CN113218117A - Method and system for reducing frosting of air energy heat pump - Google Patents
Method and system for reducing frosting of air energy heat pump Download PDFInfo
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- CN113218117A CN113218117A CN202110523067.3A CN202110523067A CN113218117A CN 113218117 A CN113218117 A CN 113218117A CN 202110523067 A CN202110523067 A CN 202110523067A CN 113218117 A CN113218117 A CN 113218117A
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- 238000000034 method Methods 0.000 title claims abstract description 39
- 239000003507 refrigerant Substances 0.000 claims abstract description 41
- 238000001704 evaporation Methods 0.000 claims abstract description 40
- 230000008020 evaporation Effects 0.000 claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 239000007788 liquid Substances 0.000 claims description 12
- 238000011144 upstream manufacturing Methods 0.000 claims description 6
- 238000007664 blowing Methods 0.000 claims description 3
- 238000010257 thawing Methods 0.000 abstract description 16
- 230000002829 reductive effect Effects 0.000 abstract description 15
- 238000010438 heat treatment Methods 0.000 abstract description 11
- 230000000694 effects Effects 0.000 abstract description 6
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- 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
- 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
- F25B47/006—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass for preventing frost
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Abstract
The invention discloses a method and a system for reducing frosting of an air energy heat pump, and belongs to the technical field of air energy heat pumps. The method for reducing the frosting of the air-source heat pump comprises the step S01 of obtaining the evaporation temperature T of the refrigerante(ii) a Step S02, when the evaporation temperature T is lowere＜T0When, T0Performing step S03 for a preset temperature; step S03, obtaining the dew point temperature T of the current wet airL(ii) a Step S04, when the evaporation temperature T is lowereDew point temperature T is less than or equal toLIf yes, go to step S05; step S05, increasing the rotating speed of the fan according to a first preset condition; when the rotating speed of the fan reaches the preset maximum rotating speed, and T isL‑TeWhen the temperature is more than or equal to 0 ℃, performing step S06; step S06, the frequency of the variable frequency compressor is reduced according to a second preset condition, the problems of frosting in winter and high defrosting frequency of the traditional air-source heat pump are solved, and therefore the heating capacity of the heat pump unit is improved, and more energy-saving operation is achievedAnd (5) performing effect.
Description
Technical Field
The invention relates to the technical field of air energy heat pumps, in particular to a method and a system for reducing frosting of an air energy heat pump.
Background
In the existing air energy heat pump technology, frosting in winter becomes a necessary phenomenon, frequent frosting and defrosting processes seriously affect the heating performance and the energy efficiency ratio of a heat pump unit, and no better method is available in the industry at present to change the current situation.
Therefore, a method and a system for reducing the frosting of the air-source heat pump are needed to solve the above technical problems in the prior art.
Disclosure of Invention
The invention aims to provide a method and a system for reducing frosting of an air energy heat pump, which solve the problems of frosting in winter and high defrosting frequency of the traditional air energy heat pump, thereby improving the heating capacity of a heat pump unit, having a more energy-saving operation effect, enabling the heat pump unit to operate more efficiently and prolonging the service life of the heat pump unit.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method of reducing air-energy heat pump frosting, comprising:
step S01, obtaining the evaporation temperature T of the refrigerante；
Step S02, when the evaporation temperature T is lowere＜T0When, T0Performing step S03 for a preset temperature;
step S03, obtaining the dew point temperature T of the current wet airL；
Step S04, when the evaporation temperature T is lowereDew point temperature T is less than or equal toLIf yes, go to step S05;
step S05, increasing according to a first preset conditionThe rotating speed of the fan; when T isL-TeWhen the temperature is lower than 0 ℃, keeping the current rotating speed of the fan; when the rotating speed of the fan reaches the preset maximum rotating speed, and T isL-TeWhen the temperature is more than or equal to 0 ℃, performing step S06;
step S06, reducing the frequency of the inverter compressor according to a second preset condition; when the temperature is less than or equal to minus 1 ℃ and T is less than or equal toL-TeWhen the temperature is lower than 0 ℃, the frequency of the current variable frequency compressor is kept; when T isL-TeAnd < "1 ℃, the rotating speed of the fan and the frequency of the variable frequency compressor are recovered to the state of the step S01.
As a preferable technical solution of the method for reducing the frosting of the air-source heat pump, in the step S02, when the evaporation temperature T is higher than the preset temperature T1≥T0In the process, the evaporator fins are not frosted, and the fan and the variable frequency compressor are not required to be adjusted.
As a preferable technical solution of the method for reducing the frosting of the air-source heat pump, in the step S04, when the evaporation temperature T is higher than the preset temperature TeDew point temperature TLIn the process, the evaporator fins are not frosted, and the fan and the variable frequency compressor are not required to be adjusted.
As a preferable technical scheme of the method for reducing the frosting of the air-source heat pump, the preset temperature T0≥-2℃。
As a preferable technical solution of the method for reducing the frosting of the air-source heat pump, in the step S06, the second preset condition is:
when the temperature is less than or equal to 0 ℃ and T is less than or equal toL-TeWhen the temperature is lower than 1 ℃, adjusting the frequency of the variable frequency compressor in a mode of reducing 1Hz according to every 4 preset periods;
when the temperature is less than or equal to 1 ℃ and T is less than or equal toL-TeWhen the temperature is less than 2 ℃, adjusting the frequency of the variable frequency compressor in a mode of reducing 1Hz according to every 3 preset periods;
when the temperature is less than or equal to 2 ℃ and T is less than or equal toL-TeWhen the temperature is less than 3 ℃, adjusting the frequency of the variable frequency compressor in a mode of reducing 1Hz according to every 2 preset periods;
when T isL-TeAnd when the temperature is more than or equal to 3 ℃, adjusting the frequency of the variable frequency compressor in a mode of reducing 1Hz according to each 1 preset period.
As a reductionIn the step S01, the evaporation temperature T of the refrigerant is calculated by using the ideal gas equation and the pressure of the refrigerant in the vapor state measured by the pressure sensore。
As a preferable technical solution of the method for reducing the air-source heat pump frosting, in the step S03, the dew point temperature T of the current humid air is calculated by using the physical parameters of the humid air and the temperature and humidity of the current environment measured by the temperature and humidity sensorL。
To achieve the above object, the present invention further provides a system for reducing frosting of an air-source heat pump, comprising:
an inverter compressor for compressing low-pressure refrigerant vapor into high-temperature high-pressure refrigerant vapor;
the four-way valve is connected with the variable frequency compressor;
the condenser is connected with the four-way valve, and the high-temperature and high-pressure refrigerant vapor flowing out of the variable-frequency compressor enters the condenser through the four-way valve and then is discharged as high-pressure refrigerant liquid;
a water tank connected to the condenser for exchanging heat with the high-temperature and high-pressure refrigerant vapor in the condenser;
the expansion valve is connected with the condenser, and the high-pressure refrigerant liquid discharged by the condenser is throttled by the expansion valve and then discharged into low-pressure low-temperature refrigerant liquid;
the evaporator is connected with the expansion valve and the four-way valve, the low-pressure and low-temperature refrigerant liquid discharged by the expansion valve is changed into low-pressure refrigerant vapor after absorbing heat and gasifying through the evaporator, and the low-pressure refrigerant vapor enters the variable-frequency compressor through the four-way valve;
a blower for blowing air into the evaporator;
the temperature and humidity sensor is arranged at the fan and used for detecting the temperature and the humidity of air blown into the evaporator by the fan;
the pressure sensor is arranged at the downstream of the evaporator and is positioned on a pipeline at the upstream of the variable-frequency compressor;
and the controller is electrically connected with the variable frequency compressor, the fan, the temperature and humidity sensor and the pressure sensor and is used for executing the method for reducing the frosting of the air energy heat pump.
As a preferred technical solution of a system for reducing frosting of an air-energy heat pump, the system for reducing frosting of an air-energy heat pump further includes:
the first temperature sensor is arranged in the water tank and used for measuring the temperature of water in the water tank;
the second temperature sensor is arranged on a pipeline for connecting the four-way valve and the variable-frequency compressor and is positioned at the upstream of the four-way valve;
and the third temperature sensor is arranged on a pipeline connecting the four-way valve and the variable-frequency compressor and is positioned at the downstream of the four-way valve.
As an optimal technical scheme of the system for reducing the frosting of the air-source heat pump, the variable-frequency compressor is a direct-current variable-frequency compressor, and the fan is a direct-current fan.
The invention provides a method and a system for reducing air-source heat pump frosting, wherein a controller in the system for reducing air-source heat pump frosting is used for executing the method for reducing air-source heat pump frosting, and the method for reducing air-source heat pump frosting comprises the step S01 of acquiring the evaporation temperature T of refrigerante(ii) a Step S02, when the evaporation temperature T is lowere＜T0When, T0If the temperature is the preset temperature, at this time, the evaporator fin in the air-source heat pump may be frosted, and the step S03 is performed; step S03, obtaining the dew point temperature T of the current wet airL(ii) a Step S04, when the evaporation temperature T is lowereDew point temperature T is less than or equal toLAt this time, the evaporator fin is slowly frosted, and for this purpose, the evaporation temperature T can be increasedeThe method (1) of (4) suppressing frosting, step S05 is performed; step S05, increasing the rotation speed of the fan according to a first preset condition to increase the evaporation temperature Te(ii) a When the rotating speed of the fan reaches the preset maximum rotating speed, and T isL-TeWhen the temperature is more than or equal to 0 ℃, performing step S06; step (ii) ofS06, reducing the frequency of the inverter compressor according to a second preset condition to increase the evaporation temperature Te. The evaporating temperature T can be increased by increasing the rotating speed of the fan and reducing the frequency of the variable frequency compressoreTo adjust the evaporation temperature TeAnd dew point temperature TLThe difference, and then reach the purpose that reduces or restrain the evaporimeter fin and frost, reduce the defrosting number of times to reduce heating capacity loss and electric quantity loss because reverse defrosting brings, thereby promote heat pump set's heating capacity and possess more energy-conserving operation effect, make heat pump set more efficient operation and promote heat pump set's life.
Drawings
FIG. 1 is a flow diagram of a method of reducing frost formation in an air-source heat pump according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a system for reducing frosting on an air-source heat pump according to an embodiment of the present invention.
Reference numerals:
1. a variable frequency compressor; 2. a four-way valve; 3. a condenser; 4. a water tank; 5. an expansion valve; 6. an evaporator; 7. a fan; 8. a temperature and humidity sensor; 9. a pressure sensor; 10. a controller; 11. a first temperature sensor; 12. a second temperature sensor; 13. a third temperature sensor.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used based on the orientations and positional relationships shown in the drawings only for convenience of description and simplification of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be configured 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 only for descriptive purposes and are not intended to have a special meaning.
Note that, when the dew point temperature of the humid air is lower than 0 ℃, and the evaporation temperature is lower than the dew point temperature of the humid air, moisture in the humid air is precipitated and adheres to the evaporator fins.
As shown in fig. 1 and 2, the present embodiment provides a method for reducing frost formation of an air-energy heat pump, including:
step S01, obtaining the evaporation temperature T of the refrigerante；
Preferably, in the present embodiment, the evaporation temperature T of the refrigerant is calculated using the ideal gas equation and the pressure of the refrigerant in the vapor state measured by the pressure sensor 9e。
Step S02, when the evaporation temperature T is lowere＜T0When, T0To a preset temperature, at which time the air-source heat pumpThe fins of the evaporator 6 in (1) may be frosted, and the step S03 is performed; when evaporation temperature T1≥T0In the process, the fins of the evaporator 6 are not frosted, and the fan 7 and the variable frequency compressor 1 are not required to be adjusted;
preferably, the preset temperature T0Not less than-2 ℃. Further preferably, in the present embodiment, the temperature T is preset0＝-2℃。
Step S03, obtaining the dew point temperature T of the current wet airL；
Preferably, in this embodiment, the dew point temperature T of the current humid air is calculated by using the physical property parameters of the humid air and the temperature and humidity of the current environment measured by the temperature and humidity sensor 8L。
Step S04, when the evaporation temperature T is lowereDew point temperature T is less than or equal toLAt this time, the evaporator 6 fins are slowly frosted, and for this purpose, the evaporation temperature T can be increasedeThe method (1) of (4) suppressing frosting, step S05 is performed; when evaporation temperature TeDew point temperature TLIn the process, the fins of the evaporator 6 are not frosted, and the fan 7 and the variable frequency compressor 1 are not required to be adjusted;
step S05, increasing the rotation speed of the fan 7 according to a first preset condition, where the heat exchange amount is the heat exchange area × the heat exchange coefficient × the temperature difference, and the heat exchange amount is determined by the frequency of the inverter compressor 1, and the heat exchange amount is not changed when the frequency of the inverter compressor 1 is not changed; when the rotating speed of the fan 7 is increased, the wind speed is increased, and the heat exchange coefficient is increased; to ensure constant heat transfer, the temperature difference is reduced and the dew point temperature T is increasedLUnchanged, the evaporation temperature TeIncrease, so that the evaporation temperature T can be increased by increasing the wind speedeThereby reducing the frost formation of the fins of the evaporator 6; when T isL-TeWhen the temperature is lower than 0 ℃, keeping the current rotating speed of the fan 7; when the rotating speed of the fan 7 reaches the preset maximum rotating speed and T is reachedL-TeWhen the temperature is more than or equal to 0 ℃, performing step S06;
the first preset condition refers to that the rotating speed of the fan 7 is quantitatively increased according to a certain period, and the period and the speed increasing amount can be set according to experience.
Step S06, reducing the frequency conversion according to a second preset conditionThe frequency of the compressor 1, likewise, since the heat transfer capacity is equal to the heat transfer area × the heat transfer coefficient × the temperature difference, when the frequency of the inverter compressor 1 is reduced, the heat transfer capacity is reduced, and the heat transfer area and the heat transfer coefficient are unchanged, then the temperature difference is reduced, and the dew point temperature T is reducedLUnchanged, the evaporation temperature TeIncreasing; after the variable frequency compressor 1 operates in a frequency reduction mode, the compression ratios of the high-pressure side and the low-pressure side of the heat pump unit can be reduced, so that the energy efficiency ratio of the system is improved; when the temperature is less than or equal to minus 1 ℃ and T is less than or equal toL-TeWhen the temperature is lower than 0 ℃, the frequency of the current variable frequency compressor 1 is kept; when T isL-TeAnd < "1 ℃, the rotating speed of the fan 7 and the frequency of the inverter compressor 1 are restored to the state at the step S01. The self-adaptive frequency adjustment enables the heat pump unit to always operate at the optimal frequency under the condition of keeping not frosting, the comprehensive heating quantity of the whole day is higher than the heating quantity under the condition of frosting and defrosting, the power consumption is greatly reduced, and the dual gain effect is formed.
The evaporation temperature T can be increased by increasing the rotating speed of the fan 7 and reducing the frequency of the inverter compressor 1eTo adjust the evaporation temperature TeAnd dew point temperature TLLet the evaporation temperature T beeSlightly above dew point temperature TLTherefore, the frosting condition cannot be achieved, the aim of reducing or inhibiting frosting of fins of the evaporator 6 is fulfilled, the heat pump unit is operated in a frostless mode, the defrosting times are reduced, heating loss and electric quantity loss caused by reverse defrosting are reduced, the heating capacity of the heat pump unit is improved, the energy-saving operation effect is achieved, and the heat pump unit is operated more efficiently; and because the life-span of motor and system piping is relevant with the number of times of opening and shutting down of heat pump set, when the defrosting causes frequently to start and stop the heat pump set, to the influence of heat pump set life-span far more than the life-span when normal work, this embodiment can effectively improve heat pump set's life.
Preferably, in this embodiment, the second preset condition is:
when the temperature is less than or equal to 0 ℃ and T is less than or equal toL-TeWhen the temperature is lower than 1 ℃, adjusting the frequency of the variable frequency compressor 1 in a mode of reducing 1Hz according to every 4 preset periods;
when the temperature is less than or equal to 1 ℃ and T is less than or equal toL-TeWhen the temperature is lower than 2 ℃, adjusting the frequency of the variable frequency compressor 1 in a mode of reducing 1Hz according to every 3 preset periods;
when the temperature is less than or equal to 2 ℃ and T is less than or equal toL-TeWhen the temperature is less than 3 ℃, adjusting the frequency of the variable frequency compressor 1 in a manner of reducing 1Hz according to every 2 preset periods;
when T isL-TeAnd when the temperature is more than or equal to 3 ℃, adjusting the frequency of the variable frequency compressor 1 in a mode of reducing 1Hz according to each 1 preset period.
Step S07, when the frequency of the inverter compressor 1 is reduced to the preset minimum frequency, at this time, the inverter compressor 1 keeps the frequency running, if the fins of the evaporator 6 still frost slowly in the running state of the frequency, when the defrosting condition is reached, the normal automatic defrosting is performed. It should be noted that the defrosting condition refers to a condition that a conventional air-source heat pump needs defrosting. When the air energy heat pump is in the northern haze meteorological condition, when the air humidity is predicted to reach 90% of the service environment, the heat pump unit runs at the lowest frequency, when the normal defrosting condition is reached, automatic defrosting is realized, when the frequency is reduced to the minimum, the heating capacity of the heat pump unit is greatly reduced, when the heat exchange surface area is unchanged, the evaporation temperature T is constanteAnd the refrigerating capacity is reduced, and the frosting amount of fins of the evaporator 6 is also greatly reduced in the same time, so that the running time of the heat pump unit is prolonged, and the defrosting times are reduced.
As shown in fig. 2, the embodiment further provides a system for reducing air-source heat pump frosting, which includes an inverter compressor 1, a four-way valve 2, a condenser 3, a water tank 4, an expansion valve 5, an evaporator 6, a fan 7, a temperature and humidity sensor 8, a pressure sensor 9 and a controller 10, wherein the inverter compressor 1 is used for compressing low-pressure refrigerant vapor into high-temperature high-pressure refrigerant vapor, and the inverter compressor 1 can regulate and output the heating capacity of the system, so as to regulate the evaporation temperature and the condensation temperature; the four-way valve 2 is connected with the variable frequency compressor 1; the condenser 3 is connected with the four-way valve 2, and high-temperature and high-pressure refrigerant vapor flowing out of the variable-frequency compressor 1 enters the condenser 3 through the four-way valve 2 and then is discharged as high-pressure refrigerant liquid; the water tank 4 is connected with the condenser 3 and is used for exchanging heat with high-temperature and high-pressure refrigerant vapor in the condenser 3; the expansion valve 5 is connected with the condenser 3, and the high-pressure refrigerant liquid discharged from the condenser 3 is throttled by the expansion valve 5 and then discharged into low-pressure and low-temperature refrigerant liquid; the evaporator 6 is connected with the expansion valve 5 and the four-way valve 2, the low-pressure low-temperature refrigerant liquid discharged by the expansion valve 5 is changed into low-pressure refrigerant vapor after absorbing heat and gasifying through the evaporator 6, and the low-pressure refrigerant vapor enters the variable frequency compressor 1 through the four-way valve 2; the fan 7 is used for blowing air into the evaporator 6; the temperature and humidity sensor 8 is arranged at the fan 7 and used for detecting the temperature and the humidity of air blown into the evaporator 6 by the fan 7 in real time; the pressure sensor 9 is arranged on the pipeline at the downstream of the evaporator 6 and at the upstream of the variable frequency compressor 1; the controller 10 is electrically connected with the inverter compressor 1, the fan 7, the temperature and humidity sensor 8 and the pressure sensor 9, and is used for executing the method for reducing the frosting of the air-source heat pump. The controller 10 calculates the dew point temperature of the current humid air from the detected value of the temperature/humidity sensor 8 by using the physical property parameter of the built-in humid air.
Preferably, in the present embodiment, the pressure sensor 9 is a low pressure sensor. The actual evaporation temperature T of the system can be accurately calculated through signal feedback of the low-pressure sensoreAnd the influence of the deviation of the conventional temperature sensor caused by the difference of the arrangement position and the process difference is avoided.
Preferably, the system for reducing the air-source heat pump frosting further comprises a first temperature sensor 11, a second temperature sensor 12 and a third temperature sensor 13, wherein the first temperature sensor 11 is arranged in the water tank 4 and is used for measuring the temperature of the water in the water tank 4; the second temperature sensor 12 is arranged on a pipeline connecting the four-way valve 2 and the variable frequency compressor 1 and is positioned at the upstream of the four-way valve 2, and the second temperature sensor 12 is used for measuring the exhaust temperature of the variable frequency compressor 1; the third temperature sensor 13 is disposed on a pipeline connecting the four-way valve 2 and the inverter compressor 1, and is located at a downstream of the four-way valve 2, and the third temperature sensor 13 is configured to measure a return air temperature of the inverter compressor 1.
Preferably, in the present embodiment, the inverter compressor 1 is a dc inverter compressor, and the fan 7 is a dc fan.
Preferably, in the present embodiment, the water tank 4 is a heat-insulating water tank. The condenser 3 is a plate heat exchanger. The evaporator 6 is a fin evaporator. The expansion valve 5 is an electronic expansion valve.
The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.
Claims (10)
1. A method of reducing air-source heat pump frosting, comprising:
step S01, obtaining the evaporation temperature T of the refrigerante；
Step S02, when the evaporation temperature T is lowere＜T0When, T0Performing step S03 for a preset temperature;
step S03, obtaining the dew point temperature T of the current wet airL；
Step S04, when the evaporation temperature T is lowereDew point temperature T is less than or equal toLIf yes, go to step S05;
step S05, increasing the rotating speed of the fan (7) according to a first preset condition; when T isL-TeWhen the temperature is less than 0 ℃, keeping the current rotating speed of the fan (7); when the rotating speed of the fan (7) reaches the preset maximum rotating speed and T is reachedL-TeWhen the temperature is more than or equal to 0 ℃, performing step S06;
step S06, reducing the frequency of the inverter compressor (1) according to a second preset condition; when the temperature is less than or equal to minus 1 ℃ and T is less than or equal toL-TeWhen the temperature is less than 0 ℃, the frequency of the current variable frequency compressor (1) is kept; when T isL-TeAnd when the temperature is < -1 ℃, the rotating speed of the fan (7) and the frequency of the variable frequency compressor (1) are recovered to the state of the step S01.
2. The method for reducing air-source heat pump frosting of claim 1, wherein in said step S02, when the evaporation temperature T is T1≥T0In the process, the fins of the evaporator (6) cannot frost, and the fan (7) and the variable-frequency compressor (1) do not need to be adjusted.
3. The method for reducing air-source heat pump frosting of claim 1, wherein in said step S04, when the evaporation temperature T is TeDew point temperature TLIn the process, the fins of the evaporator (6) cannot frost, and the fan (7) and the variable-frequency compressor (1) do not need to be adjusted.
4. The method of reducing air-energy heat pump frosting of claim 1, wherein said preset temperature T0≥-2℃。
5. The method for reducing air-source heat pump frosting of claim 1, wherein in said step S06, said second preset condition is:
when the temperature is less than or equal to 0 ℃ and T is less than or equal toL-TeWhen the temperature is lower than 1 ℃, adjusting the frequency of the variable frequency compressor (1) in a manner of reducing 1Hz according to every 4 preset periods;
when the temperature is less than or equal to 1 ℃ and T is less than or equal toL-TeWhen the temperature is less than 2 ℃, adjusting the frequency of the variable frequency compressor (1) in a manner of reducing 1Hz according to every 3 preset periods;
when the temperature is less than or equal to 2 ℃ and T is less than or equal toL-TeWhen the temperature is less than 3 ℃, adjusting the frequency of the variable frequency compressor (1) in a manner of reducing 1Hz according to every 2 preset periods;
when T isL-TeAnd when the temperature is more than or equal to 3 ℃, adjusting the frequency of the variable frequency compressor (1) in a mode of reducing 1Hz according to each 1 preset period.
6. The method for reducing air-energy heat pump frosting according to claim 1, wherein in said step S01, the refrigerant evaporating temperature T is calculated using the ideal gas equation and the pressure of the refrigerant in the vapor state measured by the pressure sensor (9)e。
7. The method for reducing the frosting of the air-source heat pump according to claim 1, wherein in the step S03, the dew point temperature T of the current wet air is calculated by using the physical parameters of the wet air and the temperature and humidity of the current environment measured by the temperature and humidity sensor (8)L。
8. A system for reducing air-source heat pump frosting, comprising:
an inverter compressor (1) for compressing low-pressure refrigerant vapor into high-temperature high-pressure refrigerant vapor;
the four-way valve (2) is connected with the variable-frequency compressor (1);
the condenser (3) is connected with the four-way valve (2), and the high-temperature and high-pressure refrigerant vapor flowing out of the variable-frequency compressor (1) enters the condenser (3) through the four-way valve (2) and then is discharged as high-pressure refrigerant liquid;
a water tank (4) connected to the condenser (3) for exchanging heat with the high-temperature and high-pressure refrigerant vapor in the condenser (3);
the expansion valve (5) is connected with the condenser (3), and the high-pressure refrigerant liquid discharged by the condenser (3) is throttled by the expansion valve (5) and then discharged into low-pressure and low-temperature refrigerant liquid;
the evaporator (6) is connected with the expansion valve (5) and the four-way valve (2), the low-pressure and low-temperature refrigerant liquid discharged by the expansion valve (5) is changed into low-pressure refrigerant vapor after absorbing heat and gasifying through the evaporator (6), and the low-pressure refrigerant vapor enters the inverter compressor (1) through the four-way valve (2);
a fan (7) for blowing air into the evaporator (6);
the temperature and humidity sensor (8) is arranged at the fan (7) and used for detecting the temperature and the humidity of air blown into the evaporator (6) by the fan (7);
a pressure sensor (9) arranged on the pipeline at the downstream of the evaporator (6) and at the upstream of the variable frequency compressor (1);
the controller (10) is electrically connected with the inverter compressor (1), the fan (7), the temperature and humidity sensor (8) and the pressure sensor (9) and is used for executing the method for reducing the frosting of the air-source heat pump according to any one of claims 1 to 7.
9. The system for reducing air-energy heat pump frosting of claim 8, wherein said system for reducing air-energy heat pump frosting further comprises:
a first temperature sensor (11) arranged in the water tank (4) for measuring the temperature of the water in the water tank (4);
the second temperature sensor (12) is arranged on a pipeline for connecting the four-way valve (2) and the variable-frequency compressor (1) and is positioned at the upstream of the four-way valve (2);
and the third temperature sensor (13) is arranged on a pipeline for connecting the four-way valve (2) and the variable-frequency compressor (1) and is positioned at the downstream of the four-way valve (2).
10. The system for reducing air-source heat pump frosting according to claim 8, wherein said inverter compressor (1) is a dc inverter compressor and said fan (7) is a dc fan.
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