CN110762756A - Air conditioning system and air conditioning frosting control method - Google Patents

Air conditioning system and air conditioning frosting control method Download PDF

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Publication number
CN110762756A
CN110762756A CN201911059659.3A CN201911059659A CN110762756A CN 110762756 A CN110762756 A CN 110762756A CN 201911059659 A CN201911059659 A CN 201911059659A CN 110762756 A CN110762756 A CN 110762756A
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CN
China
Prior art keywords
temperature
air conditioner
heat exchanger
adjustable
outdoor heat
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Pending
Application number
CN201911059659.3A
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Chinese (zh)
Inventor
张新明
尚凯峰
王成
周涯宸
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Ningbo Aux Electric Co Ltd
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Ningbo Aux Electric Co Ltd
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Priority to CN201911059659.3A priority Critical patent/CN110762756A/en
Publication of CN110762756A publication Critical patent/CN110762756A/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/30Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/41Defrosting; Preventing freezing
    • F24F11/42Defrosting; Preventing freezing of outdoor units
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/62Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63Electronic processing
    • F24F11/64Electronic processing using pre-stored data
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/62Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63Electronic processing
    • F24F11/65Electronic processing for selecting an operating mode
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/70Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83Control 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/88Electrical aspects, e.g. circuits
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00Control inputs relating to air properties
    • F24F2110/10Temperature
    • F24F2110/12Temperature of the outside air
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00Control inputs relating to air properties
    • F24F2110/20Humidity
    • F24F2110/22Humidity of the outside air
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00Control inputs relating to system states
    • F24F2140/20Heat-exchange fluid temperature

Abstract

The invention provides an air conditioning system and an air conditioning frosting control method, wherein the air conditioning system comprises: the air conditioner comprises a first adjustable throttling device, a second adjustable throttling device, a compressor, an outdoor heat exchanger and an indoor heat exchanger, wherein the first adjustable throttling device is arranged between the outdoor heat exchanger and the indoor heat exchanger, and the second adjustable throttling device is arranged between the outdoor heat exchanger and a return air port of the compressor. The invention can realize the effect of preventing frosting or delaying frosting.

Description

Air conditioning system and air conditioning frosting control method
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioning system and an air conditioner frosting control method.
Background
When the air conditioner runs in a heating mode, if the evaporating temperature of a refrigerant in the outdoor unit heat exchanger is low, the outdoor unit heat exchanger is likely to frost, the heat exchange effect of the outdoor unit heat exchanger can be influenced by frosting, the heating capacity and the heating effect of the air conditioner are influenced, the certain thickness is achieved on a frost layer, the air conditioner needs to be transferred to a cooling operation mode to defrost, and at the moment, the air conditioner blows out cold air, further cooling is conducted indoors, and the comfortable experience of a user is influenced.
Therefore, how to delay or prevent the frosting of the outdoor heat exchanger becomes a technical problem to be solved urgently at present.
Disclosure of Invention
The invention solves the problem of how to delay or prevent the frosting of the heat exchanger of the outdoor unit.
In order to solve the above problems, the present invention provides an air conditioning system including: the air conditioner comprises a first adjustable throttling device, a second adjustable throttling device, a compressor, an outdoor heat exchanger and an indoor heat exchanger, wherein the first adjustable throttling device is arranged between the outdoor heat exchanger and the indoor heat exchanger, and the second adjustable throttling device is arranged between the outdoor heat exchanger and a return air port of the compressor.
The throttling devices are respectively arranged on the two sides of the outdoor heat exchanger, so that the pressure of the refrigerant in the outdoor heat exchanger can be controlled, the evaporation temperature of the refrigerant can be controlled, the frosting is delayed or prevented, meanwhile, the throttling devices are respectively arranged on the two sides of the outdoor heat exchanger, the refrigerant circulation quantity of the air conditioning system can be adjusted, the refrigerant circulation quantity of the air conditioning system can be independently adjusted by the combination of the two throttling devices when the pressure of the refrigerant in the outdoor heat exchanger is increased, other adverse effects caused by the pressure change of the refrigerant in the outdoor heat exchanger are reduced, and the control purpose is smoothly realized.
Optionally, the air conditioning system further includes a vapor-liquid separator, and the second adjustable throttling device is disposed between the vapor-liquid separator and the return air port of the compressor.
The phenomenon that throttling is unstable due to the fact that gas-liquid two-phase refrigerant flows through the second adjustable throttling device is avoided, after the refrigerant is subjected to gas-liquid separation through the gas-liquid separator, only gaseous refrigerant flowing into the second adjustable throttling device is guaranteed, and throttling stability is guaranteed.
Optionally, the first adjustable throttling device and the second adjustable throttling device are electronic expansion valves or orifice plates.
The first adjustable throttling device and the second adjustable throttling device are set to be electronic expansion valves or throttling orifice plates, so that the throttling degree of the first adjustable throttling device/the second adjustable throttling device is adjustable, the throttling degree is adjusted adaptively along with the changes of air conditioner operation parameters and environment parameters, and the control purpose is achieved.
Optionally, the air conditioning system further comprises a temperature and humidity sensor, and the temperature and humidity sensor is arranged on the air inlet side of the outdoor heat exchanger.
The temperature and the humidity of the environment where the air conditioner is located are directly detected through the temperature and humidity sensor, dew point temperature is searched and calculated based on actually detected environment temperature and humidity parameters, more accurate dew point temperature can be obtained, and subsequent accurate control is facilitated.
In order to solve the above problems, the present invention further provides an air conditioner frosting control method, which is used for the air conditioning system, and the air conditioner frosting control method includes the following steps:
after receiving a heating mode operation command, detecting an outer ring temperature and an outer ring humidity, and determining a dew point temperature based on the outer ring temperature and the outer ring humidity;
acquiring the evaporation temperature of a refrigerant in the air-conditioning outdoor heat exchanger;
judging whether the air conditioner is in an easily frosted state or not according to the dew point temperature and the evaporation temperature;
and if the air conditioner is in a frosting-prone state, controlling the first adjustable throttling device to increase the opening degree, and controlling the second adjustable throttling device to decrease the opening degree.
The dew point temperature is determined based on the outer ring temperature and the outer ring humidity in the air conditioner heating operation mode, whether the air conditioner is in an easily frosted state or not is judged based on the dew point temperature and the evaporation temperature of a refrigerant in the outdoor heat exchanger, when the air conditioner is in the easily frosted state, the first adjustable throttling device is controlled to increase the opening degree, the second adjustable throttling device is controlled to decrease the opening degree, the pressure of the refrigerant in the outdoor heat exchanger is increased, the evaporation temperature of the refrigerant in the outdoor heat exchanger is further increased, the temperature difference between the evaporation temperature of the refrigerant in the outdoor heat exchanger and the dew point temperature of outdoor air is reduced, the frosting prevention speed or the frosting speed of the outdoor heat exchanger is reduced, the defrosting period of the air conditioner is prolonged, the heating effect is improved, the total defrosting times are reduced, and the comfort of the air conditioner in.
Optionally, the speed at which the first adjustable throttle device increases the opening degree is equal to the speed at which the second adjustable throttle device decreases the opening degree.
The throttling degree of the first adjustable throttling device and the second adjustable throttling device is ensured to be equivalent to that of a throttling device arranged at the inlet of the outdoor heat exchanger to act independently, so that the control accuracy is improved.
Optionally, the step of controlling the first adjustable throttling device to increase the opening degree and the step of controlling the second adjustable throttling device to decrease the opening degree if the air conditioner is in the frosting prone state includes:
obtaining a temperature difference value obtained by subtracting the dew point temperature from the outer ring temperature, and comparing the temperature difference value with a preset threshold value;
if the temperature difference value is larger than the preset threshold value, obtaining a difference value a obtained by subtracting the dew point temperature from the evaporation temperature;
and when the difference a meets a first preset condition, keeping the current opening degrees of the first adjustable throttling device and the second adjustable throttling device unchanged, wherein the first preset condition comprises that a is greater than 0.
The evaporating temperature of the refrigerant in the outdoor heat exchanger is increased to be higher than the dew point temperature, so that the outdoor heat exchanger can be ensured not to run frosted, and the heating capacity and the use comfort of the air conditioner are improved.
Optionally, the first preset condition further includes a < k, k ∈ (0, 1).
The aim that the outdoor heat exchanger cannot frost and has larger heat exchange temperature difference is fulfilled.
Optionally, the step of obtaining a temperature difference value obtained by subtracting the dew point temperature from the outer ring temperature, and comparing the temperature difference value with a preset threshold value includes:
if the temperature difference value is smaller than or equal to the preset threshold value, obtaining a difference value b obtained by subtracting the evaporation temperature from the outer ring temperature;
and when the difference b meets a second preset condition, keeping the current opening degrees of the first adjustable throttling device and the second adjustable throttling device unchanged, wherein the second preset condition is that T-1 is more than b and less than T, and T is the preset threshold.
When the temperature difference value obtained by subtracting the dew point temperature from the outer ring temperature is smaller than or equal to the preset threshold value and the outdoor air humidity is larger, the evaporation temperature of the outdoor refrigerant can be increased, the frosting speed of the outdoor heat exchanger is reduced, the defrosting period of the outdoor unit is prolonged, the defrosting times are reduced, the heating comfort of the air conditioner is improved, meanwhile, the enough heat exchange amount is ensured, and the adverse effect on heat exchange is avoided.
Optionally, the value range of the preset threshold is 5-15 ℃.
By selecting a proper preset threshold value, the frosting prevention effect can be effectively realized, and meanwhile, the enough heat exchange temperature difference is ensured.
Optionally, the step of determining whether the air conditioner is in an easily frosted state according to the dew point temperature and the evaporation temperature includes:
judging whether the air conditioner meets the condition that the evaporation temperature is less than or equal to the dew point temperature and is less than or equal to 0 ℃;
and if so, judging that the air conditioner is in an easily frosted state.
The condensation and the frosting can be distinguished, and the accuracy of the judgment result is improved.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of an air conditioning system according to the present invention;
FIG. 2 is a schematic structural diagram of an air conditioning system according to another embodiment of the present invention;
FIG. 3 is a schematic diagram of an embodiment of a frosting control method of an air conditioner according to the present invention;
FIG. 4 is a schematic diagram of a detailed step S30 of the frosting control method of the present invention;
FIG. 5 is a pressure-enthalpy diagram of the air conditioner frosting control method according to the present invention;
FIG. 6 is a schematic diagram of an embodiment of a step S40 of the frosting control method of the present invention;
fig. 7 is a schematic diagram of another embodiment of the air conditioner frosting control method according to the subsequent step of step S40.
Description of reference numerals:
1-a first adjustable throttling device, 2-a second adjustable throttling device, 3-a compressor, 4-an outdoor heat exchanger, 5-an indoor heat exchanger, 6-a vapor-liquid separator, 7-a drying filter and 8-a temperature and humidity sensor.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
The invention provides an air conditioning system.
Fig. 1 is a schematic structural diagram of an air conditioning system according to an embodiment of the present invention.
As shown in fig. 1, the air conditioning system includes: the air conditioner comprises a first adjustable throttling device 1, a second adjustable throttling device 2, a compressor 3, an outdoor heat exchanger 4 and an indoor heat exchanger 5, wherein the first adjustable throttling device 1 is arranged between the outdoor heat exchanger 4 and the indoor heat exchanger 5, and the second adjustable throttling device 2 is arranged between the outdoor heat exchanger 4 and a return air port of the compressor 3.
The first adjustable throttling device 1/the second adjustable throttling device 2, which are throttling devices with adjustable throttling degrees, can be a single throttling element or a throttling assembly consisting of a plurality of throttling elements. The first adjustable throttling device 1/the second adjustable throttling device 2 can be an electronic expansion valve or a throttling orifice plate, so that the throttling degree of the first adjustable throttling device 1/the second adjustable throttling device 2 is adjustable, the throttling degree is adjusted adaptively along with the changes of the air conditioner operation parameters and the environmental parameters, and the control purpose is realized.
For convenience of description, the inlet and outlet of the outdoor heat exchanger 4 and the indoor heat exchanger 5 are defined herein with reference to the refrigerant flow direction in the heating mode. The first adjustable throttling device 1 is arranged between the outdoor heat exchanger 4 and the indoor heat exchanger 5, and specifically, the first adjustable throttling device 1 is arranged between an inlet of the outdoor heat exchanger 4 and an outlet of the indoor heat exchanger 5 and is used for throttling, depressurizing and cooling the refrigerant flowing to the outdoor heat exchanger 4, so that the refrigerant can smoothly exchange heat and evaporate in the outdoor heat exchanger 4. Optionally, between the first adjustable throttle 1 and the indoor heat exchanger 5, a dry filter 7 is provided to clean up harmful substances in the refrigerant cycle of the air conditioning system, thereby protecting important components such as the throttle, the compressor, etc. in the air conditioning system.
And the second adjustable throttling device 2 is arranged between the outdoor heat exchanger 4 and the return air port of the compressor 3, and is specifically arranged between the outlet of the outdoor heat exchanger 4 and the return air port of the compressor 3.
The throttling devices are respectively arranged on the two sides of the outdoor heat exchanger 4, so that the pressure of the refrigerant in the outdoor heat exchanger 4 can be controlled, the evaporation temperature of the refrigerant can be controlled, the frosting is delayed or prevented, meanwhile, the throttling devices are respectively arranged on the two sides of the outdoor heat exchanger 4, the refrigerant circulation quantity of the air conditioning system can be adjusted, the refrigerant circulation quantity of the air conditioning system can be independently adjusted by combining the adjustment of the two throttling devices while the pressure of the refrigerant in the outdoor heat exchanger 4 is increased, and other adverse effects caused by the pressure change of the refrigerant in the outdoor heat exchanger 4 are reduced, so that the control purpose is smoothly realized.
Optionally, in the air conditioning system, in addition to the first adjustable throttling device 1 and the second adjustable throttling device 2, other throttling devices are included, which is not limited herein.
Optionally, as shown in fig. 1 or fig. 2, the air conditioning system further includes a vapor-liquid separator 6, and the second adjustable throttle device 2 is disposed between the vapor-liquid separator 6 and the return air port of the compressor 3.
In order to avoid unstable throttling caused by the fact that the gas-liquid two-phase refrigerant flows through the second adjustable throttling device 2, after the gas-liquid separation is carried out on the refrigerant through the gas-liquid separator 6, only the gaseous refrigerant flowing into the second adjustable throttling device 2 is ensured, and the stability of throttling is ensured.
In addition, by respectively arranging the throttling devices at the two sides of the outdoor heat exchanger 4, the speed of the refrigerant entering the vapor-liquid separator 6 is prevented from being too high, the amount of the refrigerant is prevented from being too large, and a large amount of the refrigerant is prevented from being retained in the vapor-liquid separator 6.
Optionally, as shown in fig. 2, the air conditioning system further includes a temperature and humidity sensor 8, where the temperature and humidity sensor 8 is disposed on an air inlet side of the outdoor heat exchanger 4.
The temperature and humidity sensor 8 is arranged on the air inlet side of the air conditioner outdoor unit and used for measuring the temperature and the humidity of the environment where the air conditioner outdoor unit is located, and the dew point temperature is convenient to obtain. The temperature and the humidity of the environment where the air conditioner is located are directly detected through the temperature and humidity sensor 8, the dew point temperature is searched and calculated based on the environment temperature and humidity parameters which are actually detected, more accurate dew point temperature can be obtained, and subsequent accurate control is facilitated.
Optionally, the air conditioning system further comprises a temperature sensor, and the temperature sensor is arranged inside the outdoor heat exchanger 4.
The temperature sensor is arranged at the copper pipe elbow part of the outdoor heat exchanger 4 and is used for detecting the temperature of the refrigerant in the outdoor heat exchanger 4. The evaporation temperature is obtained through direct detection, the accuracy of data is guaranteed, control is directly carried out based on the evaporation temperature, and the accuracy of control is achieved.
The invention also provides an air conditioner frosting control method which is used for the air conditioner system.
Fig. 3 is a schematic diagram of an embodiment of an air conditioner frosting control method according to the present invention.
The air conditioner frosting control method comprises the following steps:
step S10, after receiving a heating mode operation command, detecting an outer ring temperature and an outer ring humidity, and determining a dew point temperature based on the outer ring temperature and the outer ring humidity;
the air conditioner is easy to frost in the heating mode, so that the control of the embodiments of the air conditioner frosting control method is performed after the heating mode operation command is received, namely, the outer ring temperature and the outer ring humidity are detected, and the subsequent frosting delaying or frosting preventing control is performed. When the air conditioner receives a ventilation mode command, a dehumidification mode command, a refrigeration mode command and an automatic mode command, the air conditioner operates in a corresponding mode, and the control of the embodiments of the air conditioner frosting control method is not executed.
Optionally, to ensure stability and accuracy of control, when a heating mode command of the air conditioner is detected, the air conditioner is controlled to operate in the heating mode for a preset time period, and then subsequent frosting delaying or frosting prevention control such as detection of the outer ring temperature and the outer ring humidity is performed.
And detecting the outer ring temperature and the outer ring humidity, wherein the outer ring temperature and the outer ring humidity can be obtained by detecting through a temperature and humidity sensor 8 arranged on the air-conditioning outdoor heat exchanger 4, the outer ring temperature and the outer ring humidity are sampled in real time for improving the accuracy of detected parameters, the sampling results of preset times are averaged, and the average value is used as a final detection result. Alternatively, the outer ring temperature and the outer ring humidity may be detected at preset time intervals.
The enthalpy-humidity diagram fitting function can be prestored in the air conditioner, and the current dew point temperature of the outdoor air can be obtained based on the enthalpy-humidity diagram fitting function after the outer ring temperature and the outer ring humidity are obtained. Compared with the mode that the direct networking is carried out to obtain the dew point temperature based on the geographical position, the mode carries out the searching and calculating of the dew point temperature based on the environment temperature and humidity parameters of actual detection, can obtain more accurate dew point temperature, and is favorable for subsequent accurate control.
Step S20, obtaining the evaporation temperature of the refrigerant in the air conditioner outdoor heat exchanger 4;
the evaporating temperature of the refrigerant in the air-conditioning outdoor heat exchanger 4 can be directly detected and obtained by arranging a temperature sensor on the outdoor heat exchanger 4.
Step S30, judging whether the air conditioner is in a frosting-prone state or not according to the dew point temperature and the evaporation temperature;
whether the air conditioner is in the state of easy frosting can be judged by comparing the evaporating temperature of the refrigerant in the outdoor heat exchanger 4 with the dew point temperature. The frosting-prone state refers to a state that the evaporation temperature of the air conditioner meets possible frosting conditions, generally, frosting needs to meet certain temperature conditions, for example, the evaporation temperature is lower than 0 ℃, if the air conditioner meets related frosting-prone parameter conditions based on the dew point temperature and the evaporation temperature of the air conditioner, the air conditioner is in the frosting-prone state, and in the frosting-prone state, developers determine conditions met by related parameters based on a physical principle, and preset the related conditions in the air conditioner.
Optionally, if the evaporation temperature of the refrigerant in the outdoor heat exchanger 4 is less than or equal to the dew point temperature, determining that the air conditioner is in an easily frosted state; and if the evaporation temperature of the refrigerant in the outdoor heat exchanger 4 is higher than the dew point temperature, judging that the air conditioner is in a frosting prevention state.
Alternatively, as shown in fig. 4, step S30 includes:
step S31, judging whether the air conditioner meets the condition that the evaporation temperature is less than or equal to the dew point temperature and is less than or equal to 0 ℃;
when the evaporation temperature of the refrigerant in the outdoor heat exchanger 4 is less than or equal to the dew point temperature but greater than 0 ℃, the air conditioner is most likely not frosted, and at this time, it should be determined that the air conditioner is in a state of not easily frosting.
And step S32, if yes, determining that the air conditioner is in an easily frosted state.
And if the evaporating temperature is less than or equal to the dew point temperature and the evaporating temperature is less than or equal to 0 ℃, determining that the air conditioner is in an easily frosted state.
When the evaporation temperature is lower than the dew point temperature but higher than 0 ℃, condensation can be generated on the surface of the heat exchanger and basically frost is not formed, the condensation and the frost can be distinguished by setting the evaporation temperature to be less than or equal to the dew point temperature and the evaporation temperature to be less than or equal to 0 ℃ as a judgment condition that the air conditioner is in a frosty state, and the accuracy of a judgment result is improved.
And step S40, if the air conditioner is in a frosting-prone state, controlling the first adjustable throttling device 1 to increase the opening degree, and controlling the second adjustable throttling device 2 to decrease the opening degree.
And if the air conditioner is in a frosting-prone state, controlling a first adjustable throttling device 1 arranged between the inlet of the outdoor heat exchanger 4 and the outlet of the indoor heat exchanger 5 to increase the opening degree, and controlling a second adjustable throttling device 2 arranged between the outlet of the outdoor heat exchanger 4 and the return air inlet of the compressor 3 to decrease the opening degree. Because the first adjustable throttling device 1 and the second adjustable throttling device 2 are respectively arranged at the inlet side and the outlet side of the outdoor heat exchanger 4, the flow of the refrigerant entering the outdoor heat exchanger 4 from the interface side is increased, and the flow of the refrigerant flowing out of the outdoor heat exchanger 4 from the outlet side is limited, so that the pressure of the refrigerant in the outdoor heat exchanger 4 is increased, the evaporation temperature of the refrigerant in the outdoor heat exchanger 4 is increased, and the frosting of the outdoor heat exchanger of the air conditioner is prevented or slowed down.
Although a single throttling device (for example, a throttling device is arranged on the inlet side of an outdoor heat exchanger) arranged in an air conditioning system can also play a role in regulating the pressure of refrigerant in the outdoor heat exchanger, the circulating flow of the refrigerant can be changed along with the regulation of the pressure of the refrigerant, namely the pressure of the refrigerant and the circulating flow of the refrigerant cannot be independently regulated. For example, if the opening degree of the throttling device provided at the inlet side of the outdoor heat exchanger is increased, the flow rate of the refrigerant entering the outdoor heat exchanger is also increased, and if the air conditioning system has other requirements/restrictions on the refrigerant circulation amount, the refrigerant circulation amount may conflict with the frost prevention or frost delay control of the air conditioner, and if the flow rate of the refrigerant entering the vapor-liquid separator 6 is too high, too much refrigerant may be retained in the vapor-liquid separator 6.
In the embodiment of the invention, two throttling devices are respectively arranged on two sides of an outdoor heat exchanger 4 in the air-conditioning system, wherein one throttling device is arranged at an inlet of the outdoor heat exchanger 4 and can slightly increase the flow of the refrigerant in the outdoor heat exchanger 4, and the throttling device is combined with the other throttling device which is arranged at an outlet of the outdoor heat exchanger 4 and has reduced opening degree to jointly increase the pressure of the refrigerant in the outdoor heat exchanger 4, and in addition, the throttling device arranged between the outlet of the outdoor heat exchanger 4 and a return air port of a compressor 3 can control the flow of the refrigerant flowing out of the outdoor heat exchanger 4 and about to flow back to the compressor 3, thereby controlling the circulating flow of the refrigerant of the whole air-conditioning. The refrigerant pressure and the refrigerant flow in the outdoor heat exchanger 4 can be independently adjusted by combining the two throttling devices, and the refrigerant pressure in the outdoor heat exchanger 4 can be controlled and adjusted without interfering with the adjustment of the refrigerant circulation flow.
To facilitate an understanding of the benefits of the embodiments of the present invention, the embodiments of the present invention will be described in detail with reference to the enthalpy-pressure diagram of fig. 5.
Under the conditions that the air conditioner runs in a refrigerating mode and a heating mode but the outdoor heat exchanger 4 is not easy to frost, the function of the first adjustable throttling device 1 is consistent with that of a throttling device in a conventional air conditioning system, and the function of the first adjustable throttling device is mainly used for adjusting the circulation quantity of a refrigerant; in the heating mode of the air conditioner and in the state that the external machine heat exchanger is easy to frost, the first adjustable throttling device 1 and the second adjustable throttling device 2 jointly adjust the circulation flow of the refrigerant, and also play a role in controlling the evaporation temperature of the refrigerant in the outdoor heat exchanger 4. The second adjustable throttling device 2 only has the function of adjusting the evaporation temperature of the refrigerant in the outdoor heat exchanger 4 when the air conditioner is in the heating mode and the outdoor unit of the air conditioner is in the state of easy frosting, and the second adjustable throttling device 2 is in the fully open state and does not have the throttling function under other conditions (such as the ventilation mode, the dehumidification mode and the refrigeration mode).
When the second adjustable throttling device 2 is fully opened, the operation mode of the air conditioning system is consistent with that of a conventional air conditioning system, the theoretical cycle process of the second adjustable throttling device 2 is 1- >2- >3- >4- >1 in fig. 5, when the second adjustable throttling device 2 performs the throttling function, the throttling degree of the first adjustable throttling device 1 is correspondingly reduced, the theoretical cycle process of the second adjustable throttling device is 1- >2- >3- >5- >6- >1, the throttling and pressure reducing processes of the refrigerant are completed in two steps of 3- >5 and 6- >1, the pressure drop at the first adjustable throttling device 1 is reduced, and as can be seen from fig. 4, the pressure corresponding to the evaporation process of the refrigerant in the outdoor heat exchanger 4 is increased from P4 to P5, and the evaporation temperature corresponding to the pressure is correspondingly increased.
Alternatively, when the first adjustable throttle device 1 is controlled to increase the opening degree, the second adjustable throttle device 2 is synchronously controlled to decrease the opening degree, i.e. the second adjustable throttle device 2 is controlled to decrease the opening degree at the same time.
The speed at which the first adjustable throttle 1 increases the opening or the speed at which the second adjustable throttle 2 decreases the opening may be selected to be 5 steps/second.
The dew point temperature is determined based on the outer ring temperature and the outer ring humidity in the air conditioner heating operation mode, whether the air conditioner is in an easily frosted state is judged based on the dew point temperature and the evaporation temperature of the refrigerant in the outdoor heat exchanger 4, when the air conditioner is in the easily frosted state, the first adjustable throttling device 1 is controlled to increase the opening degree, the second adjustable throttling device 2 is controlled to decrease the opening degree, the pressure of the refrigerant in the outdoor heat exchanger 4 is increased, the evaporation temperature of the refrigerant in the outdoor heat exchanger 4 is further increased, the temperature difference between the evaporation temperature of the refrigerant in the outdoor heat exchanger 4 and the dew point temperature of the outdoor air is reduced, the frosting prevention speed or the frosting speed of the outdoor heat exchanger 4 is reduced, the defrosting period of the air conditioner is prolonged, the heating effect is improved, the total defrosting times are reduced, and the comfort of the air conditioner.
Alternatively, the speed at which the first adjustable throttle device 1 increases the opening degree is equal to the speed at which the second adjustable throttle device 2 decreases the opening degree.
When the opening degree of the first adjustable throttling device 1 is increased, the second adjustable throttling device 2 is controlled to reduce the opening degree at the same speed, the throttling degree of the first adjustable throttling device 1 and the second adjustable throttling device 2 in the combined action is ensured, and the throttling degree is equivalent to that when a throttling device is arranged at the inlet of the outdoor heat exchanger 4 to act independently, so that the control accuracy is improved.
Alternatively, as shown in fig. 6, step S40 is followed by:
step S50, obtaining a temperature difference value obtained by subtracting the dew point temperature from the outer ring temperature, and comparing the temperature difference value with a preset threshold value;
the temperature difference between the outer ring temperature and the dew point temperature reflects the outer ring humidity to a certain extent, when the temperature difference obtained by subtracting the dew point temperature from the outer ring temperature is larger, the outer ring humidity is smaller, and when the temperature difference obtained by subtracting the dew point temperature from the outer ring humidity is smaller, the outer ring humidity is larger. The temperature difference value obtained by subtracting the dew point temperature from the outer ring temperature is different, and the corresponding throttling devices have different adjusting and stopping conditions.
The preset threshold value can be a preset fixed value or a value which changes along with the temperature change of outdoor air, the selection of the preset threshold value cannot be too small, the corresponding heat exchange temperature difference is small because the preset threshold value is small, the effective heat exchange of the outdoor heat exchanger 4 can not be realized, meanwhile, the selection of the preset threshold value cannot be too large, and the frosting delaying effect is not obvious because the selection of the preset threshold value is too large.
Optionally, the value range of the preset threshold is 5-15 ℃. The optimal value can be determined by experiment. By selecting a proper preset threshold value, the frosting prevention effect can be effectively realized, and meanwhile, the enough heat exchange temperature difference is ensured.
Optionally, different preset thresholds may be set in the air conditioner, and the preset thresholds are selected by the user on an autonomous basis according to the requirement, for example, when the user needs a higher comfort level, it is indicated that the user does not want to defrost too many times, and the control of preventing or delaying frosting needs to be strengthened, and at this time, the preset thresholds may have a smaller value; when the outdoor air temperature is very low and the heating capacity of the air conditioner is expected to be improved, the heat exchange temperature difference of the outdoor heat exchanger 4 is required to be larger, and at the moment, the preset threshold value can take a larger value.
Step S60, if the temperature difference value is larger than the preset threshold value, obtaining a difference value a obtained by subtracting the dew point temperature from the evaporation temperature;
when the temperature difference value obtained by subtracting the dew point temperature from the outer ring temperature is larger than the preset threshold value, the adjustment stopping time of the first adjustable throttling device 1 and the second adjustable throttling device 2 can be determined according to the magnitude relation between the evaporation temperature and the dew point temperature.
And step S70, when the difference a meets a first preset condition, keeping the current opening degrees of the first adjustable throttle device 1 and the second adjustable throttle device 2 unchanged, where the first preset condition includes that a > 0.
The evaporating temperature of the refrigerant in the outdoor heat exchanger 4 is increased to be higher than the dew point temperature, so that the outdoor heat exchanger 4 can be ensured not to frost, and the heating capacity and the use comfort of the air conditioner are improved.
Optionally, the first preset condition further includes a < k, k ∈ (0, 1).
When the evaporation temperature of the refrigerant in the outdoor heat exchanger 4 is controlled to rise, the problem that the heat exchange temperature difference (the temperature difference obtained by subtracting the evaporation temperature of the refrigerant from the outer ring temperature) of the outdoor heat exchanger 4 is too low due to the rise of the evaporation temperature of the refrigerant is avoided, and otherwise, the risk that the heat exchange cannot be effectively carried out exists.
When the temperature difference value is larger than a preset threshold value, the outer ring temperature is far larger than the dew point temperature, and the temperature range with a large difference from the dew point temperature to the outer ring temperature is shown, at the moment, when the refrigerant evaporation temperature is higher than the outdoor air dew point temperature (namely a is larger than 0), the outdoor heat exchanger cannot frost, but under the condition of no frost, the heat exchange temperature difference is reduced too much due to the fact that the difference between the refrigerant evaporation temperature and the outdoor air dew point temperature is too large, therefore, a is limited to be smaller than k, and k belongs to (0, 1), and when a is smaller than k, and k belongs to (0, 1), the purpose that the outdoor heat exchanger cannot frost and has a large heat exchange temperature difference can be achieved.
Alternatively, as shown in fig. 7, step S50 is followed by:
step S80, if the temperature difference value is less than or equal to the preset threshold value, obtaining a difference value b obtained by subtracting the evaporation temperature from the outer ring temperature;
the difference b obtained by subtracting the evaporation temperature from the outer ring temperature is the heat exchange temperature difference of the outdoor heat exchanger 4, when the value is too large, the outdoor heat exchanger 4 frosts quickly, the air conditioner can frost frequently, and when the value is too small, the heat exchange amount is small, so that the value needs to be controlled in a moderate range, the frosting of the air conditioner outdoor heat exchanger 4 cannot be too quick, and meanwhile, the larger heat exchange amount can be realized.
And step S90, when the difference b meets a second preset condition, keeping the current opening degrees of the first adjustable throttling device 1 and the second adjustable throttling device 2 unchanged, wherein the second preset condition is that T-1 is more than b and less than T, and T is the preset threshold.
When the temperature difference value obtained by subtracting the dew point temperature from the outer ring temperature is larger than the preset threshold value, namely the outer ring humidity is smaller, the difference between the dew point temperature and the outer ring temperature is larger, the evaporation temperature of the refrigerant is adjusted to be higher than the dew point temperature, the condition that a is more than 0 and less than k and k belongs to (0, 1) is met, the frosting of the outdoor heat exchanger 4 can be avoided, meanwhile, the outdoor heat exchanger 4 has larger heat exchange temperature difference, and the heat exchange amount cannot be greatly attenuated; when the humidity of the outer ring is larger, the difference between the dew point temperature and the temperature of the outer ring is smaller, if 0 < a < k, k epsilon (0, 1) is still used as the adjustment cut-off condition, the evaporation temperature of the refrigerant is controlled to be adjusted to be higher than the dew point temperature, although frosting of the outdoor heat exchanger 4 can be avoided, the heat exchange temperature difference of the outdoor heat exchanger 4 is small, and the heat exchange amount is greatly attenuated, so that the difference b obtained by subtracting the evaporation temperature from the outer ring temperature is controlled to be T-1 < b < T.
When the temperature difference value obtained by subtracting the dew point temperature from the outer ring temperature is smaller than or equal to the preset threshold value and the outdoor air humidity is larger, the evaporation temperature of the outdoor refrigerant is increased by adjusting the first adjustable throttling device 1 and the second adjustable throttling device 2, so that the difference b obtained by subtracting the evaporation temperature from the outer ring temperature meets the condition that T-1 is smaller than b and smaller than T, the frosting speed of the outdoor heat exchanger 4 is reduced, the defrosting period of the outdoor unit is prolonged, the defrosting times are reduced, the heating comfort of the air conditioner is improved, meanwhile, the enough heat exchange amount is ensured, and the adverse effect on heat exchange is avoided.
The difference value obtained by subtracting the dew point temperature from the outer ring temperature is compared with a preset threshold value, the stop conditions of the rising of the evaporation temperature under two different air conditions are distinguished, and when the obtained difference value is smaller than or equal to the preset threshold value, the difference value obtained by subtracting the evaporation temperature from the outer ring temperature (namely, the heat exchange temperature difference) is limited to be about the preset threshold value, so that more accurate control is realized.
Optionally, after receiving a shutdown/mode switching command, detecting a switching condition of the second adjustable throttling device 2, if the second adjustable throttling device 2 is not fully opened, controlling the second adjustable throttling device 2 to be fully opened, and then performing shutdown/mode switching, if the second adjustable throttling device 2 is fully opened, directly switching the mode or shutting down, so as to avoid that the second adjustable throttling device 2 has a negative influence on the operation of the air conditioning system because the air conditioner is in a state where frosting is not easily generated or the air conditioner is not in a heating mode (such as a cooling mode) when the air conditioner is started next time, and the mode switching is also the same.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (11)

1. An air conditioning system, characterized in that the air conditioning system comprises: the air conditioner comprises a first adjustable throttling device (1), a second adjustable throttling device (2), a compressor (3), an outdoor heat exchanger (4) and an indoor heat exchanger (5), wherein the first adjustable throttling device (1) is arranged between the outdoor heat exchanger (4) and the indoor heat exchanger (5), and the second adjustable throttling device (2) is arranged between a return air port of the outdoor heat exchanger (4) and a return air port of the compressor (3).
2. Air conditioning system according to claim 1, further comprising a vapor-liquid separator, wherein the second adjustable restriction (2) is arranged between the vapor-liquid separator (6) and the return air opening of the compressor (3).
3. Air conditioning system according to claim 1 or 2, wherein the first adjustable restriction (1) and the second adjustable restriction (2) are electronic expansion valves or orifice plates.
4. The air conditioning system as claimed in claim 1 or 2, further comprising a temperature and humidity sensor (8), wherein the temperature and humidity sensor (8) is disposed on an air inlet side of the outdoor heat exchanger (4).
5. An air conditioner frosting control method for the air conditioner system of any one of claims 1-4, characterized in that the air conditioner frosting control method comprises the following steps:
after receiving a heating mode operation command, detecting an outer ring temperature and an outer ring humidity, and determining a dew point temperature based on the outer ring temperature and the outer ring humidity;
acquiring the evaporation temperature of a refrigerant in the air-conditioning outdoor heat exchanger (4);
judging whether the air conditioner is in an easily frosted state or not according to the dew point temperature and the evaporation temperature;
and if the air conditioner is in a frosting-prone state, controlling the first adjustable throttling device (1) to increase the opening degree, and controlling the second adjustable throttling device (2) to decrease the opening degree.
6. Air conditioner frosting control method according to claim 5, characterized in that the speed of the first adjustable throttle device (1) increasing the opening degree is equal to the speed of the second adjustable throttle device (2) decreasing the opening degree.
7. The air conditioner frost control method according to claim 5, wherein said step of controlling said first adjustable throttle device (1) to increase the opening degree and said second adjustable throttle device (2) to decrease the opening degree if said air conditioner is in a frost prone state, is followed by the steps of:
obtaining a temperature difference value obtained by subtracting the dew point temperature from the outer ring temperature, and comparing the temperature difference value with a preset threshold value;
if the temperature difference value is larger than the preset threshold value, obtaining a difference value a obtained by subtracting the dew point temperature from the evaporation temperature;
and when the difference a meets a first preset condition, keeping the current opening degrees of the first adjustable throttling device (1) and the second adjustable throttling device (2) unchanged, wherein the first preset condition comprises that a is greater than 0.
8. The air conditioner frost formation control method of claim 7, wherein the first preset condition further comprises a < k, k e (0, 1).
9. The air conditioner frosting control method according to claim 7 or 8, wherein the step of obtaining a temperature difference value obtained by subtracting the dew point temperature from the outer ring temperature, and comparing the temperature difference value with a preset threshold value comprises:
if the temperature difference value is smaller than or equal to the preset threshold value, obtaining a difference value b obtained by subtracting the evaporation temperature from the outer ring temperature;
and when the difference b meets a second preset condition, keeping the current opening degrees of the first adjustable throttling device (1) and the second adjustable throttling device (2) unchanged, wherein the second preset condition is that T-1 is larger than b and smaller than T, and T is the preset threshold.
10. The air conditioner frosting control method of claim 9, wherein the preset threshold value is in a range of 5-15 ℃.
11. The air conditioner frosting control method of any of claims 5-8, wherein the step of judging whether the air conditioner is in a frosting prone state according to the dew point temperature and the evaporation temperature comprises:
judging whether the air conditioner meets the condition that the evaporation temperature is less than or equal to the dew point temperature and is less than or equal to 0 ℃;
and if so, judging that the air conditioner is in an easily frosted state.
CN201911059659.3A 2019-11-01 2019-11-01 Air conditioning system and air conditioning frosting control method Pending CN110762756A (en)

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