Defrosting control method and device of air conditioning unit and air conditioning unit

Abstract

The application relates to the air conditioning technical field, and provides a defrosting control method and device of an air conditioning unit and the air conditioning unit, the defrosting control method of the air conditioning unit comprising the following steps: detecting the outdoor ambient temperature when the air conditioning unit is in heating operation; obtaining an ability output attenuation coefficient of the air conditioning unit when the outdoor ambient temperature is less than zero; determining that the outdoor ambient temperature and the ability output attenuation coefficient meet preset conditions, and controlling the air conditioning unit to enter a corresponding defrosting mode; wherein the ability output attenuation coefficient is the ratio of the current power value of the heating ability output of the air conditioning unit to the maximum power value. The application can realize accurate defrosting, achieves the purpose of defrosting when there is frost and not defrosting when there is no frost, and is beneficial to energy saving.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and in particular to a defrosting control method, device, and air conditioning unit for an air conditioning unit. Background Technology

[0002] Currently, during heating operation, heat pump water heater air conditioning units experience frost formation on the evaporator. The common defrosting method involves entering defrost mode when the temperature difference between the evaporator coil and the outdoor ambient temperature reaches a set temperature and remains there for a certain period, thus defrosting the outdoor evaporator. However, when the heat pump water heater air conditioning unit is in a low-temperature environment, the following problem arises: although the evaporator surface temperature is low, no frost has formed, causing the unit to mistakenly enter defrost mode, resulting in higher power consumption. Summary of the Invention

[0003] This invention provides a defrosting control method, device, and air conditioning unit for air conditioning units, which solves the problem of high power consumption caused by the unit misjudging and entering the defrosting mode in low-temperature environments in related technologies. It can achieve precise defrosting, and achieve the purpose of defrosting when there is frost and not defrosting when there is no frost, which is conducive to energy saving.

[0004] This invention provides a defrosting control method for an air conditioning unit, comprising:

[0005] Detect the outdoor ambient temperature when the air conditioning unit is in heating mode;

[0006] When the outdoor ambient temperature is less than zero, obtain the capacity output attenuation coefficient of the air conditioning unit;

[0007] Once the outdoor ambient temperature and the capacity output attenuation coefficient are determined to meet preset conditions, the air conditioning unit is controlled to enter the corresponding defrost mode.

[0008] The capacity output attenuation coefficient is the ratio of the current power value to the maximum power value of the air conditioning unit's heating capacity output.

[0009] According to the defrosting control method for an air conditioning unit provided by the present invention, the step of determining that the outdoor ambient temperature and the capacity output attenuation coefficient meet preset conditions and controlling the air conditioning unit to enter the corresponding defrosting mode specifically includes:

[0010] Once it is determined that the outdoor ambient temperature meets the defrosting conditions and the capacity output attenuation coefficient is less than the first preset coefficient, the air conditioning unit is controlled to enter the first defrosting mode for defrosting and the heating operation is stopped.

[0011] If it is determined that the outdoor ambient temperature has not reached the defrosting condition and the capacity output attenuation coefficient is less than the second preset coefficient, the air conditioning unit is controlled to enter the second defrosting mode to defrost and stop heating operation.

[0012] Wherein, the first preset coefficient and the second preset coefficient are the upper and lower limits of the preset coefficient range corresponding to the outdoor ambient temperature.

[0013] A defrosting control method for an air conditioning unit according to the present invention further includes:

[0014] Once it is determined that the outdoor ambient temperature meets the defrosting conditions and the capacity output attenuation coefficient is greater than or equal to the first preset coefficient, the air conditioning unit is controlled to enter the third defrosting mode, in which heating operation continues.

[0015] A defrosting control method for an air conditioning unit according to the present invention further includes:

[0016] If it is determined that the outdoor ambient temperature has not reached the defrosting condition and the capacity output attenuation coefficient is greater than or equal to the second preset coefficient, the air conditioning unit is controlled to enter the fourth defrosting mode, in which heating operation continues.

[0017] A defrosting control method for an air conditioning unit according to the present invention further includes:

[0018] When the outdoor ambient temperature is greater than or equal to zero, if the outdoor ambient temperature is determined to meet the defrosting conditions, the air conditioning unit is controlled to enter the fifth defrosting mode to defrost and stop heating operation.

[0019] If the outdoor ambient temperature does not meet the defrosting requirements, the air conditioning unit will continue to operate in heating mode.

[0020] According to the defrosting control method for an air conditioning unit provided by the present invention, the step of reaching the defrosting condition at the outdoor ambient temperature specifically includes:

[0021] Detect the coil temperature of the evaporator of the air conditioning unit;

[0022] If the difference between the outdoor ambient temperature and the coil temperature is greater than or equal to the preset defrost temperature, the outdoor ambient temperature meets the defrost condition.

[0023] According to a defrosting control method for an air conditioning unit provided by the present invention, the step of obtaining the capacity output attenuation coefficient of the air conditioning unit when the outdoor ambient temperature is less than zero specifically includes:

[0024] When the outdoor ambient temperature is less than zero, the inlet water temperature, outlet water temperature, and water flow rate of the air conditioning unit are measured.

[0025] Based on the inlet water temperature, outlet water temperature, and water flow rate of the air conditioning unit, the current power value of the air conditioning unit's capacity output is obtained;

[0026] The capacity output attenuation coefficient is obtained based on the current power value of the heating capacity output of the air conditioning unit.

[0027] According to the defrosting control method of an air conditioning unit provided by the present invention, the capacity output power value of the air conditioning unit satisfies the expression:

[0028] P=C×60×Q×(TWO-TWI) / 1000 / 3600;

[0029] Where P is the power output value in kilowatts; C is the specific heat capacity of water in joules per kilogram per degree Celsius; Q is the water flow rate in liters per minute; TWI is the inlet water temperature in degrees Celsius; and TWO is the outlet water temperature in degrees Celsius.

[0030] The present invention also provides a defrosting control device for an air conditioning unit, comprising:

[0031] The detection module is used to detect the outdoor ambient temperature when the air conditioning unit is in heating mode;

[0032] The acquisition module is used to acquire the capacity output attenuation coefficient of the air conditioning unit when the outdoor ambient temperature is less than zero.

[0033] The control module is used to determine that the outdoor ambient temperature and the capacity output attenuation coefficient meet preset conditions, and control the air conditioning unit to enter the corresponding defrosting mode.

[0034] The capacity output attenuation coefficient is the ratio of the current power value to the maximum power value of the air conditioning unit's heating capacity output.

[0035] The present invention also provides an air conditioning unit, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the defrosting control method of the air conditioning unit as described above.

[0036] The defrosting control method, device, and air conditioning unit provided by this invention detect the outdoor ambient temperature during the heating operation of the air conditioning unit. When the outdoor ambient temperature is less than zero, the capacity output attenuation coefficient of the air conditioning unit is obtained. When it is determined that the outdoor ambient temperature and the capacity output attenuation coefficient meet preset conditions, the air conditioning unit is controlled to enter the corresponding defrosting mode. That is, by introducing the capacity output attenuation coefficient of the air conditioning unit as a judgment basis and combining it with the outdoor ambient temperature to further determine the defrosting operation mode, this invention can reduce the probability of misjudgment in low-temperature environments, achieve precise defrosting in low-temperature environments, and achieve the purpose of defrosting when there is frost and not defrosting when there is no frost, thereby reducing power consumption and promoting energy saving. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in this invention or related technologies, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is one of the structural schematic diagrams of the air conditioning unit provided by the present invention;

[0039] Figure 2 This is a schematic diagram of the heating principle of the air conditioning unit provided by the present invention;

[0040] Figure 3 This is a schematic diagram of the refrigeration principle of the air conditioning unit provided by the present invention;

[0041] Figure 4 This is one of the schematic diagrams of the defrosting control method for air conditioning units provided by the present invention;

[0042] Figure 5 This is the second schematic diagram of the defrosting control method for air conditioning units provided by the present invention;

[0043] Figure 6 This is the third schematic diagram of the defrosting control method for air conditioning units provided by the present invention;

[0044] Figure 7 This is a schematic diagram of the defrosting control device for an air conditioning unit provided by the present invention;

[0045] Figure 8 This is the second structural schematic diagram of the air conditioning unit provided by the present invention.

[0046] Figure label:

[0047] 100: Inlet water flow path; 101: Inlet water valve; 102: Filter; 103: Expansion tank;

[0048] 104: Inlet water temperature sensor;

[0049] 200: Outlet water flow path; 201: Electric heater; 202: Outlet water temperature sensor;

[0050] 203: Flow meter; 204: Water pump; 205: Outlet valve;

[0051] 300: Plate heat exchanger;

[0052] 401: Compressor; 402: Four-way valve; 403: Gas-liquid separator; 404: Evaporator;

[0053] 405: Outdoor ambient temperature sensor; 406: First shut-off valve; 407: Second shut-off valve;

[0054] 408: Electronic expansion valve; 409: Coil temperature sensor;

[0055] 410: First temperature sensor; 411: Second temperature sensor;

[0056] 500: Detection module; 600: Acquisition module; 700: Control module;

[0057] 801: Processor; 802: Communication interface;

[0058] 803: Memory; 804: Communication bus. Detailed Implementation

[0059] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0060] In the description of the embodiments of the present invention, it should be noted that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0061] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0062] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0063] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0064] The following is combined with Figures 1-8 The present invention describes a defrosting control method, apparatus, and air conditioning unit for an air conditioning unit.

[0065] According to one embodiment of the present invention, referring to Figures 1-3 As shown, the present invention provides an air conditioning unit, which is a heat pump hot water air conditioning unit, mainly comprising: a water system and a refrigerant system.

[0066] The water system mainly includes: an inlet water flow path 100, an outlet water flow path 200, and a plate heat exchanger 300. The inlet water flow path 100 is connected to the first end of the plate heat exchanger 300. Along the water inlet direction, the inlet water flow path 100 is sequentially equipped with an inlet valve 101, a filter 102, an expansion tank 103, and an inlet water temperature sensor 104. The inlet valve 101 controls the inlet water flow rate; the filter 102 filters the inlet water. During the heating process, as the water volume increases due to heating, this increased volume can be stored in the expansion tank 103, thereby ensuring stable water pressure. The inlet water temperature sensor 104 is used to detect the inlet water temperature; the outlet water flow path 200 is connected to the second end of the plate heat exchanger 300, and the outlet water flow path 200 is provided with an electric heater 201, an outlet water temperature sensor 202, a flow meter 203, a water pump 204 and an outlet water valve 205 in sequence along the outlet water direction; the electric heater 201 is used to heat the outlet water and can be turned on and off according to actual needs; the outlet water temperature sensor 202 is used to detect the outlet water temperature; the flow meter 203 is used to detect the water flow rate; the water pump 204 is used to realize the circulation of water; and the outlet water valve 205 is used to control the outlet water volume.

[0067] Furthermore, the inlet valve 101 and outlet valve 205 can also be connected to terminal devices such as indoor heat exchangers and underfloor heating systems, thereby enabling indoor heating through the circulation of hot water.

[0068] The refrigerant system mainly includes: compressor 401, four-way valve 402, gas-liquid separator 403, evaporator 404, and outdoor ambient temperature sensor 405. The first port (a) of the four-way valve 402 is connected to the exhaust port of compressor 401; the second port (b) of the four-way valve 402 is connected to the third end of plate heat exchanger 300 via first shut-off valve 406; the fourth end of plate heat exchanger 300 is connected to the first end of evaporator 404 via second shut-off valve 407 and electronic expansion valve 408. First shut-off valve 406 and second shut-off valve 407 are used to regulate the refrigerant flow, and electronic expansion valve 408 is used for throttling; the third port (c) of the four-way valve 402 is connected to the gas-liquid separator 401. The inlet of valve 3 is connected to the outlet of the gas-liquid separator 403, which is connected to the suction port of the compressor 401. The gas-liquid separator 403 is used to separate gaseous fluorine from liquid fluorine, so that gaseous fluorine can flow back into the compressor 401, thereby avoiding liquid slugging in the compressor and protecting the compressor. The fourth port d of the four-way valve 402 is connected to the second end of the evaporator 404. The coil of the evaporator 404 is equipped with a coil temperature sensor 409, which is used to detect the coil temperature of the evaporator 404. The outdoor ambient temperature sensor 405 is used to detect the outdoor ambient temperature. Cooling or heating can be achieved by switching the four-way valve 402.

[0069] In addition, a first temperature sensor 410 is provided at the third end of the plate heat exchanger 300, and a second temperature sensor 411 is provided at the fourth end of the plate heat exchanger 300. The two temperature sensors are used to detect the inlet and outlet refrigerant temperatures at both ends of the plate heat exchanger 300.

[0070] Reference Figure 2 and Figure 3 The working principle of the air conditioning unit of the present invention is described as shown in the figure. The flow direction of water and fluoride is shown by the arrows in the figure.

[0071] like Figure 2 As shown, during the heating operation of the air conditioning unit, in the refrigerant system: the first port a of the four-way valve 402 is connected to the second port b, and the third port c is connected to the fourth port d. The high-temperature and high-pressure gaseous refrigerant generated by the compressor 401 flows into the plate heat exchanger 300 through the first port a and the second port b of the four-way valve 402, where it exchanges heat with the water in the plate heat exchanger 300 to produce hot water. The liquid refrigerant after heat exchange is throttled by the electronic expansion valve 408 and flows into the evaporator 404 to absorb heat and evaporate, obtaining a gas-liquid mixed refrigerant. Then, it flows into the gas-liquid separator 403 through the fourth port d and the third port c of the four-way valve 402 for gas-liquid separation. The obtained gaseous refrigerant flows back to the compressor 401.

[0072] In the water system: water is introduced into the plate heat exchanger 300 through the inlet water flow path 100, and the hot water after heat exchange with fluorine is discharged through the outlet water flow path 200.

[0073] Furthermore, during heating operation, if defrosting is required, the four-way valve 402 can be switched from heating to cooling, changing the direction of refrigerant flow and delivering the high-temperature, high-pressure gaseous refrigerant discharged from the compressor 401 to the evaporator 404 for defrosting.

[0074] like Figure 3 As shown, during the cooling operation of the air conditioning unit, in the refrigerant system: the first port a of the four-way valve 402 is connected to the fourth port d, and the second port b is connected to the third port c. The high-temperature and high-pressure gaseous refrigerant generated by the compressor 401 flows into the evaporator 404 through the first port a and the fourth port d of the four-way valve 402 to release heat. After being throttled by the electronic expansion valve 408, it flows into the plate heat exchanger 300 to exchange heat with the water in the plate heat exchanger 300 to produce cold water. The gas-liquid mixed refrigerant after heat exchange flows into the gas-liquid separator 403 through the second port b and the third port c of the four-way valve 402 for gas-liquid separation. The obtained gaseous refrigerant flows back to the compressor 401.

[0075] In the water system: water is introduced into the plate heat exchanger 300 through the inlet water flow path 100, and the cold water after heat exchange with fluorine is discharged through the outlet water flow path 200.

[0076] Therefore, the air conditioning unit provided in this embodiment of the invention has the above-mentioned multiple operating modes and can adapt to a variety of different working conditions.

[0077] According to one embodiment of the present invention, referring to Figure 4 As shown, the present invention provides a defrosting control method for an air conditioning unit according to the above embodiments, which mainly includes the following steps:

[0078] S100, Detect the outdoor ambient temperature when the air conditioning unit is in heating mode.

[0079] Specifically, when the air conditioning unit is operating in heating mode, the outdoor ambient temperature can be detected in real time by the outdoor ambient temperature sensor 405.

[0080] S200. Obtain the capacity output attenuation coefficient of the air conditioning unit when the outdoor ambient temperature is less than zero.

[0081] Specifically, when the air conditioning unit is in a low-temperature environment, the degree of frost formation on the evaporator surface can be determined by introducing the air conditioning unit's capacity output attenuation coefficient. The smaller the capacity output attenuation coefficient, the smaller the air conditioning heating capacity output, indicating a greater degree of frost formation. The capacity output attenuation coefficient is the ratio of the current power value to the maximum power value of the air conditioning unit's heating capacity output.

[0082] S300: Determine that the outdoor ambient temperature and the capacity output attenuation coefficient meet the preset conditions, and control the air conditioning unit to enter the corresponding defrosting mode.

[0083] The defrosting control method for air conditioning units in this embodiment of the invention introduces the capacity output attenuation coefficient of the air conditioning unit as a judgment basis, and further judges the defrosting operation mode by combining the outdoor ambient temperature. This can reduce the probability of misjudgment in low-temperature environments, achieve precise defrosting in low-temperature environments, and achieve the purpose of defrosting when there is frost and not defrosting when there is no frost, thereby reducing power consumption and facilitating energy saving.

[0084] According to one embodiment of the present invention, referring to Figure 5 As shown, step S300, which determines that the outdoor ambient temperature and the capacity output attenuation coefficient meet preset conditions and controls the air conditioning unit to enter the corresponding defrost mode, specifically includes:

[0085] S301. Determine that the outdoor ambient temperature meets the defrosting conditions and the capacity output attenuation coefficient is less than the first preset coefficient, control the air conditioning unit to enter the first defrosting mode for defrosting, and stop the heating operation.

[0086] S302. If the outdoor ambient temperature does not meet the defrosting conditions and the capacity output attenuation coefficient is less than the second preset coefficient, control the air conditioning unit to enter the second defrosting mode to defrost and stop heating operation.

[0087] Specifically, when the outdoor ambient temperature reaches the defrosting condition, it indicates that the outdoor ambient temperature is very low. At this time, the evaporator surface may or may not be frosted. Therefore, the degree of frosting is further judged by the capacity output attenuation coefficient. When the capacity output attenuation coefficient is less than the first preset coefficient, it indicates that the actual capacity output of the air conditioning unit is low, indicating that the evaporator surface is frosted. When the capacity output attenuation coefficient is greater than or equal to the second preset coefficient and less than the first preset coefficient, it indicates that the degree of evaporator frosting is high. When the capacity output attenuation coefficient is less than the second preset coefficient, it indicates that the degree of evaporator frosting is very high. At this time, the air conditioning unit is controlled to enter the first defrosting mode for defrosting.

[0088] When the outdoor ambient temperature does not meet the defrosting conditions and the capacity output attenuation coefficient is less than the second preset coefficient, it means that the outdoor ambient temperature is not very low but is still a low temperature less than zero, and the capacity output of the air conditioning unit is very low, indicating that the degree of frost on the evaporator surface is high. At this time, the air conditioning unit is controlled to enter the second defrosting mode for defrosting.

[0089] Among them, the first preset coefficient and the second preset coefficient are the upper and lower limits of the preset coefficient range corresponding to the outdoor ambient temperature.

[0090] For example, when the detected outdoor ambient temperature Tao is -25℃≤Tao<-14℃, the preset coefficient range is 60%~70%, and correspondingly, the first preset coefficient is 70% and the second preset coefficient is 60%.

[0091] When the detected outdoor ambient temperature Tao is -14℃≤Tao<-7℃, the preset coefficient range is 50%~60%, and correspondingly, the first preset coefficient is 60% and the second preset coefficient is 50%.

[0092] When the detected outdoor ambient temperature Tao is -7℃≤Tao<0℃, the preset coefficient range is 40%~50%, and correspondingly, the first preset coefficient is 50% and the second preset coefficient is 40%.

[0093] According to one embodiment of the present invention, referring to Figure 5 As shown, step S300, which determines that the outdoor ambient temperature and the capacity output attenuation coefficient meet preset conditions and controls the air conditioning unit to enter the corresponding defrost mode, further includes:

[0094] S303. Determine that the outdoor ambient temperature meets the defrosting conditions and that the capacity output attenuation coefficient is greater than or equal to the first preset coefficient, and control the air conditioning unit to enter the third defrosting mode. In the third defrosting mode, continue to operate in heating mode.

[0095] Specifically, when the outdoor ambient temperature reaches the defrosting condition and the capacity output attenuation coefficient is greater than or equal to the first preset coefficient, it indicates that the outdoor ambient temperature is very low. At this time, the evaporator surface may or may not be frosted. Therefore, the degree of frosting is further judged by the capacity output attenuation coefficient. When the capacity output attenuation coefficient is greater than or equal to the first preset coefficient, it indicates that the actual capacity output of the air conditioning unit is still at a high level, indicating that the evaporator surface is not frosted. At this time, the air conditioning unit is controlled to continue heating operation.

[0096] According to one embodiment of the present invention, referring to Figure 5 As shown, step S300, which determines that the outdoor ambient temperature and the capacity output attenuation coefficient meet preset conditions and controls the air conditioning unit to enter the corresponding defrost mode, further includes:

[0097] S304. If the outdoor ambient temperature does not meet the defrosting conditions and the capacity output attenuation coefficient is greater than or equal to the second preset coefficient, control the air conditioning unit to enter the fourth defrosting mode and continue heating operation in the fourth defrosting mode.

[0098] Specifically, if the outdoor ambient temperature does not meet the defrosting conditions, and the capacity output attenuation coefficient is greater than or equal to the second preset coefficient and less than the first preset coefficient, it indicates that the outdoor ambient temperature is not very low and the capacity output of the air conditioning unit is in a normal state; if the outdoor ambient temperature does not meet the defrosting conditions, and the capacity output attenuation coefficient is greater than or equal to the first preset coefficient, it indicates that the outdoor ambient temperature is not very low and the capacity output of the air conditioning unit is still in a high state. Both of these conditions indicate that the evaporator surface is not frosted, and the air conditioning unit should be controlled to continue heating operation.

[0099] Therefore, by combining the outdoor ambient temperature and the capacity output attenuation coefficient as the basis for determining the defrost operation mode, the air conditioning unit can switch from heating operation to defrost operation in the first and second defrost modes. In the third and fourth defrost modes, it does not defrost but continues to operate in heating mode. This achieves accurate defrosting in low-temperature environments, reduces the probability of misjudgment in low-temperature environments, and achieves the purpose of defrosting when there is frost and not defrosting when there is no frost, thereby reducing power consumption and promoting energy saving.

[0100] According to one embodiment of the present invention, referring to Figure 6 As shown, the defrosting control method for the air conditioning unit of the present invention further includes the following steps:

[0101] S400: When the outdoor ambient temperature is greater than or equal to zero, determine that the outdoor ambient temperature has reached the defrosting condition, control the air conditioning unit to enter the fifth defrosting mode to defrost, and stop the heating operation.

[0102] S500: If the outdoor ambient temperature has not reached the defrosting condition, control the air conditioning unit to continue heating operation.

[0103] Specifically, when the outdoor ambient temperature is greater than or equal to zero, the degree of frost on the evaporator surface is determined by whether the outdoor ambient temperature meets the defrosting conditions. When the outdoor ambient temperature meets the defrosting conditions, it indicates that the evaporator surface is frosted, and the air conditioning unit is controlled to defrost. Conversely, if there is no frost, the air conditioning unit is controlled to continue heating operation.

[0104] According to one embodiment of the present invention, the step of reaching the defrost condition when the outdoor ambient temperature reaches the defrost condition specifically includes: detecting the coil temperature of the evaporator of the air conditioning unit; determining that the difference between the outdoor ambient temperature and the coil temperature is greater than or equal to a preset defrost temperature, indicating that the outdoor ambient temperature has reached the defrost condition. Correspondingly, determining that the difference between the outdoor ambient temperature and the coil temperature is less than the preset defrost temperature, indicating that the outdoor ambient temperature has not reached the defrost condition.

[0105] For example, outdoor ambient temperature: Tao; coil temperature: Te; preset defrost temperature: △T;

[0106] Current output power: P1; Maximum output power: P0;

[0107] First preset coefficient: a; Second preset coefficient: b.

[0108] During the heating operation of the air conditioning unit, the outdoor ambient temperature (Tao) is measured first.

[0109] When Tao < 0, the degree of frost on the evaporator surface is determined by increasing the capacity output attenuation coefficient P1 / P0, and different defrosting modes are entered based on the defrosting conditions:

[0110] If Tao-Te≥△T and P1 / P0<a, enter the first defrost mode to defrost and stop heating operation;

[0111] Tao-Te<△T and P1 / P0<b, enter the second defrost mode to defrost and stop heating operation;

[0112] If Tao-Te≥△T and P1 / P0≥a, then enter the third defrost mode without defrosting and continue heating operation;

[0113] Tao-Te<△T, and P1 / P0≥b, enter the fourth defrosting mode without defrosting, and continue heating operation;

[0114] When Tao ≥ 0, the degree of frost on the evaporator surface is determined by the defrosting conditions, thereby determining whether defrosting is necessary.

[0115] When Tao-Te≥△T, the system enters the fifth defrosting mode and stops heating operation.

[0116] If Tao-Te < △T, continue heating operation.

[0117] According to one embodiment of the present invention, the step of obtaining the capacity output attenuation coefficient of the air conditioning unit when the outdoor ambient temperature is less than zero specifically includes: detecting the inlet water temperature, outlet water temperature, and water flow rate of the air conditioning unit when the outdoor ambient temperature is less than zero; obtaining the current power value of the capacity output of the air conditioning unit based on the inlet water temperature, outlet water temperature, and water flow rate; and obtaining the capacity output attenuation coefficient based on the current power value of the heating capacity output of the air conditioning unit, wherein the capacity output attenuation coefficient is the ratio of the current power value of the heating capacity output of the air conditioning unit to the maximum power value.

[0118] The output power of the air conditioning unit satisfies the following expression:

[0119] P=C×60×Q×(TWO-TWI) / 1000 / 3600;

[0120] Where P is the power output value in kilowatts; C is the specific heat capacity of water in joules per kilogram per degree Celsius; Q is the water flow rate in liters per minute; TWI is the inlet water temperature in degrees Celsius; and TWO is the outlet water temperature in degrees Celsius.

[0121] The defrosting control device for air conditioning units provided by the present invention is described below. The defrosting control device described below can be referred to in correspondence with the defrosting control method described above.

[0122] According to one embodiment of the present invention, referring to Figure 7As shown, the present invention also provides a defrosting control device for an air conditioning unit, mainly comprising: a detection module 500, an acquisition module 600, and a control module 700. The detection module 500 is used to detect the outdoor ambient temperature during the heating operation of the air conditioning unit; the acquisition module 600 is used to acquire the capacity output attenuation coefficient of the air conditioning unit when the outdoor ambient temperature is less than zero; the control module 700 is used to determine that the outdoor ambient temperature and the capacity output attenuation coefficient meet preset conditions, and control the air conditioning unit to enter the corresponding defrosting mode; wherein, the capacity output attenuation coefficient is the ratio of the current power value to the maximum power value of the air conditioning unit's heating capacity output.

[0123] The defrosting control device of this invention uses the capacity output attenuation coefficient of the air conditioning unit as a judgment basis and combines it with the outdoor ambient temperature to further determine the defrosting operation mode. This can reduce the probability of misjudgment in low-temperature environments, achieve precise defrosting in low-temperature environments, and achieve the purpose of defrosting when there is frost and not defrosting when there is no frost, which is beneficial to energy saving.

[0124] like Figure 8 As shown, the present invention also provides an air conditioning unit, which may include: a processor 801, a communication interface 802, a memory 803, and a communication bus 804, wherein the processor 801, the communication interface 802, and the memory 803 communicate with each other through the communication bus 804. The processor 801 can call logical instructions in the memory 803 to execute a defrosting control method for the air conditioning unit, the method including: detecting the outdoor ambient temperature when the air conditioning unit is in heating mode; when the outdoor ambient temperature is less than zero, obtaining the capacity output attenuation coefficient of the air conditioning unit; determining that the outdoor ambient temperature and the capacity output attenuation coefficient meet preset conditions, and controlling the air conditioning unit to enter the corresponding defrosting mode; wherein the capacity output attenuation coefficient is the ratio of the current power value of the air conditioning unit's heating capacity output to the maximum power value.

[0125] Furthermore, the logical instructions in the aforementioned memory 803 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, essentially, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0126] On the other hand, the present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the defrosting control method for the air conditioning unit provided by the above methods. The method includes: detecting the outdoor ambient temperature when the air conditioning unit is in heating mode; obtaining the capacity output attenuation coefficient of the air conditioning unit when the outdoor ambient temperature is less than zero; determining that the outdoor ambient temperature and the capacity output attenuation coefficient meet preset conditions, and controlling the air conditioning unit to enter the corresponding defrosting mode; wherein, the capacity output attenuation coefficient is the ratio of the current power value to the maximum power value of the air conditioning unit's heating capacity output.

[0127] In another aspect, the present invention also provides a non-transitory computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the defrosting control method for an air conditioning unit provided by the above methods. The method includes: detecting the outdoor ambient temperature during the heating operation of the air conditioning unit; obtaining the capacity output attenuation coefficient of the air conditioning unit when the outdoor ambient temperature is less than zero; determining that the outdoor ambient temperature and the capacity output attenuation coefficient meet preset conditions, and controlling the air conditioning unit to enter a corresponding defrosting mode; wherein the capacity output attenuation coefficient is the ratio of the current power value to the maximum power value of the heating capacity output of the air conditioning unit.

[0128] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0129] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0130] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A defrosting control method of an air conditioning unit, characterized by, The method comprises the following steps: detecting an outdoor ambient temperature of an air conditioning unit during heating operation of the air conditioning unit; in a case where the outdoor ambient temperature is less than zero, obtaining an capacity output attenuation coefficient of the air conditioning unit; determining that the outdoor ambient temperature and the capacity output attenuation coefficient meet preset conditions, and controlling the air conditioning unit to enter a corresponding defrosting mode; wherein the capacity output attenuation coefficient is a ratio of a current power value of the heating capacity output of the air conditioning unit to a maximum power value; the step of determining that the outdoor ambient temperature and the capacity output attenuation coefficient meet preset conditions, and controlling the air conditioning unit to enter a corresponding defrosting mode, specifically comprises: determining that the outdoor ambient temperature reaches a defrosting condition and the capacity output attenuation coefficient is less than a first preset coefficient, and controlling the air conditioning unit to enter a first defrosting mode for defrosting and stop heating operation; determining that the outdoor ambient temperature does not reach a defrosting condition and the capacity output attenuation coefficient is less than a second preset coefficient, and controlling the air conditioning unit to enter a second defrosting mode for defrosting and stop heating operation; wherein the first preset coefficient and the second preset coefficient are upper and lower limit values of a preset coefficient range corresponding to the outdoor ambient temperature; further comprising: determining that the outdoor ambient temperature reaches a defrosting condition and the capacity output attenuation coefficient is greater than or equal to the first preset coefficient, and controlling the air conditioning unit to enter a third defrosting mode in which heating operation continues; further comprising: determining that the outdoor ambient temperature does not reach a defrosting condition and the capacity output attenuation coefficient is greater than or equal to the second preset coefficient, and controlling the air conditioning unit to enter a fourth defrosting mode in which heating operation continues; wherein the outdoor ambient temperature and the capacity output attenuation coefficient are combined as a basis for judging the defrosting operation mode, so that the air conditioning unit is switched from heating operation to defrosting operation for defrosting in the first defrosting mode and the second defrosting mode; in the third defrosting mode and the fourth defrosting mode, no defrosting is performed, but heating operation continues, thereby realizing accurate defrosting in a low-temperature environment and reducing the probability of misjudgment in a low-temperature environment.

2. The defrosting control method of an air conditioning unit according to claim 1, characterized by, further comprising: in a case where the outdoor ambient temperature is greater than or equal to zero, determining that the outdoor ambient temperature reaches a defrosting condition, and controlling the air conditioning unit to enter a fifth defrosting mode for defrosting and stop heating operation; determining that the outdoor ambient temperature does not reach a defrosting condition, and controlling the air conditioning unit to continue heating operation.

3. The defrosting control method of an air conditioning unit according to claim 1 or 2, characterized by, the step of determining that the outdoor ambient temperature reaches a defrosting condition, specifically comprises: detecting a coil temperature of an evaporator of the air conditioning unit; determining that a difference between the outdoor ambient temperature and the coil temperature is greater than or equal to a preset defrosting temperature, and the outdoor ambient temperature reaches a defrosting condition.

4. The defrosting control method of an air conditioning unit according to any one of claims 1 or 2, characterized by, the step of obtaining the capacity output attenuation coefficient of the air conditioning unit in a case where the outdoor ambient temperature is less than zero, specifically comprises: in a case where the outdoor ambient temperature is less than zero, detecting an inlet water temperature, an outlet water temperature and a water flow rate of the air conditioning unit; obtaining a current power value of the heating capacity output of the air conditioning unit according to the inlet water temperature, the outlet water temperature and the water flow rate of the air conditioning unit; obtaining the capacity output attenuation coefficient according to the current power value of the heating capacity output of the air conditioning unit.

5. The defrosting control method of an air conditioning unit according to claim 4, wherein, The capacity output power value of the air conditioning unit satisfies the expression: P=C*60*Q*(TWO-TWI) / 1000 / 3600; Wherein, P is the capacity output power value, unit is kilowatt; C is the specific heat capacity of water, unit is joule / kilogram·degree Celsius; Q is water flow, unit is liter / minute; TWI is the inlet water temperature, unit is degree Celsius; TWO is the outlet water temperature, unit is degree Celsius.

6. A defrosting control device for an air conditioning unit, comprising: Comprise: The detection module is used for detecting the outdoor ring temperature when the air conditioning unit is in heating operation; The acquisition module is used for acquiring the capacity output attenuation coefficient of the air conditioning unit when the outdoor ring temperature is less than zero; The control module is used for determining that the outdoor ring temperature and the capacity output attenuation coefficient satisfy the preset condition, and controlling the air conditioning unit to enter the corresponding defrosting mode; Wherein, the capacity output attenuation coefficient is the ratio of the current power value to the highest power value of the heating capacity output of the air conditioning unit; The step of determining that the outdoor ring temperature and the capacity output attenuation coefficient satisfy the preset condition, and controlling the air conditioning unit to enter the corresponding defrosting mode, specifically comprises: Determine that the outdoor ring temperature reaches the defrosting condition, and the capacity output attenuation coefficient is less than the first preset coefficient, control the air conditioning unit to enter the first defrosting mode for defrosting and stop heating operation; Determine that the outdoor ring temperature does not reach the defrosting condition, and the capacity output attenuation coefficient is less than the second preset coefficient, control the air conditioning unit to enter the second defrosting mode for defrosting and stop heating operation; Wherein, the first preset coefficient and the second preset coefficient are the upper and lower limit values of the preset coefficient range corresponding to the outdoor ring temperature; Further comprising: determining that the outdoor ring temperature reaches the defrosting condition, and the capacity output attenuation coefficient is greater than or equal to the first preset coefficient, control the air conditioning unit to enter the third defrosting mode, in the third defrosting mode, continue heating operation; Further comprising: determining that the outdoor ring temperature does not reach the defrosting condition, and the capacity output attenuation coefficient is greater than or equal to the second preset coefficient, control the air conditioning unit to enter the fourth defrosting mode, in the fourth defrosting mode, continue heating operation; Wherein, by combining the outdoor ring temperature and the capacity output attenuation coefficient as the judgment basis of the defrosting operation mode, the air conditioning unit is converted from heating operation to defrosting operation for defrosting in the first defrosting mode and the second defrosting mode; In the third defrosting mode and the fourth defrosting mode, there is no defrosting, but continue heating operation, realize accurate defrosting in low temperature environment, reduce the misjudgment probability in low temperature environment.

7. An air conditioning unit comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein, The processor executes the program to realize the defrosting control method of the air conditioning unit in any one of claims 1-5.

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