CN114087716A - Air source heat pump defrosting control system and control method - Google Patents
Air source heat pump defrosting control system and control method Download PDFInfo
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- CN114087716A CN114087716A CN202111163441.XA CN202111163441A CN114087716A CN 114087716 A CN114087716 A CN 114087716A CN 202111163441 A CN202111163441 A CN 202111163441A CN 114087716 A CN114087716 A CN 114087716A
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- 238000010257 thawing Methods 0.000 title claims abstract description 108
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000001514 detection method Methods 0.000 claims abstract description 20
- 230000000694 effects Effects 0.000 claims abstract description 16
- 239000003507 refrigerant Substances 0.000 claims abstract description 13
- 239000003570 air Substances 0.000 claims description 89
- 230000008020 evaporation Effects 0.000 claims description 24
- 238000001704 evaporation Methods 0.000 claims description 24
- 238000004378 air conditioning Methods 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 10
- 230000008901 benefit Effects 0.000 claims description 7
- 230000009977 dual effect Effects 0.000 claims description 6
- 238000007664 blowing Methods 0.000 claims description 5
- 238000005265 energy consumption Methods 0.000 claims description 5
- 230000001012 protector Effects 0.000 claims description 5
- 230000004044 response Effects 0.000 claims description 5
- 230000002159 abnormal effect Effects 0.000 claims description 4
- 239000012080 ambient air Substances 0.000 claims description 4
- 230000002411 adverse Effects 0.000 abstract description 3
- 239000003245 coal Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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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
- F25B30/06—Heat pumps characterised by the source of low potential heat
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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
- F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
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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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- 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
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/20—Humidity
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Signal Processing (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention relates to the technical field of air source heat pump defrosting, and discloses an air source heat pump defrosting control system and a control method. This air source heat pump defrosting control system and control method, through the compressor, realize the effect to indoor heat supply when defrosting, through indoor heat exchanger, the defrosting can send hot-blast effect immediately after accomplishing the back indoor, through two-way valve one and two-way valve two, compressor exhaust high temperature high pressure refrigerant flows into outdoor heat exchanger release heat and realizes the effect of defrosting, through outdoor double sensor, avoided the detection to outdoor parameter, do not receive the influence of outdoor environment humidity, avoided outdoor adverse circumstances to electrically controlled device's influence, the reliability is improved.
Description
Technical Field
The invention relates to the technical field of air source heat pump defrosting, in particular to an air source heat pump defrosting control system and a control method.
Background
In recent years, in order to reduce the coal pollution in winter and improve the air quality, a plurality of cities in the north of China begin to popularize 'coal changes into electricity', and a series of policies are subsidized and correspondingly discharged. The air source heat pump heating is one of the modes of changing coal into electricity, no local emission exists during the operation, and the emission reduction ratio is 100%; and the tail end of the air source heat pump is convenient to install and can be free of maintenance. Compared with the aspects of economic benefit, emission reduction effect and operation and maintenance, the air source heat pump heating is the best scheme for realizing coal replacement in northern rural areas.
The prior art has the following defects and shortcomings: however, the air source heat pump is greatly affected by outdoor environment, and when the air source heat pump continuously operates at low ambient temperature in winter to supply heat to the indoor, the outdoor coil is frosted, so that the heat transfer performance of the outdoor coil is weakened, and the air flow between the outdoor coils is blocked, so that the system cannot normally work.
The existing equipment can not continue to supply heat to the indoor space while defrosting, hot air can not be immediately supplied after defrosting, and most of equipment has the influence of external environment humidity during defrosting.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a defrosting control system and a control method of an air source heat pump, which can solve the problems of the prior defrosting control system and the prior control method of the air source heat pump; this device is through setting up the compressor, realizes the effect to indoor heat supply in the defrosting, and the defrosting is accomplished the back indoor hot-blast effect of sending immediately, flows into outdoor heat exchanger release heat from compressor exhaust high temperature high pressure refrigerant and realizes the effect of defrosting, has avoided the detection to outdoor parameter, does not receive the influence of outdoor environment humidity, has avoided outdoor adverse circumstances to electrically controlled device's influence, has improved the effective solution problem of reliability.
In order to achieve the purpose of the air source heat pump defrosting control system and the control method, the invention provides the following technical scheme: an air source heat pump defrosting control system comprises a compressor, an indoor heat exchanger, an outdoor double sensor, an indoor fan, a two-way valve II, a two-way valve I, an electronic expansion valve, a filter and a detector.
Preferably, the outdoor heat exchanger and the outdoor dual sensor are both installed in an outdoor environment.
Preferably, the two ends of the detector are connected with a compressor and an outdoor heat exchanger, the compressor and the outdoor heat exchanger are separately connected with each other, and the periphery of the detector is further connected with an outdoor double sensor.
Preferably, the outdoor double sensor is internally provided with detection sensors for detecting the outdoor ambient temperature and the surface temperature of the evaporator coil.
Preferably, the method comprises the following steps:
the air conditioner heats and operates: when the air conditioner heats, the plug-in unit can freeze and frost, so that the air conditioner stops blowing when being blocked, enters an automatic defrosting state, and the panel lamp can continuously flash.
Preferably, the method comprises the following steps of judging the air temperature and the air humidity to need defrosting:
starting an outdoor double sensor: the system comprises an outdoor environment temperature detection sensor and an outdoor evaporation coil surface temperature detection sensor:
detecting the outdoor environment temperature: detecting whether the outdoor environment temperature is lower than 0 ℃;
detecting the surface temperature of the outdoor evaporation coil: whether the surface temperature of the outdoor evaporation coil is lower than the dew point temperature of the ambient air or not is judged, the surface temperature of the outdoor evaporation coil depends on the evaporation temperature of the refrigerant under the influence of the ambient temperature, and the dew point temperature of the air is influenced by the relative humidity, so that the temperature and the humidity of the air become main judgment bases for judging whether the surface of the outdoor heat exchanger of the heat pump system is frosted or not.
Preferably, if the air temperature and the air humidity need defrosting, if the values are abnormal, the next step is carried out:
the method comprises the following steps: the indoor fan runs at an ultra-low speed: the inner fan is started during defrosting, so that heat is supplied to the indoor space while defrosting is realized, and great contribution is made to indoor comfort;
step two: opening a first two-way valve and a second two-way valve: used for controlling the fan coil;
step three: opening the electronic expansion valve: the indoor heat exchanger has the advantages of being energy-saving, high in precision, high in response speed and the like, can be used for controlling the air conditioning system in a comfortable and energy-saving mode, and enables the air supply temperature of the indoor heat exchanger not to be lowered too much, so that the energy consumption of operations such as air conditioning defrosting is saved, the comfort of a user is enhanced, the effect of a safety protector can be achieved, and the system performance and the efficiency are higher.
Preferably, the method comprises the following steps of detecting the defrosting progress:
if the defrosting is not finished, the indoor fan continues to be driven to run at the ultra-low speed under the control of the detector, the steps are continued, the defrosting progress is finished, the defrosting step is finished, and a normal heating mode is carried out.
Compared with the prior art, the invention provides a defrosting control system and a defrosting control method for an air source heat pump, which have the following beneficial effects:
1. an air source heat pump defrosting control system is characterized in that a compressor is arranged, when defrosting is carried out through the compressor, a part of exhaust gas is still introduced into an indoor heat exchanger, the temperature of the indoor heat exchanger is kept at a high level, heat can be dissipated to the indoor through a natural convection mode, and sometimes even an indoor fan can be started during defrosting, so that the effect of supplying heat to the indoor while defrosting is achieved;
2. an air source heat pump defrosting control system has the advantages that through the arrangement of an indoor heat exchanger, a four-way valve is not reversed during defrosting, a compressor is not stopped, the indoor heat exchanger keeps high temperature during defrosting, and hot air can be immediately sent to the indoor space after defrosting is finished;
3. a defrosting control system of an air source heat pump is characterized in that a first two-way valve and a second two-way valve are arranged, a detector controls switches of the first two-way valve and the second two-way valve to realize connection and disconnection of a refrigerant flow path, defrosting and heating switching is realized, when defrosting is needed, the first two-way valve and the second two-way valve are opened to realize connection of the refrigerant flow path, and high-temperature and high-pressure refrigerant discharged from a compressor flows into an outdoor heat exchanger to release heat to realize a defrosting effect;
4. the utility model provides an air source heat pump defrosting control system, through setting up outdoor double sensor, through detecting indoor ambient temperature and condenser coil surface temperature and the difference between the two as defrosting judgement basis, this kind of method has avoided the detection to outdoor parameter, does not receive the influence of outdoor ambient humidity, has avoided the influence of outdoor adverse circumstances to electrically controlled device, has improved the reliability, and can directly utilize indoor set temperature sensor, the cost is reduced.
Drawings
FIG. 1 is a diagram of an air source heat pump defrost control system according to the present invention;
fig. 2 is a diagram of a defrosting control method of an air source heat pump according to the present invention.
In the figure: 1. a compressor; 2. an indoor heat exchanger; 3. an outdoor heat exchanger; 4. outdoor double sensors; 5. an indoor fan; 6. a second two-way valve; 7. a first two-way valve; 8. an electronic expansion valve; 9. a filter; 10. a detector.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
referring to fig. 1, an air source heat pump defrosting control system includes a compressor 1, an indoor heat exchanger 2, an outdoor heat exchanger 3, an outdoor dual sensor 4, an indoor fan 5, a two-way valve two 6, a two-way valve one 7, an electronic expansion valve 8, a filter 9, and a detector 10. The outdoor heat exchanger 3 and the outdoor dual sensor 4 are both installed in an outdoor environment. The two ends of the detector 10 are connected with a compressor 1 and an outdoor heat exchanger 3, the compressor 1 and the outdoor heat exchanger 3 are separately connected with each other, and the periphery of the detector 10 is also connected with an outdoor double sensor 4. The outdoor double sensor 4 is internally provided with detection sensors for the outdoor ambient temperature and the surface temperature of the evaporator coil.
Example two:
referring to fig. 2, a defrosting control method for an air source heat pump includes the following steps:
the air conditioner heats and operates: when the air conditioner heats, the plug-in unit can freeze and frost, so that the air conditioner stops blowing when being blocked, enters an automatic defrosting state, and the panel lamp can continuously flash.
The method comprises the following steps of judging air temperature and air humidity and needing defrosting:
starting an outdoor double sensor: the system comprises an outdoor environment temperature detection sensor and an outdoor evaporation coil surface temperature detection sensor:
detecting the outdoor environment temperature: detecting whether the outdoor environment temperature is lower than 0 ℃;
detecting the surface temperature of the outdoor evaporation coil: whether the surface temperature of the outdoor evaporation coil is lower than the dew point temperature of the ambient air or not is judged, the surface temperature of the outdoor evaporation coil depends on the evaporation temperature of the refrigerant under the influence of the ambient temperature, and the dew point temperature of the air is influenced by the relative humidity, so that the temperature and the humidity of the air become main judgment bases for judging whether the surface of the outdoor heat exchanger of the heat pump system is frosted or not.
If the air temperature and the air humidity need defrosting, continuing to judge whether the air temperature and the air humidity need defrosting, if the values are abnormal, entering the next step:
the method comprises the following steps: the indoor fan runs at an ultra-low speed: the inner fan is started during defrosting, so that heat is supplied to the indoor space while defrosting is realized, and great contribution is made to indoor comfort;
step two: opening a first two-way valve and a second two-way valve: used for controlling the fan coil;
step three: opening the electronic expansion valve: the indoor heat exchanger has the advantages of being energy-saving, high in precision, high in response speed and the like, can be used for controlling the air conditioning system in a comfortable and energy-saving mode, and enables the air supply temperature of the indoor heat exchanger not to be lowered too much, so that the energy consumption of operations such as air conditioning defrosting is saved, the comfort of a user is enhanced, the effect of a safety protector can be achieved, and the system performance and the efficiency are higher.
The method comprises the following steps of detecting the defrosting progress:
if the defrosting is not finished, the indoor fan continues to be driven to run at the ultra-low speed under the control of the detector, the steps are continued, the defrosting progress is finished, the defrosting step is finished, and a normal heating mode is carried out.
Example three:
referring to fig. 1-2, an air source heat pump defrosting control system includes a compressor 1, an indoor heat exchanger 2, an outdoor heat exchanger 3, an outdoor dual sensor 4, an indoor fan 5, a two-way valve two 6, a two-way valve one 7, an electronic expansion valve 8, a filter 9, and a detector 10. The outdoor heat exchanger 3 and the outdoor dual sensor 4 are both installed in an outdoor environment. The two ends of the detector 10 are connected with a compressor 1 and an outdoor heat exchanger 3, the compressor 1 and the outdoor heat exchanger 3 are separately connected with each other, and the periphery of the detector 10 is also connected with an outdoor double sensor 4. The outdoor double sensor 4 is internally provided with detection sensors for the outdoor ambient temperature and the surface temperature of the evaporator coil.
A defrosting control method of an air source heat pump comprises the following steps:
the air conditioner heats and operates: when the air conditioner heats, the plug-in unit can freeze and frost, so that the air conditioner stops blowing when being blocked, enters an automatic defrosting state, and the panel lamp can continuously flash.
The method comprises the following steps of judging air temperature and air humidity and needing defrosting:
starting an outdoor double sensor: the system comprises an outdoor environment temperature detection sensor and an outdoor evaporation coil surface temperature detection sensor:
detecting the outdoor environment temperature: detecting whether the outdoor environment temperature is lower than 0 ℃;
detecting the surface temperature of the outdoor evaporation coil: whether the surface temperature of the outdoor evaporation coil is lower than the dew point temperature of the ambient air or not is judged, the surface temperature of the outdoor evaporation coil depends on the evaporation temperature of the refrigerant under the influence of the ambient temperature, and the dew point temperature of the air is influenced by the relative humidity, so that the temperature and the humidity of the air become main judgment bases for judging whether the surface of the outdoor heat exchanger of the heat pump system is frosted or not.
If the air temperature and the air humidity need defrosting, continuing to judge whether the air temperature and the air humidity need defrosting, if the values are abnormal, entering the next step:
the method comprises the following steps: the indoor fan runs at an ultra-low speed: the inner fan is started during defrosting, so that heat is supplied to the indoor space while defrosting is realized, and great contribution is made to indoor comfort;
step two: opening a first two-way valve and a second two-way valve: used for controlling the fan coil;
step three: opening the electronic expansion valve: the indoor heat exchanger has the advantages of being energy-saving, high in precision, high in response speed and the like, can be used for controlling the air conditioning system in a comfortable and energy-saving mode, and enables the air supply temperature of the indoor heat exchanger not to be lowered too much, so that the energy consumption of operations such as air conditioning defrosting is saved, the comfort of a user is enhanced, the effect of a safety protector can be achieved, and the system performance and the efficiency are higher.
The method comprises the following steps of detecting the defrosting progress:
if the defrosting is not finished, the indoor fan continues to be driven to run at the ultra-low speed under the control of the detector, the steps are continued, the defrosting progress is finished, the defrosting step is finished, and a normal heating mode is carried out.
In summary, when the compressor 1 is used for defrosting, a part of exhaust gas is still led into the indoor heat exchanger 2, the temperature of the indoor heat exchanger 2 is kept at a high level, heat can be dissipated to the indoor through natural convection, sometimes even the indoor fan 5 can be started during defrosting, the effect of supplying heat to the indoor while defrosting is achieved, the four-way valve is not reversed during defrosting, the compressor 1 is not stopped, the indoor heat exchanger 2 is kept at a high temperature during defrosting, hot air can be immediately sent to the indoor after defrosting is completed, the detector 10 controls the switches of the two-way valve one 7 and the two-way valve two 6 to achieve the conduction and disconnection of the refrigerant flow path, the switching between defrosting and heating is achieved, when defrosting is needed, the two-way valve one 7 and the two-way valve two 6 are opened to achieve the conduction of the refrigerant flow path, and the high-temperature and high-pressure refrigerant discharged from the compressor 1 flows into the outdoor heat exchanger 3 to release heat to achieve the defrosting effect, by detecting the indoor environment temperature and the surface temperature of the condenser coil and the difference between the indoor environment temperature and the surface temperature of the condenser coil as defrosting judgment basis, the method avoids the detection of outdoor parameters, is not influenced by the outdoor environment humidity, avoids the influence of outdoor severe environment on an electric control device, improves the reliability, can directly utilize the indoor unit temperature sensor, and reduces the cost.
The working and using process and the installation method of the invention are that when the air source heat pump defrosting control system and the control method are used, the external hanging machine can be frozen and frosted by arranging the air conditioner to perform heating operation when the air conditioner heats, so that the air-conditioning will stop blowing when the air-conditioning is cut off, and enter into the automatic defrosting state, the panel lamp will flash continuously, the system comprises an outdoor environment temperature detection sensor and an outdoor evaporation coil surface temperature detection sensor, wherein the outdoor environment temperature detection sensor detects whether the outdoor environment temperature is lower than 0 ℃, the outdoor evaporation coil surface temperature is lower than the dew point temperature of the environment air, the outdoor evaporation coil surface temperature depends on the refrigerant evaporation temperature under the influence of the environment temperature, the dew point temperature of the air is influenced by the relative humidity, therefore, the air temperature and humidity become the main judgment basis for whether the surface of the outdoor heat exchanger of the heat pump system is frosted or not, and the indoor fan runs at an ultra-low speed: open interior fan when the defrosting, realize having great contribution to indoor travelling comfort to indoor heat supply when the defrosting, two-way valve one, two are opened: for controlling fan coil, electronic expansion valve opens: the control system has the advantages of energy conservation, high precision, high response speed and the like, can be used for controlling the air conditioning system in a comfortable and energy-saving manner, and can prevent the air supply temperature of the indoor heat exchanger from being lowered too much, thereby saving the energy consumption of operations such as air conditioning defrosting and the like, enhancing the comfort of users, realizing the effect of a safety protector, ensuring higher system performance and efficiency, wherein the detection defrosting is not completed, then the defrosting can be controlled by a detector, the indoor fan can be continuously driven to run at an ultra-low speed, the steps are continued, the progress of defrosting is detected, the defrosting step can be completed, and a normal heating mode is carried out.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The utility model provides an air source heat pump defrosting control system which characterized in that: the indoor heat exchanger comprises a compressor (1), an indoor heat exchanger (2), an outdoor heat exchanger (3), an outdoor dual sensor (4), an indoor fan (5), a two-way valve II (6), a two-way valve I (7), an electronic expansion valve (8), a filter (9) and a detector (10).
2. The air source heat pump defrost control system of claim 1, wherein: the outdoor heat exchanger (3) and the outdoor double sensor (4) are both arranged in an outdoor environment.
3. The air source heat pump defrost control system of claim 1, wherein: the two ends of the detector (10) are connected with the compressor (1) and the outdoor heat exchanger (3), the compressor (1) and the outdoor heat exchanger (3) are connected with each other independently, and the periphery of the detector (10) is further connected with the outdoor double sensor (4).
4. The air source heat pump defrost control system of claim 1, wherein: and detection sensors for the outdoor ambient temperature and the surface temperature of the evaporator coil are arranged in the outdoor double sensor (4).
5. A defrosting control method of an air source heat pump is characterized by comprising the following steps: comprises the following steps:
the air conditioner heats and operates: when the air conditioner heats, the plug-in unit can freeze and frost, so that the air conditioner stops blowing when being blocked, enters an automatic defrosting state, and the panel lamp can continuously flash.
6. The defrosting control method of an air source heat pump according to claim 5, characterized in that: the method comprises the following steps of judging air temperature and air humidity and needing defrosting:
starting an outdoor double sensor: the system comprises an outdoor environment temperature detection sensor and an outdoor evaporation coil surface temperature detection sensor:
detecting the outdoor environment temperature: detecting whether the outdoor environment temperature is lower than 0 ℃;
detecting the surface temperature of the outdoor evaporation coil: whether the surface temperature of the outdoor evaporation coil is lower than the dew point temperature of the ambient air or not is judged, the surface temperature of the outdoor evaporation coil depends on the evaporation temperature of the refrigerant under the influence of the ambient temperature, and the dew point temperature of the air is influenced by the relative humidity, so that the temperature and the humidity of the air become main judgment bases for judging whether the surface of the outdoor heat exchanger of the heat pump system is frosted or not.
7. The defrosting control method of an air source heat pump according to claim 5, characterized in that: if the air temperature and the air humidity need defrosting, continuing to judge whether the air temperature and the air humidity need defrosting, if the values are abnormal, entering the next step:
the method comprises the following steps: the indoor fan runs at an ultra-low speed: the inner fan is started during defrosting, so that heat is supplied to the indoor space while defrosting is realized, and great contribution is made to indoor comfort;
step two: opening a first two-way valve and a second two-way valve: used for controlling the fan coil;
step three: opening the electronic expansion valve: the indoor heat exchanger has the advantages of being energy-saving, high in precision, high in response speed and the like, can be used for controlling the air conditioning system in a comfortable and energy-saving mode, and enables the air supply temperature of the indoor heat exchanger not to be lowered too much, so that the energy consumption of operations such as air conditioning defrosting is saved, the comfort of a user is enhanced, the effect of a safety protector can be achieved, and the system performance and the efficiency are higher.
8. The defrosting control method of an air source heat pump according to claim 5, characterized in that: the method comprises the following steps of detecting the defrosting progress:
if the defrosting is not finished, the indoor fan continues to be driven to run at the ultra-low speed under the control of the detector, the steps are continued, the defrosting progress is finished, the defrosting step is finished, and a normal heating mode is carried out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN115789867A (en) * | 2022-12-06 | 2023-03-14 | 珠海格力电器股份有限公司 | Defrosting control method and device, air conditioner and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115789867A (en) * | 2022-12-06 | 2023-03-14 | 珠海格力电器股份有限公司 | Defrosting control method and device, air conditioner and storage medium |
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Application publication date: 20220225 |