CN112128838A - Frost prevention heat pump system - Google Patents
Frost prevention heat pump system Download PDFInfo
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- CN112128838A CN112128838A CN202010969407.0A CN202010969407A CN112128838A CN 112128838 A CN112128838 A CN 112128838A CN 202010969407 A CN202010969407 A CN 202010969407A CN 112128838 A CN112128838 A CN 112128838A
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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
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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
- 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
- F25B47/02—Defrosting cycles
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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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- 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
- F24D2200/00—Heat sources or energy sources
- F24D2200/12—Heat pump
- F24D2200/123—Compression type heat pumps
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- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a frost prevention heat pump system, which comprises: a first heat exchange medium circulation system comprising: a first heat exchanger having a first circulation passage and a second circulation passage; a second heat exchanger having a third circulation passage and a fourth circulation passage; a compressor driving a first heat exchange medium to circulate between the first circulation channel and the third circulation channel; a second heat exchange medium circulation system comprising: a third heat exchanger; a heat exchange fan; the first driving mechanism drives a second heat exchange medium to circularly flow between the third heat exchanger and the second circulating channel, and the second heat exchange medium is liquid anti-freezing solution; the fourth circulating channel is connected with a water using end. The frost prevention heat pump system can effectively prevent the heat exchanger located outdoors from frosting and improve the heat exchange efficiency.
Description
Technical Field
The invention belongs to the technical field of air conditioning, and particularly relates to a frost prevention heat pump system.
Background
At present, the regional heating in China mostly adopts fossil energy heating mainly comprising fuel oil and coal-fired boilers and other various heat pump heating systems utilizing low-grade energy, such as air source heat pump systems. The fossil energy heating has the problems of high-grade energy consumption, low energy primary utilization rate, accompanying air pollution, haze and the like. And the air source heat pump is adopted for heating, although the air can be heated by using low-grade heat energy in the air, the excessive consumption of fossil energy is avoided.
The air source heat pump has a great disadvantage that the low temperature adaptability is poor in a low-temperature and high-humidity area. When the air source heat pump operates at the outdoor environment temperature lower than zero, the surface temperature of the outdoor heat exchanger is lower than the dew point temperature of vapor in the air, when the vapor is condensed on the surface of the heat exchanger, because the temperature of the heat exchanger is lower than zero, condensed water can quickly form a frost layer on the surface of the heat exchanger, the thickness of the frost layer is gradually increased along with the increase of the operation time, the air intake of the outdoor source side heat exchanger is reduced, the evaporation temperature of a refrigerant in the source side heat exchanger is reduced, the system pressure ratio is increased, the exhaust temperature is continuously increased, the refrigerating capacity is reduced, various performance parameters of the system are greatly reduced, the operation effect is rapidly deteriorated, and the system has to perform defrosting control on the unit at fixed time intervals.
Therefore, the frosting problem is always a restrictive problem of the popularization and development of the air source heat pump in northern severe cold areas and southern low-temperature high-humidity areas.
Disclosure of Invention
The invention provides a frost prevention heat pump system aiming at the technical problems that the existing heat pump system is easy to frost in a low-temperature environment and has poor adaptability, and can solve the problems.
In order to realize the purpose of the invention, the invention is realized by adopting the following technical scheme:
a frost prevention heat pump system comprising:
a first heat exchange medium circulation system comprising:
a first heat exchanger having a first circulation passage and a second circulation passage;
a second heat exchanger having a third circulation passage and a fourth circulation passage;
a compressor driving a first heat exchange medium to circulate between the first circulation channel and the third circulation channel;
a second heat exchange medium circulation system comprising:
a third heat exchanger;
a heat exchange fan;
the first driving mechanism drives a second heat exchange medium to circularly flow between the third heat exchanger and the second circulating channel, and the second heat exchange medium is liquid anti-freezing solution;
the fourth circulating channel is connected with a water using end.
Further, the first heat exchange medium is a refrigerant with a variable phase state.
Further, the defrosting device also comprises a defrosting heat exchanger, and the defrosting heat exchanger is connected with the third heat exchanger.
Furthermore, the defrosting heat exchanger is provided with a fifth circulation channel, one of the outlets of the third heat exchanger is connected with the inlet of the second circulation channel, the other one of the outlets of the third heat exchanger is connected with the inlet of the fifth circulation channel, the inlet of the third heat exchanger is connected with the first driving mechanism, one of the outlets of the first driving mechanism is connected with the outlet of the second circulation channel, the other one of the outlets of the second circulation channel is connected with the outlet of the fifth circulation channel, a first valve used for controlling the second circulation channel to be communicated with the third heat exchanger is arranged at the inlet and/or the outlet of the second circulation channel, a second valve used for controlling the fifth circulation channel to be communicated with the third heat exchanger is arranged at the inlet or the outlet of the fifth circulation channel, and the first valve and the second valve are not opened at the same time.
Furthermore, the defrosting heat exchanger further comprises a sixth circulating channel, the sixth circulating channel is connected with the water tank, and a second driving mechanism is arranged in a pipeline connecting the sixth circulating channel with the water tank.
Further, an outlet of the fourth circulation channel is connected with the water tank, and the water tank is connected with a water using end.
Further, the first heat exchanger and the defrosting heat exchanger are plate heat exchangers, the second heat exchanger is a shell-and-tube heat exchanger, and the third heat exchanger is a fin heat exchanger.
Furthermore, the third heat exchanger is also connected with a liquid supplementing mechanism.
Further, one side of the third heat exchanger facing the heat exchange fan and one side of the third heat exchanger facing away from the heat exchange fan are respectively provided with a wind speed detection module;
the anti-frost heat pump system comprises a defrosting condition judgment step:
and detecting the current of the heat exchange fan, calculating a difference value of wind speeds at two sides of the third heat exchanger when the current of the heat exchange fan is not less than a current reference value, executing defrosting operation when the difference value of the wind speeds at two sides of the third heat exchanger is not less than the wind speed reference value, controlling the third heat exchanger to be communicated with the defrosting heat exchanger, and simultaneously disconnecting the third heat exchanger from the second circulating channel.
Further, before the defrosting condition judging step, the starting operation time of the anti-frost heat pump system is judged, and when the starting operation time meets the set time, the defrosting condition is judged.
Compared with the prior art, the invention has the advantages and positive effects that: the frost prevention heat pump system comprises a first heat exchange medium circulating system and a second heat exchange medium circulating system, wherein an antifreeze solution is adopted as a second heat exchange medium circulating to a third heat exchanger, the antifreeze solution only exchanges heat with sensible heat, the antifreeze solution exchanges heat with air in the third heat exchanger with small temperature difference, the temperature slippage of wet air near fins is small, the growth process of a frost layer is mostly in a frost crystal growth period, and the large-area and large-thickness frost layer cannot be formed. And secondly, because the antifreeze does not have phase change in the third heat exchanger and is in a liquid state in the third heat exchanger all the time, the antifreeze in the heat pipe can fully utilize the heat exchange area of the pipe wall, the flooded equivalent circulation is realized, the heat exchange area of the whole third heat exchanger can be fully utilized by 100 percent, and the heat exchange performance is good. And thirdly, applying a power source to the heat absorbed by the third heat exchanger through a low-temperature anti-freezing liquid level heat carrier through the first driving mechanism, entering the first heat exchanger, exchanging heat with the refrigerant in the first heat exchanger, and exchanging heat to the refrigerant to realize the stepped transfer of heat. The heated refrigerant enters the second heat exchanger, releases heat in the second heat exchanger, is used for heating circulating water in the second heat exchanger, and is finally provided for a user side, so that the upgrading and utilization of heat from the third heat exchanger are realized.
Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a system schematic diagram of an embodiment of the anti-frost heat pump system according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and examples.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Example one
This embodiment has proposed a frost prevention heat pump system, as shown in fig. 1, includes first heat transfer medium circulation system and second medium circulation system, and wherein, first heat transfer medium circulation system includes:
a first heat exchanger 11 having a first circulation passage and a second circulation passage;
a second heat exchanger 12 having a third circulation passage and a fourth circulation passage;
a compressor 13 that drives the first heat exchange medium to circulate between the first circulation passage and the third circulation passage;
the second heat exchange medium circulation system includes:
a third heat exchanger 14;
a heat exchange fan 15;
the first driving mechanism 16 drives a second heat exchange medium to circularly flow between the third heat exchanger 14 and the second circulation channel of the first heat exchanger 11, wherein the second heat exchange medium is liquid anti-freezing solution;
the fourth circulating channel is connected with the water using end, namely, water circulates in the fourth circulating channel.
The first heat exchange medium and the second heat exchange medium are made of different materials.
The frost prevention heat pump system of this embodiment, the third heat exchanger is placed in the open air, absorb the heat in the outdoor air by the second heat transfer medium, at first, through setting up first heat transfer medium circulation system and second heat transfer medium circulation system, wherein, the second heat transfer medium who circulates to the third heat exchanger adopts antifreeze, because antifreeze heat transfer is only sensible heat transfer, antifreeze carries out little difference in temperature heat transfer with the air in the third heat exchanger, the temperature of humid air near the fin slides less, because the process that the fin generates the frost layer is attached to the air, it is positive correlation with the heat transfer difference in temperature between air and the fin. Namely, the larger the temperature difference, the more serious the frost formation of the frost layer. The heat exchange is carried out by small temperature difference, the growth stage of a frost layer near the fins can be controlled to be in a frost crystal growth period, the frost layer in the frost crystal growth period is not easy to attach, and most of the fins can be blown away by large air volume by using the wide-distance low-resistance fin structure. Can prevent frost layer accumulation in long-term operation, and then can not form the frost layer of large tracts of land, big thickness.
And secondly, because the antifreeze does not have phase change in the third heat exchanger and is in a liquid state in the third heat exchanger all the time, the antifreeze in the heat pipe can fully utilize the heat exchange area of the pipe wall, the flooded equivalent circulation is realized, the heat exchange area of the whole third heat exchanger can be fully utilized by 100 percent, and the heat exchange performance is good.
And thirdly, applying a power source to the heat absorbed by the second heat exchange medium in the third heat exchanger through the low-temperature anti-freezing liquid level heat carrier by using the first driving mechanism, allowing the heat to enter the first heat exchanger to exchange heat with the refrigerant in the first heat exchanger, and allowing the heat to be exchanged into the refrigerant to realize the stepped transfer of the heat. The heated refrigerant enters the second heat exchanger, releases heat in the second heat exchanger, is used for heating circulating water in the second heat exchanger, and is finally provided for a user side, so that the upgrading and utilization of heat from the third heat exchanger are realized.
In this embodiment, it is preferable that the first heat exchange medium is a refrigerant with a variable phase state, and when the refrigerant circulates into the first heat exchanger 11, the refrigerant undergoes a phase change to absorb heat of latent heat and sensible heat in the second heat exchange medium, and does not absorb heat in air, so that the first heat exchanger does not frost. In the first heat exchanger 11, heat is exchanged to the refrigerant, which is used to heat the water passing through the second heat exchanger when circulating to the second heat exchanger, and finally the heat is transferred to the water. Because water is finally supplied to the user for use, the scheme can not cause the frosting of the third heat exchanger with large area and high density when meeting the requirement of heating water of the user, therefore, the heat pump system has stronger adaptability and can be also suitable for low-temperature areas and high-humidity areas.
In the scheme, the antifreezing solution is adopted to absorb heat in outdoor air, and the small temperature difference heat exchange is not beneficial to frosting the surface of the third heat exchanger 14. In order to prevent the heat pump system from thickening the frost layer on the surface of the third heat exchanger 14 due to long-time operation and finally affecting the heat exchange efficiency, it is preferable to have a defrosting logic, the existing heat pump system performs defrosting by controlling the refrigerant reverse circulation, that is, a high-temperature refrigerant is circulated to the outdoor third heat exchanger 14, and the frost layer on the surface is melted, but the problem is caused that the heat exchanger for heating water becomes an evaporator, which causes a decrease in water temperature and affects normal use of hot water by a user, or air conditioning by a hot water user, which affects the heating effect and reduces user experience.
In this embodiment, it is preferable that the defrosting heat exchanger 17 is further included, and the defrosting heat exchanger 17 is connected to the third heat exchanger 14. When defrosting is required, the refrigerant is circulated to the defrosting heat exchanger 17, and the defrosting heat exchanger 17 absorbs heat to defrost, so that hot water for the user terminal is not affected.
As shown in the figure, the defrosting heat exchanger 17 of this embodiment has a fifth circulation channel, one of the outlets of the third heat exchanger 14 is connected to the inlet of the second circulation channel, the other of the outlets of the third heat exchanger 14 is connected to the inlet of the fifth circulation channel, the inlet of the third heat exchanger 14 is connected to the first driving mechanism 16, one of the outlets of the first driving mechanism 16 is connected to the outlet of the second circulation channel, the other of the outlets of the fifth circulation channel is connected to the inlet and/or the outlet of the second circulation channel, and the first valve 18 for controlling the communication between the second heat exchanger and the third heat exchanger 14 is disposed at the inlet and/or the outlet of the second. In this embodiment, the first valves 18 are respectively provided at the inlet and the outlet of the second circulation passage, thereby improving the reliability of the control.
The inlet or outlet of the fifth circulation passage is provided with a second valve 19 for controlling communication with the third heat exchanger, and the first valve 18 and the second valve 19 are not opened at the same time.
When heating water, the first valve 18 is opened, the second valve 19 is closed, and the second heat exchange medium flows out of the third heat exchanger 14, enters the first heat exchanger to release heat, and does not enter the defrosting heat exchanger 17. During defrosting, the first valve 18 is closed, the second valve 19 is opened, and the second heat exchange medium flows out of the third heat exchanger 14, enters the defrosting heat exchanger 17 to absorb heat, and then circulates to the third heat exchanger 14 to release heat and defrost, and does not enter the first heat exchanger 11 any more.
In order to provide a heat source for the second heat exchange medium during defrosting, the defrosting heat exchanger 17 in this embodiment further includes a sixth circulation channel, the sixth circulation channel is connected to the water tank 20, and a second driving mechanism 21 is disposed in a pipeline connecting the sixth circulation channel and the water tank. The water tank 20 stores hot water, and when defrosting, the second driving mechanism 21 drives the hot water to circulate to the defrosting heat exchanger 17 for heating the second heat exchange medium circulating to the defrosting heat exchanger 17, so that defrosting can be performed in the third heat exchanger 14.
In order to prevent the energy consumption loss caused by the wrong defrosting, the defrosting judgment is further included in the embodiment, in the current mode, the running time of the starting machine is timed, and the defrosting is performed when the running time meets a certain value. The mode is judged only according to experience, the precision is poor, and the condition influencing frosting is related to the ambient temperature and the ambient humidity. In order to solve the problem, in this embodiment, a wind speed detection module is respectively arranged on one side of the third heat exchanger facing the heat exchange fan and one side of the third heat exchanger facing away from the heat exchange fan;
the anti-frost heat pump system comprises a defrosting condition judgment step:
and detecting the current of the heat exchange fan, calculating the difference value of the wind speeds of two sides of the third heat exchanger when the current of the heat exchange fan is not less than the current reference value, executing defrosting operation when the difference value of the wind speeds of two sides of the third heat exchanger is not less than the wind speed reference value, controlling the third heat exchanger to be communicated with the defrosting heat exchanger, and simultaneously disconnecting the third heat exchanger from the second circulating channel.
When the frost layer of the third heat exchanger 14 reaches a certain thickness, the wind resistance in the air duct is increased, the air quantity is attenuated, and the load of the heat exchange fan is increased at the moment. After the load is increased, the fan current (which can also be equivalently used for detecting the fan power) which is a directly related parameter is increased, and the frost thickness and the fan current increase relationship are positively correlated. The frost formation degree can be briefly estimated by detecting a change in the fan current. In order to eliminate the possibility of system misjudgment, detection reliability is ensured. And a layer of detection is added to detect the difference value of the front and rear air inlet and outlet speeds of the heat exchanger. The principle is as follows: when the frost layer is accumulated to a certain thickness, most of the air flow circulation area is occupied, the circulation air speed difference value in front of and behind the heat exchanger is increased, and when the air speed difference value is increased to a set value and the current value is larger than the set value, the system judges that the third heat exchanger 14 is frosted and carries out defrosting action.
The double coupling of this scheme utilization heat transfer fan electric current and combination air flow rate is judged, can directly be related to frost layer thickness to the influence law of judging the parameter, need not to carry out indirect judgement, judges more to accord with the real condition, judges to need the defrosting after, and the defrosting process time is short, and whole journey need not to shut down, does not shut down the defrosting, has reduced the influence to system operation performance, has improved the stability of system.
Before the defrosting condition judging step, the starting operation time of the anti-frost heat pump system is judged, and when the starting operation time meets the set time, the defrosting condition is judged.
The water tank 20 should have a certain thermal insulation and heat storage capacity to prevent heat loss, and the heat source can be stored through solar heat storage and electric heating heat storage.
As shown in the figure, in this embodiment, the outlet of the fourth circulation path of the second heat exchanger 12 is connected to the water tank 20, and the water tank 20 is connected to the water using end. In this embodiment, the hot water produced during the heating operation of the heat pump system is first input into the water tank 20, and then is supplied to the user side through the water tank 20, so that the water in the water tank 20 is always hot water, and when defrosting, the second heat exchange medium is heated by circulating the hot water in the water tank 20 to the defrosting heat exchanger 17. Because the second heat exchange medium is antifreeze, which can only absorb sensible heat, the temperature of the circulating hot water cannot be reduced too low, and the normal use of a user cannot be influenced. In addition, since the water tank 20 has a certain water capacity, when the heating operation is performed again after the defrosting is finished, the hot water produced by the heat pump system is continuously input into the water tank 20, and is mixed with the water with the reduced temperature in the water tank 20 and then is provided to the user, so the temperature of the output hot water of the water tank 20 is also not too low.
The scheme does not need to utilize high-temperature refrigerant to perform reverse circulation defrosting like a vortex type air source heat pump, and does not need to introduce extra electric heat energy to perform electric heating defrosting. Only need through flow path control, when judging that need the defrosting, only need open heat accumulation defrosting water tank, it can to defrost to carry out, practices thrift the electric energy when improving system stability.
The first heat exchanger 11 and the defrosting heat exchanger 17 are preferably implemented by plate heat exchangers, and have two circulation channels inside. The second heat exchanger 12 is preferably implemented as a shell-and-tube heat exchanger, which can increase the hot water output of the heat pump. The third heat exchanger 14 is disposed outdoors and used for exchanging heat between the second heat exchange medium and the outdoor air, and therefore the third heat exchanger 14 is implemented by using a fin-type heat exchanger. When the third heat exchanger 14 is a fin heat exchanger, a heat exchange fan should be further disposed on one side of the third heat exchanger for accelerating air flow and improving heat exchange efficiency.
In order to prevent the second heat exchange medium from running off and reducing the heat exchange capacity due to long-term operation, it is preferable that the third heat exchanger 14 is further connected with a liquid replenishing mechanism 21. When the second heat exchange medium is reduced, it is used for replenishment.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (10)
1. A frost prevention heat pump system, comprising:
a first heat exchange medium circulation system comprising:
a first heat exchanger having a first circulation passage and a second circulation passage;
a second heat exchanger having a third circulation passage and a fourth circulation passage;
a compressor driving a first heat exchange medium to circulate between the first circulation channel and the third circulation channel;
a second heat exchange medium circulation system comprising:
a third heat exchanger;
a heat exchange fan;
the first driving mechanism drives a second heat exchange medium to circularly flow between the third heat exchanger and the second circulating channel, and the second heat exchange medium is liquid anti-freezing solution;
the fourth circulating channel is connected with a water using end.
2. The frost prevention heat pump system of claim 1, wherein the first heat exchange medium is a variable phase refrigerant.
3. The frost prevention heat pump system of claim 1, further comprising a defrosting heat exchanger coupled to the third heat exchanger.
4. The frost prevention heat pump system of claim 3, wherein the defrosting heat exchanger has a fifth circulation passage, one of outlets of the third heat exchanger is connected to an inlet of the second circulation passage, the other path is connected with an inlet of the fifth circulating channel, an inlet of the third heat exchanger is connected with the first driving mechanism, one path of the first driving mechanism is connected with an outlet of the second circulating channel, the other path of the second circulating channel is connected with an outlet of the fifth circulating channel, a first valve used for controlling the second circulating channel to be communicated with the third heat exchanger is arranged at an inlet and/or an outlet of the second circulating channel, and a second valve for controlling the fifth circulation channel to be communicated with the third heat exchanger is arranged at the inlet or the outlet of the fifth circulation channel, and the first valve and the second valve are not opened at the same time.
5. The frost prevention heat pump system of claim 3, wherein the defrosting heat exchanger further comprises a sixth circulation channel, the sixth circulation channel is connected with the water tank, and a second driving mechanism is arranged in a pipeline connecting the sixth circulation channel with the water tank.
6. The frost prevention heat pump system of claim 4, wherein an outlet of the fourth circulation passage is connected to the water tank, and the water tank is connected to a water using end.
7. The frost protection heat pump system of claim 3, wherein the first heat exchanger and the defrosting heat exchanger are plate heat exchangers, the second heat exchanger is a shell and tube heat exchanger, and the third heat exchanger is a finned heat exchanger.
8. The frost prevention heat pump system of any of claims 1 to 7, wherein a fluid replacement mechanism is further connected to the third heat exchanger.
9. The frost prevention heat pump system of claim 8,
one side of the third heat exchanger facing the heat exchange fan and one side of the third heat exchanger facing away from the heat exchange fan are respectively provided with a wind speed detection module;
the anti-frost heat pump system comprises a defrosting condition judgment step:
and detecting the current of the heat exchange fan, calculating a difference value of wind speeds at two sides of the third heat exchanger when the current of the heat exchange fan is not less than a current reference value, executing defrosting operation when the difference value of the wind speeds at two sides of the third heat exchanger is not less than the wind speed reference value, controlling the third heat exchanger to be communicated with the defrosting heat exchanger, and simultaneously disconnecting the third heat exchanger from the second circulating channel.
10. The frost prevention heat pump system of claim 9, wherein the defrosting condition determining step further comprises determining a startup operation time of the frost prevention heat pump system, and when the startup operation time meets a set time, performing defrosting condition determination.
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| CN109210840A (en) * | 2018-09-12 | 2019-01-15 | 珠海格力电器股份有限公司 | A kind of Air-Cooled Heat Pump Unit and its defrosting control method |
| CN109323372A (en) * | 2018-10-17 | 2019-02-12 | 青岛海尔空调器有限总公司 | Air conditioner defrosting control method |
| CN110793239A (en) * | 2019-10-10 | 2020-02-14 | 青岛新欧亚能源有限公司 | Large-scale air source heat pump frosting judgment and online defrosting system and method |
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