CN113847754A - Multi-evaporator alternating defrosting air source heat pump unit and operation control method thereof - Google Patents
Multi-evaporator alternating defrosting air source heat pump unit and operation control method thereof Download PDFInfo
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- CN113847754A CN113847754A CN202111087608.9A CN202111087608A CN113847754A CN 113847754 A CN113847754 A CN 113847754A CN 202111087608 A CN202111087608 A CN 202111087608A CN 113847754 A CN113847754 A CN 113847754A
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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
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using 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
- F25B29/00—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously
- F25B29/003—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously of the compression type system
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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
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
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- General Engineering & Computer Science (AREA)
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention belongs to the technical field of heat pump units, and particularly relates to a multi-evaporator alternative defrosting air source heat pump unit and an operation control method thereof. The technical scheme is as follows: the utility model provides a frost air source heat pump set in turn of multiple evaporimeter, includes the cross valve, and the cross valve is connected with the compressor, and the third interface of cross valve has indoor heat exchanger subassembly through the pipe connection, has a plurality of outdoor heat exchanger subassemblies through the pipeline parallel connection between the other end of indoor heat exchanger subassembly and the fourth interface of cross valve, and the pipeline between indoor heat exchanger subassembly and the cross valve is connected with the three-way valve with one section pipeline that outdoor heat exchanger subassembly is close to the cross valve between. An operation control method of a multi-evaporator alternative defrosting air source heat pump unit comprises the steps that the defrosting condition of outdoor heat exchangers in winter is achieved, and one or more outdoor heat exchangers are defrosted in the heating state by switching a three-way valve. The invention provides a multi-evaporator alternative defrosting air source heat pump unit and an operation control method thereof.
Description
Technical Field
The invention belongs to the technical field of heat pump units, and particularly relates to a multi-evaporator alternative defrosting air source heat pump unit and an operation control method thereof.
Background
The policy of 'carbon peak reaching' and 'carbon neutralization' in China ensures that heat and cold for buildings can be electrified comprehensively in the future. Compared with a ground source heat pump, the air source heat pump has the advantages of flexible installation, low initial investment and the like, and is important equipment for clean heat supply in China. However, when the evaporator surface temperature of the air source heat pump is lower than the dew point temperature of air during operation in winter heating conditions, the fin surfaces gradually frost. The frost layer increases the heat exchange resistance between air and a refrigerant, and reduces the total heat transfer coefficient; meanwhile, the frost layer blocks the gaps of the fins, so that the flow resistance of air is increased, and the air quantity of the fan is reduced; when the frosting is serious, the unit may be shut down for protection. Experimental results of brayan et al show that frosting on the surface of the heat exchanger can result in a reduction of the heat exchange by about 40%. According to the research result of sanders, the unit performance of the air source heat pump is reduced by 35% under the frosting working condition. In the research of Beijing university of industry, the heat supply of the unit is reduced by 29 percent when the outdoor heat exchanger frosts. Therefore, how to defrost efficiently is a key problem to be solved urgently in the application of heat pump technology.
The conventional common defrosting modes of the air source heat pump mainly comprise electric heating defrosting, reverse defrosting, hot gas bypass defrosting and heat storage defrosting. Electrical heating defrosting: the heat exchanger is stable and effective, does not influence indoor heating, but has large power consumption and low conversion efficiency. ② reverse circulation defrosting: when defrosting, heat supply is stopped, heat is absorbed from indoor or heat supply heating media, indoor temperature is obviously reduced, heat supply quality is seriously affected (the indoor temperature is reduced by 2-7 ℃ during reverse defrosting), and cold and heat are offset. Hot gas bypass defrosting: the steam of the high-temperature refrigerator is sent into the outdoor heat exchanger for defrosting, the defrosting energy is from the work of the compressor, the defrosting can provide less heat, the defrosting time is long, and the energy consumption is high. Fourthly, heat storage defrosting: the independent energy accumulator is arranged, when the heat pump supplies heat normally, part of heat is stored in the heat accumulator, when defrosting is performed, the heat accumulator supplies heat to defrost, the indoor temperature can be prevented from dropping, but reverse circulation defrosting is essential, and cold and heat can still be offset. If water is used for heat storage, the unit has larger volume; if phase change heat storage is adopted, the phase change material has poor stability, short life span and high manufacturing cost. Through analysis and calculation, cold and heat offset exists during reverse defrosting or heat storage defrosting, namely, the heat of indoor air or hot water or phase change heat storage absorbed by defrosting is about 1/3-1/2, which is the power consumption of a former unit, so that the actual energy consumption of defrosting is improved by 40-50%, and the advantages of an air source heat pump are greatly weakened.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a multi-evaporator alternative defrosting air source heat pump unit and an operation control method thereof.
The technical scheme adopted by the invention is as follows:
the utility model provides a frost air source heat pump set in turn of multiple evaporator, includes the cross valve, there is the compressor through the pipe connection between two compressor interfaces of cross valve, the third interface of cross valve has indoor heat exchanger subassembly through the pipe connection, there are a plurality of outdoor heat exchanger subassemblies through the pipeline parallel connection between the other end of indoor heat exchanger subassembly and the fourth interface of cross valve, be connected with the three-way valve between pipeline between indoor heat exchanger subassembly and the cross valve and the outdoor heat exchanger subassembly is close to one section pipeline of cross valve.
The invention connects multiple groups of outdoor heat exchanger components in parallel, thereby defrosting one or more outdoor heat exchangers in a normal heat supply state. When defrosting is carried out on one outdoor heat exchanger, the three-way valve is switched, so that the outdoor heat exchanger and the indoor heat exchanger can be used as condensers, and the other outdoor heat exchangers can be used as evaporators. At the moment, when the outdoor heat exchanger is defrosted, normal indoor heat supply is not affected.
As a preferable scheme of the invention, the outdoor heat exchanger assembly comprises an outdoor heat exchanger, one end of the outdoor heat exchanger is connected with the three-way valve through a pipeline, and the other end of the outdoor heat exchanger is connected with an outdoor expansion valve and an outdoor one-way valve which are connected in parallel through pipelines. For the outdoor heat exchanger assembly under the non-defrosting working condition during heating in winter, after heat release and condensation of the refrigerant in the indoor heat exchanger, the refrigerant is blocked by the outdoor one-way valve and enters the outdoor expansion valve for throttling and pressure reduction, the refrigerant is in a low-temperature and low-pressure state after throttling and pressure reduction, and the low-temperature and low-pressure refrigerant enters the outdoor heat exchanger for absorbing heat. For the outdoor heat exchanger assembly for supplying heat in summer and the outdoor heat exchanger assembly under the defrosting condition during heating in winter, the temperature of the refrigerant is reduced after heat release and condensation are finished, and the refrigerant respectively flows through the outdoor one-way valve and then is absorbed in the indoor heat exchanger assembly.
As a preferable aspect of the present invention, the indoor heat exchanger is an air heat exchanger.
As a preferable aspect of the present invention, the number of the outdoor heat exchanger assemblies is four to eight groups.
As a preferred scheme of the invention, the indoor heat exchanger assembly comprises an indoor heat exchanger, one end of the indoor heat exchanger is connected with the four-way valve through a pipeline, and the other end of the indoor heat exchanger is connected with an indoor expansion valve and an indoor one-way valve which are connected in parallel through pipelines. In winter, after the heat of the refrigerant is released and condensed in the indoor heat exchanger, the refrigerant flows through the indoor check valve and enters the outdoor heat exchanger assembly to absorb heat. In summer, the temperature of the refrigerant is reduced after heat release and condensation are finished, the refrigerant is blocked by an indoor one-way valve, the refrigerant enters an indoor expansion valve for throttling and pressure reduction, the temperature is reduced while the pressure is reduced, a low-temperature low-pressure refrigerant is obtained, and the low-temperature low-pressure refrigerant enters an indoor heat exchanger for absorbing heat.
As a preferable scheme of the present invention, the indoor heat exchanger is a hot water heat exchanger or an air heat exchanger.
An operation control method of a multi-evaporator alternative defrosting air source heat pump unit comprises the following working conditions of defrosting of an outdoor heat exchanger in winter:
switching a three-way valve connected to an outdoor heat exchanger assembly needing defrosting to a pipeline between an indoor heat exchanger assembly and a four-way valve to be communicated with the outdoor heat exchanger assembly;
switching the rest three-way valves to the outdoor heat exchanger assembly to be communicated with a third interface of the four-way valve;
switching the four-way valve to flow in from the fourth interface and flow out from the third interface;
enabling the compressor to work, sucking low-pressure low-temperature refrigerant steam generated in the outdoor heat exchanger assembly except in a defrosting state by the compressor, and enabling high-temperature high-pressure gas to enter the indoor heat exchanger assembly and the outdoor heat exchanger assembly under the defrosting condition respectively to be cooled and release heat; and the low-temperature and low-pressure refrigerant enters the outdoor heat exchanger assembly except for the defrosting state to absorb heat, and the refrigerant enters the compressor again after absorbing heat, thus continuously circulating.
As a preferred scheme of the invention, after the refrigerant is cooled and released in the indoor heat exchanger assembly and the outdoor heat exchanger assembly under the defrosting condition, the refrigerant is in a low-temperature and low-pressure state by throttling and reducing pressure.
As the preferable scheme of the invention, the method also comprises the following normal heating working conditions in winter:
switching all three-way valves to an outdoor heat exchanger assembly to be communicated with a third interface of the four-way valve;
switching the four-way valve to flow in from the fourth interface and flow out from the third interface;
the compressor is enabled to work, the compressor sucks low-pressure low-temperature refrigerant steam generated in a plurality of outdoor heat exchanger assemblies, and high-temperature high-pressure gas enters the indoor heat exchanger assemblies to be cooled and release heat; after throttling and pressure reduction, the low-temperature and low-pressure refrigerant enters a plurality of outdoor heat exchanger components to absorb heat, and the refrigerant enters the compressor again after absorbing heat, thus the cycle is continued.
As the preferable scheme of the invention, the method also comprises the following refrigerating working conditions in summer:
switching all three-way valves to an outdoor heat exchanger assembly to be communicated with a third interface of the four-way valve;
switching the four-way valve to flow in from the third interface and flow out from the fourth interface;
the compressor is enabled to work, the compressor sucks low-pressure low-temperature refrigerant steam generated by the indoor heat exchanger assemblies, and high-temperature high-pressure refrigerant enters the outdoor heat exchanger assemblies to be cooled and release heat; after throttling and pressure reduction, the low-temperature and low-pressure refrigerant enters the indoor heat exchanger assembly to absorb heat, and the refrigerant enters the compressor again, so that the circulation is continued.
The invention has the beneficial effects that:
the invention connects multiple groups of outdoor heat exchanger components in parallel, thereby defrosting one or more outdoor heat exchangers in a normal heat supply state. When defrosting is carried out on one outdoor heat exchanger, the three-way valve is switched, so that the outdoor heat exchanger and the indoor heat exchanger can be used as condensers, and the other outdoor heat exchangers can be used as evaporators. At the moment, when the outdoor heat exchanger is defrosted, normal indoor heat supply is not affected.
Drawings
FIG. 1 is a schematic diagram of the present invention in a normal heating operation in winter;
FIG. 2 is a schematic diagram of the present invention in a winter defrost mode;
fig. 3 is a schematic structural diagram of the present invention in a cooling condition in summer.
In the figure, 1-four-way valve; 2-a compressor; 3-an indoor heat exchanger assembly; 4-an outdoor heat exchanger assembly; 5-three-way valve; 11-compressor interface; 12-a third interface; 13-a fourth interface; 31-indoor heat exchanger; 32-indoor expansion valve; 33-an indoor one-way valve; 41-outdoor heat exchanger; 42-outdoor expansion valve; 43-outdoor check valve; 51-a first three-way valve; 52-a second three-way valve; 53-a third three-way valve; 54-a fourth three-way valve; 411 — a first outdoor heat exchanger; 412-a second outdoor heat exchanger; 413-a third outdoor heat exchanger; 414 — a fourth outdoor heat exchanger; 421-first outdoor expansion valve; 422-a second outdoor expansion valve; 423-third outdoor expansion valve; 424-fourth outdoor expansion valve; 431-a first outdoor check valve; 432-a second outdoor check valve; 433-a third extra-corporeal check valve; 434-fourth outdoor check valve.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
As shown in fig. 1 to 3, the multiple-evaporator alternative defrosting air source heat pump unit of the embodiment includes a four-way valve 1, a compressor 2 is connected between two interfaces of the compressor 2 of the four-way valve 1 through a pipeline, an indoor heat exchanger assembly 3 is connected to a third interface 12 of the four-way valve 1 through a pipeline, a plurality of outdoor heat exchanger assemblies 4 are connected in parallel between the other end of the indoor heat exchanger assembly 3 and a fourth interface 13 of the four-way valve 1 through pipelines, and a three-way valve 5 is connected between a pipeline between the indoor heat exchanger assembly 3 and the four-way valve 1 and a section of pipeline of the outdoor heat exchanger assembly 4 close to the four-way valve 1.
The indoor heat exchanger 31 is an air heat exchanger. The number of the outdoor heat exchanger assemblies 4 may be four to eight groups. The indoor heat exchanger 31 is a hot water heat exchanger or an air heat exchanger.
The present invention connects multiple sets of outdoor heat exchanger assemblies 4 in parallel so that one or more outdoor heat exchangers 41 can be defrosted in a normal heat supply state. When defrosting a certain outdoor heat exchanger 41, the three-way valve 5 is switched so that the outdoor heat exchanger 41 and the indoor heat exchanger 31 function as condensers and the remaining outdoor heat exchangers 41 function as evaporators. In this case, the normal indoor heating is not affected when defrosting the outdoor heat exchanger 41.
Specifically, the outdoor heat exchanger assembly 4 includes an outdoor heat exchanger 41, one end of the outdoor heat exchanger 41 is connected to the three-way valve 5 through a pipeline, and the other end of the outdoor heat exchanger 41 is connected to an outdoor expansion valve 42 and an outdoor check valve 43, which are connected in parallel, through pipelines. For the outdoor heat exchanger assembly 4 under the non-defrosting condition during heating in winter, after heat release and condensation of the refrigerant in the indoor heat exchanger 31, the refrigerant is blocked by the outdoor one-way valve 43 and enters the outdoor expansion valve 42 for throttling and pressure reduction, the refrigerant is in a low-temperature and low-pressure state after throttling and pressure reduction, and the low-temperature and low-pressure refrigerant enters the outdoor heat exchanger 41 for absorbing heat. For the outdoor heat exchanger assembly 4 for supplying heat in summer and the outdoor heat exchanger assembly 4 under the defrosting condition during heating in winter, the temperature of the refrigerant is reduced after heat release and condensation are finished, and the refrigerant respectively flows through the outdoor one-way valve 43 and then flows into the indoor heat exchanger assembly 3 to absorb heat.
Specifically, the indoor heat exchanger assembly 3 includes an indoor heat exchanger 31, one end of the indoor heat exchanger 31 is connected to the four-way valve 1 through a pipeline, and the other end of the indoor heat exchanger 31 is connected to an indoor expansion valve 32 and an indoor check valve 33 which are connected in parallel through a pipeline. In winter, after heat is released and condensed in the indoor heat exchanger 31, the refrigerant flows through the indoor check valve 33 and enters the outdoor heat exchanger assembly 4 to absorb heat. In summer, the temperature of the refrigerant is reduced after heat release and condensation are finished, the refrigerant is blocked by the indoor check valve 33, enters the indoor expansion valve 32 for throttling and pressure reduction, the temperature is reduced while the pressure is reduced, a low-temperature low-pressure refrigerant is obtained, and the low-temperature low-pressure refrigerant enters the indoor heat exchanger 31 for absorbing heat.
An operation control method of a multi-evaporator alternative defrosting air source heat pump unit comprises the following working conditions:
defrosting condition of the outdoor heat exchanger 41 in winter:
switching a three-way valve 5 connected to the outdoor heat exchanger assembly 4 to be defrosted to a pipeline between the indoor heat exchanger assembly 3 and the four-way valve 1 to be communicated with the outdoor heat exchanger assembly 4;
switching the rest three-way valves 5 to the outdoor heat exchanger assembly 4 to be communicated with a third interface 12 of the four-way valve 1;
the four-way valve 1 is switched to flow in from the fourth interface 13 and flow out from the third interface 12;
the compressor 2 is enabled to work, the compressor 2 sucks low-pressure low-temperature refrigerant steam generated in the outdoor heat exchanger assembly 4 except the defrosting state, and high-temperature high-pressure gas respectively enters the indoor heat exchanger assembly 3 and the outdoor heat exchanger assembly 4 under the defrosting condition to be cooled and released; the low-temperature and low-pressure refrigerant after throttling and pressure reduction enters the outdoor heat exchanger assembly 4 except for the defrosting state to absorb heat, and the refrigerant enters the compressor 2 again after absorbing heat, thus the cycle is continuous.
Normal heat supply working condition in winter:
all the three-way valves 5 are switched to the outdoor heat exchanger assembly 4 to be communicated with a third interface 12 of the four-way valve 1;
the four-way valve 1 is switched to flow in from the fourth interface 13 and flow out from the third interface 12;
the compressor 2 is enabled to work, the compressor 2 sucks low-pressure low-temperature refrigerant steam generated in the outdoor heat exchanger assemblies 4, and high-temperature high-pressure gas enters the indoor heat exchanger assemblies 3 to be cooled and release heat; after throttling and pressure reduction, the low-temperature and low-pressure refrigerant enters a plurality of outdoor heat exchanger components 4 to absorb heat, and the refrigerant enters the compressor 2 again after absorbing heat, and the process is circulated continuously.
Refrigerating working condition in summer:
all the three-way valves 5 are switched to the outdoor heat exchanger assembly 4 to be communicated with a third interface 12 of the four-way valve 1;
the four-way valve 1 is switched to flow in from the third interface 12 and flow out from the fourth interface 13;
the compressor 2 is enabled to work, the compressor 2 sucks low-pressure low-temperature refrigerant steam generated by the indoor heat exchanger assemblies 3, and high-temperature high-pressure refrigerant enters the outdoor heat exchanger assemblies 4 to be cooled and release heat; after throttling and pressure reduction, the low-temperature and low-pressure refrigerant enters the indoor heat exchanger assembly 3 to absorb heat, and the refrigerant enters the compressor 2 again, so that the circulation is continued.
Example 1:
as shown in figure 1, the multi-evaporator alternating defrosting air source heat pump unit controls a four-way valve 1 and controls the switching of a first three-way valve 51, a second three-way valve 52, a third three-way valve 53 and a fourth three-way valve 54 at the same time when the heat pump unit is in a normal heating working condition in winter. The compressor 2 sucks in the low-pressure and low-temperature refrigerant vapor generated in the first, second, third, and fourth outdoor heat exchangers 411, 412, 413, and 414; after adiabatic compression, the refrigerant becomes a high-temperature and high-pressure gas, and enters the indoor heat exchanger 31. The refrigerant is cooled and releases heat in the indoor heat exchanger 31, and at this time, the indoor heat exchanger 31 is a condenser and releases heat indoors. After heat is released and condensed in the indoor heat exchanger 31, the refrigerant flows through the indoor check valve 33, is blocked by the first outdoor check valve 431, the second outdoor check valve 432, the third outdoor check valve 433, and the fourth outdoor check valve 434, and enters the first outdoor expansion valve 421, the second outdoor expansion valve 422, the third outdoor expansion valve 423, and the fourth outdoor expansion valve 424 for throttling and pressure reduction, respectively. The refrigerant after throttling and pressure reduction is in a low-temperature and low-pressure state, and the low-temperature and low-pressure refrigerant enters the first outdoor heat exchanger 411, the second outdoor heat exchanger 412, the third outdoor heat exchanger 413 and the fourth outdoor heat exchanger 414 to absorb heat. At this time, the outdoor heat exchanger 41 is an evaporator, and the refrigerant absorbs heat and then enters the compressor 2 again, and thus the cycle is continued. When the heat exchange modules are added for increasing the heat exchange quantity, the working principle is similar.
Example 2:
as shown in fig. 2, taking the defrosting condition of one of the outdoor heat exchangers 41 as an example, the multi-evaporator alternative defrosting air source heat pump unit controls the four-way valve 1 to change the channel of the first three-way valve 51 when the heat supply condition is normal in winter. The compressor 2 sucks in the low-pressure and low-temperature refrigerant vapor generated in the second, third, and fourth outdoor heat exchangers 412, 413, 414. After adiabatic compression, the refrigerant is changed into high-temperature and high-pressure gas, and the high-temperature and high-pressure gas enters the indoor heat exchanger 31 and the first outdoor heat exchanger 411, respectively. The refrigerant cools and releases heat in the indoor heat exchanger 31 and the first outdoor heat exchanger 411, and at this time, the indoor heat exchanger 31 and the first outdoor heat exchanger 411 are condensers and release heat indoors. The refrigerant radiates heat and condenses in the indoor heat exchanger 31 and the first outdoor heat exchanger 411, and then flows through the indoor check valve 33 and the first outdoor check valve 431, respectively. Blocked by the second outdoor check valve 432, the third outdoor check valve 433, and the fourth outdoor check valve 434, respectively enter the second outdoor expansion valve 422, the third outdoor expansion valve 423, and the fourth outdoor expansion valve 424 for throttling and pressure reduction. The refrigerant after throttling and pressure reduction is in a low-temperature and low-pressure state, and the low-temperature and low-pressure refrigerant enters the second outdoor heat exchanger 412, the third outdoor heat exchanger 413 and the fourth outdoor heat exchanger 414 to absorb heat. In this case, the second outdoor heat exchanger 412, the third outdoor heat exchanger 413, and the fourth outdoor heat exchanger 414 are evaporators. The refrigerant absorbs heat and then enters the compressor 2 again, and the circulation is continued. The working principle is similar when heat exchange modules are added in order to increase the amount of heat exchange.
Example 3:
as shown in FIG. 3, when a multi-evaporator alternating defrosting air source heat pump unit is in a cooling condition in summer, the four-way valve 1 is controlled to switch, and the first three-way valve 51, the second three-way valve 52, the third three-way valve 53 and the fourth three-way valve 54 are controlled to switch at the same time. The compressor 2 sucks the low-pressure and low-temperature refrigerant vapor generated by the indoor heat exchanger 31, the refrigerant temperature and pressure are increased after adiabatic compression, and the high-temperature and high-pressure refrigerant enters the first outdoor heat exchanger 411, the second outdoor heat exchanger 412, the third outdoor heat exchanger 413 and the fourth outdoor heat exchanger 414 to release heat to the outdoor. At this time, the first outdoor heat exchanger 411, the second outdoor heat exchanger 412, the third outdoor heat exchanger 413, and the fourth outdoor heat exchanger exchange heat to form a condenser. After the heat release and condensation of the refrigerant are completed, the refrigerant is lowered in temperature and flows through the first outdoor check valve 431, the second outdoor check valve 432, the third outdoor check valve 433, and the fourth outdoor check valve 434, respectively. After being converged, the refrigerant is blocked by an indoor check valve 33, enters an indoor expansion valve 32, is throttled and depressurized, and the temperature is reduced while the pressure is reduced, so that a low-temperature and low-pressure refrigerant is obtained. The low-temperature and low-pressure refrigerant enters the indoor heat exchanger 31 to absorb heat and then enters the compressor 2 again, and the process is circulated continuously. The working principle is similar when heat exchange modules are added in order to increase the amount of heat exchange.
The invention is not limited to the above alternative embodiments, and any other various forms of products can be obtained by anyone in the light of the present invention, but any changes in shape or structure thereof, which fall within the scope of the present invention as defined in the claims, fall within the scope of the present invention.
Claims (10)
1. The utility model provides a frost air source heat pump set in turn of multiple evaporator, a serial communication port, including cross valve (1), there are compressor (2) through the pipe connection between two compressor (2) interfaces of cross valve (1), third interface (12) of cross valve (1) have indoor heat exchanger subassembly (3) through the pipe connection, there are a plurality of outdoor heat exchanger subassemblies (4) through the pipeline parallel connection between the other end of indoor heat exchanger subassembly (3) and fourth interface (13) of cross valve (1), be connected with three-way valve (5) between pipeline between indoor heat exchanger subassembly (3) and cross valve (1) and outdoor heat exchanger subassembly (4) are close to one section pipeline of cross valve (1).
2. The multiple-evaporator alternating defrosting air source heat pump unit according to claim 1, characterized in that the outdoor heat exchanger assembly (4) comprises an outdoor heat exchanger (41), one end of the outdoor heat exchanger (41) is connected with the three-way valve (5) through a pipeline, and the other end of the outdoor heat exchanger (41) is connected with an outdoor expansion valve (42) and an outdoor one-way valve (43) which are connected in parallel through pipelines.
3. The multiple-evaporator alternating defrosting air source heat pump unit according to claim 2, characterized in that the indoor heat exchanger (31) is an air heat exchanger.
4. The multiple-evaporator alternating defrosting air source heat pump unit according to claim 1, characterized in that the number of the outdoor heat exchanger assemblies (4) is four to eight.
5. The multiple-evaporator alternating defrosting air source heat pump unit according to claim 1, characterized in that the indoor heat exchanger assembly (3) comprises an indoor heat exchanger (31), one end of the indoor heat exchanger (31) is connected with the four-way valve (1) through a pipeline, and the other end of the indoor heat exchanger (31) is connected with an indoor expansion valve (32) and an indoor one-way valve (33) which are connected in parallel through pipelines.
6. The multiple-evaporator alternating defrosting air source heat pump unit according to claim 5, characterized in that the indoor heat exchanger (31) is a hot water heat exchanger or an air heat exchanger.
7. The operation control method of the multiple-evaporator alternating defrosting air source heat pump unit according to claim 1, characterized by comprising the defrosting conditions of the outdoor heat exchanger (41) in winter:
a three-way valve (5) connected to the outdoor heat exchanger assembly (4) to be defrosted is switched to a pipeline between the indoor heat exchanger assembly (3) and the four-way valve (1) to be communicated with the outdoor heat exchanger assembly (4);
switching the rest three-way valves (5) to the outdoor heat exchanger assembly (4) to be communicated with a third interface (12) of the four-way valve (1);
the four-way valve (1) is switched to flow in from the fourth interface (13) and flow out from the third interface (12);
enabling the compressor (2) to work, sucking low-pressure low-temperature refrigerant steam generated in the outdoor heat exchanger assembly (4) except in a defrosting state by the compressor (2), and enabling high-temperature high-pressure gas to enter the indoor heat exchanger assembly (3) and the outdoor heat exchanger assembly (4) under a defrosting condition respectively to be cooled and release heat; and the low-temperature and low-pressure refrigerant enters the outdoor heat exchanger assembly (4) except for the defrosting state to absorb heat, and the refrigerant enters the compressor (2) again after absorbing heat, thus the cycle is continued.
8. The operation control method of the multiple-evaporator alternating defrosting air source heat pump unit according to claim 7, characterized in that after the refrigerant is cooled and released in the indoor heat exchanger assembly (3) and the outdoor heat exchanger assembly (4) under defrosting condition, the refrigerant is in low temperature and low pressure state by throttling and reducing pressure.
9. The operation control method of the multiple-evaporator alternating defrosting air source heat pump unit according to claim 7, characterized by further comprising the normal heating working condition in winter:
all the three-way valves (5) are switched to the outdoor heat exchanger assembly (4) to be communicated with a third interface (12) of the four-way valve (1);
the four-way valve (1) is switched to flow in from the fourth interface (13) and flow out from the third interface (12);
the compressor (2) is enabled to work, the compressor (2) sucks low-pressure low-temperature refrigerant steam generated in a plurality of outdoor heat exchanger assemblies (4), and high-temperature high-pressure gas enters the indoor heat exchanger assembly (3) to be cooled and release heat; after throttling and pressure reduction, the low-temperature and low-pressure refrigerant enters a plurality of outdoor heat exchanger components (4) to absorb heat, and then enters the compressor (2) again after absorbing heat, and the process is circulated continuously.
10. The operation control method of the multiple-evaporator alternating defrosting air source heat pump unit according to claim 7, characterized by further comprising a summer refrigeration condition:
all the three-way valves (5) are switched to the outdoor heat exchanger assembly (4) to be communicated with a third interface (12) of the four-way valve (1);
the four-way valve (1) is switched to flow in from the third interface (12) and flow out from the fourth interface (13);
the compressor (2) is enabled to work, the compressor (2) sucks low-pressure low-temperature refrigerant steam generated by the indoor heat exchanger assembly (3), and high-temperature high-pressure refrigerant enters the outdoor heat exchanger assemblies (4) to be cooled and release heat; after throttling and pressure reduction, the low-temperature and low-pressure refrigerant enters the indoor heat exchanger assembly (3) to absorb heat, and the refrigerant enters the compressor (2) again, so that the circulation is continued.
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| CN202111087608.9A CN113847754A (en) | 2021-09-16 | 2021-09-16 | Multi-evaporator alternating defrosting air source heat pump unit and operation control method thereof |
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| CN202111087608.9A CN113847754A (en) | 2021-09-16 | 2021-09-16 | Multi-evaporator alternating defrosting air source heat pump unit and operation control method thereof |
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| CN114370692A (en) * | 2022-02-28 | 2022-04-19 | 海信（广东）空调有限公司 | Air conditioner and control method thereof |
| CN115031438A (en) * | 2022-06-16 | 2022-09-09 | 江苏省华扬太阳能有限公司 | Efficient defrosting heat pump type small air conditioner |
| CN115235141A (en) * | 2022-07-14 | 2022-10-25 | 黄永年 | Efficient defrosting heat pump type small air conditioner |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114370692A (en) * | 2022-02-28 | 2022-04-19 | 海信（广东）空调有限公司 | Air conditioner and control method thereof |
| CN115031438A (en) * | 2022-06-16 | 2022-09-09 | 江苏省华扬太阳能有限公司 | Efficient defrosting heat pump type small air conditioner |
| CN115031438B (en) * | 2022-06-16 | 2023-12-26 | 江苏省华扬太阳能有限公司 | Efficient defrosting heat pump type small air conditioner |
| CN115235141A (en) * | 2022-07-14 | 2022-10-25 | 黄永年 | Efficient defrosting heat pump type small air conditioner |
| CN115235141B (en) * | 2022-07-14 | 2023-10-31 | 黄永年 | Efficient defrosting heat pump type small air conditioner |
| CN115270521A (en) * | 2022-09-26 | 2022-11-01 | 中国建筑西南设计研究院有限公司 | Simulation method for influence of air density on performance of air source heat pump heating system |
| CN115270521B (en) * | 2022-09-26 | 2022-12-13 | 中国建筑西南设计研究院有限公司 | Simulation method for influence of air density on performance of air source heat pump heating system |
| CN116045404A (en) * | 2023-02-22 | 2023-05-02 | 大连理工大学 | Single-stage parallel PVT-air source multi-split heat pump air conditioning system with alternate defrosting and uninterrupted heat supply |
| CN116182432A (en) * | 2023-02-22 | 2023-05-30 | 大连理工大学 | Overlapping type compressed PVT-air source heat pump system for supplying heat without intermittent defrosting alternately |
| CN116182432B (en) * | 2023-02-22 | 2024-04-19 | 大连理工大学 | Overlapping type compressed PVT-air source heat pump system for supplying heat without intermittent defrosting alternately |
| CN116045404B (en) * | 2023-02-22 | 2024-04-19 | 大连理工大学 | Single-stage parallel PVT-air source multi-split heat pump air conditioning system with alternate defrosting and uninterrupted heat supply |
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