CN109579387B - Defrosting method of air source heat pump system based on single-outside heat exchanger multi-branch alternate defrosting - Google Patents

Defrosting method of air source heat pump system based on single-outside heat exchanger multi-branch alternate defrosting Download PDF

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Publication number
CN109579387B
CN109579387B CN201910028130.9A CN201910028130A CN109579387B CN 109579387 B CN109579387 B CN 109579387B CN 201910028130 A CN201910028130 A CN 201910028130A CN 109579387 B CN109579387 B CN 109579387B
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branch
defrosting
electronic expansion
heat exchanger
expansion valve
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CN109579387A (en
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段彦军
王江
任楠
徐捷
王凯
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Beijing Machinery Equipment Research Institute
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Beijing Machinery Equipment Research Institute
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B47/00Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02Defrosting cycles
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B13/00Compression machines, plant or systems with reversible cycle
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B30/00Heat pumps
    • F25B30/02Heat pumps of the compression type
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B30/00Heat pumps
    • F25B30/06Heat pumps characterised by the source of low potential heat
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B41/00Fluid-circulation arrangements
    • F25B41/30Expansion means; Dispositions thereof
    • F25B41/31Expansion valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B43/00Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • F25B43/006Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat accumulators
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The invention relates to a defrosting method of an air source heat pump system based on single-outer-side heat exchanger multi-branch alternate defrosting, and belongs to the technical field of refrigeration, air conditioning and heat pumps. The problem of prior art air supply heat pump defrosting technique or obviously influence the effect of heating, or the energy consumption is great, or system architecture complicacy influences system compactness is solved. The defrosting method of the invention is to adjust the first branch electronic expansion valve to a defrosting mode, and the second branch electronic expansion valve maintains a heating mode to defrost the first branch. And after the first branch defrosting is finished, adjusting the opening degrees of the electronic expansion valves of the two branches, and defrosting the second branch. The switching of branch heating and defrosting functions is realized by controlling the opening degree of each branch electronic expansion valve. During defrosting, the single branch road defrosting, another branch road heats, heats the waste heat that the branch road can absorb the defrosting, has realized defrosting under the prerequisite that does not increase system's volume and weight, not additionally consume the electric energy, weakens the influence of defrosting process to heating the effect simultaneously.

Description

Defrosting method of air source heat pump system based on single-outside heat exchanger multi-branch alternate defrosting
Technical Field
The invention relates to the technical field of refrigeration, air conditioning and heat pumps, in particular to an air source heat pump system based on single-outer-side heat exchanger multi-branch alternate defrosting.
Background
Along with the popularization of energy crisis furniture and countries to clean energy and the development of low temperature heat pump technology, the application of air source heat pump in the aspect of winter heating and domestic hot water supply is more and more extensive, but when external environment temperature is lower, in order to absorb heat from the outside air, heat pump system's outside heat exchanger surface temperature can be less than 0 ℃, the vapor in the outside air can condense into frost and cover outside heat exchanger surface this moment, if the frost layer is not eliminated in time, can be amasss more thick more, reduce outside heat exchanger heat transfer effect, thereby reduce heat pump system heating capacity, can lead to system low pressure protection or exhaust temperature to be too high when serious, cause system's part to damage even.
The prior mature heat pump defrosting technologies comprise refrigerant reverse defrosting, hot gas bypass defrosting and electric heating defrosting, and a double-evaporator alternative defrosting mode is also provided.
The refrigerant reverse defrosting needs to discharge high-temperature refrigerant to the outer heat exchanger, discharge low-temperature refrigerant to the inner heat exchanger, can lead to the drastic decline of inboard temperature, influences inboard travelling comfort, and the refrigerant switching-over involves opening and shutting down of a plurality of parts in addition, and not only consuming time is more, and the refrigerant switching-over leads to high-low pressure to change violently, causes very big impact to system's component, also is the defrosting mode that the energy consumption is the biggest simultaneously.
When the hot gas is in bypass defrosting, the flow direction of a refrigerant is not required to be changed, a bypass is led to the outer side heat exchanger from the exhaust port of the compressor, a bypass switch control valve is opened when defrosting is required, a part of high-temperature gas discharged by the compressor enters the outer side heat exchanger for defrosting, and a part of high-temperature gas still enters the inner side heat exchanger for continuous heating. Although the heating function is not stopped during defrosting, because a part of high-temperature gas enters the outer heat exchanger, the high-temperature gas entering the inner heat exchanger is obviously reduced, and the heating effect is also greatly influenced.
The electric heating defrosting needs to be realized by adding an electric heating device on the outer side heat exchanger, and the electric heating defrosting is realized by directly consuming electric energy during defrosting, so that the control is simple, but the energy consumption is higher, and the volume of the outer side heat exchanger can be obviously increased by the electric heating device.
The defrosting technology of the outer heat exchangers for alternately defrosting switches one group of outer heat exchangers into a subcooler of an inner heat exchanger through a valve element in a control system during defrosting, defrosting is carried out by utilizing high-temperature waste heat of a refrigerant, and one group of outer heat exchangers are switched to defrost in the same mode after defrosting is finished.
In summary, the existing air source heat pump defrosting technology obviously affects the heating effect, or has large energy consumption, or affects the compactness of the system, and is difficult to meet the future development requirement of the air source heat pump system.
Disclosure of Invention
In view of the foregoing analysis, an embodiment of the present invention aims to provide a defrosting method for an air source heat pump system based on single-outside heat exchanger multi-branch alternative defrosting, so as to solve the problem that the existing defrosting technology for an air source heat pump obviously affects the heating effect, or has large energy consumption, or affects the compactness of the system, and is difficult to meet the future development requirement of the air source heat pump system.
The invention aims to provide a defrosting method of an air source heat pump system based on single-outside heat exchanger multi-branch alternative defrosting, which enables the defrosting process to be more efficient and more comfortable by using a simpler system composition and a more convenient control mode, and does not increase the volume weight of the system.
The defrosting method comprises the following steps:
s1, adjusting the first branch electronic expansion valve to be in a defrosting mode, maintaining the second branch electronic expansion valve in a heating mode, and defrosting the first branch;
and S2, after the first branch defrosting is finished, adjusting the opening degree of the electronic expansion valves of the two branches, and defrosting the second branch.
Preferably, at least three electronic expansion valves are included, and defrosting is carried out by at least three branches; by controlling the opening of the electronic expansion valve, the single branch is defrosted, and other branches are heated; and defrosting other branches in sequence.
In step S1, when defrosting the first branch, the first branch electronic expansion valve is fully opened, and the second branch electronic expansion valve is throttled; high-temperature liquid discharged by the inner side heat exchanger directly enters the first branch for defrosting, and meanwhile, the second branch continues to complete the heating function.
In step S2, when defrosting the second branch, the electronic expansion valve of the second branch is fully opened, and the electronic expansion valve of the first branch throttles; high-temperature liquid discharged by the inner side heat exchanger directly enters the second branch circuit to defrost, and meanwhile, the first branch circuit continues to complete the heating function.
The pipelines of the first branch and the second branch are mutually staggered and evenly distributed, and any two adjacent pipelines are two first branches and the other two second branches.
Specifically, the air heat source pump system includes: an outside heat exchanger and an inside heat exchanger; one end of the outer side heat exchanger is connected with a first branch electronic expansion valve and a second branch electronic expansion valve; the switching of the heating and defrosting functions of the first branch and the second branch is realized by controlling the opening degrees of the electronic expansion valve of the first branch and the electronic expansion valve of the second branch.
Specifically, the other end of the outer heat exchanger is connected with a four-way valve; the four-way valve is connected with the gas-liquid separator; the gas-liquid separator is connected with the compressor, and the gas-liquid separator separates gas and leads the gas to the compressor.
Specifically, the compressor is connected with one end of the inner side heat exchanger through a four-way valve; the compressor compresses the low-temperature refrigerant gas to raise the temperature.
Specifically, the other end of the inner side heat exchanger is connected with a refrigeration electronic expansion valve; the refrigeration electronic expansion valve is connected with one end of a liquid storage tank for storing redundant refrigerant.
Specifically, the other end of the liquid storage tank is connected with a drying filter.
Specifically, the dry filter is connected with a first branch electronic expansion valve and a second branch electronic expansion valve; the dry filter is used to filter impurities generated during the circulation process.
The beneficial effects of adopting the above embodiment are:
1. according to the invention, by adopting the plurality of branches of single outer side heat exchangers, the alternately defrosting part is limited in the single outer side heat exchanger, so that defrosting can be realized without more than two groups of outer side heat exchangers and fans, and the volume and the weight of the system can not be increased.
2. The invention adopts the mode that the high-temperature liquid discharged by the inner heat exchanger directly enters the outer heat exchanger for defrosting, and the defrosting is carried out by utilizing the high-temperature waste heat of the refrigerant completing the heating cycle, so that the electric energy is not additionally consumed, and the energy is more saved.
3. According to the invention, the branch of the outer side heat exchanger is reasonably designed, the heating branch reasonably recovers the waste heat of the high-temperature refrigerant utilized by the defrosting branch, and the heat exchange effect of the heating branch is enhanced.
In the invention, the technical schemes can be combined with each other to realize more preferable combination schemes. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout.
FIG. 1 is a schematic diagram of the heating function of the system (arrows indicate refrigerant flow);
FIG. 2 is a schematic diagram of the system refrigeration function (arrows indicate refrigerant flow);
fig. 3 shows two arrangements of the outer heat exchanger tubes.
Reference numerals:
1-an outside heat exchanger; 2-a first branch electronic expansion valve; 3-a second branch electronic expansion valve; 4-refrigeration electronic expansion valve; 5-inside heat exchanger; 6-a compressor; 7-a four-way valve; 8-a gas-liquid separator; 9-drying the filter; 10-a liquid storage tank; 11-a first branch conduit; 12-second branch conduit.
Detailed Description
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate preferred embodiments of the invention and together with the description, serve to explain the principles of the invention and not to limit the scope of the invention.
The specific embodiment of the invention provides a defrosting method of an air heat source pump system based on single-outside heat exchanger multi-branch alternate defrosting, which comprises the following steps:
s1, first, the first branch electronic expansion valve 2 is adjusted to the defrosting mode, and the second branch electronic expansion valve 3 maintains the heating mode to defrost the first branch;
and S2, after the first branch defrosting is finished, adjusting the opening degree of the electronic expansion valves of the two branches, and defrosting the second branch.
In step S1, when the first branch is defrosted, the first branch electronic expansion valve 2 is fully opened, and the second branch electronic expansion valve 3 throttles; high-temperature liquid discharged by the inner side heat exchanger 5 directly enters the first branch for defrosting; meanwhile, the second branch continues to complete the heating function.
In step S2, when defrosting the second branch, the second branch electronic expansion valve 3 is fully opened, and the first branch electronic expansion valve throttles; the high-temperature liquid discharged by the inner side heat exchanger 5 directly enters the second branch circuit for defrosting, and meanwhile, the first branch circuit continues to complete the heating function.
It is to be noted that when the first branch is defrosted by using high-temperature residual heat carried by the high-temperature refrigerant liquid discharged from the inside heat exchanger 5. The temperature of the first branch is obviously higher than that of the second branch, and a part of heat is transferred to the second branch through the fins of the outer heat exchanger 1 and the air heated by the first branch, so that the heat absorption capacity of the low-temperature refrigerant of the second branch is increased. Thus, by recovering a part of the waste heat of the high-temperature refrigerant liquid, the heating effect can not be obviously reduced during defrosting.
In order to ensure that the heating branch can better absorb the residual heat of the high-temperature liquid in the defrosting branch, the heating branch pipeline must have the defrosting branch pipeline adjacent to the heating branch pipeline. That is, any four adjacent pipelines, two of which are the first branch and two of which are the second branch, are arranged in pairs. The pipelines of the first branch and the second branch are mutually staggered and uniformly distributed. When the system is defrosted, a single branch is defrosted, the other branch is heated, and the heating branch absorbs waste heat of the defrosting branch.
It should be noted that the air source heat pump system based on single-outside heat exchanger multi-branch alternate defrosting can defrost by multiple branches, the more branches, the smaller the influence of the defrosting process on the heating effect, only the branch electronic expansion valves with the same number need to be equipped according to the number of branches, during defrosting, the single branch electronic expansion valve is fully opened to defrost, and the other branch electronic expansion valves keep the throttling state to continue to complete the heating function. And switching different branches to defrost in sequence by controlling the opening degree of the electronic expansion valve of each branch until all the branches of the outer heat exchanger defrost.
The invention discloses an air source heat pump system based on single-outside heat exchanger multi-branch alternate defrosting. The method comprises the following steps: the system comprises an outer heat exchanger 1, a first branch electronic expansion valve 2, a second branch electronic expansion valve 3, a refrigeration electronic expansion valve 4, an inner heat exchanger 5, a compressor 6, a four-way valve 7, a gas-liquid separator 8, a drying filter 9 and a liquid storage tank 10;
the front end of the outer side heat exchanger 1 is connected with a first branch electronic expansion valve 2 and a second branch electronic expansion valve 3, and the two electronic expansion valves divide the outer side heat exchanger 1 into two branches. The opening of the electronic expansion valve of the branch can be adjusted to adjust the heating state of one branch to be in the primary frost state, and in addition, when a single branch is defrosted, the other branch can continue to complete the heating function. The switching of the heating and defrosting functions of the two branches is realized by controlling the opening degrees of the first branch electronic expansion valve 2 and the second branch electronic expansion valve 3, and further, the alternative defrosting of the two branches is realized.
The internal pipeline of the outside heat exchanger 1 is divided into two branches: a first branch and a second branch; the first branch electronic expansion valve 2 is communicated with the first branch, and the second branch electronic expansion valve 3 is communicated with the second branch. The first branch and the second branch of the outer heat exchanger 1 are mutually staggered and uniformly distributed.
Fig. 1 is a schematic diagram of a heating function of the system, and the refrigerant flow direction is the same as that of heating when the system is adopted to perform single-branch defrosting. The four-way valve 7 of the system is adjusted to a heating mode, and the refrigerant flows through the first branch electronic expansion valve 2 and the second branch electronic expansion valve 3, the outer side heat exchanger 1, the four-way valve 7, the gas-liquid separator 8, the compressor 6, the four-way valve 7, the inner side heat exchanger 5, the refrigeration electronic expansion valve 4, the liquid storage tank 10 and the drying filter 9 in sequence as shown in figure 1.
The working principle of the single-outside heat exchanger multi-branch alternative defrosting air source heat pump system is analyzed according to the attached drawing 1:
when defrosting is needed, the first branch is firstly defrosted, at the moment, the first branch electronic expansion valve 2 is fully opened, the second branch electronic expansion valve 3 is throttled, and the system is switched from a heating state to a first branch defrosting state.
The first branch electronic expansion valve 2 is fully opened, the high-temperature refrigerant liquid from the inner side heat exchanger is not throttled, at the moment, the first branch can be regarded as a subcooler of the inner side heat exchanger, and the first branch of the outer side heat exchanger 1 is heated by using high-temperature waste heat carried by the high-temperature refrigerant liquid discharged by the inner side heat exchanger 5 to achieve defrosting. Meanwhile, the second branch electronic expansion valve 3 keeps the opening degree in the normal heating function according to the current working state, the second branch electronic expansion valve 3 continues to throttle the high-temperature refrigerant liquid from the inner side heat exchanger, the high-temperature liquid is cooled into low-temperature and low-pressure liquid after throttling, the low-temperature and low-pressure liquid flows into the pipeline of the second branch and absorbs heat from the external environment to be gasified,
the second branch continues to complete the heating function, thereby ensuring that the heating function does not stop.
In the defrosting process of the first branch, the high-temperature refrigerant liquid flowing through the first branch is further cooled into a supercooled liquid, and the low-temperature refrigerant liquid flowing through the second branch is evaporated and vaporized by absorbing heat in the external environment.
The refrigerant flows from the outside heat exchanger 1 through the four-way valve 7 to the gas-liquid separator 8, and the gas-liquid separator 8 separates the liquid refrigerant and the gas refrigerant. The gas-liquid separator 8 is connected to the compressor 6, and the compressor 6 compresses the low-temperature gas separated by the gas-liquid separator 8 to raise the temperature. The high-temperature gas compressed by the compressor 6 flows to the inner side heat exchanger 5 through the four-way valve 7, the high-temperature gas transfers heat energy to the inner side environment through the inner side heat exchanger 5, the temperature of the inner side environment is improved, and meanwhile, the high-temperature refrigerant gas for completing the inner side energy exchange is liquefied into high-temperature liquid, and the inner side heat supply function is completed.
The other end of the inner side heat exchanger 5 is connected with a refrigeration electronic expansion valve 4, refrigerant liquid flows to a liquid storage tank 10 for storing redundant refrigerant through the refrigeration electronic expansion valve 4, the other end of the liquid storage tank 10 is connected with a drying filter 9, and the drying filter 9 filters impurities generated in the circulation process. The filtered high-temperature refrigerant liquid flows to the first branch electronic expansion valve 2 and the second branch electronic expansion valve 3, and a first branch defrosting cycle is completed.
After the defrosting of the first branch is finished, the opening degree of the two electronic expansion valves is adjusted, the electronic expansion valve 2 of the first branch is adjusted to be in a normal opening degree with a heating function, the electronic expansion valve 3 of the second branch is fully opened, the defrosting of the second branch is carried out, and the alternate defrosting of the first branch and the second branch is realized.
And when the defrosting of the second branch is finished, the whole defrosting process is finished, and at the moment, the electronic expansion valves of the two branches are adjusted to the normal opening degree of the heating function, and the normal heating state is entered. By this, the defrosting of the outside heat exchanger 1 is completed.
Fig. 3 shows an arrangement of the outer heat exchanger pipes when two branches are used, which includes, but is not limited to, two arrangements, and both of the two arrangements in fig. 3 can better distribute the two branches uniformly. First branch road and the crisscross distribution each other of second branch road, can be more even defrost. When one branch is defrosted, the other branch continues to perform the heating function, and the defrosting branch and the heating branch are mutually staggered and uniformly distributed, so that the heating branch can better recover the waste heat of the high-temperature refrigerant liquid of the defrosting branch, the energy utilization efficiency can be improved, and the influence of defrosting on the heating effect is reduced.
During system refrigeration, the four-way valve 7 is adjusted to a refrigeration mode, refrigerant flows through the refrigeration electronic expansion valve 4, the inner side heat exchanger 5, the four-way valve 7, the gas-liquid separator 8, the compressor 6, the four-way valve 7, the outer side heat exchanger 1 and the heating electronic expansion valves (the first branch electronic expansion valve 2 and the second branch electronic expansion valve 3) in sequence according to the flow direction shown in fig. 2, and in the process, the heating electronic expansion valves are fully opened. The refrigerant enters the inner side heat exchanger 5 through the throttling of the refrigeration electronic expansion valve 4, evaporates and absorbs heat from the air in the inner side space, and the refrigeration function is realized. The high-temperature gas is sent into the outer heat exchanger 1 after being compressed by the compressor 6, the heat is discharged to the external environment, and the high-temperature gas enters the inner heat exchanger 5 through the throttling of the refrigeration electronic expansion valve 4 again to be evaporated and absorb heat, so that a refrigeration cycle is completed. The heat in the inner space is continuously transferred to the external environment to realize continuous refrigeration by the circulation.
Compared with the prior art, the invention has the beneficial effects that:
1) the structure is simple. The invention limits the alternately defrosting part in the single outer heat exchanger by adopting a plurality of branches and single outer heat exchanger, only needs to be equipped with corresponding electronic expansion valves according to the number of the branches for control, and does not need to add extra valves such as four-way valves, electromagnetic valves and the like. Therefore, defrosting can be realized without more than two groups of outer heat exchangers and fans, and the structure is simple. The invention is beneficial to the miniaturization and light weight of the system structure, and the volume and the weight of the system can not be increased.
2) The energy is saved. The invention adopts the mode that the high-temperature refrigerant liquid discharged by the inner heat exchanger directly enters the outer heat exchanger for defrosting, and the defrosting is carried out by utilizing the high-temperature waste heat of the refrigerant completing the heating cycle, so that the extra electric energy is not consumed.
3) The control is simple. During defrosting, the switching of heating and defrosting functions and the switching of the alternate defrosting functions of the two branches can be completed only by adjusting the opening degrees of the electronic expansion valves of the two outer branches.
4) The heating effect is not reduced. When the single branch defrosting is carried out, the other branch can continuously complete the heating function. The two branches are designed to be mutually staggered and uniformly distributed, so that the heating branch is favorable for recovering the waste heat of the high-temperature refrigerant liquid of the defrosting branch. The waste heat of the high-temperature refrigerant liquid of the defrosting branch circuit is transferred to the heating branch circuit through heated air, so that the heat exchange effect of the heating branch circuit is enhanced, and the heat absorption capacity of the low-temperature refrigerant of the heating branch circuit is increased.
During the single branch road defrosting, though outside heat exchanger evaporation area reduces during the defrosting, but through retrieving the waste heat of defrosting branch road high temperature refrigerant liquid, promoted the heat transfer difference in temperature, can not obviously influence inboard heating effect, increased inboard travelling comfort.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also included in the scope of the present invention.

Claims (7)

1. A defrosting method of an air heat source pump system based on single-outside heat exchanger multi-branch alternate defrosting comprises the following steps:
s1, adjusting the first branch electronic expansion valve (2) to be in a defrosting mode, and maintaining the second branch electronic expansion valve (3) in a heating mode to defrost the first branch;
s2, after the first branch defrosting is finished, adjusting the opening degree of the electronic expansion valves of the two branches, and defrosting the second branch; in step S1, when the first branch is defrosted, the first branch electronic expansion valve (2) is fully opened, and the second branch electronic expansion valve (3) throttles; high-temperature liquid discharged by the inner side heat exchanger (5) directly enters the first branch for defrosting, and meanwhile, the second branch continues to complete the heating function; in step S2, when defrosting the second branch, the second branch electronic expansion valve (3) is fully opened, and the first branch electronic expansion valve (2) throttles; high-temperature liquid discharged by the inner side heat exchanger (5) directly enters the second branch circuit for defrosting, and meanwhile, the first branch circuit continues to complete the heating function;
the pipelines of the first branch and the second branch are mutually staggered and evenly distributed, and any two adjacent pipelines are two first branches and the other two second branches.
2. The defrosting method of the air heat source pump system based on the single-outside heat exchanger multi-branch alternative defrosting is characterized by comprising at least three electronic expansion valves, wherein defrosting is carried out by dividing into at least three branches; by controlling the opening of the electronic expansion valve, the single branch is defrosted, and other branches are heated; and defrosting other branches in sequence.
3. The defrosting method of the air heat source pump system based on the single-outside heat exchanger multi-branch alternate defrosting according to the claim 1 or 2, wherein the heat source pump system comprises: an outer heat exchanger (1) and an inner heat exchanger (5); one end of the outer side heat exchanger (1) is connected with a first branch electronic expansion valve (2) and a second branch electronic expansion valve (3); the switching of the heating and defrosting functions of the first branch and the second branch is realized by controlling the opening degrees of the first branch electronic expansion valve (2) and the second branch electronic expansion valve (3).
4. The defrosting method of the air heat source pump system based on the single-outside heat exchanger and multi-branch alternate defrosting is characterized in that the other end of the outside heat exchanger (1) is connected with a four-way valve (7); the four-way valve (7) is connected with a gas-liquid separator (8); the gas-liquid separator (8) is connected with the compressor (6), and the gas-liquid separator (8) separates gas and leads the gas into the compressor (6).
5. The defrosting method of the air heat source pump system based on the single-outside heat exchanger and multi-branch alternate defrosting according to the claim 4, characterized in that the compressor (6) is connected with one end of the inside heat exchanger (5) through a four-way valve (7); the compressor (6) compresses a low-temperature refrigerant gas to raise the temperature.
6. The defrosting method of the air heat source pump system based on the single-outer side heat exchanger and the multi-branch alternative defrosting is characterized in that the other end of the inner side heat exchanger (5) is connected with a refrigeration electronic expansion valve (4); the refrigeration electronic expansion valve (4) is connected with one end of a liquid storage tank (10) for storing redundant refrigerant.
7. The defrosting method of the air heat source pump system based on the single-outside heat exchanger and multi-branch alternate defrosting is characterized in that the other end of the liquid storage tank (10) is connected with a drying filter (9); the drying filter (9) is connected with the first branch electronic expansion valve (2) and the second branch electronic expansion valve (3); the drying filter (9) is used for filtering impurities generated in the circulating process.
CN201910028130.9A 2019-01-11 2019-01-11 Defrosting method of air source heat pump system based on single-outside heat exchanger multi-branch alternate defrosting Active CN109579387B (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995015467A1 (en) * 1993-12-02 1995-06-08 M.C. International Refrigerating exchanger, method for controlling same, and refrigeration facility comprising said exchanger
CN203731763U (en) * 2014-01-29 2014-07-23 平武臣 Medium-high-temperature heating and defrosting system of heat pump system
CN204612220U (en) * 2015-01-21 2015-09-02 深圳市沃森空调技术有限公司 Segmentation defrosting air-conditioner
CN105004114A (en) * 2015-07-02 2015-10-28 Tcl空调器(中山)有限公司 Air conditioner and defrosting method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995015467A1 (en) * 1993-12-02 1995-06-08 M.C. International Refrigerating exchanger, method for controlling same, and refrigeration facility comprising said exchanger
CN203731763U (en) * 2014-01-29 2014-07-23 平武臣 Medium-high-temperature heating and defrosting system of heat pump system
CN204612220U (en) * 2015-01-21 2015-09-02 深圳市沃森空调技术有限公司 Segmentation defrosting air-conditioner
CN105004114A (en) * 2015-07-02 2015-10-28 Tcl空调器(中山)有限公司 Air conditioner and defrosting method thereof

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