heat pump system, and the control method controls the multi-mode heat pump system to realize the hot water refrigeration double working condition and the hot water heating double working condition;
the hot water refrigeration dual working condition specifically comprises the following steps:
s1: presetting a first set temperature T1 and a second set temperature T2;
s2: setting a first frequency and acquiring a first actual temperature t1 of the hot water module and a second actual temperature t2 of the air-conditioning heating module according to the first frequency;
s3: judging whether the first actual temperature T1 is less than a first set temperature T1 and whether the second actual temperature T2 is greater than a second set temperature T2, if so, executing a hot water refrigeration double working condition, and if not, stopping the hot water refrigeration double working condition;
the hot water heating double working condition specifically comprises the following steps:
s10: presetting a third set temperature T3 and a fourth set temperature T4;
s20: setting a second frequency, and acquiring a third actual temperature t3 of the hot water module and a fourth actual temperature t4 of the air-conditioning heating module according to the second frequency;
s30: and judging whether the third actual temperature T3 is less than the third set temperature T3 and whether the fourth actual temperature T4 is less than the fourth actual temperature, if so, executing a hot water heating double working condition, and if not, stopping the hot water heating double working condition.
Preferably, the step S3 of executing the hot water refrigeration dual mode specifically further includes the following steps:
s31: sequentially starting the air-conditioning heating module, the second detection device and the second switch assembly;
s32: the four-way valve is electrified, a port D of the four-way valve is communicated with a port E, and a port S of the four-way valve is communicated with a port C;
s33: sequentially opening the first throttle valve and the second heat exchanger;
s34: sequentially starting the hot water module, the first switch assembly and the first detection device;
s35: starting a compressor module;
the step S30 of executing the hot water heating dual condition specifically includes the following steps:
s301: sequentially starting the hot water module, the first switch assembly and the first detection device;
s302: sequentially starting the air-conditioning heating module, the second detection device and the second switch assembly;
s303: the four-way valve is powered off, a port D of the four-way valve is communicated with a port C, and a port E of the four-way valve is communicated with a port S;
s304: sequentially opening the first throttle valve and the second heat exchanger;
s305: and starting the compressor module.
Preferably, the step S3 of executing the hot water cooling dual mode specifically further includes the step S36: judging whether the first actual temperature T1 is greater than or equal to the first set temperature T1 again, if so, closing the hot water module and the first switch assembly, otherwise, not executing the action; and judging whether the second actual temperature T2 is less than the second set temperature T2, if so, closing the air-conditioning heating module and the second switch assembly, and if not, not executing corresponding actions.
Preferably, after the air-conditioning heating module and the second switching element are turned off in step S36, the compressor module is restarted after the compressor module is paused for the first time period.
Preferably, the step S30 further includes the step S306: judging whether the third actual temperature T3 is greater than or equal to the first set temperature T1 again, if so, closing the hot water module and the first switch assembly, otherwise, not executing the action; and judging whether the fourth actual temperature T4 is greater than the third set temperature T3, if so, turning off the air-conditioning heating module and the second switch assembly, and if not, not executing the action.
Preferably, before the above step S34 is started, it is determined whether the second actual temperature T2 is less than or equal to the second set temperature T2, if yes, the step S34 is performed, and if no, the step S34 is not performed; before step S304 begins, it is determined whether the third actual temperature t3 is less than or equal to the first set temperature, if yes, step S304 is performed, otherwise, step S304 is not performed.
Compared with the prior art, the beneficial effects are:
according to the invention, the hot water loop and the heating loop are arranged in parallel, when the hot water refrigeration double working conditions are operated, the first heat exchanger is used for cooling the working medium when the hot water refrigeration working condition is operated, and the cooled working medium is applied to the refrigeration working condition of the second heat exchanger, so that the refrigeration efficiency can be improved, the energy utilization rate is improved, and the energy consumption of the system is reduced; meanwhile, the liquid storage tank and the reversing conduction module are utilized, so that the complexity of pipeline connection of the system can be greatly reduced, and the use cost is reduced.
Drawings
Fig. 1 is a schematic view of the overall configuration of a multimode heat pump system according to embodiment 1 of the present invention;
fig. 2 is a schematic structural diagram of a reversing conducting module of a multi-mode heat pump system according to embodiment 1 of the present invention;
fig. 3 is a schematic structural view of an air-conditioning heating module of the multi-mode heat pump system according to embodiment 1 of the present invention;
fig. 4 is a schematic view of the overall structure of a multi-mode heat pump system according to embodiment 2 of the present invention;
FIG. 5 is a schematic structural diagram of an enthalpy increasing module of the multi-mode heat pump system according to embodiment 2 of the present invention;
fig. 6 is a schematic view of the overall structure of a multi-mode heat pump system according to embodiment 3 of the present invention;
FIG. 7 is a logic block diagram of the hot water refrigeration dual-condition control method of the multi-mode heat pump system according to embodiment 4 of the present invention;
FIG. 8 is a logic block diagram of a hot water heating dual-condition control method of the multi-mode heat pump system according to embodiment 4 of the present invention;
FIG. 9 is a schematic diagram of the flow direction of the hot water refrigeration dual-working-condition working medium in the control method of the multi-mode heat pump system in embodiment 4 of the present invention;
FIG. 10 is a schematic diagram of the working fluid flow direction of the hot water in the control method of the multi-mode heat pump system in embodiment 4 of the invention;
FIG. 11 is a schematic flow diagram of working media in the refrigeration condition according to the control method of the multi-mode heat pump system in embodiment 4 of the present invention;
FIG. 12 is a schematic diagram of the working fluid flow direction in the heating condition of the control method of the multi-mode heat pump system in embodiment 4 of the present invention;
FIG. 13 is a schematic flow diagram of a working medium in a dual working condition for hot water heating and warming according to the control method of the multi-mode heat pump system in embodiment 4 of the present invention;
wherein the arrows indicate the direction of the working medium or the water flow or the judgment logic.
Detailed Description
The drawings are for illustration purposes only and are not to be construed as limiting the invention; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the invention.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "long", "short", etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the drawings, it is only for convenience of description and simplicity of description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationships in the drawings are only used for illustrative purposes and are not to be construed as limitations of the present patent, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
The technical scheme of the invention is further described in detail by the following specific embodiments in combination with the attached drawings:
example 1:
as shown in fig. 1 to 3, an embodiment 1 of a multi-mode heat pump system includes a compressor module 100, a first heat exchanger 200, a second heat exchanger 300, a third heat exchanger 400 and a four-way valve 700, the first heat exchanger 200 is provided with a hot water module 500 in communication, the third heat exchanger 400 is provided with an air-conditioning heating module 600 in communication, the compressor module 100 is in circulation communication with the first heat exchanger 200 and the second heat exchanger 300, the compressor module 100 is also in circulation communication with the third heat exchanger 400 and the second heat exchanger 300, the multi-mode heat pump system further includes a reverse conducting module 1, a liquid storage tank 2 and a first throttle valve 3, the reverse conducting module 1 includes an input module and an output module, an outlet end of the input module is connected with an inlet end of the liquid storage tank 2, an inlet end of the output module is connected with an outlet end of the liquid storage tank 2 through the first throttle valve 3, an inlet end of the input module and an outlet end of the output module are respectively connected with an outlet end of the second heat exchanger 300, The outlet ends of the third heat exchangers 400 are communicated; the compressor module 100 is in circulating communication with the first heat exchanger 200, the liquid storage tank 2, the first throttle valve 3, the reversing conduction module 1, the second heat exchanger 300 and the port E and the port S of the four-way valve 700 to form a water supply loop, and the compressor module 100 is in circulating communication with the port D and the port C of the four-way valve 700, the third heat exchanger 400, the reversing conduction module 1, the liquid storage tank 2, the first throttle valve 3, the reversing conduction module 1, the second heat exchanger 3 and the port E and the port S of the four-way valve 700 to form a heating loop.
The hot water module 500 comprises a water tank 502, the water tank 502 is circularly communicated with the first heat exchanger 200 through a first pipeline 503, a first circulating pump 504 for pumping water in the water tank 502 into the first heat exchanger 200 is arranged on the first pipeline 503, and the water tank 502 is provided with a water inlet 505 for connecting a water source and a water outlet 506 for outputting domestic water; the water tank 502 is well known to those skilled in the art, and it is generally necessary to make a corresponding piping design so that cold water input from a water source is continuously circulated to exchange heat with the first heat exchanger 200, the temperature of water in the water tank 502 is gradually increased, and then the water is output through the water outlet 506, and the specific principle will not be described in detail herein.
In addition, a first switch assembly 201 is further communicated between the outlet end of the compressor module 100 and the first heat exchanger 200, and a second switch assembly 701 is further communicated between the outlet end of the compressor module 100 and the four-way valve 700. In this way, the on/off of the water supply circuit and the heating circuit can be controlled by the first switch module 201 and the second switch module 701, respectively, so that the switching of the plurality of operation modes can be realized.
As shown in fig. 3, the air-conditioning heating module 600 in this embodiment includes a fan coil 601, a floor heating coil 602, a radiator 603, a buffer water tank 604, a differential pressure bypass valve 605, a safety valve 606, and an expansion tank 607, the buffer water tank 604 is circularly communicated with the third heat exchanger 400 through a second pipeline 608, the second pipeline 608 is provided with a second circulation pump 609 for pumping circulating water into the buffer water tank 604, the fan coil 601, the floor heating coil 602, and the radiator 603 are all circularly communicated with the buffer water tank 604, the differential pressure bypass valve 605 is arranged at an output end of the buffer water tank 604, the safety valve 606 is communicated with the buffer water tank 604, and output ends of the fan coil 601, the floor heating coil 602, and the radiator 603 flow back to the buffer water tank 604 after passing through the expansion tank 607; the buffer water tank 604 is further connected to an external water source to supplement circulating water to the buffer water tank 604 for the air-conditioning heating module 600 to perform a circulating operation.
In addition, the second heat exchanger 300 in this embodiment is a fin heat exchanger, and can be used to realize heat exchange between the working medium and the air.
As shown in fig. 2, the reversing conduction module 1 in this embodiment includes an input module and an output module, the input module includes two first check valves 11 and a first joint 12, the second heat exchanger 300 and the third heat exchanger 400 are respectively communicated with one end of the two first check valves 11, the other ends of the two first check valves 11 are both communicated with an inlet end of the first joint 12, and an outlet end of the first joint 12 is communicated with an inlet end of the liquid storage tank 2; the output module comprises two second one-way valves 13 and a second joint 14, the second heat exchanger 300 and the third heat exchanger 400 are respectively communicated with one ends of the two second one-way valves 13, the other ends of the two second one-way valves 13 are communicated with the outlet end of the second joint 14, and the inlet end of the second joint 14 is communicated with the outlet end of the liquid storage tank 2.
The first joint 12 and the second joint 14 are both three-way joints, and the first check valve 11 and the second check valve 13 are both in one-way conduction by means of pressures at two ends, so that the flow direction of the first throttle valve 3 is unchanged in various modes, and the complexity of a system pipeline is reduced. The liquid storage tank 2, the second heat exchanger 300 and the third heat exchanger 400 which are communicated through the input module and the output module can realize various circulation modes of working media, reduce the use of system pipelines and the complexity of a system, and the one-way valve is controlled in a physical mode by utilizing a pressure principle to conduct in a one-way mode, so that the control logic of the system can be simplified to the greatest extent, and the stability of the system is further improved.
The liquid storage tank 2 in this embodiment is a three-way liquid storage tank, which is provided with two input pipes and an output pipe, the output pipe is communicated with the first throttle valve 3, one input pipe is communicated with the output end of the first heat exchanger 200, and the other input pipe is communicated with the first joint 12 in the output module of the reversing conduction module 1.
Because the working medium exchanged heat by the first heat exchanger 200 or the second heat exchanger 300 can not be completely changed into liquid, the working medium input into the liquid storage tank 2 is in a gas-liquid mixed state, after the gas-liquid mixed working medium enters the liquid storage tank 2, the liquid working medium can be settled at the bottom of the liquid storage tank 2, and the gaseous working medium floats at the top of the liquid storage tank 2; in order to ensure that the liquid working medium can flow out of the liquid storage tank 2, in the embodiment, the output pipe of the liquid storage tank 2 extends into the bottom of the liquid storage tank 2, but a certain gap is reserved between the output pipe and the bottom of the liquid storage tank 2, so that the liquid working medium at the bottom of the liquid storage tank 2 can enter the first throttle valve 3 through the output pipe to be depressurized, and the liquid working medium is evaporated into a gas state under low pressure and then flows into the second heat exchanger 300 or the third heat exchanger 400 to perform heat exchange at the next stage.
In this embodiment, a first filter 15 is further disposed between the reversing conducting module 1 and the second heat exchanger 300, and a second filter 16 is further disposed between the reversing conducting module 1 and the third heat exchanger 400. The first filter 15 and the second filter 16 can filter the working medium, and the working medium is prevented from being blocked in the one-way valve.
A first detection device 4 for detecting flow is arranged between the input end of the water supply module and the first heat exchanger 200 in the embodiment in a communication manner; a second detection device 5 for detecting flow is arranged between the input end of the air-conditioning heating module 600 and the third heat exchanger 400. By the first detection means 4; the second detection device 5 can detect the flow assurance system of circulating water in the air-conditioning heating module 600 and operate under safe flow, and avoid the water flow in the air-conditioning heating module 600 to hang down excessively or no water flow and lead to the system temperature too high or low, influence system security.
In this embodiment, the hot water module 500 is provided with a first temperature monitoring device 501, a second temperature monitoring device 6 is provided between the third heat exchanger 400 and the second detection device 5, and the second heat exchanger 300 is provided with a third temperature monitoring device 301. Therefore, the temperature of each component of the system can be monitored in real time, and a proper control action can be made.
In this embodiment, a first switch assembly 201 is further disposed between the output end of the compressor module 100 and the first heat exchanger 200, and a second switch assembly 701 is further disposed between the output end of the compressor module 100 and the port 700D of the four-way valve. Specifically, the first switch component 201 and the second switch component 701 are two-way valves, and thus whether the compressor module 100 is connected with the first loop or the second loop is controlled by the first switch component 201 and the second switch component 701, so that a hot water module 500 in the system can be controlled to operate to provide a hot water working condition or an air-conditioning heating module 600 to operate to provide a cooling working condition or a heating working condition, or the hot water module 500 and the air-conditioning heating module 600 operate simultaneously to provide a hot water cooling working condition or a hot water cooling working condition.
The embodiment also comprises a control module for controlling the operation of the system, and the control module is used for realizing the automatic control of the system.
Example 2:
as shown in fig. 4 and fig. 5, an embodiment 2 of the multi-mode heat pump system is shown, and the difference between the present embodiment and the embodiment 1 is only that the present embodiment further includes an enthalpy increasing module 800 disposed between the output end of the liquid storage tank 2 and the first throttle 3, and the enthalpy increasing module 800 is further communicated with the compressor module 100.
As shown in fig. 5, specifically, the enthalpy increasing module 800 includes an intermediate heat exchanger 801, a second throttle valve 802, and a third joint 803, and an output end of the liquid storage tank 2 is communicated with the intermediate heat exchanger 801, the third joint 803, and the second throttle valve 802 to form a fourth loop; the third joint 803 is communicated with the second throttling valve 802 and the intermediate heat exchanger 801 to form a fifth loop; the output end of the intermediate heat exchanger 801 is also communicated with the compressor module 100; therefore, the heating and refrigerating capacity energy efficiency of the system can be improved, the water outlet temperature of the hot water module 500 can be integrally improved, and the system can be ensured to operate at the ultralow environmental temperature.
In addition, a fourth temperature monitoring device 804 is provided between the second throttle valve 802 and the intermediate heat exchanger 801, and a fifth temperature monitoring device 805 is provided between the intermediate heat exchanger 801 and the compressor module 100. In this way, the system can control the operation of the enthalpy increasing module 800 according to the temperature information obtained by the fourth temperature monitoring device 804 and the fifth temperature monitoring device 805.
Example 3
As shown in fig. 6, an embodiment 3 of a multi-mode heat pump system is shown, and the difference between this embodiment and embodiment 1 or embodiment 2 is that a bidirectional liquid storage heat exchanger 900 is adopted in this embodiment to replace the first heat exchanger 200 and the liquid storage tank 2 as a whole; specifically, the bidirectional liquid storage heat exchanger 900 is provided with a first input port 901 for communicating with the compressor module 100, a second input port 902 for communicating with the input module in the commutation conduction module 1, and an output port 903 for communicating with the output module in the commutation conduction module 1 or communicating with the enthalpy increasing module 800. Therefore, the occupied space of the system can be further reduced, and meanwhile, the working medium flow channel is large, the scaling resistance and dirty blocking resistance are high, and the heat exchange efficiency is higher.
Example 4:
fig. 7 to 13 show a first embodiment of a control method of a multi-mode heat pump system to which the multi-mode heat pump system of embodiment 1 or embodiment 2 or embodiment 3 is applied, but, to implement automatic control, the multi-mode heat pump system should further include a control module, and the control method controls the multi-mode heat pump system to implement a hot water cooling dual-condition and a hot water heating dual-condition;
the hot water refrigeration dual working condition specifically comprises the following steps:
s1: presetting a first set temperature T1 and a second set temperature T2;
s2: setting a first frequency and acquiring a first actual temperature t1 of the hot water module 500 and a second actual temperature t2 of the air-conditioning heating module 600 according to the first frequency;
s3: judging whether the first actual temperature T1 is less than a first set temperature T1 and whether the second actual temperature T2 is greater than a second set temperature T2, if so, executing a hot water refrigeration double working condition, and if not, stopping the hot water refrigeration double working condition;
the hot water heating double working condition specifically comprises the following steps:
s10: presetting a third set temperature T3 and a fourth set temperature T4;
s20: setting a second frequency, and acquiring a third actual temperature t3 of the hot water module 500 and a fourth actual temperature t4 of the air-conditioning heating module 600 according to the second frequency;
s30: and judging whether the third actual temperature T3 is less than the third set temperature T3 and whether the fourth actual temperature T4 is less than the fourth actual temperature, if so, executing a hot water heating double working condition, and if not, stopping the hot water heating double working condition.
In a specific embodiment, T1 ═ T3, T4 < T2, T4 ranges from 5 to 8 ℃, T1 ranges from 38 to 42 ℃, and T2 ranges from 22 to 26 ℃.
In this embodiment, the step S3 of executing the hot water refrigeration dual operating mode specifically further includes the following steps:
s31: the air-conditioning heating module 600, the second detection device 5 and the second switch component 701 are started in sequence;
s32: the four-way valve 700 is electrified, the port D of the four-way valve 700 is communicated with the port E, and the port S is communicated with the port C;
s33: the first throttle valve 3 and the second heat exchanger 300 are opened in sequence;
s34: the hot water module 500, the first switch assembly 201 and the first detection device 4 are started in sequence;
s35: starting the compressor module 100;
the compressor module 100 compresses the working medium into a high-pressure gaseous working medium, the high-pressure gaseous working medium enters the second heat exchanger 300 after entering the port D and the port E of the four-way valve 700 through the second switch component 701 and enters the first heat exchanger 200 through the first switch component 201, the high-pressure gaseous working medium exchanges heat with air in the second heat exchanger 300 and exchanges heat with the hot water module in the first heat exchanger 200 to form a high-temperature high-pressure gaseous working medium, the high-temperature high-pressure gaseous working medium enters the liquid storage tank 2 through the input module of the reversing conduction module 1, after the high-temperature high-pressure gaseous working medium is depressurized by the first throttle valve 3 to form a high-temperature medium-pressure gaseous working medium, the high-temperature medium-pressure gaseous working medium enters the third heat exchanger 400 through the output module of the reversing conduction module 1 to exchange heat with the air-conditioning heating module 600 to form a medium-temperature medium-pressure gaseous working medium, and the medium-temperature medium-pressure gaseous working medium flows back to the compressor module 100 through the port C and the port S of the four-way valve 700. Thus, in summer, the user can use hot water while using cold air; because the hot water refrigeration double working conditions of the system run simultaneously, the first heat exchanger 200 and the second heat exchanger 300 absorb the heat of the working medium simultaneously, and the temperature of the working medium is reduced rapidly, so that the refrigeration efficiency can be improved; in addition, in the process of heat exchange of the first heat exchanger 200, cold water in the water tank 502 is heated instead of radiating heat to air, so that the energy can be fully utilized, the energy utilization rate is improved, and the energy consumption of the system is reduced.
In the present embodiment, the execution of the hot water heating dual operating condition in step S30 specifically includes the following steps:
s301: the hot water module 500, the first switch assembly 201 and the first detection device 4 are started in sequence;
s302: the air-conditioning heating module 600, the second detection device 5 and the second switch component 701 are started in sequence;
s303: the four-way valve 700 is powered off, the port D of the four-way valve 700 is communicated with the port C, and the port E is communicated with the port S;
s304: the first throttle valve 3 and the second heat exchanger 300 are opened in sequence;
s305: the compressor module 100 is turned on.
In this embodiment, the step S3 of executing the hot water refrigeration dual operating mode specifically further includes the step S36: judging whether the first actual temperature T1 is greater than or equal to the first set temperature T1 again, if so, closing the hot water module 500 and the first switch assembly 201, and switching the system to a refrigeration working condition, otherwise, not executing the action; and judging whether the second actual temperature T2 is lower than a second set temperature T2, if so, closing the air-conditioning heating module 600 and the second switch component 701, switching the system to a hot water working condition, and if not, not executing corresponding actions.
In this embodiment, after the air-conditioning heating module 600 and the second switch component 701 are turned off in step S36, the compressor module 100 is restarted after the first time period is suspended. So as to avoid the damage caused by overlarge pressure fluctuation in the system and realize the protection of the system.
In this embodiment, step S30 further includes step S306: judging whether the third actual temperature T3 is greater than or equal to the first set temperature T1 again, if so, closing the hot water module 500 and the first switch assembly 201, switching the system to a heating working condition, and if not, not executing the action; and judging whether the fourth actual temperature T4 is greater than the third set temperature T3, if so, turning off the air-conditioning heating module 600 and the second switch component 701, switching the system to a hot water working condition, and if not, executing no action.
In the embodiment, the minimum operation period of the heating working condition is set firstly, and the minimum operation period of the heating working condition can be quitted only after the heating working condition is switched, so that the damage caused by overlarge pressure fluctuation due to frequent switching of the system can be avoided.
In this embodiment, before the step S34 is started, it is determined whether the second actual temperature T2 is less than or equal to the second set temperature T2, if yes, the process proceeds to the step S34, and if no, the process does not proceed to the step S34; before step S304 begins, it is determined whether the third actual temperature t3 is less than or equal to the first set temperature, if yes, step S304 is performed, otherwise, step S304 is not performed. Therefore, the temperature requirement of the air-conditioning heating module 600 can be preferentially ensured when the hot water refrigeration double working conditions are operated, so that the indoor temperature is rapidly reduced; can prior guarantee hot water module 500's temperature requirement when the hot water of operation heats dual operating mode, make hot water fast and satisfy user's demand.
Of course, in this embodiment, the on/off of the first switch component 201 and the second switch component 701 may be controlled as required to realize the independent or simultaneous operation of the air-conditioning heating module 600 or the hot water module 500, so as to realize the heating working condition, the cooling working condition, the hot water working condition or the hot water heating dual working condition, and the hot water cooling dual working condition, and the detailed description of the heating working condition, the cooling working condition, and the hot water working condition is omitted here.
Therefore, the hot water working condition and the refrigeration working condition can be operated independently, and in the operation process of the hot water refrigeration double working condition, if the hot water meets the user requirement and the refrigeration does not meet the requirement, the operation can be switched to the refrigeration working condition only; if the refrigeration meets the requirement and the hot water does not meet the requirement, the working condition of only operating the hot water can be switched to; if the refrigeration and the hot water meet the requirements, the system is in standby state to adapt to the requirements of the environment and users and reduce the energy consumption of the system.
In addition, in winter, the system can also run in a hot water mode independently to meet the domestic water requirements of users, so that the system is suitable for running all the year round, the vacancy of equipment is avoided, the utilization rate of the system is improved, and meanwhile, the space occupation and the use cost improvement caused by the installation of multiple sets of systems are avoided.
The system in the embodiment can also independently operate a heating working condition and a hot water heating working condition, and is more suitable for the use in winter scenes; like this air conditioner heating module 600, hot water module 500 can be in the operation under the whole scene of whole year, have reduced the vacancy rate of system, and one set of system can satisfy all user demands of user simultaneously, and its investment cost, use cost are lower.
Example 5:
the difference between this embodiment and embodiment 4 is only that this embodiment further includes a defrosting condition, and the defrosting condition specifically includes the following steps:
the control module presets a fourth set temperature T5;
the third temperature monitoring device 301 acquires the coil temperature t4 of the second heat exchanger 300, converts the coil temperature t4 into an electric signal and transmits the electric signal to the control module;
the control module judges whether the coil temperature T4 is less than or equal to a fourth set temperature T5, if yes, the following steps are sequentially executed: turning off the first switch assembly 201;
turning on the second switch assembly 701;
the four-way valve 700 is powered on;
opening the first throttle valve 3;
the second heat exchanger 300 is turned off, i.e. the fan of the finned heat exchanger is turned off;
opening the air-conditioning heating module 600;
the compressor module 100 is turned on.
The air-conditioning heating module 600 exchanges heat with the working medium in the third heat exchanger 400, the working medium is changed into a high-temperature high-pressure gaseous working medium, the high-temperature high-pressure gaseous working medium enters the second heat exchanger 300 through the four-way valve 700, at the moment, because the second heat exchanger 300 is in a closed state, the high-temperature high-pressure gaseous working medium exchanges heat with the coil pipe in the second heat exchanger 300, the high-temperature high-pressure gaseous working medium is changed into a medium-temperature high-pressure gaseous working medium, the temperature of the coil pipe is increased, and therefore the defrosting function is achieved. Of course, in the operation process of the defrosting mode, the third temperature monitoring device 301 continuously monitors the temperature of the coil and converts the temperature into an electric signal to be sent to the control module, a quitting temperature or a longest operation period is preset in the control module, and when the control module judges that the temperature of the coil reaches the quitting temperature or the defrosting mode reaches the longest operation period, the defrosting mode is stopped. Therefore, the system operation failure caused by the frosting of the coil pipe can be avoided.
The present invention has been described with reference to flowchart illustrations or block diagrams of methods, apparatus systems, and computer program products according to embodiments of the application, and it is understood that each flow or block of the flowchart illustrations or block diagrams, and combinations of flows or blocks in the flowchart illustrations or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (14)
1. A multi-mode heat pump system comprises a compressor module (100), a first heat exchanger (200), a second heat exchanger (300), a third heat exchanger (400) and a four-way valve (700), wherein the first heat exchanger (200) is communicated with a hot water module (500), the third heat exchanger (400) is communicated with an air-conditioning heating module (600), the compressor module (100) is circularly communicated with the first heat exchanger (200) and the second heat exchanger (300), the compressor module (100) is also circularly communicated with the third heat exchanger (400) and the second heat exchanger (300), and the multi-mode heat pump system is characterized by further comprising a reversing conduction module (1), a liquid storage tank (2) and a first throttle valve (3), the reversing conduction module (1) comprises an input module and an output module, the outlet end of the input module is connected with the inlet end of the liquid storage tank (2), the inlet end of the output module is connected with the outlet end of the liquid storage tank (2) through a first throttle valve (3), and the inlet end of the input module and the outlet end of the output module are respectively communicated with the outlet end (300) of the second heat exchanger and the outlet end of the third heat exchanger (400); the compressor module (100) is circularly communicated with the first heat exchanger (200), the liquid storage tank (2), the first throttle valve (3), the reversing conduction module (1), the second heat exchanger (300), and the port E and the port S of the four-way valve (700),
and a water supply loop is formed, and the compressor module (100) is circularly communicated with a port D and a port C of the four-way valve (700), the third heat exchanger (400), the reversing conduction module (1), the liquid storage tank (2), the first throttle valve (3), the reversing conduction module (1), the second heat exchanger (3), and a port E and a port S of the four-way valve (700) to form a heating loop.
2. A multimode heat pump system according to claim 1, characterized in that a first temperature monitoring device (501) is arranged in the hot water module (500), a second temperature monitoring device (6) is arranged in the air-conditioning heating module (600), and a third temperature monitoring device (301) is arranged on the second heat exchanger (300).
3. A multimode heat pump system according to claim 1 or 2, wherein the input module comprises two first check valves (11) and a first joint (12), the second heat exchanger (300) and the third heat exchanger (400) are respectively communicated with one ends of the two first check valves (11), the other ends of the two first check valves (11) are respectively communicated with the inlet end of the first joint (12), and the outlet end of the first joint (12) is communicated with the inlet end of the liquid storage tank (2); the output module comprises two second one-way valves (13) and a second joint (14), the second heat exchanger (300) and the third heat exchanger (400) are respectively communicated with one ends of the two second one-way valves (13), the other ends of the two second one-way valves (13) are communicated with the outlet end of the second joint (14), and the inlet end of the second joint (14) is communicated with the outlet end of the liquid storage tank (2).
4. A multi-mode heat pump system according to claim 3, wherein a first detecting means (4) for detecting flow is provided in communication between the input of the water supply module and the first heat exchanger (200); and a second detection device (5) for detecting flow is communicated between the input end of the air-conditioning heating module (600) and the third heat exchanger (400).
5. A multi-mode heat pump system according to claim 4, wherein a first switch assembly (201) is further provided in communication between the outlet end of the compressor module (100) and the first heat exchanger (200), and a second switch assembly (701) is further provided in communication between the outlet end of the compressor module (100) and the four-way valve (700).
6. A multi-mode heat pump system according to claim 5, further comprising an enthalpy increasing module (800) communicatively disposed between the output of the liquid storage tank (2) and the first throttle valve (3), the enthalpy increasing module (800) further being in communication with the compressor module (100).
7. A multi-mode heat pump system according to claim 6, wherein the enthalpy increasing module (800) comprises an intermediate heat exchanger (801), a second throttle valve (802) and a third junction (803), and the output end of the liquid storage tank (2) is communicated with the intermediate heat exchanger (801), the third junction (803) and the second throttle valve (802) to form a fourth loop; the third joint (803) is communicated with the second throttling valve (802) and the intermediate heat exchanger (801) to form a fifth loop; the output end of the intermediate heat exchanger (801) is also communicated with the compressor module (100).
8. A multi-mode heat pump system according to claim 7, wherein a first switch assembly (201) is further provided in communication between the output of the compressor module (100) and the first heat exchanger (200), and a second switch assembly (701) is further provided in communication between the output of the compressor module (100) and the port D of the four-way valve (700).
9. A control method applied to the multi-mode heat pump system of any one of claims 2 to 8, wherein the control method controls the multi-mode heat pump system to realize a hot water cooling dual working condition and a hot water heating dual working condition;
the hot water refrigeration double working condition specifically comprises the following steps:
s1: presetting a first set temperature T1 and a second set temperature T2;
s2: setting a first frequency and acquiring a first actual temperature t1 of the hot water module (500) and a second actual temperature t2 of the air-conditioning heating module (600) according to the first frequency;
s3: judging whether the first actual temperature T1 is less than a first set temperature T1 and whether the second actual temperature T2 is greater than a second set temperature T2, if so, executing a hot water refrigeration double working condition, and if not, stopping the hot water refrigeration double working condition;
the hot water heating dual working condition specifically comprises the following steps:
s10: presetting a third set temperature T3 and a fourth set temperature T4;
s20: setting a second frequency, and acquiring a third actual temperature t3 of the hot water module (500) and a fourth actual temperature t4 of the air-conditioning heating module (600) according to the second frequency;
s30: and judging whether the third actual temperature T3 is less than a third set temperature T3 or not and whether the fourth actual temperature T4 is less than a fourth actual temperature or not, if so, executing a hot water heating double working condition, and if not, stopping the hot water heating double working condition.
10. The control method according to claim 9, wherein the step S3 of executing the hot water cooling dual mode specifically further comprises the steps of:
s31: sequentially starting the air-conditioning heating module (600), the second detection device (5) and the second switch component (701);
s32: the four-way valve (700) is electrified, a port D of the four-way valve (700) is communicated with a port E, and a port S is communicated with a port C;
s33: the first throttle valve (3) and the second heat exchanger (300) are opened in sequence;
s34: sequentially starting the hot water module (500), the first switch component (201) and the first detection device (4);
s35: starting the compressor module (100);
the step S30 of executing the hot water heating dual condition specifically includes the following steps:
s301: sequentially starting the hot water module (500), the first switch component (201) and the first detection device (4);
s302: sequentially starting the air-conditioning heating module (600), the second detection device (5) and the second switch component (701);
s303: the four-way valve (700) is powered off, a port D of the four-way valve (700) is communicated with a port C, and a port E of the four-way valve (700) is communicated with a port S;
s304: the first throttle valve (3) and the second heat exchanger (300) are opened in sequence;
s305: the compressor module (100) is turned on.
11. The control method of claim 10, wherein the step S3 of executing the hot water cooling dual mode specifically further comprises the step S36 of: judging whether the first actual temperature T1 is greater than or equal to the first set temperature T1 again, if so, closing the hot water module (500) and the first switch assembly (201), otherwise, not executing the action; and judging whether the second actual temperature T2 is less than a second set temperature T2, if so, closing the air-conditioning heating module (600) and the second switch component (701), and if not, not executing corresponding actions.
12. The control method according to claim 11, wherein after the air-conditioning and heating module (600) and the second switching element (701) are turned off in step S36, the compressor module (100) is restarted after being suspended for the first period of time.
13. The control method according to claim 10, wherein step S30 further includes step S306: judging whether the third actual temperature T3 is greater than or equal to the first set temperature T1 again, if so, closing the hot water module (500) and the first switch assembly (201), otherwise, not executing the action; and judging whether the fourth actual temperature T4 is greater than the third set temperature T3, if so, turning off the air-conditioning heating module (600) and the second switch component (701), and if not, not executing the action.
14. The control method according to any one of claims 9 to 13, characterized in that before the step S34 is started, it is determined whether the second actual temperature T2 is less than or equal to the second set temperature T2, if yes, step S34 is performed, if no, step S34 is not performed; before step S304 starts, it is determined whether the third actual temperature t3 is less than or equal to the first set temperature, if yes, step S304 is performed, otherwise, step S304 is not performed.
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