CN112212465B - Anti-frosting control method and device for air conditioning unit and air conditioning system - Google Patents
Anti-frosting control method and device for air conditioning unit and air conditioning system Download PDFInfo
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- CN112212465B CN112212465B CN202011148640.9A CN202011148640A CN112212465B CN 112212465 B CN112212465 B CN 112212465B CN 202011148640 A CN202011148640 A CN 202011148640A CN 112212465 B CN112212465 B CN 112212465B
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 164
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000007791 dehumidification Methods 0.000 claims abstract description 136
- 238000001704 evaporation Methods 0.000 claims abstract description 66
- 230000008020 evaporation Effects 0.000 claims abstract description 54
- 239000003507 refrigerant Substances 0.000 claims abstract description 33
- 230000002829 reductive effect Effects 0.000 claims description 23
- 239000007788 liquid Substances 0.000 claims description 22
- 230000002265 prevention Effects 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 14
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 238000005057 refrigeration Methods 0.000 abstract description 27
- 230000000694 effects Effects 0.000 abstract description 13
- 230000002411 adverse Effects 0.000 abstract description 5
- 238000010257 thawing Methods 0.000 description 13
- 238000010586 diagram Methods 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 230000006870 function Effects 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 230000005494 condensation Effects 0.000 description 3
- 238000009833 condensation Methods 0.000 description 3
- 230000002745 absorbent Effects 0.000 description 2
- 239000002250 absorbent Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000009931 harmful effect Effects 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000010792 warming Methods 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000001502 supplementing effect Effects 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
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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
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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Abstract
The application relates to an air conditioning unit anti-frosting control method, an air conditioning unit anti-frosting control device and an air conditioning system, wherein the method comprises the following steps: acquiring evaporation temperature acquired by an evaporator of an air conditioning unit; when the evaporation temperature is lower than the preset anti-frosting temperature threshold value, the control dehumidification module utilizes the refrigerant output by the condenser of the air conditioning unit to reduce the relative humidity of the air flow passing through the evaporator of the air conditioning unit to inhibit frosting, the frosting problem of the evaporator can be effectively inhibited without stopping refrigeration of the air conditioning unit, the refrigeration of the air conditioning unit is ensured to be uninterrupted, adverse effects caused by stopping refrigeration of the air conditioning unit are avoided, and the reliability of anti-frosting operation is improved.
Description
Technical Field
The application relates to the technical field of electrical equipment control, in particular to an air conditioning unit anti-frosting control method and device and an air conditioning system.
Background
With the development of science and technology and the continuous progress of society, air conditioners become indispensable electrical equipment in daily work and life of people. The air supply of the air conditioner generally has the frosting problem, once an air conditioner evaporator is frosted, the heat exchange can not be directly carried out, and a unit must adopt corresponding defrosting measures.
The traditional air conditioner defrosting mode comprises hot gas bypass defrosting and four-way valve reversing defrosting, but in any defrosting mode, the temperature of an evaporator which is frosted is increased, a refrigerating function cannot be provided during defrosting, and the use of a user is influenced. For some air conditioning units used in special scenes, once the refrigeration stops running, the field work is adversely affected. The traditional air conditioner defrosting mode has the defect of low operation reliability.
Disclosure of Invention
Therefore, it is necessary to provide an air conditioning unit anti-frosting control method, device and air conditioning system to solve the problems of low operation reliability caused by the need of stopping cooling during defrosting in the conventional air conditioning defrosting mode, and achieve the technical effect of effectively improving operation reliability.
An air conditioning unit anti-frosting control method comprises the following steps:
acquiring evaporation temperature acquired by an evaporator of an air conditioning unit;
when the evaporation temperature is lower than a preset anti-frosting temperature threshold value, controlling the dehumidification module to reduce the relative humidity of the airflow passing through an evaporator of the air conditioning unit by using a refrigerant output by a condenser of the air conditioning unit; the dehumidification module is arranged at an air inlet of the evaporator.
In one embodiment, after acquiring the evaporation temperature collected by the evaporator of the air conditioning unit, the method further includes:
and when the evaporation temperature is greater than or equal to a preset anti-frosting temperature threshold value, controlling the air conditioning unit to maintain a preset running state.
In one embodiment, a first end of a three-way valve of an air conditioning unit is connected with the dehumidification module, a second end of the three-way valve is connected with the evaporator and a first control valve of the air conditioning unit, the first control valve is connected with a condenser of the air conditioning unit, a third end of the three-way valve is connected with the condenser, the first end and the second end of the three-way valve are conducted when the three-way valve is in a power-off state, and the first end and the third end of the three-way valve are conducted when the three-way valve is in a power-on state; the dehumidification module comprises a second control valve, a dehumidification heat exchanger and a temperature rise heat exchanger, the temperature rise heat exchanger is positioned between the evaporator and the dehumidification heat exchanger, the temperature rise heat exchanger is connected with the first end of the three-way valve and the second control valve, and the dehumidification heat exchanger is connected with the second control valve and a gas-liquid separator of an air conditioning unit;
the control dehumidification module utilizes the refrigerant of air conditioning unit's condenser output to reduce the air current relative humidity through air conditioning unit's evaporimeter, includes:
and controlling the three-way valve to be electrified, and controlling the opening degree of the second control valve to be reduced to a preset initial opening degree so as to adjust the evaporation temperature of the dehumidification heat exchanger to be below a dew point.
In one embodiment, after controlling the three-way valve to be energized and controlling the opening degree of the second control valve to be decreased to a preset initial opening degree, the method further includes:
and detecting the air outlet relative humidity of the dehumidification module, and adjusting the opening degree of the second control valve according to the air outlet relative humidity and a preset humidity range.
In one embodiment, the controlling the air conditioning unit to maintain the preset operation state includes:
controlling the three-way valve to keep a power-off state and controlling the second control valve to be opened to a set opening value; wherein the set opening value is greater than the initial opening.
In one embodiment, after the controlling and dehumidifying module reduces the relative humidity of the airflow passing through the evaporator of the air conditioning unit by using the refrigerant output by the condenser of the air conditioning unit, the controlling and dehumidifying module further includes:
and when detecting that the evaporation temperature of the evaporator is greater than a set exit frost-proof operation temperature threshold value, controlling the air conditioning unit to maintain a preset operation state.
An air conditioning unit anti-frosting control device comprising:
the temperature acquisition module is used for acquiring evaporation temperature acquired by an evaporator of the air conditioning unit;
the anti-frosting control module is used for controlling the dehumidification module to reduce the relative humidity of the airflow passing through the evaporator of the air conditioning unit by using a refrigerant output by the condenser of the air conditioning unit when the evaporation temperature is less than a preset anti-frosting temperature threshold value; the dehumidification module is arranged at an air inlet of the evaporator.
An air conditioning system comprising an air conditioning unit, a temperature sensor, a humidity sensor, and a controller, the air conditioning unit comprising: the system comprises a compressor, a gas-liquid separator, a condenser, a first control valve, a three-way valve, an evaporator and a dehumidification module; the compressor is connected with the gas-liquid separator and the condenser, the gas-liquid separator is connected with the evaporator and the dehumidification module, a first end of the three-way valve is connected with the dehumidification module, a second end of the three-way valve is connected with the evaporator and the first control valve, the first control valve is connected with the condenser, a third end of the three-way valve is connected with the condenser, the first end and the second end of the three-way valve are communicated when the three-way valve is in a power-off state, and the first end and the third end of the three-way valve are communicated when the three-way valve is in a power-on state;
the dehumidification module is arranged at an air inlet of the evaporator; the temperature sensor is arranged on the evaporator, the humidity sensor is arranged on the dehumidification module, the controller is connected with the temperature sensor, the humidity sensor, the three-way valve, the first control valve and the dehumidification module, and the controller is used for performing anti-frosting control according to the method.
In one embodiment, the dehumidification module comprises a second control valve, a dehumidification heat exchanger and a temperature-rise heat exchanger, the temperature-rise heat exchanger is located between the evaporator and the dehumidification heat exchanger, the temperature-rise heat exchanger is connected with the first end of the three-way valve and the second control valve, the dehumidification heat exchanger is connected with the second control valve and the gas-liquid separator, and the controller is connected with the second control valve.
In one embodiment, the air conditioning unit further comprises a condensing fan and an evaporating fan, wherein the condensing fan is arranged on the condenser, and the evaporating fan is arranged on the evaporator.
According to the air conditioning unit frosting prevention control method, the air conditioning unit frosting prevention control device and the air conditioning system, when the evaporation temperature of the evaporator of the air conditioning unit is smaller than the preset frosting prevention temperature threshold value, the dehumidification module arranged at the air inlet of the evaporator is controlled to reduce the relative humidity of air flow passing through the evaporator by using the refrigerant output by the condenser to inhibit frosting, the frosting problem of the evaporator can be effectively inhibited without stopping refrigeration of the air conditioning unit, the refrigeration of the air conditioning unit is ensured to be uninterrupted, adverse effects caused by the fact that the air conditioning unit stops refrigeration are avoided, and the reliability of frosting prevention operation is improved.
Drawings
FIG. 1 is a flow chart of an embodiment of a control method for preventing frosting of an air conditioning unit;
FIG. 2 is a flow chart of a frosting prevention control method for an air conditioning unit in another embodiment;
FIG. 3 is a block diagram of an embodiment of an anti-frosting control device of an air conditioning unit;
FIG. 4 is a schematic diagram of an embodiment of an air conditioning system;
FIG. 5 is a schematic flow diagram of a three-way valve in a normal operating state according to an embodiment;
FIG. 6 is a schematic flow diagram of a three-way valve in an anti-frosting operating condition according to an embodiment;
FIG. 7 is a schematic view illustrating an anti-frosting control principle of the air conditioning system according to an embodiment;
FIG. 8 is a schematic diagram illustrating a second electronic expansion valve adjustment in an anti-frosting operating condition, according to one embodiment;
description of reference numerals: the system comprises a compressor 1, a gas-liquid separator 2, a condensing fan 3, a condenser 4, a first electronic expansion valve 5, a three-way valve 6, an evaporating fan 7, an evaporator 8, a dehumidification module 9, a second electronic expansion valve 91, a dehumidification heat exchanger 92 and a heating heat exchanger 93.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
As described in the background art, in the air conditioning defrosting mode in the prior art, no matter hot gas bypass defrosting or four-way valve reversing defrosting is adopted, a refrigeration function cannot be provided during defrosting, the use of a user is affected, and particularly for special air conditioning units such as an airplane ground air conditioner, once refrigeration stops running, adverse effects on field work can be caused. Therefore, it is the fundamental solution to suppress the frost formation from the source.
The method for inhibiting frosting mainly comprises two methods of raising the temperature of the airflow and lowering the relative humidity of the airflow, and both methods can lower the relative humidity passing through the surface of the evaporator, thereby achieving the effect of inhibiting frosting. However, when the temperature of the air flow is raised, the operation load of the compressor is increased while the energy consumption is too large by adopting an electric heating mode, and the energy efficiency of the whole machine is seriously reduced; the method for reducing the relative humidity of the airflow is to carry out physical adsorption dehumidification by using a moisture absorbent or a water absorption filler and the like, and has two defects, namely, the moisture absorption capacity of a moisture absorption substance is limited, and the effect is gradually reduced even if the moisture absorption substance can be repeatedly used; secondly, the common moisture absorbent can generate certain corrosivity after being mixed with water, and the service life of the equipment can be seriously influenced.
There are two requirements for frost formation: the air relative humidity reaches 100% and the air contact surface temperature is below 0 ℃. When the air conditioning unit operates, the evaporation temperature is usually higher than 0 ℃, and frosting cannot occur, but under some special conditions, for meeting the capacity requirement, the evaporation temperature can be reduced to be lower than 0 ℃ to easily frost when the environment temperature of an evaporator is lower. When the unit can't avoid evaporating temperature to reduce, can restrain frosting through reducing the relative humidity who comes the air, when relative humidity reduces, the water content in the air reduces, after the low temperature evaporimeter cooling, relative humidity can't reach 100% just can't frosting.
Based on the reasons, the invention provides an anti-frosting air-conditioning system and a control scheme, wherein a dehumidification module is added in an air-conditioning refrigeration system, and the continuous dehumidification can be realized by combining a related control method, so that the relative humidity of air flow passing through an evaporator is reduced, the frosting is inhibited, and the uninterrupted refrigeration operation of an air conditioner is ensured.
In one embodiment, as shown in fig. 1, there is provided an air conditioning unit anti-frosting control method including:
step S100: and acquiring the evaporation temperature acquired by an evaporator of the air conditioning unit.
Specifically, a temperature sensor can be installed on an evaporator of the air conditioning unit, and the controller is connected with the temperature sensor to receive evaporation temperature data acquired by the temperature sensor. The temperature sensor can be used for acquiring the evaporation temperature of the evaporator in real time and uploading the temperature to the controller in the normal refrigeration process of the air conditioning unit. The controller can be a collection unit controller or a separate controller.
Step S200: when the evaporation temperature is lower than the preset anti-frosting temperature threshold value, the control dehumidification module reduces the relative humidity of the airflow passing through the evaporator of the air conditioning unit by using the refrigerant output by the condenser of the air conditioning unit.
Wherein, dehumidification module sets up in the air intake of evaporimeter. The specific value of the anti-frosting temperature threshold is not exclusive, and specifically, the anti-frosting temperature threshold may be set to 0 ℃. The controller compares the evaporation temperature who gathers with the anti-frosting temperature threshold value of preserving in advance, when detecting that evaporation temperature is less than predetermined anti-frosting temperature threshold value, control air conditioning unit gets into the anti-frosting running state, adjust through the pipeline valve to air conditioning unit and dehumidification module's internal valve, the high temperature refrigerant of the condenser output of messenger air conditioning unit passes through dehumidification module, dehumidification module utilizes the high temperature refrigerant to reduce the air moisture content, the air is supplied air through the evaporimeter cooling at last, thereby make the air current relative humidity through the evaporimeter reduce, can realize the effect of not frosting, can not increase the operating load of air conditioning unit compressor, and can realize continuously dehumidifying.
According to the air conditioning unit frosting prevention control method, when the evaporation temperature of the evaporator of the air conditioning unit is smaller than the preset frosting prevention temperature threshold value, the dehumidification module arranged at the air inlet of the evaporator is controlled to reduce the relative humidity of the air flow passing through the evaporator by using the refrigerant output by the condenser to inhibit frosting, the frosting problem of the evaporator can be effectively inhibited without stopping refrigeration of the air conditioning unit, the air conditioning unit is ensured to be uninterruptedly refrigerated, adverse effects caused by stopping refrigeration of the air conditioning unit are avoided, and the reliability of frosting prevention operation is improved.
In one embodiment, as shown in fig. 2, after step S100, the method further comprises step S300.
Step S300: and when the evaporation temperature is greater than or equal to a preset anti-frosting temperature threshold value, controlling the air conditioning unit to maintain a preset running state.
The preset operation state can be understood as the operation state that the air conditioning unit normally performs refrigeration. The controller compares the detected evaporation temperature with a preset anti-frosting temperature threshold value in real time, if the evaporation temperature is greater than or equal to the anti-frosting temperature threshold value, the anti-frosting operation is not needed, the air conditioning unit continues to execute normal refrigeration operation, and at the moment, the step S100 can be returned to continue to detect the evaporation temperature of the evaporator.
It can be understood that, according to different specific structures of the air conditioning unit and the dehumidification module, the specific manner of controlling the air conditioning unit to execute the preset operation state or enter the anti-frosting operation state may be correspondingly different. In one embodiment, a first end of a three-way valve of the air conditioning unit is connected with the dehumidification module, a second end of the three-way valve is connected with the evaporator and a first control valve of the air conditioning unit, the first control valve is connected with a condenser of the air conditioning unit, a third end of the three-way valve is connected with the condenser, the first end and the second end of the three-way valve are conducted when the three-way valve is in a power-off state, and the first end and the third end of the three-way valve are conducted when the three-way valve is in a power-on state; the dehumidification module comprises a second control valve, a dehumidification heat exchanger and a temperature rise heat exchanger, the temperature rise heat exchanger is located between the evaporator and the dehumidification heat exchanger, the temperature rise heat exchanger is connected with the first end of the three-way valve and the second control valve, and the dehumidification heat exchanger is connected with the second control valve and a gas-liquid separator of the air conditioning unit. The first control valve and the second control valve are respectively a first electronic expansion valve and a second electronic expansion valve.
Correspondingly, in step S300, controlling the air conditioning unit to maintain the preset operation state includes: and controlling the three-way valve to keep a power-off state and controlling the second control valve to be opened to a set opening value.
The specific value of the set opening degree value is not unique and can be adjusted according to the actual situation. When the air conditioning unit normally operates, the evaporation temperature of the evaporator is high, and frosting cannot be generated. It can be understood that, if the evaporating temperature of the evaporator is collected during the normal refrigeration process of the air conditioning unit, the air conditioning unit is already running according to the preset running state, that is, the three-way valve is in the power-off state, and the second electronic expansion valve is opened to the set opening value. When the evaporation temperature is greater than or equal to the preset anti-frosting temperature threshold value, the controller only needs to enable the three-way valve to be in a power-off state, and the opening degree of the second electronic expansion valve is continuously maintained at the set opening degree value. And a part of high-temperature refrigerant output by the condenser flows into the heating heat exchanger in the dehumidification module through the three-way valve after being throttled by the first electronic expansion valve, passes through the second electronic expansion valve and continuously flows through the dehumidification heat exchanger, is mixed with the other path of refrigerant output by the evaporator, and enters the gas-liquid separator. The dehumidification module is used for supplementing the evaporator, the refrigerant flow entering the dehumidification module is controlled by adjusting the opening degree of the second electronic expansion valve, the heating heat exchanger and the dehumidification heat exchanger can serve as the evaporator, and when the air conditioning unit is in a normal refrigeration running state, the refrigeration effect of the air conditioning unit can be improved.
Further, in one embodiment, in step S200, the controlling the dehumidification module to reduce the relative humidity of the airflow passing through the evaporator of the air conditioning unit by using the refrigerant output by the condenser of the air conditioning unit includes: and controlling the three-way valve to be electrified, and controlling the opening degree of the second control valve to be reduced to a preset initial opening degree so as to adjust the evaporation temperature of the dehumidification heat exchanger to be below the dew point.
Wherein the set opening value is greater than the initial opening. The initial opening degree of the second electronic expansion valve refers to the initial opening degree in the anti-frosting mode, the set value is smaller than the set opening degree value in the normal mode, after the anti-frosting mode is entered, the evaporation temperature of the dehumidification heat exchanger needs to be reduced for condensation and dehumidification, therefore, the throttling effect needs to be enhanced, the opening degree of the second electronic expansion valve is reduced, and the second electronic expansion valve is adjusted according to the air outlet relative humidity of the dehumidification module subsequently.
Specifically, when the anti-frosting operation state needs to be entered, the controller controls the three-way valve to be electrified and controls the opening degree of the second electronic expansion valve to be reduced to a preset initial opening degree, and a part of high-temperature refrigerant output by the condenser enters the heating heat exchanger through the three-way valve and then enters the dehumidifying heat exchanger after being throttled by the second electronic expansion valve. The refrigerant in the dehumidification heat exchanger is provided by throttling the refrigerant in the temperature-rising heat exchanger, so that the heat exchange amount of the temperature-rising heat exchanger is enough to heat the air. The evaporation temperature in the dehumidification heat exchanger is adjusted to be below the dew point through the second electronic expansion valve, water vapor is condensed after the air passes through the dehumidification heat exchanger and is separated out and removed in the form of condensed water, and then the temperature of the air after passing through the dehumidification heat exchanger is reduced, the moisture content is reduced, and the relative humidity is increased. At this time, the air temperature is raised back to the initial temperature (i.e. the temperature before entering the air conditioner) through the temperature-raising heat exchanger, the relative humidity is reduced, and the relative humidity of the air at this time is lower than the initial state (i.e. the moisture content state before entering the air conditioner) because the moisture content in the air at this time is lower than the initial state. Therefore, the air passing through the temperature-rising heat exchanger is finally cooled by the evaporator for air supply, and the effect of no frosting can be realized.
In one embodiment, after controlling the three-way valve to be energized and controlling the opening degree of the second control valve to be decreased to the preset initial opening degree, the step S200 further includes: and detecting the air outlet relative humidity of the dehumidification module, and adjusting the opening of the second control valve according to the air outlet relative humidity and a preset humidity range.
Specifically, the upper limit value and the lower limit value of the preset humidity range may be set according to actual conditions. After entering into the anti-frosting operation mode and controlling the opening degree of the second control valve to be reduced to the preset initial opening degree, the air outlet relative humidity of the dehumidification module can be detected by the humidity sensor, and the controller finely adjusts the opening degree of the second electronic expansion valve according to the air outlet relative humidity of the dehumidification module. For example, when the outlet air relative humidity of the dehumidification module is lower than the lower limit value, the opening degree of the second electronic expansion valve is reduced; and when the relative humidity of the outlet air of the dehumidification module is higher than the upper limit value, the opening degree of the second electronic expansion valve is increased. So, adjust second electronic expansion valve through the air-out relative humidity who combines the dehumidification module who gathers, ensure that actual air-out relative humidity is in appropriate moderate degree within range, improve dehumidification control's accuracy.
Further, in one embodiment, with continued reference to fig. 2, after step S200, the method further comprises step S400.
Step S400: and when the evaporation temperature of the evaporator is detected to be greater than the set exit frost-proof operation temperature threshold value, controlling the air conditioning unit to maintain a preset operation state.
The specific value for setting the temperature threshold for exiting the anti-frosting operation is not unique, for example, a temperature greater than the anti-frosting temperature threshold is selected as the temperature threshold for exiting the anti-frosting operation. When the evaporation temperature of the evaporator is detected to be greater than the set exit frost-prevention operation temperature threshold, the evaporator evaporation temperature can be considered to be higher, frost cannot be generated, the air conditioning unit can be controlled to maintain a preset operation state at the moment, namely, the three-way valve is controlled to be in a power-off state, and the second control valve is controlled to be opened to a set opening value to enter a normal operation state.
In one embodiment, an anti-frosting control device for an air conditioning unit is also provided, as shown in fig. 3, including a temperature acquisition module 100 and an anti-frosting control module 200.
The temperature acquisition module 100 is used for acquiring evaporation temperature acquired by an evaporator of the air conditioning unit; the anti-frosting control module 200 is configured to control the dehumidification module to reduce the relative humidity of the airflow passing through the evaporator of the air conditioning unit by using the refrigerant output by the condenser of the air conditioning unit when the evaporation temperature is less than a preset anti-frosting temperature threshold; wherein, dehumidification module sets up in the air intake of evaporimeter.
In one embodiment, the anti-frosting control module 200 is further configured to control the air conditioning unit to maintain the preset operation state when the evaporation temperature is greater than or equal to a preset anti-frosting temperature threshold.
In one embodiment, the anti-frosting control module 200 controls the three-way valve to maintain the power-off state and controls the second control valve to open to the set opening value when the evaporation temperature is greater than or equal to the preset anti-frosting temperature threshold.
In one embodiment, the anti-frosting control module 200 controls the three-way valve to be powered on and controls the opening of the second control valve to be reduced to a preset initial opening when the evaporation temperature is less than a preset anti-frosting temperature threshold value, so as to adjust the evaporation temperature of the dehumidifying heat exchanger to be below the dew point.
In one embodiment, the anti-frosting control module 200 controls the three-way valve to be powered on, controls the opening of the second control valve to be reduced to a preset initial opening, detects the outlet air relative humidity of the dehumidification module, and adjusts the opening of the second control valve according to the outlet air relative humidity and a preset humidity range.
In one embodiment, after the anti-frosting control module 200 controls the dehumidification module to reduce the relative humidity of the air flow passing through the evaporator of the air conditioning unit by using the refrigerant output by the condenser of the air conditioning unit, when it is detected that the evaporation temperature of the evaporator is greater than the set exit anti-frosting operation temperature threshold, the air conditioning unit is controlled to maintain the preset operation state.
For specific limitations of the air conditioning unit anti-frosting control device, reference may be made to the above limitations of the air conditioning unit anti-frosting control method, and details are not repeated here. All or part of the modules in the anti-frosting control device of the air conditioning unit can be realized by software, hardware and the combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
Above-mentioned air conditioning unit prevents frosting controlling means, when the evaporating temperature of the evaporimeter of air conditioning unit is less than predetermined prevent frosting temperature threshold value, the control sets up the dehumidification module that utilizes the refrigerant of condenser output to reduce the air current relative humidity through the evaporimeter in the air intake department of evaporimeter and restraines frosting, does not need the air conditioning unit to stop refrigeration also can effectively restrain the frosting problem of evaporimeter, guarantees that the air conditioning unit refrigeration is incessant, has avoided the air conditioning unit to stop refrigeration and has leaded to the harmful effects, has improved the reliability of preventing frosting operation.
In one embodiment, there is also provided an air conditioning system including an air conditioning unit, a temperature sensor, a humidity sensor, and a controller, the air conditioning unit including: the system comprises a compressor, a gas-liquid separator, a condenser, a first control valve, a three-way valve, an evaporator and a dehumidification module; the compressor is connected with the gas-liquid separator and the condenser, the gas-liquid separator is connected with the evaporator and the dehumidification module, the dehumidification module is connected to the first end of three-way valve, the evaporator and the first control valve are connected to the second end of three-way valve, the condenser is connected to the first control valve, the condenser is connected to the third end of three-way valve, the three-way valve makes the first end and the second end of three-way valve switch on when the power-off state, the three-way valve makes the first end and the third end of three-way valve switch on when the power-on state.
The dehumidification module is arranged at an air inlet of the evaporator; the temperature sensor is arranged on the evaporator, the humidity sensor is arranged on the dehumidification module, the controller is connected with the temperature sensor, the humidity sensor, the three-way valve, the first control valve and the dehumidification module, and the controller is used for performing anti-frosting control according to the method.
Further, in one embodiment, the dehumidification module comprises a second control valve, a dehumidification heat exchanger and a temperature rise heat exchanger, the temperature rise heat exchanger is located between the evaporator and the dehumidification heat exchanger, the temperature rise heat exchanger is connected with the first end of the three-way valve and the second control valve, the dehumidification heat exchanger is connected with the second control valve and the gas-liquid separator, and the controller is connected with the second control valve.
In addition, the air conditioning unit can also comprise a condensation fan and an evaporation fan, wherein the condensation fan is arranged on the condenser, and the evaporation fan is arranged on the evaporator.
Above-mentioned air conditioning system, when the evaporating temperature of the evaporimeter of air conditioning unit is less than predetermined anti-frosting temperature threshold value, the control sets up the dehumidification module that utilizes the refrigerant of condenser output to reduce the air current relative humidity through the evaporimeter in the air intake department of evaporimeter and restraines frosting, does not need the air conditioning unit to stop refrigeration also can effectively restrain the frosting problem of evaporimeter, guarantees that the refrigeration of air conditioning unit is incessant, has avoided the air conditioning unit to stop refrigeration and has leaded to harmful effects, has improved the reliability of anti-frosting operation.
In order to better understand the anti-frosting control method, the anti-frosting control device and the air conditioning system of the air conditioning unit, the following detailed explanation is provided in conjunction with specific embodiments.
The application provides an air conditioning system and control scheme who prevents frosting when evaporimeter evaporating temperature is less than 0 ℃, opens the dehumidification function through relevant valve control, lets the air pass through built-in dehumidification module earlier, reduces the air relative humidity through the evaporimeter, destroys the low temperature condition of frosting, is guaranteeing that the evaporimeter cooling is not influenced under the prerequisite, prevents that the evaporimeter from frosting.
As shown in fig. 4, the structure of the air conditioning system is illustrated: the air conditioner mainly comprises a general refrigeration module and a dehumidification module, wherein the general refrigeration module consists of a compressor 1, a gas-liquid separator 2, a condensing fan 3, a condenser 4, a first electronic expansion valve 5, a three-way valve 6, an evaporating fan 7 and an evaporator 8; the dehumidification module 9 consists of a second electronic expansion valve 91, a dehumidification heat exchanger 92 and a heating heat exchanger 93; the three-way valve 6 is used for controlling the opening and closing of the pre-dehumidification and anti-frosting functions.
Air conditioning unit normal operating, the evaporating temperature of evaporimeter 8 is higher, can not produce the frosting, and at this moment, three-way valve 6 keeps the outage state, and cold media flow direction is in the system: the air conditioner comprises a compressor 1, a condenser 4, a first electronic expansion valve 5, an evaporator 8 and a gas-liquid separator 2, wherein a part of refrigerant flows into a heating heat exchanger 93 through a three-way valve 6 after being throttled by the first electronic expansion valve 5, and then flows into a gas suction pipe after continuously flowing through a dehumidification heat exchanger 92 through a second electronic expansion valve 91 to be mixed with another path of refrigerant to enter the gas-liquid separator 2. At this time, the dehumidification module 9 is used as a supplement to the evaporator, the flow rate of the refrigerant entering the dehumidification module 9 is controlled by adjusting the opening degree of the second electronic expansion valve 91, and the warming heat exchanger 93 and the dehumidification heat exchanger 92 both serve as the evaporator functions.
When the evaporation temperature of an evaporator 8 of the air conditioning unit is lower than 0 ℃, the air conditioning unit needs to enter a frosting prevention operation state, the three-way valve 6 is electrified, a main-path refrigerant still flows according to the compressor 1, the condenser 4, the first electronic expansion valve 5, the evaporator 8 and the gas-liquid separator 2, and a part of high-temperature refrigerant is shunted behind the condenser 4 and enters the heating heat exchanger 93 through the three-way valve 6, and then enters the dehumidifying heat exchanger 92 after being throttled by the second electronic expansion valve 91. The evaporation temperature in the dehumidifying heat exchanger 92 is adjusted to be below the dew point through the second electronic expansion valve 91, the water vapor is condensed after the air passes through the dehumidifying heat exchanger 92 and is precipitated and removed in the form of condensed water, then the air temperature is reduced after passing through the dehumidifying heat exchanger 92, the moisture content is reduced, the relative humidity is increased, at this time, the air temperature is increased to the initial temperature (namely the temperature before entering the air conditioner) through the heating heat exchanger 93, the relative humidity is reduced, and the relative humidity of the air at this time is lower than the initial state (namely the moisture content state before entering the air conditioner) because the moisture content in the air at this time is lower than the initial state; the air passing through the warming heat exchanger 93 is finally cooled by the evaporator 8 for air supply, so that the effect of no frosting can be realized. Fig. 5 is a schematic flow diagram of the three-way valve 6 in a normal operation state of the air conditioning unit, and fig. 6 is a schematic flow diagram of the three-way valve 6 in an anti-frosting operation state of the air conditioning unit.
The control flow for switching between the normal operation state and the anti-frosting operation state of the air conditioning unit is shown in fig. 7, which is described as follows:
when the evaporation temperature of the evaporator 8 is lower than the set frosting temperature, the three-way valve 6 is electrified, meanwhile, the second electronic expansion valve 91 is opened to the initial opening degree, the frosting prevention operation is carried out, and otherwise, the normal operation state is kept.
When the evaporation temperature of the evaporator 8 is higher than the set exit frost prevention temperature, the three-way valve 6 is powered off, meanwhile, the second electronic expansion valve 91 is opened to the set value, and the normal operation state is entered, otherwise, the frost prevention operation state is maintained.
After entering the anti-frosting operation, the second electronic expansion valve adjustment control is shown in fig. 8 and is explained as follows:
when the relative humidity of the outlet air of the dehumidification module 9 is lower than the preset minimum value, it indicates that the dehumidification module 9 is in the low temperature state
When the dehumidification amount is too large or the temperature rise amplitude of the temperature rise heat exchanger 93 is too high, the opening degree of the second electronic expansion valve 91 needs to be reduced, so that the flow rate of the refrigerant entering the dehumidification module 9 is reduced, and the dehumidification effect is weakened.
When the relative humidity of the outlet air of the dehumidification module 9 is detected to be higher than the preset highest value, which indicates that the dehumidification amount of the dehumidification module 9 is too small, the opening degree of the second electronic expansion valve 91 needs to be increased, so that the flow rate of the refrigerant entering the dehumidification module 9 is increased, and the dehumidification amount is increased.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. An air conditioning unit frost prevention control method, comprising:
acquiring evaporation temperature acquired by an evaporator of an air conditioning unit;
when the evaporation temperature is lower than a preset anti-frosting temperature threshold value, controlling the dehumidification module to reduce the relative humidity of the airflow passing through an evaporator of the air conditioning unit by using a refrigerant output by a condenser of the air conditioning unit; the dehumidification module is arranged at an air inlet of the evaporator; the dehumidification system comprises an evaporator, a dehumidification heat exchanger, a heating heat exchanger, a temperature rise heat exchanger, a dehumidification module and a dehumidification module, wherein the first end of a three-way valve of the air conditioning unit is connected with the dehumidification module, the second end of the three-way valve is connected with the evaporator and a first control valve of the air conditioning unit, the first control valve is connected with a condenser of the air conditioning unit, the dehumidification module comprises a second control valve, the dehumidification heat exchanger and the temperature rise heat exchanger, the heating heat exchanger is located between the evaporator and the dehumidification heat exchanger, the heating heat exchanger is connected with the first end of the three-way valve and the second control valve, and the dehumidification heat exchanger is connected with the second control valve and a gas-liquid separator of the air conditioning unit;
the third end of the three-way valve is connected with the condenser, the first end and the second end of the three-way valve are communicated when the three-way valve is in a power-off state, and the first end and the third end of the three-way valve are communicated when the three-way valve is in a power-on state; the control dehumidification module utilizes the refrigerant of air conditioning unit's condenser output to reduce the air current relative humidity through air conditioning unit's evaporimeter, includes: and controlling the three-way valve to be electrified, and controlling the opening degree of the second control valve to be reduced to a preset initial opening degree so as to adjust the evaporation temperature of the dehumidification heat exchanger to be below a dew point.
2. The air conditioning unit frost prevention control method according to claim 1, wherein after acquiring the evaporation temperature collected by an evaporator of the air conditioning unit, the method further comprises:
and when the evaporation temperature is greater than or equal to a preset anti-frosting temperature threshold value, controlling the air conditioning unit to maintain a preset running state.
3. The air conditioning unit frost prevention control method according to claim 2, wherein after controlling the three-way valve to be energized and controlling the opening degree of the second control valve to be decreased to a preset initial opening degree, further comprising:
and detecting the air outlet relative humidity of the dehumidification module, and adjusting the opening degree of the second control valve according to the air outlet relative humidity and a preset humidity range.
4. The air conditioning unit frost prevention control method of claim 2, wherein the controlling the air conditioning unit to maintain a preset operation state comprises:
controlling the three-way valve to keep a power-off state and controlling the second control valve to be opened to a set opening value; wherein the set opening value is greater than the initial opening.
5. The air conditioning unit anti-frosting control method according to claim 2, wherein the control dehumidification module, after reducing the relative humidity of the air flow passing through the evaporator of the air conditioning unit by using the refrigerant output by the condenser of the air conditioning unit, further comprises:
and when detecting that the evaporation temperature of the evaporator is greater than a set exit frost-proof operation temperature threshold value, controlling the air conditioning unit to maintain a preset operation state.
6. An air conditioning unit frost prevention control apparatus, comprising:
the temperature acquisition module is used for acquiring evaporation temperature acquired by an evaporator of the air conditioning unit;
the anti-frosting control module is used for controlling the dehumidification module to reduce the relative humidity of the airflow passing through the evaporator of the air conditioning unit by using a refrigerant output by the condenser of the air conditioning unit when the evaporation temperature is less than a preset anti-frosting temperature threshold value; the dehumidification module is arranged at an air inlet of the evaporator; the dehumidification system comprises an evaporator, a dehumidification heat exchanger, a heating heat exchanger, a temperature rise heat exchanger, a dehumidification module and a dehumidification module, wherein the first end of a three-way valve of the air conditioning unit is connected with the dehumidification module, the second end of the three-way valve is connected with the evaporator and a first control valve of the air conditioning unit, the first control valve is connected with a condenser of the air conditioning unit, the dehumidification module comprises a second control valve, the dehumidification heat exchanger and the temperature rise heat exchanger, the heating heat exchanger is located between the evaporator and the dehumidification heat exchanger, the heating heat exchanger is connected with the first end of the three-way valve and the second control valve, and the dehumidification heat exchanger is connected with the second control valve and a gas-liquid separator of the air conditioning unit;
the third end of the three-way valve is connected with the condenser, the first end and the second end of the three-way valve are communicated when the three-way valve is in a power-off state, and the first end and the third end of the three-way valve are communicated when the three-way valve is in a power-on state; the control dehumidification module utilizes the refrigerant of air conditioning unit's condenser output to reduce the air current relative humidity through air conditioning unit's evaporimeter, includes: and controlling the three-way valve to be electrified, and controlling the opening degree of the second control valve to be reduced to a preset initial opening degree so as to adjust the evaporation temperature of the dehumidification heat exchanger to be below a dew point.
7. An air conditioning system, characterized in that, includes air conditioning unit, temperature sensor, humidity transducer and controller, air conditioning unit includes: the system comprises a compressor, a gas-liquid separator, a condenser, a first control valve, a three-way valve, an evaporator and a dehumidification module; the compressor is connected with the gas-liquid separator and the condenser, the gas-liquid separator is connected with the evaporator and the dehumidification module, a first end of the three-way valve is connected with the dehumidification module, a second end of the three-way valve is connected with the evaporator and the first control valve, the first control valve is connected with the condenser, a third end of the three-way valve is connected with the condenser, the first end and the second end of the three-way valve are communicated when the three-way valve is in a power-off state, and the first end and the third end of the three-way valve are communicated when the three-way valve is in a power-on state;
the dehumidification module is arranged at an air inlet of the evaporator; the temperature sensor is arranged on the evaporator, the humidity sensor is arranged on the dehumidification module, the controller is connected with the temperature sensor, the humidity sensor, the three-way valve, the first control valve and the dehumidification module, and the controller is used for carrying out anti-frosting control according to the method of any one of claims 1 to 5;
the dehumidification module comprises a second control valve, a dehumidification heat exchanger and a temperature rise heat exchanger, the temperature rise heat exchanger is located between the evaporator and the dehumidification heat exchanger, the temperature rise heat exchanger is connected with the first end of the three-way valve and the second control valve, the dehumidification heat exchanger is connected with the second control valve and the gas-liquid separator, and the controller is connected with the second control valve.
8. The air conditioning system of claim 7, wherein the air conditioning unit further comprises a condensing fan and an evaporating fan, the condensing fan being disposed on the condenser, the evaporating fan being disposed on the evaporator.
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