Defrosting method and device of heat pump system

Abstract

The invention relates to the technical field of heat pump systems, and discloses a defrosting method and device for a heat pump system, a bypass pipe is arranged at the water outlet end of a water tank of the heat pump system, and the water outlet end of the bypass pipe faces an evaporator of the heat pump system; the bypass pipe is provided with a switch valve, and the method comprises the steps that under the condition that defrosting needs to be conducted on the evaporator, the set water amount needed by defrosting is set; the switch valve is controlled to be opened, hot water is sprayed to the evaporator through the bypass pipe, the actual water amount of the sprayed hot water is obtained, and whether the actual water amount reaches the set water amount or not is judged; under the condition that the actual water volume reaches the set water volume, whether the current evaporator temperature of the heat pump system is larger than or equal to the first preset temperature or not is judged; and under the condition that the current evaporator temperature is larger than or equal to the first preset temperature, the switch valve is controlled to be closed. Defrosting can be achieved under the condition that the hot water heating mode of the heat pump system is not stopped, the influence on the heating efficiency of the heat pump system can be reduced, the energy efficiency of the whole machine can be improved, and waste of water resources can be avoided.

Description

Technical Field

[0001] The invention relates to the technical field of heat pump systems, and in particular to a defrosting method and a defrosting device for a heat pump system. Background Art

[0002] When a heat pump system such as an air source heat pump water heater is in use, it works in a reverse Carnot cycle state, absorbing heat on its evaporator, causing the evaporator temperature to be lower than the ambient temperature. When the ambient humidity is high, the evaporator will be frosted, thereby clogging the evaporator fins, causing the evaporator to be unable to absorb heat, thereby causing the heat pump system to be inefficient or unable to work.

[0003] At present, the conventional defrosting method of the heat pump system is to use refrigerant for defrosting (refrigeration defrosting). For example, the heat pump system stops the current hot water heating mode, and then switches the four-way valve to convert the heat pump system from the reverse Carnot cycle to the Carnot cycle. At this time, the refrigerant is used to release heat on the evaporator to achieve the defrosting effect. However, the microchannel coil on the water tank will absorb heat, causing the water tank temperature to be low, resulting in a loss of heating energy efficiency for the entire machine. Summary of the invention

[0004] In view of this, the present invention provides a defrosting method and device for a heat pump system to solve the problem of affecting the heating energy efficiency when defrosting the heat pump system.

[0005] In a first aspect, the present invention provides a defrosting method for a heat pump system, wherein a bypass pipe is provided at a water outlet of a water tank of the heat pump system, and the water outlet of the bypass pipe faces an evaporator of the heat pump system; and a switch valve is provided on the bypass pipe;

[0006] The method comprises:

[0007] When the evaporator needs to be defrosted, a set amount of water required for defrosting is set;

[0008] Controlling the switch valve to open so as to spray hot water to the evaporator through the bypass pipe, obtaining the actual water volume of the sprayed hot water, and determining whether the actual water volume reaches the set water volume;

[0009] When the actual water volume reaches the set water volume, determining whether the current evaporator temperature of the heat pump system is greater than or equal to a first preset temperature;

[0010] When the current evaporator temperature is greater than or equal to a first preset temperature, the switch valve is controlled to be closed.

[0011] When defrosting is required, the present invention utilizes the fact that hot water is stored in the water tank of the heat pump system to spray hot water on the evaporator, thereby achieving the purpose of defrosting. This defrosting method has a simple structure and does not require switching of the circulation state. It can achieve defrosting without stopping the hot water heating mode of the heat pump system, which can reduce the impact on the heating efficiency of the heat pump system and is conducive to improving the energy efficiency of the whole machine. In addition, by setting the set water volume required for defrosting, quantitative defrosting is achieved to avoid wasting water resources as much as possible; and when the actual water volume reaches the set water volume, it is judged whether the current evaporator temperature reaches the required first preset temperature, so as to ensure the defrosting effect.

[0012] In an optional embodiment, the method further includes:

[0013] When the current evaporator temperature is lower than the first preset temperature, increasing the set water volume according to a preset increment;

[0014] The step of determining whether the actual water volume reaches the set water volume is performed again.

[0015] When the current evaporator temperature does not reach the desired first preset temperature, the present invention increases the set water volume, so that more hot water can be used to defrost the evaporator, and the defrosting of the evaporator is completed as much as possible, thereby ensuring the defrosting effect.

[0016] In an optional implementation, increasing the set water volume according to a preset increment includes:

[0017] Determine whether the current water replenishment times reaches the preset times;

[0018] If the water replenishment times do not reach the preset times, the set water volume is increased according to the preset increment, and the water replenishment times are increased according to the preset step length;

[0019] When the water replenishment times reaches a preset number, the switch valve is controlled to close.

[0020] When the current evaporator temperature does not exceed the first preset temperature, the present invention can replenish water by increasing the set water volume once or multiple times to ensure the defrosting effect; and set an upper limit on the number of replenishment times to avoid excessive water consumption and waste of water resources.

[0021] In an optional implementation, the setting of the water volume required for defrosting includes:

[0022] Determining the severity of frost on the evaporator and determining the water tank temperature;

[0023] The set water volume required for defrosting is set according to the severity and the water tank temperature; the severity indicates that the more severe the frosting is, the larger the set water volume is, and there is a negative correlation between the water tank temperature and the set water volume.

[0024] The present invention determines the set water volume based on the severity of evaporator frosting and the water tank temperature, and can set a suitable set water volume, while ensuring the defrosting effect, avoiding wasting water resources as much as possible and improving the utilization rate of water resources.

[0025] In an optional embodiment, the acquired initial evaporator temperature and the ambient temperature are used to indicate the severity of the evaporator frosting;

[0026] The step of setting the amount of water required for defrosting according to the severity and the water tank temperature includes:

[0027] The set water volume required for defrosting is set according to the initial evaporator temperature, the ambient temperature and the water tank temperature; there is a negative correlation between the initial evaporator temperature and the set water volume, and there is a negative correlation between the ambient temperature and the set water volume.

[0028] The present invention combines the initial evaporator temperature, the ambient temperature and the water tank temperature to simply and conveniently determine the appropriate set water volume without the need for complex processing logic.

[0029] In an optional embodiment, the water volume is set to:

[0030]

[0031] Among them, Fset represents the set water volume, T 蒸发器 represents the initial evaporator temperature, T 水箱 represents the water tank temperature, Fbase is the reference water volume corresponding to the ambient temperature, and there is a negative correlation between the reference water volume and the ambient temperature; a and b are both preset temperature values.

[0032] In an optional embodiment, the method further includes:

[0033] Get the initial evaporator temperature and ambient temperature;

[0034] When the initial evaporator temperature is less than or equal to the second preset temperature and the ambient temperature is less than or equal to the third preset temperature, it is determined that the evaporator needs to be defrosted.

[0035] The present invention utilizes the initial evaporator temperature and the ambient temperature to simply and conveniently determine whether the evaporator needs to be defrosted, and can achieve automatic defrosting without human intervention.

[0036] In an optional embodiment, the method further includes:

[0037] In the case where the evaporator needs to be defrosted, determining whether the water tank temperature is greater than or equal to a fourth preset temperature;

[0038] When the water tank temperature is greater than or equal to a fourth preset temperature, performing the step of setting the set water volume required for defrosting;

[0039] When the water tank temperature is lower than a fourth preset temperature, the evaporator is defrosted based on refrigerant defrosting or electric heating defrosting.

[0040] The present invention performs defrosting based on the hot water in the water tank when the temperature of the water tank reaches the fourth preset temperature, thereby ensuring the hot water defrosting effect and avoiding meaningless defrosting.

[0041] In an optional embodiment, the method further includes:

[0042] When the evaporator needs to be defrosted, the fan of the evaporator is turned off, and then the step of controlling the switch valve to open is performed;

[0043] When the current evaporator temperature is greater than or equal to a first preset temperature, after controlling the switch valve to close, the fan of the evaporator is turned on again.

[0044] When the evaporator is sprayed with hot water, the fan is temporarily turned off to prevent the fan from blowing hot water to other positions and affecting the defrosting effect; after the defrosting is completed, the fan is turned on again and the heat pump system can resume normal operation.

[0045] In a second aspect, the present invention provides a defrosting device for a heat pump system, wherein a bypass pipe is provided at a water outlet of a water tank of the heat pump system, and the water outlet of the bypass pipe faces an evaporator of the heat pump system; and a switch valve is provided on the bypass pipe;

[0046] The device comprises:

[0047] A setting module, used for setting a set amount of water required for defrosting when the evaporator needs to be defrosted;

[0048] a processing module, used for controlling the switch valve to open so as to spray hot water to the evaporator through the bypass pipe, obtaining an actual water volume of the sprayed hot water, and determining whether the actual water volume reaches a set water volume;

[0049] a judgment module, configured to judge whether a current evaporator temperature of the heat pump system is greater than or equal to a first preset temperature when the actual water volume reaches a set water volume;

[0050] The processing module is further configured to control the switch valve to close when the current evaporator temperature is greater than or equal to a first preset temperature.

[0051] In a third aspect, the present invention provides an electronic device comprising: a memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, and the processor executing the defrosting method of a heat pump system according to the first aspect or any corresponding embodiment thereof by executing the computer instructions.

[0052] In a fourth aspect, the present invention provides a computer-readable storage medium having computer instructions stored thereon, the computer instructions being used to enable a computer to execute the defrosting method for a heat pump system according to the first aspect or any corresponding embodiment thereof.

[0053] In a fifth aspect, the present invention provides a computer program product, comprising computer instructions for causing a computer to execute the defrosting method for a heat pump system according to the first aspect or any corresponding embodiment thereof.

[0054] When defrosting is required, the present invention utilizes the fact that hot water is stored in the water tank of the heat pump system to spray hot water on the evaporator, thereby achieving the purpose of defrosting. This defrosting method has a simple structure and does not require switching of the circulation state. It can achieve defrosting without stopping the hot water heating mode of the heat pump system, which can reduce the impact on the heating efficiency of the heat pump system and is conducive to improving the energy efficiency of the whole machine. In addition, by setting the set water volume required for defrosting, quantitative defrosting is achieved to avoid wasting water resources as much as possible; and when the actual water volume reaches the set water volume, it is judged whether the current evaporator temperature reaches the required first preset temperature, so as to ensure the defrosting effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the related technologies, the drawings required for use in the specific embodiments or the related technical descriptions will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0056] Figure 1 is a schematic diagram of a heat pump system according to an embodiment of the present invention;

[0057] Figure 2 is a schematic flow chart of a defrosting method for a heat pump system according to an embodiment of the present invention;

[0058] Figure 3 is a schematic flow chart of another defrosting method for a heat pump system according to an embodiment of the present invention;

[0059] Figure 4 is a schematic diagram of an electric control system of a heat pump system according to an embodiment of the present invention;

[0060] Figure 5 is a schematic diagram of a process for defrosting an evaporator according to an embodiment of the present invention;

[0061] Figure 6 is a structural block diagram of a defrosting device of a heat pump system according to an embodiment of the present invention;

[0062] Figure 7 It is a schematic diagram of the hardware structure of the electronic device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0063] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0064] In the description of this application, it should be understood that the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the feature. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0065] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0066] When the heat pump system needs to be defrosted, the conventional defrosting method using reverse cycle is easy to reduce the water tank temperature, and the system will shut down when the state is switched, which will also affect the heating efficiency of the heat pump system. Some solutions use physical defrosting methods, such as electric heating defrosting, but this solution consumes a lot of power.

[0067] According to an embodiment of the present invention, an embodiment of a defrosting method for a heat pump system is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0068] The embodiment of the present invention uses the hot water in the water tank of the heat pump system to achieve defrosting of the evaporator. Specifically, a bypass pipe is added at the hot water outlet end, and the bypass pipe is provided with a switch valve. The pressure of the water tank itself (such as the pressure of tap water) can be used to press the hot water in the water tank out of the water tank through the bypass pipe, and then spray it to the frosted evaporator to achieve defrosting of the evaporator. For example, the outlet end of the bypass pipe can be set at the top of the evaporator so that the hot water can flow evenly through the evaporator.

[0069] Figure 1 A schematic diagram of the heat pump system is shown. Among them, FAN represents a fan, HX1 represents a finned evaporator, EEV represents an electronic expansion valve, FL represents a filter, TT1 represents a temperature probe on the upper part of the water tank, MR represents a magnesium rod, EH represents electric heating, WP1 represents a water inlet pipe, EA represents an electronic anode, WP2 represents a water outlet pipe, HX2 represents a microchannel heat exchanger, CT represents a coil temperature probe, CM represents a compressor, SUT represents a return air temperature probe, ET represents an exhaust temperature probe, LP represents a low pressure switch, STF represents a four-way reversing valve, HP represents a high pressure switch, and AT represents an ambient temperature probe.

[0070] In this embodiment, Figure 1 As shown, a bypass pipe 101 is added at the water outlet of the water tank, and the bypass pipe 101 is provided with a switch valve 102. The water outlet of the bypass pipe 101 is arranged at the top of the fin evaporator HX1, and a water receiving tray 103 is arranged at the bottom of the fin evaporator HX1. The switch valve 102 is a controllable valve, for example, the switch valve 102 can be a solenoid valve.

[0071] When the fin evaporator HX1 needs to be defrosted, the switch valve 102 is controlled to open, so that hot water flows through the fin evaporator HX1 by tap water pressure, flushes the fins with hot water, melts the frost on the fin evaporator HX1, and finally discharges it through the drainage hole of the water receiving tray 103.

[0072] In this embodiment, a defrosting method for a heat pump system is provided, which can be applied to a controller of the heat pump system. In addition, a bypass pipe (such as Figure 1 The bypass pipe 101 shown in FIG. 1 is provided with a switch valve (such as Figure 1 The on-off valve 102 shown in the figure) and the water outlet end of the bypass pipe is directed toward the evaporator of the heat pump system (such as Figure 1 In the finned evaporator HX1 shown, for example, the water outlet end of the bypass pipe can be located at the top of the evaporator.

[0073] Figure 2 is a flow chart of a defrosting method for a heat pump system according to an embodiment of the present invention. Figure 2 As shown, the process includes the following steps.

[0074] Step S201, when the evaporator needs to be defrosted, the set water volume required for defrosting is set.

[0075] In this embodiment, as described above, during the operation of the heat pump system, if the ambient temperature is low, the evaporator may be frosted, and the evaporator needs to be defrosted. The user can set whether to defrost the evaporator, or the heat pump system can automatically detect whether the evaporator needs to be defrosted, which is not limited in this embodiment.

[0076] If the evaporator needs to be defrosted, the present embodiment uses the method of spraying the evaporator with hot water in the water tank for defrosting. In order to improve the utilization rate of hot water, the amount of water required for defrosting is preset, that is, the set water amount.

[0077] Step S202, control the switch valve to open to spray hot water to the evaporator through the bypass pipe, obtain the actual water volume of the sprayed hot water, and determine whether the actual water volume reaches the set water volume.

[0078] In this embodiment, when the evaporator needs to be defrosted, the switch valve is controlled to open so that the evaporator can be defrosted using the hot water in the water tank. Figure 1 As shown, the switch valve 102 can be controlled to open, so that the bypass pipe 101 can be used to spray hot water to the fin evaporator HX1, and the hot water can be used to melt the frost on the surface of the fin evaporator HX1, thereby achieving defrosting.

[0079] Among them, after the switch valve is opened, the actual amount of water sprayed to the evaporator, that is, the actual water amount, can be determined in real time, and it can be judged whether the actual water amount reaches the set water amount.

[0080] For example, a water flow sensor is provided at the bypass pipe 101 or the switch valve 102. Based on the water flow sensor, the actual amount of water discharged from the bypass pipe 101 can be determined in real time, and then the actual water amount can be compared with the set water amount, so as to determine whether the actual water amount reaches the set water amount.

[0081] Step S203: When the actual water volume reaches the set water volume, it is determined whether the current evaporator temperature of the heat pump system is greater than or equal to a first preset temperature.

[0082] In this embodiment, if the actual water volume reaches the set water volume, it means that the current hot water volume (i.e., the actual water volume) has basically reached the requirement for defrosting. At this time, the evaporator temperature of the heat pump system can be collected to obtain the current evaporator temperature at the current moment. The evaporator temperature can be the temperature of the evaporator coil, such as Figure 1 As shown, the coil temperature can be detected by the coil temperature probe CT and used as the evaporator temperature.

[0083] In addition, an evaporator threshold temperature, ie, a first preset temperature, is set to indicate whether there is no frost on the evaporator. Whether to end defrosting is determined by judging whether the current evaporator temperature of the heat pump system is greater than or equal to the first preset temperature.

[0084] Step S204: when the current evaporator temperature is greater than or equal to the first preset temperature, control the switch valve to close.

[0085] In this embodiment, if the current evaporator temperature is greater than or equal to the first preset temperature, it can be determined that the defrosting effect has been achieved after the evaporator is sprayed with the set amount of hot water. At this time, the defrosting can be ended, that is, the switch valve is controlled to be closed, and the bypass pipe no longer sprays hot water onto the outer surface of the evaporator.

[0086] For example, when the evaporator needs to be defrosted, the defrost mode can be entered and the switch valve can be controlled to open; when the actual water volume reaches the set water volume and the current evaporator temperature is greater than or equal to the first preset temperature, the defrost mode is exited and the switch valve is controlled to close.

[0087] The defrosting method of the heat pump system provided in this embodiment, when defrosting is needed, utilizes the fact that hot water is stored in the water tank of the heat pump system, sprays hot water on the evaporator, thereby achieving the purpose of defrosting. This defrosting method has a simple structure, does not require switching the circulation state, and can achieve defrosting without stopping the hot water heating mode of the heat pump system, which can reduce the impact on the heating efficiency of the heat pump system and is conducive to improving the energy efficiency of the whole machine. In addition, by setting the set water volume required for defrosting, quantitative defrosting is achieved to avoid wasting water resources as much as possible; and when the actual water volume reaches the set water volume, it is judged whether the current evaporator temperature reaches the required first preset temperature, which can ensure the defrosting effect.

[0088] In this embodiment, another defrosting method for a heat pump system is provided, which can be applied to a controller of a heat pump system. In addition, a bypass pipe (such as Figure 1 The bypass pipe 101 shown in FIG. 1 is provided with a switch valve (such as Figure 1 The on-off valve 102 shown in the figure) and the water outlet end of the bypass pipe is directed toward the evaporator of the heat pump system (such as Figure 1 In the finned evaporator HX1 shown, for example, the water outlet end of the bypass pipe can be located at the top of the evaporator. Figure 3 is a flow chart of a defrosting method for a heat pump system according to an embodiment of the present invention. Figure 3 As shown, the process includes the following steps.

[0089] Step S301, obtaining the initial evaporator temperature and the ambient temperature.

[0090] In this embodiment, during the operation of the heat pump system, the current evaporator temperature and ambient temperature can be obtained; for example, Figure 1 As shown, the evaporator temperature and the ambient temperature can be obtained based on the evaporator temperature probe CT and the ambient temperature probe AT, respectively. The evaporator temperature obtained at this time can be used to determine whether the evaporator needs to be defrosted. For the convenience of distinguishing descriptions, the evaporator temperature is referred to as the initial evaporator temperature.

[0091] Step S302: When the initial evaporator temperature is less than or equal to the second preset temperature and the ambient temperature is less than or equal to the third preset temperature, it is determined that the evaporator needs to be defrosted.

[0092] In this embodiment, the evaporator temperature threshold and the ambient temperature threshold indicating the need for defrosting are preset, that is, the second preset temperature and the third preset temperature. After the initial evaporator temperature and the ambient temperature are obtained, the difference between the initial evaporator temperature and the second preset temperature, and the difference between the ambient temperature and the third preset temperature can be compared. If the initial evaporator temperature is less than or equal to the second preset temperature, and the ambient temperature is less than or equal to the third preset temperature, it can be said that the current evaporator temperature and the ambient temperature are both low, and there is a high probability of frosting at this time, so it can be determined that the evaporator needs to be defrosted at this time.

[0093] In this embodiment, the initial evaporator temperature and the ambient temperature are used to simply and conveniently determine whether the evaporator needs to be defrosted, and automatic defrosting can be achieved without human intervention.

[0094] In some optional embodiments, if the evaporator needs to be defrosted, for example, based on the initial evaporator temperature and the ambient temperature, it is determined that the evaporator needs to be defrosted, then the subsequent step S303 can be directly continued to spray hot water to the evaporator. In which, it can be determined based on the water tank temperature whether it is currently suitable to use the hot water in the water tank for defrosting. Specifically, the method can also include the following steps A1 to A3.

[0095] Step A1, when the evaporator needs to be defrosted, determine whether the water tank temperature is greater than or equal to a fourth preset temperature.

[0096] Step A2, when the water tank temperature is greater than or equal to a fourth preset temperature, executing the step of setting the water volume required for defrosting.

[0097] Step A3: when the water tank temperature is lower than a fourth preset temperature, the evaporator is defrosted based on refrigerant defrosting or electric heating defrosting.

[0098] In this embodiment, if the evaporator needs to be defrosted, the current water tank temperature can be further obtained, and it can be determined whether the water tank temperature is greater than or equal to a fourth preset temperature. The fourth preset temperature is the lowest temperature of hot water that can be used for defrosting, for example, the fourth preset temperature is 20°C, 30°C, etc.

[0099] If the water tank temperature is greater than or equal to the fourth preset temperature, it means that the current water tank temperature meets the defrosting requirements, so defrosting can be performed by spraying hot water in the water tank, so the subsequent step S303 can be continued, that is, the step of setting the set water volume required for defrosting is executed.

[0100] On the contrary, if the water tank temperature is lower than the fourth preset temperature, it means that the water tank temperature is not high enough and the hot water inside is not enough for defrosting. Therefore, other defrosting methods are needed to defrost the evaporator. For example, the four-way valve of the heat pump system can be switched (such as Figure 1 The four-way reversing valve STF shown in the figure converts the heat pump system from a reverse Carnot cycle to a Carnot cycle, and defrosts by using a refrigerant defrost method, or by using an electric heating defrost method, which is not limited in this embodiment.

[0101] In this embodiment, when the temperature of the water tank reaches the fourth preset temperature, defrosting is performed based on the hot water in the water tank, which can ensure the hot water defrosting effect and avoid meaningless defrosting.

[0102] Step S303: When the evaporator needs to be defrosted, the amount of water required for defrosting is set.

[0103] In some optional implementations, the above step S303 "setting the set water volume required for defrosting" may include steps A1 to A2.

[0104] Step A1, determine the severity of evaporator frosting and determine the water tank temperature.

[0105] Step A2, setting the set water volume required for defrosting according to the severity and the water tank temperature; the severity means that the more severe the frosting is, the larger the set water volume is, and there is a negative correlation between the water tank temperature and the set water volume.

[0106] In this embodiment, when the evaporator needs to be defrosted, the set water volume can be determined according to the severity of the frost on the evaporator. The severity indicates that the more severe the frost is, the more hot water is required for defrosting, so the set water volume is larger. In addition, the set water volume can also be determined based on the water tank temperature, and there is a negative correlation between the water tank temperature and the set water volume, that is, the higher the water tank temperature, that is, the higher the temperature of the hot water in the water tank, the better the effect of using the hot water for defrosting, so the less hot water is required, that is, the smaller the set water volume can be.

[0107] The set water volume is determined based on the severity of evaporator frosting and the water tank temperature. The appropriate set water volume can be set to ensure the defrosting effect while avoiding water waste and improving the utilization rate of water resources.

[0108] Optionally, the acquired initial evaporator temperature and ambient temperature are used to indicate the severity of evaporator frosting; for example, when it is determined that the evaporator needs to be defrosted at present based on the acquired initial evaporator temperature and ambient temperature, the acquired initial evaporator temperature and ambient temperature can also be used to indicate the severity of evaporator frosting, and the set quantity is subsequently determined based on the initial evaporator temperature and ambient temperature.

[0109] Specifically, the above-mentioned step A2 "setting the set water volume required for defrosting according to the severity and the water tank temperature" may include: setting the set water volume required for defrosting according to the initial evaporator temperature, the ambient temperature and the water tank temperature; there is a negative correlation between the initial evaporator temperature and the set water volume, and there is a negative correlation between the ambient temperature and the set water volume.

[0110] In this embodiment, there is a negative correlation between the initial evaporator temperature and the set water volume, and there is a negative correlation between the ambient temperature and the set water volume, that is, the lower the initial evaporator temperature or the lower the ambient temperature, the more serious the evaporator frosting problem is at this time, so the more hot water is required for defrosting, the larger the set water volume is. Combining the initial evaporator temperature, the ambient temperature and the water tank temperature, the appropriate set water volume can be determined simply and conveniently without complex processing logic.

[0111] Optionally, the set water volume is:

[0112]

[0113] Among them, Fset represents the set water volume, T 蒸发器 represents the initial evaporator temperature, T 水箱 represents the water tank temperature, Fbase is the reference water volume corresponding to the ambient temperature, and there is a negative correlation between the reference water volume and the ambient temperature; a and b are both preset temperature values.

[0114] In this embodiment, the corresponding relationship between the ambient temperature and the reference water volume Fbase can be determined in advance. For example, when the ambient temperature is -5°C, the reference water volume Fbase is 10L; and there is a negative correlation between the reference water volume Fbase and the ambient temperature, that is, the lower the ambient temperature, the larger the reference water volume Fbase.

[0115] In addition, two temperature values ​​a and b are pre-set for calculating the set water volume Fset, wherein temperature value a is the desired temperature of the evaporator, for example, the temperature value a may be the above-mentioned first preset temperature; and temperature value b is not higher than the lowest temperature of the water tank, for example, the temperature value b is the above-mentioned fourth preset temperature.

[0116] For example, if the temperature values ​​a and b are both set to 20°C, the above formula can be specifically

[0117] When the evaporator needs to be defrosted, the corresponding reference water volume Fbase can be determined based on the ambient temperature, and the initial evaporator temperature T 蒸发器 and the water tank temperature T 水箱 Substituting the above formula, the amount of hot water required for defrosting can be calculated, that is, the set water volume Fset. Based on the above formula, it can be seen that the initial evaporator temperature, ambient temperature and water tank temperature are all negatively correlated with the set water volume.

[0118] Step S304, control the switch valve to open to spray hot water to the evaporator through the bypass pipe, obtain the actual water volume of the sprayed hot water, and determine whether the actual water volume reaches the set water volume.

[0119] For details, please see Figure 1 Step S202 of the illustrated embodiment will not be described in detail here.

[0120] Step S305: when the actual water volume reaches the set water volume, it is determined whether the current evaporator temperature of the heat pump system is greater than or equal to the first preset temperature.

[0121] For details, please see Figure 1 Step S203 of the illustrated embodiment will not be described in detail here.

[0122] Step S306: When the current evaporator temperature is greater than or equal to the first preset temperature, the switch valve is controlled to close.

[0123] For details, please see Figure 1 Step S204 of the illustrated embodiment will not be described in detail here.

[0124] Step S307: when the current evaporator temperature is lower than the first preset temperature, the set water volume is increased according to a preset increment.

[0125] And, if Figure 3 As shown, after resetting the set water volume, the step of determining whether the actual water volume has reached the set water volume is executed again, that is, the process of step S304 "determining whether the actual water volume has reached the set water volume" is re-executed. It can be understood that the set water volume targeted in the judgment process at this time is the increased set water volume.

[0126] In this embodiment, if the current evaporator temperature does not reach the desired first preset temperature after using the set water volume for defrosting, it means that the evaporator still has a certain frosting problem at this time, so the set water volume can be increased, so that more hot water can be used to defrost the evaporator, and the defrosting of the evaporator can be completed as much as possible to ensure the defrosting effect; for example, after using more hot water for defrosting, if the current evaporator temperature is greater than or equal to the first preset temperature, the switch valve can be controlled to close as shown in step S306 to end the defrosting.

[0127] The set water volume can be increased according to a certain preset increment, and the preset increment is the amount of hot water used additionally. For example, the preset increment is set to 1L; when the evaporator needs to be defrosted, the set water volume Fset required for defrosting can be set according to the initial evaporator temperature, ambient temperature, and water tank temperature, for example, Fset = 10L. If the evaporator temperature has not reached the first preset temperature after 10L of hot water is sprayed on the evaporator, the preset increment of 1L is added to the set water volume Fset, and the set amount is updated to 11L, that is, Fset = 11L at this time, and 1L of hot water is sprayed on the evaporator (accumulated 11L) at this time, so that the evaporator temperature reaches the first preset temperature as much as possible to ensure the defrosting effect.

[0128] In some optional implementations, the above step S307 "increase the set water volume according to a preset increment" includes steps C1 to C3.

[0129] Step C1, determining whether the current water replenishment times reaches a preset number.

[0130] Step C2, when the water replenishment times do not reach the preset times, increase the set water volume according to the preset increment, and increase the water replenishment times according to the preset step length.

[0131] Step C3, when the water replenishment times reaches a preset number, the switch valve is controlled to close.

[0132] In this embodiment, each time the set amount is increased, water replenishment is performed. To avoid waste, a threshold of the number of water replenishments allowed, i.e., a preset number of times, is also preset. When the current evaporator temperature is less than the first preset temperature, it is further determined whether the current number of water replenishments reaches the preset number of times.

[0133] If the water replenishment times have not reached the preset times, it means that water replenishment is still allowed, so the set water volume can be increased according to the preset increment, that is, the above step S307 is repeatedly executed. In addition, the water replenishment times are also increased according to the preset step length, so that it can be determined whether water replenishment is still allowed next time. The preset step length can be 1, for example, that is, the water replenishment times are increased by one.

[0134] On the contrary, if the water replenishment times reaches the preset times, it means that the upper limit of the water replenishment allowed has been reached, so no more water replenishment is performed at this time, and the switch valve is controlled to close, and defrosting ends. Since the current evaporator temperature is lower than the first preset temperature, it means that defrosting has not been successful at this time, and other defrosting methods can be further used for defrosting, or an alarm message can be issued to remind the user to handle it.

[0135] In this embodiment, if the current evaporator temperature is lower than the first preset temperature, water can be replenished by increasing the set water volume once or multiple times to ensure the defrosting effect; and an upper limit on the number of replenishment times is set to avoid excessive water consumption and waste of water resources.

[0136] Optionally, the method further includes step D1 to step D2.

[0137] Step D1, when the evaporator needs to be defrosted, the fan of the evaporator is turned off, and then the step of controlling the switch valve to open is performed.

[0138] Step D2, when the current evaporator temperature is greater than or equal to the first preset temperature, after controlling the switch valve to close, reopening the evaporator fan.

[0139] In this embodiment, a fan is provided at the evaporator. Figure 1 As shown, a fan FAN is provided at the fin evaporator HX1. When spraying hot water on the evaporator, in order to avoid fan interference, the fan can be temporarily turned off to prevent the fan from blowing hot water to other locations and affecting the defrosting effect; specifically, the fan of the evaporator is turned off first, and then the "control switch valve to open" in the above step S304 is executed. Accordingly, after the defrosting is completed, after the "control switch valve to close" in the above step S306, the fan is turned on again, and the heat pump system can resume normal operation.

[0140] Among them, the evaporator generally has only the front and back sides connected to the outside, and the left and right, top and bottom are all closed structures, which can effectively prevent hot water from flowing out or splashing when spraying hot water.

[0141] Figure 4 Figure 2 shows a schematic diagram of an electrical control system for a heat pump system. Figure 4 As shown, the controller of the heat pump system can obtain the water tank temperature, evaporator temperature, ambient temperature, etc., and the bypass pipe is also provided with a water flow sensor. Based on the water flow sensor, the controller can determine the amount of water flowing through the bypass pipe, that is, the current actual water volume, and control the opening and closing of the switch valve based on whether the actual water volume reaches the set water volume, etc.

[0142] Figure 5 A schematic diagram of a process for defrosting the evaporator is shown, which can be implemented by a controller, such as Figure 5As shown, the process includes the following steps.

[0143] Real-time detection of ambient temperature T 环境 Is it less than or equal to the third preset temperature? Figure 5 Take the third preset temperature of -5°C as an example. 环境 is less than or equal to the third preset temperature, then further determine the evaporator temperature T at this time 蒸发器 (i.e. the initial evaporator temperature) is less than or equal to the second preset temperature, Figure 5 Take the third preset temperature as -10°C as an example. 蒸发器 If the temperature is less than or equal to the second preset temperature, it can be determined that the evaporator has a frosting problem and needs to be defrosted, so the defrost mode is entered.

[0144] Determine the water tank temperature T 水箱 Whether it exceeds the fourth preset temperature, Figure 5 Take the fourth preset temperature of 20°C as an example. 水箱 ≥ the fourth preset temperature, hot water can be used for defrosting, otherwise the four-way valve is switched to convert the heat pump system from a reverse Carnot cycle to a Carnot cycle, and enter the refrigeration defrost (refrigerant defrost) process, which is not described in detail in this embodiment.

[0145] At the water tank temperature T 水箱 When the temperature is greater than or equal to the fourth preset temperature, the set water volume Fset is calculated, the fan is turned off, and the switch valve is opened. In addition, the water flow data is obtained based on the water flow sensor to determine the current actual water volume Flow.

[0146] Real-time judgment is made on whether the actual water volume Flow reaches the set water volume Fset, that is, judgment Flow≥Fset. If Flow≥Fset, the actual water volume Flow reaches the set water volume Fset, and the current evaporator temperature T is further judged. 蒸发器 (i.e., the current evaporator temperature) exceeds the first preset temperature, Figure 5 For example, the first preset temperature is 20°C.

[0147] If T 蒸发器 ≥ the first preset temperature, it means that defrosting is completed at this time, so close the switch valve, turn on the fan, exit the defrost mode, and the process ends. 蒸发器 <First preset temperature, such as Figure 5 As shown, the set water volume Fset is updated in an increasing manner, and a preset increment is added thereto. Figure 5 The preset increment is taken as 1L as an example.

[0148] In addition, the water replenishment times are incremented by one, and it is determined whether the water replenishment times have reached a preset number. Figure 5Taking the preset number of times as 3 as an example, the initial value of the water replenishment times can be 0. If the water replenishment times do not reach the preset times, it can continue to determine whether the actual water volume Flow reaches the set water volume Fset. At this time, the set water volume Fset is the water volume after the preset increment is increased. Repeat this process until T 蒸发器 ≥ the first preset temperature (for example, 20° C.), or, the number of water replenishment times ≥ the preset number of times (for example, 3).

[0149] Among them, if after water replenishment, T 蒸发器 ≥ the first preset temperature, it is still determined that defrosting is completed, that is, the switch valve is closed, the fan is turned on, and the defrost mode is exited. If the water replenishment times ≥ the preset times, it means that the hot water defrosting effect is average at this time, so a defrost fault can be reported, and the switch valve is also closed to avoid water waste, or the fan can be turned on, and the heat pump system continues to work, or, when a defrost fault is reported, the heat pump system is controlled to stop working, which is based on the actual settings.

[0150] For example, the initial set water volume Fset = 10 L. During hot water defrosting, the actual water volume Flow is detected by the water flow sensor. When the actual water volume Flow reaches 10 L and the evaporator temperature is greater than 20° C., the switch valve is closed to end the defrosting.

[0151] If the actual water volume Flow reaches 10L and the evaporator temperature is less than 20℃, the set water volume Fset will be increased by 1L, that is, the set water volume Fset is 11L at this time, and the switch valve will continue to be kept open; when the actual water volume Flow reaches 11L (accumulated water volume, that is, 1L of water is sprayed to the evaporator), the evaporator temperature is determined again. If the evaporator temperature is greater than 20℃, the switch valve is immediately closed; if the actual water volume Flow reaches 11L and the evaporator temperature is still less than 20℃, the set water volume Fset will be increased by 1L again, that is, the set water volume Fset is 12L at this time, and the switch valve will continue to be kept open, and so on.

[0152] If the actual water volume Flow reaches 13L, the evaporator temperature is still less than 20℃, because the water replenishment times have reached 3 times, a defrost fault is reported and the defrost is terminated.

[0153] The defrosting method of the heat pump system provided in this embodiment adds a bypass pipe at the hot water outlet of the water tank, and adds a switch valve and a water flow sensor. The hot water can be pressed out of the water tank by the pressure of the tap water. The structure is simple and does not affect the normal operation of the heat pump system. The actual water volume can be determined based on the water flow sensor and compared with the set water volume to achieve quantitative defrosting and avoid wasting water resources as much as possible. If the current evaporator temperature does not exceed the first preset temperature, water can be replenished by increasing the set water volume once or multiple times to ensure the defrosting effect; and an upper limit of the number of replenishment times is set to avoid excessive water consumption and waste of water resources.

[0154] In this embodiment, a defrosting device for a heat pump system is also provided, which is used to implement the above-mentioned embodiments and preferred implementation modes, and the descriptions that have been made will not be repeated. As used below, the term "module" may be a combination of software and / or hardware that implements a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0155] This embodiment provides a defrosting device for a heat pump system, wherein a bypass pipe is provided at the water outlet of a water tank of the heat pump system, and the water outlet of the bypass pipe faces the evaporator of the heat pump system; the bypass pipe is provided with a switch valve; Figure 6 As shown, the device comprises:

[0156] The setting module 601 is used to set the set water volume required for defrosting when the evaporator needs to be defrosted;

[0157] The processing module 602 is used to control the switch valve to open so as to spray hot water to the evaporator through the bypass pipe, obtain the actual water volume of the sprayed hot water, and determine whether the actual water volume reaches the set water volume;

[0158] A judgment module 603 is used to judge whether the current evaporator temperature of the heat pump system is greater than or equal to a first preset temperature when the actual water volume reaches the set water volume;

[0159] The processing module 602 is further configured to control the switch valve to close when the current evaporator temperature is greater than or equal to a first preset temperature.

[0160] In an optional implementation, the processing module 602 is further configured to:

[0161] When the current evaporator temperature is lower than the first preset temperature, increasing the set water volume according to a preset increment;

[0162] The step of determining whether the actual water volume reaches the set water volume is performed again.

[0163] In an optional implementation, the processing module 602 increases the set water volume according to a preset increment, including:

[0164] Determine whether the current water replenishment times reaches the preset times;

[0165] If the water replenishment times do not reach the preset times, the set water volume is increased according to the preset increment, and the water replenishment times are increased according to the preset step length;

[0166] When the water replenishment times reaches a preset number, the switch valve is controlled to close.

[0167] In an optional implementation, the setting module 601 sets the set water volume required for defrosting, including:

[0168] Determining the severity of frost on the evaporator and determining the water tank temperature;

[0169] The set water volume required for defrosting is set according to the severity and the water tank temperature; the severity indicates that the more severe the frosting is, the larger the set water volume is, and there is a negative correlation between the water tank temperature and the set water volume.

[0170] In an optional embodiment, the acquired initial evaporator temperature and the ambient temperature are used to indicate the severity of the evaporator frosting;

[0171] The setting module 601 sets the set water volume required for defrosting according to the severity and the water tank temperature, including:

[0172] The set water volume required for defrosting is set according to the initial evaporator temperature, the ambient temperature and the water tank temperature; there is a negative correlation between the initial evaporator temperature and the set water volume, and there is a negative correlation between the ambient temperature and the set water volume.

[0173] In an optional embodiment, the water volume is set to:

[0174]

[0175] Among them, Fset represents the set water volume, T 蒸发器 represents the initial evaporator temperature, T 水箱 represents the water tank temperature, Fbase is the reference water volume corresponding to the ambient temperature, and there is a negative correlation between the reference water volume and the ambient temperature; a and b are both preset temperature values.

[0176] In an optional implementation, the processing module 602 is further configured to:

[0177] Get the initial evaporator temperature and ambient temperature;

[0178] When the initial evaporator temperature is less than or equal to the second preset temperature and the ambient temperature is less than or equal to the third preset temperature, it is determined that the evaporator needs to be defrosted.

[0179] In an optional implementation, the processing module 602 is further configured to:

[0180] In the case where the evaporator needs to be defrosted, determining whether the water tank temperature is greater than or equal to a fourth preset temperature;

[0181] When the water tank temperature is greater than or equal to a fourth preset temperature, performing the step of setting the set water volume required for defrosting;

[0182] When the water tank temperature is lower than a fourth preset temperature, the evaporator is defrosted based on refrigerant defrosting or electric heating defrosting.

[0183] In an optional implementation, the processing module 602 is further configured to:

[0184] When the evaporator needs to be defrosted, the fan of the evaporator is turned off, and then the step of controlling the switch valve to open is performed;

[0185] When the current evaporator temperature is greater than or equal to a first preset temperature, after controlling the switch valve to close, the fan of the evaporator is turned on again.

[0186] The further functional description of each of the above modules and units is the same as that of the above corresponding embodiments and will not be repeated here.

[0187] The defrost device of the heat pump system in this embodiment is presented in the form of a functional unit, where the unit refers to an ASIC (Application Specific Integrated Circuit) circuit, including a processor and memory that executes one or more software or fixed programs, and / or other devices that can provide the above functions.

[0188] The embodiment of the present invention also provides an electronic device having the above Figure 6 The defrosting device of the heat pump system shown. The electronic device may specifically be a heat pump system controller.

[0189] See also Figure 7 , Figure 7 is a schematic diagram of the structure of an electronic device provided by an optional embodiment of the present invention, such as Figure 7 As shown, the electronic device includes: one or more processors 10, a memory 20, and interfaces for connecting various components, including high-speed interfaces and low-speed interfaces. The various components are connected to each other using different buses for communication, and can be installed on a common mainboard or installed in other ways as needed. The processor can process instructions executed in the electronic device, including instructions stored in or on the memory to display graphical information of the GUI on an external input / output device (such as a display device coupled to the interface). In some optional embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories. Similarly, multiple electronic devices can be connected, and each device provides some necessary operations (for example, as a server array, a group of blade servers, or a multi-processor system). Figure 7 A processor 10 is taken as an example.

[0190] The processor 10 may be a central processing unit, a network processor or a combination thereof. The processor 10 may further include a hardware chip. The hardware chip may be a dedicated integrated circuit, a programmable logic device or a combination thereof. The programmable logic device may be a complex programmable logic device, a field programmable gate array, a general purpose array logic or any combination thereof.

[0191] The memory 20 stores instructions executable by at least one processor 10, so that the at least one processor 10 executes the method shown in the above embodiment.

[0192] The memory 20 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function; the data storage area may store data created according to the use of the electronic device, etc. In addition, the memory 20 may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some optional embodiments, the memory 20 may optionally include a memory remotely arranged relative to the processor 10, and these remote memories may be connected to the electronic device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0193] The memory 20 may include a volatile memory, such as a random access memory; the memory may also include a non-volatile memory, such as a flash memory, a hard disk or a solid state drive; the memory 20 may also include a combination of the above types of memory.

[0194] The electronic device further comprises a communication interface 30 for the electronic device to communicate with other devices or a communication network.

[0195] The embodiment of the present invention also provides a computer-readable storage medium. The method according to the embodiment of the present invention can be implemented in hardware, firmware, or can be implemented as a computer code that can be recorded in a storage medium, or can be implemented as a computer code that is originally stored in a remote storage medium or a non-temporary machine-readable storage medium and will be stored in a local storage medium through a network download, so that the method described herein can be stored in such software processing on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only storage memory, a random access memory, a flash memory, a hard disk or a solid-state hard disk, etc.; further, the storage medium can also include a combination of the above types of memories. It can be understood that a computer, a processor, a microprocessor controller, or programmable hardware includes a storage component that can store or receive software or computer code. When the software or computer code is accessed and executed by a computer, a processor, or hardware, the method shown in the above embodiment is implemented.

[0196] A part of the present invention may be applied as a computer program product, such as a computer program instruction, which, when executed by a computer, can call or provide the method and / or technical solution according to the present invention through the operation of the computer. Those skilled in the art should understand that the existence of the computer program instruction in a computer-readable medium includes, but is not limited to, a source file, an executable file, an installation package file, etc., and accordingly, the way in which the computer program instruction is executed by the computer includes, but is not limited to: the computer directly executes the instruction, or the computer compiles the instruction and then executes the corresponding compiled program, or the computer reads and executes the instruction, or the computer reads and installs the instruction and then executes the corresponding installed program. Here, the computer-readable medium may be any available computer-readable storage medium or communication medium accessible to the computer.

[0197] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0198] The specific contents of the above specific embodiments only express several embodiments of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A defrosting method for a heat pump system, characterized in that: A bypass pipe is provided at the water outlet of the water tank of the heat pump system, and the water outlet of the bypass pipe faces the evaporator of the heat pump system; The bypass pipe is provided with a switch valve; The method comprises: When the evaporator needs to be defrosted, a set amount of water required for defrosting is set; Controlling the switch valve to open so as to spray hot water to the evaporator through the bypass pipe, obtaining the actual water volume of the sprayed hot water, and determining whether the actual water volume reaches the set water volume; When the actual water volume reaches the set water volume, determining whether the current evaporator temperature of the heat pump system is greater than or equal to a first preset temperature; When the current evaporator temperature is greater than or equal to the first preset temperature, the switch valve is controlled to be closed.

2. The method according to claim 1, characterized in that Also includes: When the current evaporator temperature is lower than the first preset temperature, increasing the set water volume according to a preset increment; The step of determining whether the actual water volume reaches the set water volume is performed again.

3. The method according to claim 2, characterized in that The step of increasing the set water volume according to a preset increment comprises: Determine whether the current water replenishment times reaches the preset times; If the water replenishment times do not reach the preset times, the set water volume is increased according to the preset increment, and the water replenishment times are increased according to the preset step length; When the water replenishment times reaches a preset number, the switch valve is controlled to close.

4. The method according to claim 1, characterized in that: The set water volume required for setting defrosting includes: Determining the severity of frost on the evaporator and determining the water tank temperature; The set water volume required for defrosting is set according to the severity and the water tank temperature; the severity indicates that the more severe the frosting is, the larger the set water volume is, and there is a negative correlation between the water tank temperature and the set water volume.

5. The method according to claim 4, characterized in that The acquired initial evaporator temperature and the ambient temperature indicate the severity of the frost on the evaporator; The step of setting the amount of water required for defrosting according to the severity and the water tank temperature includes: The set water volume required for defrosting is set according to the initial evaporator temperature, the ambient temperature and the water tank temperature; there is a negative correlation between the initial evaporator temperature and the set water volume, and there is a negative correlation between the ambient temperature and the set water volume.

6. The method according to claim 5, characterized in that Set the water volume to: Among them, Fset represents the set water volume, T 蒸发器 represents the initial evaporator temperature, T 水箱 represents the water tank temperature, Fbase is the reference water volume corresponding to the ambient temperature, and there is a negative correlation between the reference water volume and the ambient temperature; a and b are both preset temperature values.

7. The method according to claim 1, characterized in that Also includes: Get the initial evaporator temperature and ambient temperature; When the initial evaporator temperature is less than or equal to the second preset temperature and the ambient temperature is less than or equal to the third preset temperature, it is determined that the evaporator needs to be defrosted.

8. The method according to claim 1, characterized in that Also includes: In the case where the evaporator needs to be defrosted, determining whether the water tank temperature is greater than or equal to a fourth preset temperature; When the water tank temperature is greater than or equal to a fourth preset temperature, performing the step of setting the set water volume required for defrosting; When the water tank temperature is lower than a fourth preset temperature, the evaporator is defrosted based on refrigerant defrosting or electric heating defrosting.

9. The method according to claim 1, characterized in that: Also includes: When the evaporator needs to be defrosted, the fan of the evaporator is turned off, and then the step of controlling the switch valve to open is performed; When the current evaporator temperature is greater than or equal to a first preset temperature, after controlling the switch valve to close, the fan of the evaporator is turned on again.

10. A defrosting device for a heat pump system, characterized in that: A bypass pipe is provided at the water outlet of the water tank of the heat pump system, and the water outlet of the bypass pipe faces the evaporator of the heat pump system; The bypass pipe is provided with a switch valve; The device comprises: A setting module, used for setting a set amount of water required for defrosting when the evaporator needs to be defrosted; a processing module, used for controlling the switch valve to open so as to spray hot water to the evaporator through the bypass pipe, obtaining an actual water volume of the sprayed hot water, and determining whether the actual water volume reaches a set water volume; a judgment module, configured to judge whether a current evaporator temperature of the heat pump system is greater than or equal to a first preset temperature when the actual water volume reaches a set water volume; The processing module is further configured to control the switch valve to close when the current evaporator temperature is greater than or equal to a first preset temperature.

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