Method and apparatus for controlling defrosting of a heat pump system, heat pump system, storage medium

Abstract

The application relates to the technical field of heat exchange systems, and discloses a method for controlling defrosting of a heat pump system, which comprises the following steps: in the case that the heat pump system runs in a heating mode and reaches a steady state, detecting an evaporator coil temperature Tc, a refrigerant flow rate Vc in the evaporator and a fan operation power Qc of an outdoor fan; and according to the evaporator coil temperature Tc, the refrigerant flow rate Vc in the evaporator and the fan operation power Qc of the outdoor fan, controlling the heat pump system to run in a defrosting mode. The application can make the defrosting control more accurate and make the defrosting more clean and thorough. The application also discloses a device for controlling defrosting of a heat pump system, a heat pump system and a storage medium.

Description

Technical Field

[0001] This application relates to the field of heat exchange system technology, such as a method and apparatus for controlling defrosting of a heat pump system, a heat pump system, and a storage medium. Background Technology

[0002] When a heat pump system is operating in heating mode, the evaporator absorbs heat from the outdoor environment. Due to the influence of outdoor temperature and humidity, frost easily forms on the evaporator, affecting the heating capacity of the heat pump system. Therefore, it is necessary to defrost the evaporator.

[0003] There are various methods for defrosting evaporators, such as reverse defrosting and electric heating defrosting. Currently, the control methods used for air conditioner defrosting include: when the air conditioner enters reverse circulation defrosting mode, controlling the heating of the liquid refrigerant flowing into the indoor heat exchanger; if the outdoor ambient temperature during the heating process meets the gas supply temperature regulation, controlling the supply of gas to the compressor.

[0004] In the process of implementing the embodiments of this disclosure, it was found that at least the following problems exist in the related technology: the defrosting control of the heat pump system is not precise enough, and the defrosting effect is poor. Summary of the Invention

[0005] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0006] This disclosure provides a method and apparatus for controlling defrosting of a heat pump system, a heat pump system, and a storage medium, so that the heat pump system can defrost precisely and thoroughly.

[0007] This disclosure provides a method for controlling defrosting in a heat pump system, including: When the heat pump system is operating in heating mode and has reached a stable state, the evaporator coil temperature Tc, the refrigerant flow rate Vc in the evaporator, and the outdoor fan operating power Qc are measured. The defrosting mode of the heat pump system is controlled based on the evaporator coil temperature Tc, the refrigerant flow rate Vc in the evaporator, and the outdoor fan operating power Qc.

[0008] In some embodiments, the heat pump system is controlled to operate in defrost mode based on the evaporator coil temperature Tc, the refrigerant flow rate Vc in the evaporator, and the outdoor fan operating power Qc, including: When the evaporator coil temperature Tc is less than or equal to the first preset temperature T1 or the refrigerant flow rate Vc in the evaporator is greater than or equal to the first preset flow rate V1, the first continuous running time Ac1 of the compressor is detected. If the first continuous running time Ac1 is greater than or equal to the first preset time A1, then the heat pump system is controlled to start the vibration defrosting mode.

[0009] In some embodiments, controlling the heat pump system to operate in defrost mode based on the evaporator coil temperature Tc, the refrigerant flow rate Vc in the evaporator, and the outdoor fan operating power Qc, further includes: When the evaporator coil temperature Tc is greater than the third preset temperature T3 and less than or equal to the second preset temperature T2, T1 > T2 > T3, or the refrigerant flow rate Vc in the evaporator is greater than or equal to the second preset flow rate V2 and less than the third preset flow rate V3, V1 < V2 < V3, and the fan operating power Qc is greater than or equal to the first preset power Q1 and less than the second preset power Q2, Q1 < Q2, the second continuous running time Ac2 of the compressor is detected. If the second continuous running time Ac2 is greater than or equal to the second preset time A2, and A2 > A1, then the heat pump system is controlled to run both vibration defrosting mode and electric heating defrosting mode simultaneously.

[0010] In some embodiments, controlling the heat pump system to operate in defrost mode based on the evaporator coil temperature Tc, the refrigerant flow rate Vc in the evaporator, and the outdoor fan operating power Qc, further includes: When the evaporator coil temperature Tc is less than or equal to the third preset temperature T3, or the refrigerant flow rate Vc in the evaporator is greater than or equal to the third preset flow rate V3, and the fan operating power Qc is greater than or equal to the second preset power Q2, the third continuous operating time Ac3 of the compressor is detected. If the third continuous running time Ac3 is greater than or equal to the third preset time A3, the heat pump system is controlled to run both vibration defrosting mode and reverse defrosting mode simultaneously.

[0011] In some embodiments, if the third continuous operating time Ac3 is greater than or equal to the third preset time A3, the method further includes controlling the outdoor fan to reverse.

[0012] In some embodiments, after controlling the heat pump system to operate in defrost mode, the method further includes: The defrosting process of the heat pump system is controlled to end based on the defrosting mode, evaporator coil temperature Tc, refrigerant flow rate Vc in the evaporator, and outdoor fan operating power Qc.

[0013] In some embodiments, controlling the heat pump system to end defrosting based on the defrosting mode and based on the evaporator coil temperature Tc, the refrigerant flow rate Vc in the evaporator, and the outdoor fan operating power Qc includes: When the heat pump system is running in both vibration defrosting mode and electric heating defrosting mode, if the evaporator coil temperature Tc is greater than or equal to the first end defrosting temperature Ts1, the refrigerant flow rate Vc in the evaporator is less than or equal to the end defrosting refrigerant flow rate Vs1, and the fan operating power Qc is less than or equal to the end defrosting power Qs, then the fourth continuous running time Ac4 of the compressor is detected. If the fourth continuous running time Ac4 is greater than or equal to the fourth preset time A4, the heat pump system will terminate the vibration defrosting mode and the electric heating defrosting mode.

[0014] In some embodiments, controlling the heat pump system to end defrosting based on the defrosting mode and based on the evaporator coil temperature Tc, the refrigerant flow rate Vc in the evaporator, and the outdoor fan operating power Qc further includes: When the heat pump system is running in both vibration defrosting mode and reverse defrosting mode, if the evaporator coil temperature Tc is greater than or equal to the second end defrosting temperature Ts2, Ts2 > Ts1, and the fan operating power Qc is less than or equal to the end defrosting power Qs, then the fifth continuous running time Ac5 of the compressor is detected. If the fifth continuous running time Ac5 is greater than or equal to the fifth preset time A5, and A5=A4, then the heat pump system will end the vibration defrosting mode and the reverse defrosting mode.

[0015] This disclosure also provides an apparatus for controlling the defrosting of a heat pump system, including a processor and a memory storing program instructions. The processor is configured to execute, when running the program instructions, a method for controlling the defrosting of a heat pump system as provided in any of the foregoing embodiments.

[0016] This disclosure also provides a heat pump system, including the apparatus for controlling defrosting of the heat pump system as provided in the foregoing embodiments.

[0017] This disclosure also provides a storage medium storing program instructions that, when executed, perform a method for controlling the defrosting of a heat pump system as provided in any of the foregoing embodiments.

[0018] The method and apparatus for controlling defrosting of a heat pump system, the heat pump system, and the storage medium provided in this disclosure can achieve the following technical effects: When the heat pump system is operating in heating mode and has reached a stable state, the evaporator coil temperature Tc, the refrigerant flow rate Vc in the evaporator, and the outdoor fan operating power Qc are detected. In this way, the parameters detected under this state can reflect the state of the heat pump system when the heating mode has reached a stable state. Then, defrosting control of the heat pump system based on the above parameters can make the defrosting control more precise. Furthermore, the evaporator coil temperature Tc, the refrigerant flow rate Vc in the evaporator, and the outdoor fan operating power Qc can more accurately reflect the frost situation of the evaporator. Controlling the defrosting of the heat pump system accordingly can further improve the accuracy of defrosting of the heat pump system, and the defrosting is clean and thorough.

[0019] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0020] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein: Figure 1 This is a block diagram of a heat pump system; Figure 2 This is a schematic diagram of a method for controlling defrosting of a heat pump system provided in an embodiment of this disclosure; Figure 3 This is a schematic diagram of another method for controlling defrosting of a heat pump system provided in an embodiment of this disclosure; Figure 4 This is a schematic diagram of another method for controlling defrosting of a heat pump system according to an embodiment of the present disclosure; Figure 5 This is a schematic diagram of another method for controlling defrosting of a heat pump system according to an embodiment of the present disclosure; Figure 6 This is a schematic diagram of another method for controlling defrosting of a heat pump system according to an embodiment of the present disclosure; Figure 7 This is a schematic diagram of another method for controlling defrosting of a heat pump system according to an embodiment of the present disclosure; Figure 8 This is a schematic diagram of another method for controlling defrosting of a heat pump system according to an embodiment of the present disclosure; Figure 9 This is a schematic diagram of a device for controlling the defrosting of a heat pump system according to an embodiment of this disclosure; Figure 10 This is a schematic diagram of another device for controlling the defrosting of a heat pump system provided in an embodiment of this disclosure. Detailed Implementation

[0021] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0022] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0023] Unless otherwise stated, the term "multiple" means two or more.

[0024] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0025] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0026] The term "correspondence" can refer to an association or binding relationship. The correspondence between A and B means that there is an association or binding relationship between A and B.

[0027] Combination Figure 1 As shown, a heat pump system includes a compressor, condenser, evaporator, expansion valve, and refrigerant piping. The compressor, condenser, evaporator, and expansion valve are connected by piping to form a circulation loop. The heat pump system enables the refrigerant to complete a thermodynamic cycle of evaporation, compression, condensation, throttling, and re-evaporation. The compressor compresses and transports the refrigerant from a low-temperature, low-pressure area to a high-temperature, high-pressure area; it is the heart of the heat pump (refrigeration) system. The evaporator is the device that outputs cooling capacity; its function is to evaporate the liquid refrigerant flowing in through the expansion valve to absorb heat from the object being cooled, thus achieving the purpose of cooling. The condenser is the device that outputs heat; the heat absorbed from the evaporator, along with the heat converted from the work consumed by the compressor, is carried away by the cooling medium in the condenser, achieving the purpose of heating. The expansion valve throttles and reduces the pressure of the refrigerant and regulates the flow rate of refrigerant entering the evaporator.

[0028] In a heat pump system, the condenser is located indoors and the evaporator is located outdoors. When operating in heating mode, the condenser releases heat indoors, while the evaporator absorbs heat outdoors. The heat pump system also includes an outdoor fan.

[0029] In any of the following disclosed embodiments, the parameter order is as follows: T3 < T2 < T1, V1 < V2 < V3, Q1 < Q2, A1 < A2 < A3 < A4 < A5.

[0030] Combination Figure 2 As shown, this disclosure provides a method for controlling defrosting of a heat pump system, comprising: S01, when the heat pump system is operating in heating mode and has reached a stable state, the control device detects the evaporator coil temperature Tc, the refrigerant flow rate Vc in the evaporator, and the outdoor fan operating power Qc.

[0031] S02, the control device controls the heat pump system to operate in defrost mode based on the evaporator coil temperature Tc, the refrigerant flow rate Vc in the evaporator and the fan operating power Qc of the outdoor fan.

[0032] In step S01, after the heat pump system starts heating mode, the parameters of each device, such as the evaporator coil temperature and the refrigerant flow rate in the evaporator, are still changing. At this time, if the control device starts to detect parameters and controls the heat pump system to defrost accordingly, the defrosting process may not be accurate enough, which will not only affect the defrosting effect, but also lead to unnecessary energy consumption.

[0033] Optionally, a set duration can be set, starting from the moment the heat pump system begins operating in heating mode. After the set duration is reached, the heat pump system is considered to have reached a stable state. Optionally, the set duration can be 5 minutes, 8 minutes, or 10 minutes, etc.

[0034] In step S02, there are several ways to detect the evaporator coil temperature Tc. In one way, the control device detects the evaporator coil temperature Tc through its built-in temperature sensor; in another way, the control device receives temperature data detected by a temperature sensor that can communicate wirelessly with it and uses it as the evaporator coil temperature Tc.

[0035] For detecting the refrigerant flow rate Vc inside the evaporator, the control device can receive the flow data detected by the flow sensor that can communicate wirelessly with it, and use it as the refrigerant flow rate Vc inside the evaporator.

[0036] To detect the operating power of outdoor fans, the control device can receive current data detected by a current sensor that can communicate wirelessly with it, and calculate the fan operating power based on the current data. The current sensor detects the current value flowing through the outdoor fan.

[0037] After the evaporator of a heat pump system frosts, the evaporator coil temperature, the refrigerant flow rate in the evaporator, and the operating power of the outdoor fan will change. By detecting these parameters, the degree of frost on the evaporator can be determined. Based on these parameters, the defrosting mode of the heat pump system can be controlled. In other words, controlling the defrosting mode of the heat pump system according to the degree of frost on the evaporator can improve the accuracy of defrosting control of the heat pump system.

[0038] The defrosting method for controlling a heat pump system provided in this embodiment detects the evaporator coil temperature Tc, the refrigerant flow rate Vc in the evaporator, and the outdoor fan operating power Qc when the heat pump system is operating in heating mode and has reached a stable state. The parameters detected under these conditions reflect the stable state of the heat pump system in heating mode. The control device then performs defrosting control on the heat pump system based on these parameters, resulting in more precise defrosting control. Furthermore, the evaporator coil temperature Tc, the refrigerant flow rate Vc in the evaporator, and the outdoor fan operating power Qc accurately reflect the frost condition of the evaporator, and controlling the defrosting of the heat pump system accordingly further improves the accuracy of the defrosting process.

[0039] Combination Figure 3 As shown in the embodiments of this disclosure, another method for controlling defrosting of a heat pump system is provided, including: S01, when the heat pump system is operating in heating mode and has reached a stable state, the control device detects the evaporator coil temperature Tc, the refrigerant flow rate Vc in the evaporator, and the outdoor fan operating power Qc.

[0040] S021, when the evaporator coil temperature Tc is less than or equal to the first preset temperature T1 or the refrigerant flow rate Vc in the evaporator is greater than or equal to the first preset flow rate V1, the control device detects the first continuous running time Ac1 of the compressor.

[0041] S022, the control device determines whether the first continuous running time Ac1 is greater than or equal to the first preset time A1. If yes, then step S023 is executed; if no, then step S024 is executed.

[0042] S023, The control device controls the heat pump system to start the vibration defrosting mode.

[0043] S024, the control device does not activate the vibration defrosting mode, and continues to monitor the evaporator coil temperature Tc, the refrigerant flow rate Vc in the evaporator, and the outdoor fan operating power Qc.

[0044] In step S021, when the evaporator coil temperature Tc is less than or equal to the first preset temperature T1, it indicates that the evaporator is in the initial stage of frosting, and water vapor begins to condense into water droplets on the evaporator surface. Optionally, 0℃ ≤ T1 < 1℃. For example, T1 = 0℃. In this case, the control device begins to detect the first continuous operating time Ac1 of the compressor.

[0045] Similarly, when the refrigerant flow rate Vc in the evaporator is greater than or equal to the first preset flow rate V1, it also indicates that the evaporator is in the initial stage of frosting, and water vapor begins to condense into water droplets on the evaporator surface, but no frost layer has formed. Optionally, 25g / s≤V1≤28g / s.

[0046] In step S021, the detection premise for the continuous running time of the compressor can be obtained by comparing the evaporator coil temperature Tc with the preset temperature, or by comparing the preset flow rate of refrigerant in the evaporator. Both of these can reflect the frosting trend of the evaporator.

[0047] In step S022, the control device determines whether the first continuous operating time Ac1 is greater than or equal to the first preset time A1. If yes, it means that the heat pump system has been running for a certain period of time in the initial stage of frosting, the phenomenon of water vapor condensing into water droplets on the evaporator surface is intensified, and the frosting trend is intensified, but no frost layer has formed. If no, it means that although the heat pump system is in the initial stage of frosting, the operating time is extremely short, the rate at which water vapor condenses into water droplets on the evaporator surface is slow, and the frosting trend has not yet intensified. Optionally, 60s ≤ A1 < 65s. For example, A1 = 60s.

[0048] In step S023, when the phenomenon of water vapor condensing into water droplets on the evaporator surface intensifies, and the tendency to frost increases, but a frost layer does not form, the control device controls the heat pump system to activate the vibration defrosting mode. Vibration effectively shakes off water droplets or ice crystals from the evaporator, thus slowing down the frosting process. Furthermore, the vibration defrosting mode consumes less energy than the electric heating defrosting mode and the reverse defrosting mode, and has less impact on the operation of the heat pump system.

[0049] In step S024, when the water vapor condenses into water droplets on the evaporator surface at a slow rate and the frosting trend has not yet intensified, the control device does not activate the vibration defrosting mode. The control device continues to monitor the evaporator coil temperature Tc, the refrigerant flow rate Vc in the evaporator, and the outdoor fan operating power Qc.

[0050] The method for controlling defrosting of a heat pump system provided in this disclosure can remove water droplets or ice crystals from the surface of the evaporator through a vibration defrosting mode when the evaporator is in the initial stage of frosting, thereby slowing down the frosting process of the evaporator. Furthermore, the method provided in this disclosure based on the vibration defrosting mode can perform defrosting with lower energy consumption.

[0051] Combination Figure 4 As shown in the embodiments of this disclosure, another method for controlling defrosting of a heat pump system is provided, including: S01, when the heat pump system is operating in heating mode and has reached a stable state, the control device detects the evaporator coil temperature Tc, the refrigerant flow rate Vc in the evaporator, and the outdoor fan operating power Qc.

[0052] S031, when the evaporator coil temperature Tc is greater than the third preset temperature T3 and less than or equal to the second preset temperature T2, T1>T2>T3, or when the refrigerant flow rate Vc in the evaporator is greater than or equal to the second preset flow rate V2 and less than the third preset flow rate V3, V1<V2<V3, and the fan operating power Qc is greater than or equal to the first preset power Q1 and less than the second preset power Q2, Q1<Q2, the control device detects the second continuous operating time Ac2 of the compressor.

[0053] S032, the control device determines whether the second continuous running time Ac2 is greater than or equal to the second preset time A2, where A2 > A1. If yes, then step S033 is executed; otherwise, step S034 is executed.

[0054] S033, the control device controls the heat pump system to operate simultaneously in vibration defrosting mode and electric heating defrosting mode.

[0055] S034, the control device does not activate the electric heating defrosting mode, and the control device continues to monitor the evaporator coil temperature Tc, the refrigerant flow rate Vc in the evaporator, and the outdoor fan operating power Qc.

[0056] In step S031, when the evaporator coil temperature Tc is greater than the third preset temperature T3 and less than or equal to the second preset temperature T2, and the fan operating power Qc is greater than or equal to the first preset power Q1 and less than the second preset power Q2, it indicates that the evaporator is in the middle stage of frosting and the thickness of the frost begins to increase. At this time, vibration defrosting can no longer meet the defrosting requirements.

[0057] Similarly, when the refrigerant flow rate Vc in the evaporator is greater than or equal to the second preset flow rate V2 and less than the third preset flow rate V3, and the fan operating power Qc is greater than or equal to the first preset power Q1 and less than the second preset power Q2, it also indicates that the evaporator is in the middle stage of frosting, and the thickness of the frost begins to increase. At this time, vibration defrosting can no longer meet the defrosting requirements. Optionally, V1, V2, and V3 are all taken within the range of 25g / s to 35g / s.

[0058] Optionally, 25 g / s ≤ V1 ≤ 28 g / s, 28 g / s < V2 ≤ 30 g / s, and 30 g / s < V3 ≤ 35 g / s. For example, V1 = 25 g / s, V2 = 30 g / s, and V3 = 35 g / s.

[0059] Optionally, -1℃ ≤ T2 < 0℃. For example, T2 = -1℃. Optionally, -3℃ ≤ T3 < 1℃. For example, T3 = -3℃.

[0060] In step S031, when the evaporator is considered to be in the middle stage of frosting, the continuous running time of the compressor is detected to further understand the degree of frosting on the evaporator.

[0061] Optionally, 145W ≤ Q1 ≤ 155W. For example, Q1 = 150W. Optionally, 155W < Q2 ≤ 165W. For example, Q2 = 160W.

[0062] In step S032, the control device determines whether the second continuous operating time Ac2 is greater than or equal to the second preset time A2, where A2 > A1. If yes, it means the heat pump system has been running for a relatively long time in the middle stage of frosting, and the frost layer formed on the evaporator surface is slightly thicker; if no, it means the heat pump system has been running for a relatively short time in the middle stage of frosting, and the frost layer formed on the evaporator surface is thinner, and also contains water droplets and ice crystals. Optionally, 65s ≤ A2 < 70s. For example, A2 = 65s.

[0063] In step S033, when the frost layer on the evaporator surface is slightly thick, the control device controls the heat pump system to simultaneously operate the vibration defrosting mode and the electric heating defrosting mode. The electric heating defrosting mode melts the slightly thick frost layer, while the vibration defrosting mode shakes off the frost, water droplets, and ice crystals, achieving a more thorough defrosting of the evaporator. Compared to using only the electric heating defrosting mode or the vibration defrosting mode, operating both modes simultaneously improves defrosting efficiency when the evaporator is in the middle stage of frosting.

[0064] In step S034, if no thick frost layer has formed on the evaporator surface, the control device does not activate the electric heating defrosting mode. The control device continues to monitor the evaporator coil temperature Tc, the refrigerant flow rate Vc within the evaporator, and the outdoor fan's operating power Qc. In this case, if the heat pump system meets the operating conditions for the vibration defrosting mode, the control device can control the heat pump system to operate in vibration defrosting mode.

[0065] The defrosting method for controlling a heat pump system provided in this disclosure can remove a slightly thicker layer of frost from the evaporator surface by means of vibration defrosting mode and electric heating defrosting mode when the evaporator is in the middle stage of frost formation, thereby improving defrosting efficiency.

[0066] Combination Figure 5 As shown in the embodiments of this disclosure, another method for controlling defrosting of a heat pump system is provided, including: S01, when the heat pump system is operating in heating mode and has reached a stable state, the control device detects the evaporator coil temperature Tc, the refrigerant flow rate Vc in the evaporator, and the outdoor fan operating power Qc.

[0067] S031, when the evaporator coil temperature Tc is greater than the third preset temperature T3 and less than or equal to the second preset temperature T2, T1>T2>T3, or when the refrigerant flow rate Vc in the evaporator is greater than or equal to the second preset flow rate V2 and less than the third preset flow rate V3, V1<V2<V3, and the fan operating power Qc is greater than or equal to the first preset power Q1 and less than the second preset power Q2, Q1<Q2, the control device detects the second continuous operating time Ac2 of the compressor.

[0068] S035, if the second continuous running time Ac2 is greater than or equal to the first preset time A1 and less than the second preset time A2, then A2 > A1, and the control device controls the heat pump system to only run in vibration defrosting mode.

[0069] In step S035, if the second continuous running time Ac2 is greater than or equal to the first preset time A1 and less than the second preset time A2, it means that the heat pump system has been running for a very short time in the middle stage of frosting, which may produce water droplets or ice crystals. At this time, the control device controls the heat pump system to run only in vibration mode to remove water droplets or ice crystals.

[0070] Combination Figure 6 As shown in the embodiments of this disclosure, another method for controlling defrosting of a heat pump system is provided, including: S01, when the heat pump system is operating in heating mode and has reached a stable state, the control device detects the evaporator coil temperature Tc, the refrigerant flow rate Vc in the evaporator, and the outdoor fan operating power Qc.

[0071] S041, when the evaporator coil temperature Tc is less than or equal to the third preset temperature T3, or the refrigerant flow rate Vc in the evaporator is greater than or equal to the third preset flow rate V3, and the fan operating power Qc is greater than or equal to the second preset power Q2, the control device detects the third continuous operating time Ac3 of the compressor.

[0072] S042, the control device determines whether the third continuous running time Ac3 of the compressor is greater than or equal to the third preset time A3. If yes, then step S043 is executed; if no, then step S044 is executed.

[0073] S043, the control device controls the heat pump system to operate simultaneously in vibration defrosting mode and reverse defrosting mode.

[0074] S044, the control device does not activate the reverse defrosting mode, and the control device continues to monitor the evaporator coil temperature Tc, the refrigerant flow rate Vc in the evaporator, and the outdoor fan operating power Qc.

[0075] In step S041, when the evaporator coil temperature Tc is less than or equal to the third preset temperature T3, and the fan operating power Qc is greater than or equal to the second preset power Q2, it indicates that the evaporator is in the late stage of frosting. In this stage, continuous compressor operation can cause the frost thickness to increase to a certain extent, and the frost layer is very strong. At this point, vibration defrosting and electric heating defrosting are no longer sufficient to meet the defrosting requirements. In this case, the control device starts detecting the third continuous operating time Ac3 of the compressor. Alternatively, the evaporator coil temperature Tc can be replaced by the refrigerant flow rate Vc in the evaporator. When the refrigerant flow rate Vc in the evaporator is greater than or equal to the third preset flow rate V3, it is considered that the evaporator is in the late stage of frosting.

[0076] In step S042, the control device determines whether the third continuous running time Ac3 of the compressor is greater than or equal to the third preset time A3. If yes, it means that the heat pump system has been running for a long time in the later stage of frosting, and the frost layer formed on the evaporator surface is thick and strong. If no, it means that the heat pump system has not been running for a very long time in the later stage of frosting, and the frost layer formed on the evaporator surface is slightly thick.

[0077] In step S043, when the frost layer on the evaporator surface is thick and strong, the control device controls the heat pump system to simultaneously operate in vibration defrosting mode and reverse defrosting mode, and controls the outdoor fan to reverse. In this way, the combination of vibration defrosting and reverse defrosting can melt the thick frost layer for defrosting, and improve defrosting efficiency.

[0078] In step S043, the outdoor fan can also be controlled to reverse. This heats the air inlet of the outdoor fan, allowing the heated air to be reused after the fan returns to forward rotation, improving defrosting efficiency and reducing energy consumption. In step S044, if the frost layer on the evaporator surface is slightly thick, the control device can remove the frost layer without activating the reverse defrosting mode. In this case, if the heat pump system meets the operating conditions for the vibration defrosting mode, the control device can control the heat pump system to operate in the vibration defrosting mode; if the heat pump system meets the operating conditions for simultaneously operating the electric heating defrosting mode and the vibration defrosting mode, the control device can control the heat pump system to operate in both modes simultaneously.

[0079] The defrosting method for controlling a heat pump system provided in this disclosure can remove a thicker layer of frost from the evaporator surface during the later stages of frost formation by using a vibration defrosting mode and a reverse defrosting mode, thereby improving defrosting efficiency.

[0080] Combination Figure 7 As shown in the embodiments of this disclosure, another method for controlling defrosting of a heat pump system is provided, including: S01, when the heat pump system is operating in heating mode and has reached a stable state, the control device detects the evaporator coil temperature Tc, the refrigerant flow rate Vc in the evaporator, and the outdoor fan operating power Qc.

[0081] S041, when the evaporator coil temperature Tc is less than or equal to the third preset temperature T3, or the refrigerant flow rate Vc in the evaporator is greater than or equal to the third preset flow rate V3, and the fan operating power Qc is greater than or equal to the second preset power Q2, the control device detects the third continuous operating time Ac3 of the compressor.

[0082] S045, if the third continuous running time Ac3 of the compressor is greater than or equal to the second preset time A2 and less than the third preset time A3, then the control device controls the heat pump system to run both the vibration defrosting mode and the electric heating defrosting mode simultaneously.

[0083] In step S045, if the compressor's third continuous operating time Ac3 is greater than or equal to the second preset time A2 and less than the third preset time A3, it indicates that the heat pump system has not run for a long time in the later stage of frosting, and the frost layer on the evaporator surface is slightly thick but not very thick. When the frost layer on the evaporator surface is slightly thick, the control device simultaneously operates the vibration defrosting mode and the electric heating defrosting mode to defrost the evaporator. Optionally, 65s < A3 ≤ 70s. For example, A3 = 70s.

[0084] The defrosting method for controlling a heat pump system provided in this disclosure can remove a slightly thicker layer of frost from the evaporator during the later stages of frost formation by using a vibration defrosting mode and an electric heating defrosting mode, thereby improving defrosting efficiency.

[0085] In some embodiments, after detecting the third continuous operating time Ac3 of the compressor, the method further includes: if the third continuous operating time Ac3 is greater than or equal to the first preset time A1 and less than the second preset time A2, the control device controls the heat pump system to operate only in vibration defrosting mode.

[0086] If the third continuous running time Ac3 is greater than or equal to the first preset time A1 and less than the second preset time A2, it indicates that the heat pump system runs for a very short time in the later stage of frosting. At this time, there are water droplets or ice crystals on the surface of the evaporator, and defrosting can be performed only by vibration defrosting mode.

[0087] Combination Figure 8 As shown in the embodiments of this disclosure, another method for controlling defrosting of a heat pump system is provided, including: S01, when the heat pump system is operating in heating mode and has reached a stable state, the control device detects the evaporator coil temperature Tc, the refrigerant flow rate Vc in the evaporator, and the outdoor fan operating power Qc.

[0088] S02, the control device controls the heat pump system to operate in defrost mode based on the evaporator coil temperature Tc, the refrigerant flow rate Vc in the evaporator and the fan operating power Qc of the outdoor fan.

[0089] S05, the control device controls the heat pump system to end defrosting based on the defrosting mode, evaporator coil temperature Tc, refrigerant flow rate Vc in the evaporator, and outdoor fan operating power Qc.

[0090] The defrosting method for controlling a heat pump system provided in this embodiment allows the control device to control the heat pump system to end defrosting after it has been controlled to operate in defrosting mode. This control is based on the evaporator coil temperature Tc, the refrigerant flow rate Vc in the evaporator, and the outdoor fan operating power Qc. Thus, the parameters detected in this state reflect the state of the heat pump system during defrosting. The control device then uses these parameters to further control the defrosting process, resulting in more precise defrosting control.

[0091] Optionally, the control device controls the heat pump system to end defrosting based on the defrosting mode, evaporator coil temperature Tc, refrigerant flow rate Vc in the evaporator, and outdoor fan operating power Qc, including: When the heat pump system is running in both vibration defrosting mode and electric defrosting mode, if the evaporator coil temperature Tc is greater than or equal to the first end defrosting temperature Ts1, the refrigerant flow rate Vc in the evaporator is less than or equal to Vs1, and the fan operating power Qc is less than or equal to Qs, then the control device detects the fourth continuous running time Ac4 of the compressor. If the fourth continuous running time Ac4 is greater than or equal to the fourth preset time A4, the control device controls the heat pump system to end the vibration defrosting mode and the electric heating defrosting mode.

[0092] In this embodiment of the present disclosure, when the heat pump system is operating in both vibration defrosting mode and electric defrosting mode, if the evaporator coil temperature Tc is greater than or equal to the first end defrosting temperature Ts1, the refrigerant flow rate Vc in the evaporator is less than or equal to Vs1, and the fan operating power Qc is less than or equal to Qs, and the compressor's fourth continuous operating time Ac4 is greater than or equal to the fourth preset time A4, then it is considered that the frost layer on the evaporator surface has been completely removed. At this time, the control device controls the heat pump system to end the vibration defrosting mode and the electric defrosting mode.

[0093] Optionally, Vs1=V2, Vs2=V1. Optionally, Qs=Q1. This facilitates accurate determination of when the heat pump system has finished defrosting.

[0094] The embodiments disclosed herein enable the heat pump system to simultaneously operate in vibration defrosting mode and electric heating defrosting mode, and to promptly terminate both modes after the evaporator has been completely defrosted, thereby saving energy.

[0095] Optionally, the control device controls the heat pump system to end defrosting based on the defrosting mode, evaporator coil temperature Tc, refrigerant flow rate Vc in the evaporator, and outdoor fan operating power Qc, and further includes: When the heat pump system is running in both vibration defrosting mode and reverse defrosting mode, if the evaporator coil temperature Tc is greater than or equal to the second end defrosting temperature Ts2, Ts2 > Ts1, and the fan operating power Qc is less than or equal to the end defrosting power Qs, then the control device detects the fifth continuous running time Ac5 of the compressor. If the fifth continuous running time Ac5 is greater than or equal to the fifth preset time A5, and A5=A4, then the control device controls the heat pump system to end the vibration defrosting mode and the reverse defrosting mode, and controls the outdoor fan to rotate forward.

[0096] In this embodiment of the present disclosure, when the heat pump system is operating in both vibration defrosting mode and reverse defrosting mode, if the evaporator coil temperature Tc is greater than or equal to the second end defrosting temperature Ts2, Ts2 > Ts1, and the fan operating power Qc is less than or equal to the end defrosting power Qs, and the compressor's fifth continuous operating time Ac5 is greater than or equal to the fifth preset time A5, then it is considered that the frost layer on the evaporator surface has been completely removed. At this time, the control device controls the heat pump system to end the vibration defrosting mode and the reverse defrosting mode.

[0097] In this embodiment of the disclosure, the fan is controlled to rotate forward to reuse the heated air, and the heat pump system continues to heat after stopping reverse defrosting and vibration defrosting.

[0098] Optionally, 10℃≤Ts1≤15℃. For example, Ts1=12℃. Optionally, Ts2>Ts1. Optionally, Ts2>Ts1 and △Ts=Ts2-Ts1, 1≤△Ts≤3. Optionally, A5=A4=200s.

[0099] The embodiments disclosed herein enable the simultaneous operation of vibration defrosting mode and reverse defrosting mode in the heat pump system, with the vibration defrosting mode and reverse defrosting mode ending promptly after the evaporator is completely defrosted, thereby saving energy.

[0100] This disclosure also provides an apparatus for controlling the defrosting of a heat pump system, including a processor and a memory storing program instructions. The processor is configured to execute, when running the program instructions, a method for controlling the defrosting of a heat pump system as provided in any of the foregoing embodiments.

[0101] This disclosure also provides a heat pump system, including a device for controlling defrosting of the heat pump system as provided in any of the foregoing embodiments.

[0102] This disclosure also provides a storage medium storing program instructions that, when executed, perform a method for controlling the defrosting of a heat pump system as provided in any of the foregoing embodiments.

[0103] Combination Figure 9 As shown, this embodiment of the present disclosure provides an apparatus for controlling the defrosting of a heat pump system, including a detection module 21 and a control module 22. The detection module 21 is configured to detect the evaporator coil temperature Tc, the refrigerant flow rate Vc in the evaporator, and the outdoor fan operating power Qc when the heat pump system is operating in heating mode and has reached a stable state. The control module 22 is configured to control the heat pump system to operate in defrosting mode based on the evaporator coil temperature Tc, the refrigerant flow rate Vc in the evaporator, and the outdoor fan operating power Qc.

[0104] Using the device for controlling the defrosting of a heat pump system provided in the embodiments of this disclosure is beneficial to improving the accuracy of defrosting the heat pump system.

[0105] Combination Figure 10 As shown, this disclosure provides an apparatus for controlling the defrosting of a heat pump system, including a processor 100 and a memory 101. Optionally, the apparatus may further include a communication interface 102 and a bus 103. The processor 100, communication interface 102, and memory 101 can communicate with each other via the bus 103. The communication interface 102 can be used for information transmission. The processor 100 can call logical instructions in the memory 101 to execute the method for controlling the defrosting of the heat pump system described in the above embodiment.

[0106] Furthermore, the logic instructions in the aforementioned memory 101 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium.

[0107] The memory 101, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as program instructions / modules corresponding to the methods in the embodiments of this disclosure. The processor 100 executes functional applications and data processing by running the program instructions / modules stored in the memory 101, that is, it implements the method for controlling the defrosting of the heat pump system in the above embodiments.

[0108] The memory 101 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created based on the use of the terminal device. Furthermore, the memory 101 may include high-speed random access memory and may also include non-volatile memory.

[0109] This disclosure provides a product (e.g., a computer, a mobile phone, etc.) that includes the above-described device for controlling the defrosting of a heat pump system.

[0110] The aforementioned storage medium can be a transient computer-readable storage medium or a non-transitory computer-readable storage medium.

[0111] The technical solutions of this disclosure can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes one or more 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 method described in this disclosure. The aforementioned storage medium can be a non-transitory storage medium, including: a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and other media capable of storing program code; it can also be a transient storage medium.

[0112] The foregoing description and accompanying drawings fully illustrate embodiments of this disclosure to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, procedural, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terminology used in this application is for describing embodiments only and is not intended to limit the claims. As used in the description of embodiments and claims, the singular forms “a,” “an,” and “the” are intended to equally include the plural forms unless the context clearly indicates otherwise. Similarly, the term “and / or” as used in this application means including one or more of the associated listed items and all possible combinations thereof. Additionally, when used in this application, the term "comprise" and its variations "comprises" and / or "comprising" refer to the presence of stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof. Without further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the process, method, or apparatus that includes said element. In this document, each embodiment may focus on the differences from other embodiments, and similar or identical parts between embodiments can be referred to mutually. For methods, products, etc., disclosed in the embodiments, if they correspond to the method section disclosed in the embodiments, the relevant parts can be referred to the description of the method section.

[0113] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the embodiments of this disclosure. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0114] The methods and products disclosed in the embodiments herein (including but not limited to devices and equipment) can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For instance, the division of units may be merely a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be electrical, mechanical, or other forms. 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 units can be selected to implement this embodiment according to actual needs. In addition, the functional units in the embodiments of this disclosure may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0115] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than that shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks may also occur in a different order than disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. Each block in a block diagram and / or flowchart, and combinations of blocks in a block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

Claims

1. A method for controlling defrosting in a heat pump system, characterized in that, include: When the heat pump system is operating in heating mode and has reached a stable state, the evaporator coil temperature Tc, the refrigerant flow rate Vc in the evaporator, and the outdoor fan operating power Qc are detected. The heat pump system is controlled to operate in defrost mode based on the evaporator coil temperature Tc, the refrigerant flow rate Vc in the evaporator, and the fan operating power Qc of the outdoor fan. The step of controlling the heat pump system to operate in defrost mode based on the evaporator coil temperature Tc, the refrigerant flow rate Vc in the evaporator, and the outdoor fan operating power Qc includes: When the evaporator coil temperature Tc is less than or equal to the first preset temperature T1 or the refrigerant flow rate Vc in the evaporator is greater than or equal to the first preset flow rate V1, the first continuous running time Ac1 of the compressor is detected. If the first continuous running time Ac1 is greater than or equal to the first preset time A1, then the heat pump system is controlled to start the vibration defrosting mode. When the evaporator coil temperature Tc is greater than the third preset temperature T3 and less than or equal to the second preset temperature T2, T1 > T2 > T3, or when the refrigerant flow rate Vc in the evaporator is greater than or equal to the second preset flow rate V2 and less than the third preset flow rate V3, V1 < V2 < V3, and when the fan operating power Qc is greater than or equal to the first preset power Q1 and less than the second preset power Q2, Q1 < Q2, the second continuous operating time Ac2 of the compressor is detected. If the second continuous running time Ac2 is greater than or equal to the second preset time A2, and A2 > A1, then the heat pump system is controlled to run both vibration defrosting mode and electric heating defrosting mode simultaneously.

2. The method according to claim 1, characterized in that, The method of controlling the heat pump system to operate in defrost mode based on the evaporator coil temperature Tc, the refrigerant flow rate Vc in the evaporator, and the fan operating power Qc of the outdoor fan further includes: When the evaporator coil temperature Tc is less than or equal to the third preset temperature T3, or the refrigerant flow rate Vc in the evaporator is greater than or equal to the third preset flow rate V3, and the fan operating power Qc is greater than or equal to the second preset power Q2, the third continuous operating time Ac3 of the compressor is detected. If the third continuous operating time Ac3 is greater than or equal to the third preset time A3, then the heat pump system is controlled to operate in both vibration defrosting mode and reverse defrosting mode simultaneously.

3. The method according to claim 2, characterized in that, If the third continuous operating time Ac3 is greater than or equal to the third preset time A3, the method further includes controlling the outdoor fan to reverse.

4. The method according to claim 2 or 3, characterized in that, After controlling the heat pump system to operate in defrost mode, the method further includes: The defrosting process of the heat pump system is controlled to end based on the defrosting mode, the evaporator coil temperature Tc, the refrigerant flow rate Vc in the evaporator, and the fan operating power Qc of the outdoor fan.

5. The method according to claim 4, characterized in that, The step of controlling the heat pump system to end defrosting based on the defrosting mode and based on the evaporator coil temperature Tc, the refrigerant flow rate Vc in the evaporator, and the outdoor fan operating power Qc includes: When the heat pump system is running in both vibration defrosting mode and electric heating defrosting mode, if the evaporator coil temperature Tc is greater than or equal to the first end defrosting temperature Ts1, and the refrigerant flow rate Vc in the evaporator is less than or equal to the end defrosting refrigerant flow rate Vs1, and the fan operating power Qc is less than or equal to the end defrosting power Qs, then the fourth continuous running time Ac4 of the compressor is detected. If the fourth continuous operating time Ac4 is greater than or equal to the fourth preset time A4, then the heat pump system is controlled to end the vibration defrosting mode and the electric heating defrosting mode.

6. The method according to claim 5, characterized in that, The method of controlling the heat pump system to end defrosting based on the defrosting mode and based on the evaporator coil temperature Tc, the refrigerant flow rate Vc in the evaporator, and the fan operating power Qc of the outdoor fan also includes: When the heat pump system is running in both vibration defrosting mode and reverse defrosting mode, if the evaporator coil temperature Tc is greater than or equal to the second end defrosting temperature Ts2, Ts2 > Ts1, and the fan operating power Qc is less than or equal to the end defrosting power Qs, then the fifth continuous running time Ac5 of the compressor is detected. If the fifth continuous running time Ac5 is greater than or equal to the fifth preset time A5, and A5=A4, then the heat pump system is controlled to end the vibration defrosting mode and the reverse defrosting mode.

7. A device for controlling defrosting of a heat pump system, comprising a processor and a memory storing program instructions, characterized in that, The processor is configured to, when executing the program instructions, perform the method for controlling defrosting of a heat pump system as described in any one of claims 1 to 6.

8. A heat pump system, characterized in that, Includes the device for controlling defrosting of a heat pump system as described in claim 7.

9. A storage medium storing program instructions, characterized in that, When the program instructions are executed, they perform the method for controlling the defrosting of a heat pump system as described in any one of claims 1 to 6.

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