Air conditioning control system and method with heat recovery

Abstract

An air conditioner control system with heat recovery, comprising a mode detection module, a judgment module and an adjustment module; the mode detection module is used for detecting the running mode of the air conditioner system, the judgment module is used for acquiring the surface temperature of the evaporator after the air conditioner is started for a preset time when the air conditioner is in the heating mode, and sending an adjustment instruction to the adjustment module if the surface temperature is less than a first temperature threshold; the adjustment module is used for accepting the adjustment instruction, acquiring the outdoor temperature, the water temperature in the heat recovery device and the temperature difference between the two, and judging whether the first valve needs to be opened according to the outdoor temperature, the water temperature in the heat recovery device and the temperature difference between the two. By intelligently judging whether the first valve needs to be opened to adjust the flow of the water circuit, when the first valve is opened, the water in the heat recovery device enters the water pipe, and the temperature of the evaporator surface is raised through heat exchange, thereby achieving the effect of defrosting.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioner control, in particular to an air conditioner control system and method with heat recovery. BACKGROUND

[0002] With the development of the times, more and more household air conditioners are equipped with heat recovery technology. Heat recovery technology mainly collects, stores and utilizes the excess heat generated during the refrigeration or heating process of the air conditioner. These heat is usually wasted, but heat recovery technology can convert it into reusable energy, thereby improving energy utilization efficiency. The recovered heat is usually used to heat water, which can be used by users.

[0003] In the heat recovery technology, the heat energy of the compressor output refrigerant is absorbed to reduce the temperature of the refrigerant entering the condenser, thereby reducing the heat waste of the condenser. However, in the heating mode of the air conditioner, the evaporator of the outdoor unit will frost. This is because when heating, the outdoor unit absorbs heat and the indoor unit dissipates heat. When the outdoor temperature is low, the evaporator body temperature will drop below 0 degrees, and the surrounding moisture will quickly condense into frost, thereby causing the radiator to frost. When the heat recovery device is not connected, the condenser can deliver waste heat to the radiator for defrosting. However, after installing the heat recovery device, the waste heat temperature of the condenser is insufficient to effectively defrost the radiator. Therefore, how to defrost the radiator after installing the heat recovery device has become a problem to be solved in the air conditioner. SUMMARY

[0004] In view of the above defects, the present application aims to provide an air conditioner control system and method with heat recovery to solve the problem of evaporator frosting in heating mode.

[0005] To achieve this purpose, the present application adopts the following technical solution: an air conditioner control system with heat recovery, comprising: a compressor, a condenser, a heat recovery device, an evaporator and an outer water pipe;

[0006] The gas output end of the compressor is connected with the gas input end of the heat recovery device, the gas output end of the heat recovery device is connected with the gas input end of the condenser, the liquid output end of the condenser is connected with the liquid input end of the evaporator, and the gas output end of the evaporator is connected with the gas input end of the compressor;

[0007] The surface of the evaporator is provided with the outer water pipe;

[0008] The heat recovery device is further provided with a first liquid output end and a second liquid output end, the first liquid output end of the heat recovery device is connected with the outer water pipe, so that the outer water pipe and the heat recovery device form a water circuit, the second liquid output end is connected with user water, and the first liquid output end and the second liquid output end are respectively provided with a first valve and a second valve;

[0009] Further comprising a mode detection module, a judgment module and an adjustment module;

[0010] The mode detection module is used for detecting the operation mode of the air conditioning system, wherein the operation mode includes a cooling mode and a heating mode;

[0011] The judgment module is used for acquiring the surface temperature of the evaporator after the air conditioner is started for a preset time when the air conditioner is in the heating mode, and sending an adjustment instruction to the adjustment module if the surface temperature is less than a first temperature threshold;

[0012] The adjustment module is used for accepting the adjustment instruction, acquiring the outdoor temperature, the water temperature in the heat recovery device and the temperature difference between the two, and judging whether the first valve needs to be opened according to the outdoor temperature, the water temperature in the heat recovery device and the temperature difference between the two.

[0013] Preferably, when the water temperature in the heat recovery device is lower than a second temperature threshold, no instruction of opening the first valve is sent, and the judgment module is called again after waiting for a preset time again;

[0014] When the water temperature in the heat recovery device is higher than the second temperature threshold, it is judged whether the difference between the outdoor temperature and the water temperature in the heat recovery device is greater than a difference threshold, if not, no instruction of opening the first valve is sent, and the judgment module is called again after waiting for a preset time again, if yes, the opening degree of the first valve is adjusted according to the surface temperature, and an instruction of closing the second valve is sent.

[0015] Preferably, the specific steps of adjusting the opening degree of the first valve according to the surface temperature are as follows:

[0016] When the surface temperature is less than a fourth temperature threshold, the first valve is opened with the maximum opening degree;

[0017] When the surface temperature is greater than the fourth temperature threshold and less than a third temperature threshold, the surface temperature and the water temperature in the heat recovery device are acquired as a first difference, and the opening degree of the first valve is adjusted according to the first difference;

[0018] When the surface temperature is greater than the third temperature threshold and less than a first temperature threshold, the first valve is opened with a 1 / 4 opening degree.

[0019] Preferably, the specific steps of adjusting the opening degree of the first valve according to the first difference value are as follows:

[0020] The first valve is opened at 1 / 2 of the opening degree, and waits for a cycle of the water pump to run, and then the change value of the first difference value is obtained again, and the heat exchange coefficient of the evaporator is obtained according to the change value of the first difference value;

[0021] When the heat exchange coefficient is greater than the first coefficient threshold, the opening degree of the first valve is reduced according to the preset opening degree;

[0022] When the heat exchange coefficient is less than the first coefficient threshold and greater than the second coefficient threshold, the current opening degree of the first valve is maintained;

[0023] When the heat exchange coefficient is less than the second coefficient threshold, the opening degree of the first valve is increased according to the preset opening degree.

[0024] Preferably, the formula for obtaining the heat exchange coefficient is as follows:

[0025] ; wherein is an empirical coefficient, is the change value of the first difference value, S is the area of the outer water pipe in contact with the evaporator, and A is the velocity coefficient corresponding to the water flow rate in the outer water pipe.

[0026] A control method of an air conditioner with heat recovery, applied to a control system of the air conditioner with heat recovery, comprising the following steps:

[0027] Step S1: detecting the operation mode of the air conditioning system;

[0028] Step S2: when the air conditioner is in a heating mode, the surface temperature of the evaporator is obtained after the air conditioner is turned on for a preset time, and if the surface temperature is less than a first temperature threshold, step S3 is executed.

[0029] Step S3: obtaining the outdoor temperature, the water temperature in the heat recovery device, and the temperature difference between the two, and determining whether the first valve needs to be opened according to the outdoor temperature, the water temperature in the heat recovery device, and the temperature difference between the two.

[0030] Preferably, the step of determining whether the first valve needs to be opened is as follows:

[0031] When the water temperature in the heat recovery device is lower than a second temperature threshold, no instruction to open the first valve is issued, and step S3 is executed again after waiting for a preset time again;

[0032] When the water temperature in the heat recovery device is higher than the second temperature threshold, it is determined whether the difference between the outdoor temperature and the water temperature in the heat recovery device is greater than the difference threshold, if less, no instruction is issued to open the first valve, and after waiting for a preset time again, step S3 is executed again, if greater, the opening degree of the first valve is adjusted according to the surface temperature, and an instruction is issued to close the second valve.

[0033] Preferably, the specific steps of adjusting the opening degree of the first valve according to the surface temperature are as follows:

[0034] When the surface temperature is less than the fourth temperature threshold, the first valve is opened with the maximum opening degree;

[0035] When the surface temperature is greater than the fourth temperature threshold and less than the third temperature threshold, the surface temperature and the water temperature in the heat recovery device are obtained as a first difference, and the opening degree of the first valve is adjusted according to the first difference;

[0036] When the surface temperature is greater than the third temperature threshold and less than the first temperature threshold, the first valve is opened with a 1 / 4 opening degree.

[0037] Preferably, the specific steps of adjusting the opening degree of the first valve according to the first difference are as follows:

[0038] The first valve is opened with a 1 / 2 opening degree, and after waiting for a cycle of the water pump operation, the change value of the first difference is obtained again, and the heat exchange coefficient of the evaporator is obtained according to the change value of the first difference;

[0039] When the heat exchange coefficient is greater than a first coefficient threshold, the opening degree of the first valve is reduced according to a preset opening degree;

[0040] When the heat exchange coefficient is less than the first coefficient threshold and greater than a second coefficient threshold, the current opening degree of the first valve is maintained;

[0041] When the heat exchange coefficient is less than the second coefficient threshold, the opening degree of the first valve is increased according to a preset opening degree.

[0042] One of the above technical solutions has the following advantages or beneficial effects: the present application additionally provides an outer water pipe, and then intelligently determines whether the first valve needs to be opened to adjust the flow of the water circuit, and when the first valve is opened, the water in the heat recovery device enters the water pipe, and the temperature of the evaporator surface is raised through heat exchange, thereby achieving the effect of defrosting. BRIEF DESCRIPTION OF DRAWINGS

[0043] Fig. 1 It is a structural schematic diagram of an embodiment of the system of the present application.

[0044] Fig. 2is a flow chart of an embodiment of the method of the present application.

[0045] wherein: compressor 1, evaporator 2, outer water pipe 3, first valve 4, heat recovery device 5, condenser 6, second valve 7. DETAILED DESCRIPTION

[0046] Embodiments of the present application are described below in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0047] In the description of embodiments of the present application, the terms "first", "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0048] In addition, the terms "first", "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise stated, the meaning of "multiple" is two or more. The specific meaning of the above terms in the present application can be understood in specific circumstances for those skilled in the art.

[0049] As shown in Figs. 1-2 An air conditioner control system with heat recovery, comprising: a compressor (1), a condenser (6), a heat recovery device (5), an evaporator (2) and an outer water pipe (3);

[0050] The gas output end of the compressor (1) is connected with the gas input end of the heat recovery device (5), the gas output end of the heat recovery device (5) is connected with the gas input end of the condenser (6), the liquid output end of the condenser (6) is connected with the liquid input end of the evaporator (2), and the liquid output end of the evaporator (2) is connected with the liquid input end of the compressor (1);

[0051] The surface of the evaporator (2) is provided with the outer water pipe (3);

[0052] The heat recovery device (5) is further provided with a first liquid output end and a second liquid output end, the first liquid output end of the heat recovery device (5) is connected with the outer water pipe (3), so that the outer water pipe (3) and the heat recovery device (5) form a water circuit, the second liquid output end is connected with user water, and the first liquid output end and the second liquid output end are respectively provided with a first valve (4) and a second valve (7);

[0053] Further comprising a mode detection module, a judgment module and an adjustment module;

[0054] The mode detection module is used for detecting the operation mode of the air conditioning system, wherein the operation mode includes a cooling mode and a heating mode;

[0055] The judgment module is used for acquiring the surface temperature of the evaporator (2) after the air conditioner is started for a preset time when the air conditioner is in the heating mode, and sending an adjustment instruction to the adjustment module if the surface temperature is less than a first temperature threshold;

[0056] The adjustment module is used for accepting the adjustment instruction, acquiring the outdoor temperature, the water temperature in the heat recovery device (5) and the temperature difference between the two, and judging whether the first valve (4) needs to be opened according to the outdoor temperature, the water temperature in the heat recovery device (5) and the temperature difference between the two.

[0057] In order to solve the problem that the air flow is affected due to icing of the outdoor evaporator (2) in the heating mode in winter, finally resulting in poor heating effect. In the present application, the outer water pipe (3) is arranged outside the evaporator (2). If the surface temperature is lower than the preset first temperature threshold (2-4 ℃), it indicates that the evaporator (2) may face the risk of icing, at this time the judgment module sends an adjustment instruction to the adjustment module. After receiving the instruction, the adjustment module intelligently judges whether the first valve (4) needs to be opened to adjust the flow of the water circuit according to the outdoor temperature, the water temperature in the heat recovery device (5) and the temperature difference between the two. When the first valve (4) is opened, the water in the heat recovery device (5) enters the water pipe, and the temperature of the evaporator (2) surface is raised through heat exchange, thereby realizing the effect of defrosting.

[0058] Preferably, when the water temperature in the heat recovery device (5) is lower than the second temperature threshold, the instruction to open the first valve (4) is not sent, and the judgment module is called again after waiting for a preset time again;

[0059] When the water temperature in the heat recovery device (5) is higher than the second temperature threshold, it is determined whether the difference between the outdoor temperature and the water temperature in the heat recovery device (5) is greater than the difference threshold, if less, no instruction is issued to open the first valve (4), and after waiting for a preset time again, the judgment module is called again, if greater, the opening degree of the first valve (4) is adjusted according to the surface temperature, and an instruction is issued to close the second valve (7).

[0060] Of course, when the air conditioner runs for a preset time, the heat energy generated may not be able to raise the water temperature to a temperature at which defrosting can be performed. Therefore, when the water temperature in the heat recovery device (5) is lower than the second temperature threshold, no instruction is issued to open the first valve (4), and the heat recovery device (5) is continued to be heated, reducing unnecessary heat loss, and after waiting for a preset time (1 hour) again, the judgment module is called again.

[0061] When the water temperature in the heat recovery device (5) is higher than the second temperature threshold, at this time, due to the operation for a period of time, the external environment may also change, resulting in temperature increase. Therefore, it is also necessary to determine whether the difference between the outdoor temperature and the water temperature in the heat recovery device (5) is greater than the difference threshold, if greater, it indicates that the external outdoor temperature does not increase with time, resulting in the water temperature in the heat recovery device (5) increasing more and more, so defrosting is needed, and at this time, in order to ensure that the water temperature is sufficient for defrosting, the second valve (7) also needs to be closed. Because when the user uses hot water, new cold water will be supplemented into the heat recovery device (5), thereby causing the water temperature in the heat recovery device (5) to decrease, and the quality of defrosting cannot be ensured.

[0062] Preferably, the specific steps of adjusting the opening degree of the first valve (4) according to the surface temperature are as follows:

[0063] When the surface temperature is less than the fourth temperature threshold, the first valve (4) is opened with the maximum opening degree;

[0064] When the surface temperature is greater than the fourth temperature threshold and less than the third temperature threshold, the surface temperature and the water temperature in the heat recovery device (5) are obtained as a first difference, and the opening degree of the first valve (4) is adjusted according to the first difference;

[0065] When the surface temperature is greater than the third temperature threshold and less than the first temperature threshold, the first valve (4) is opened with 1 / 4 of the opening degree.

[0066] The fourth temperature threshold is -5℃, when the surface temperature is less than the fourth temperature threshold, it means that the temperature of the outer surface of the evaporator (2) is very low, and hot water needs to be supplied to the outer water pipe (3) at the maximum flow rate for heat exchange, so as to realize defrosting. The third temperature threshold is 0~1℃, when the surface temperature is greater than the fourth temperature threshold and less than the third temperature threshold, it means that the temperature is just right for frosting, at this time, the opening degree of the valve is adjusted by calculating the difference (first difference) between the surface temperature and the water temperature in the heat recovery device (5). This intelligent adjustment can dynamically adjust the heat recovery according to the actual situation, avoiding unnecessary energy waste. When the surface temperature is greater than the third temperature threshold and less than the first temperature threshold, it is the temperature for preparing to frost, only a certain amount of hot water needs to be input for heat exchange to avoid frosting, and unnecessary heat loss can also be reduced.

[0067] It is worth mentioning that during the adjustment process, when the surface temperature is greater than the first temperature threshold, the first valve (4) needs to be closed. So that the second valve (7) can be opened, so that the user can normally use the hot water in the heat recovery device (5). Before adjustment, if the user is using the hot water of the heat recovery device (5) (i.e. the second valve (7) is in an open state), the user needs to stop using the hot water, and then the judgment module is called again to judge the temperature condition.

[0068] Preferably, the specific steps of adjusting the opening degree of the first valve (4) according to the first difference are as follows:

[0069] The first valve (4) is opened at 1 / 2 of the opening degree, waits for one cycle of the water pump operation, and then obtains the change value of the first difference again. The heat exchange coefficient of the evaporator (2) is obtained according to the change value of the first difference.

[0070] When the heat exchange coefficient is greater than the first coefficient threshold, the opening degree of the first valve (4) is reduced according to the preset opening degree.

[0071] When the heat exchange coefficient is less than the first coefficient threshold and greater than the second coefficient threshold, the current opening degree of the first valve (4) is maintained.

[0072] When the heat exchange coefficient is less than the second coefficient threshold, the opening degree of the first valve (4) is increased according to the preset opening degree.

[0073] Firstly, the first valve (4) is opened at 1 / 2 of the opening degree. Such a setting can not only ensure a certain amount of heat recovery, but also avoid energy waste or overheating of the evaporator (2) due to too large opening degree. Then after one cycle, the first difference is obtained again, and the heat exchange coefficient can be obtained according to the change value of the first difference. The heat exchange coefficient can more accurately evaluate the current heat exchange condition, providing reliable data support for the subsequent control strategy.

[0074] When the heat exchange coefficient is greater than the first coefficient threshold, it indicates that the current heat exchange efficiency is high, but there may be waste of overheating. Therefore, the system will reduce the opening degree of the first valve (4) according to the preset opening degree to reduce the heat energy recovery amount and prevent heat energy waste.

[0075] When the heat exchange coefficient is between the first coefficient threshold and the second coefficient threshold, it indicates that the current heat exchange efficiency is moderate, which meets the defrosting demand and does not consume too much heat energy. Therefore, the system will keep the current opening degree of the first valve (4) unchanged to ensure stable operation of the system.

[0076] When the heat exchange coefficient is less than the second coefficient threshold, it indicates that the current heat exchange efficiency is low, which cannot effectively improve the surface temperature of the evaporator (2) to meet the defrosting demand. At this time, the system will increase the opening degree of the first valve (4) according to the preset opening degree to increase the supply amount of hot water and improve the heat exchange efficiency to meet the defrosting demand.

[0077] Preferably, the heat exchange coefficient is obtained according to the following formula:

[0078] ; wherein is an empirical coefficient, is the change value of the first difference, S is the area of the outer water pipe (3) in contact with the evaporator (2), and A is the velocity coefficient corresponding to the water flow rate in the outer water pipe (3).

[0079] A control method of an air conditioner with heat recovery, applied to the control system of the air conditioner with heat recovery, comprising the following steps:

[0080] Step S1: detecting the operation mode of the air conditioning system;

[0081] Step S2: when the air conditioner is in heating mode, the surface temperature of the evaporator (2) is obtained after the air conditioner is turned on for a preset time. If the surface temperature is less than the first temperature threshold, step S3 is executed.

[0082] Step S3: obtaining the outdoor temperature, the water temperature in the heat recovery device (5), and the temperature difference between the two, and determining whether the first valve (4) needs to be opened according to the outdoor temperature, the water temperature in the heat recovery device (5), and the temperature difference between the two.

[0083] Preferably, the step of determining whether the first valve (4) needs to be opened is as follows:

[0084] When the water temperature in the heat recovery device (5) is lower than the second temperature threshold, no instruction is issued to open the first valve (4), and step S3 is executed again after waiting for a preset time again.

[0085] When the water temperature in the heat recovery device (5) is higher than the second temperature threshold, it is determined whether the temperature difference is greater than the difference threshold, if less, no instruction is issued to open the first valve (4), and after waiting for a preset time again, step S3 is executed again, if greater, the opening degree of the first valve (4) is adjusted according to the surface temperature, and an instruction is issued to close the second valve (7).

[0086] Preferably, the specific steps of adjusting the opening degree of the first valve (4) according to the surface temperature are as follows:

[0087] When the surface temperature is less than the fourth temperature threshold, the first valve (4) is opened at the maximum opening degree;

[0088] When the surface temperature is greater than the fourth temperature threshold and less than the third temperature threshold, the surface temperature and the water temperature in the heat recovery device (5) are obtained as a first difference, and the opening degree of the first valve (4) is adjusted according to the first difference;

[0089] When the surface temperature is greater than the third temperature threshold and less than the first temperature threshold, the first valve (4) is opened at 1 / 4 of the opening degree.

[0090] Preferably, the specific steps of adjusting the opening degree of the first valve (4) according to the first difference are as follows:

[0091] The first valve (4) is opened at 1 / 2 of the opening degree, and after waiting for a cycle of the water pump operation, the change value of the first difference is obtained again, and the heat exchange coefficient of the evaporator (2) is obtained according to the change value of the first difference;

[0092] When the heat exchange coefficient is greater than the first coefficient threshold, the opening degree of the first valve (4) is reduced according to a preset opening degree;

[0093] When the heat exchange coefficient is less than the first coefficient threshold and greater than the second coefficient threshold, the current opening degree of the first valve (4) is maintained;

[0094] When the heat exchange coefficient is less than the second coefficient threshold, the opening degree of the first valve (4) is increased according to a preset opening degree.

[0095] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0096] While embodiments of the application have been shown and described, it is to be understood that the application is not limited to the details of the embodiments described, since the scope of the application will be defined with respect to the claims and their equivalents.

Claims

1. An air conditioning control system with heat recovery, characterized in that, include: Compressor, condenser, heat recovery equipment, evaporator, and external water pipes; The gas output end of the compressor is connected to the gas input end of the heat recovery equipment, the gas output end of the heat recovery equipment is connected to the gas input end of the condenser, the liquid output end of the condenser is connected to the liquid input end of the evaporator, and the gas output end of the evaporator is connected to the gas input end of the compressor. The outer water pipe is wound around the surface of the evaporator; The heat recovery equipment is also provided with a first liquid output end and a second liquid output end. The first liquid output end of the heat recovery equipment is connected to the external water pipe, so that the external water pipe and the heat recovery equipment form a water circuit. The second liquid output end is connected to the user's water supply. The first liquid output end and the second liquid output end are respectively provided with a first valve and a second valve. It also includes a pattern detection module, a judgment module, and an adjustment module; The mode detection module is used to detect the operating mode of the air conditioning system, wherein the operating mode includes cooling mode and heating mode. The judgment module is used to obtain the surface temperature of the evaporator after a preset time after the air conditioner is turned on when the air conditioner is in heating mode. If the surface temperature is less than the first temperature threshold, an adjustment command is sent to the adjustment module. The adjustment module is used to receive the adjustment command. After receiving the adjustment command, it obtains the outdoor temperature, the water temperature in the heat recovery equipment and the temperature difference between the two, and determines whether the first valve needs to be opened based on the outdoor temperature, the water temperature in the heat recovery equipment and the temperature difference between the two. When the water temperature inside the heat recovery equipment is lower than the second temperature threshold, the command to open the first valve will not be issued, and the judgment module will be called again after waiting for a preset time. When the water temperature inside the heat recovery equipment is higher than the second temperature threshold, it is determined whether the difference between the outdoor temperature and the water temperature inside the heat recovery equipment is greater than the difference threshold. If it is less than the threshold, the command to open the first valve is not issued, and the judgment module is called again after waiting for a preset time. If it is greater than the threshold, the opening degree of the first valve is adjusted according to the surface temperature, and the command to close the second valve is issued. The specific steps for adjusting the opening degree of the first valve based on the surface temperature are as follows: When the surface temperature is less than the fourth temperature threshold, the first valve is opened to its maximum opening degree. When the surface temperature is greater than the fourth temperature threshold and less than the third temperature threshold, the surface temperature and the water temperature in the heat recovery equipment are obtained as the first difference, and the opening degree of the first valve is adjusted according to the first difference. When the surface temperature is greater than the third temperature threshold and less than the first temperature threshold, the first valve is opened at 1 / 4 of its opening degree.

2. An air conditioning control system with heat recovery according to claim 1, characterized in that, The specific steps for adjusting the opening degree of the first valve based on the first difference are as follows: The first valve is opened to half its opening degree. After waiting for one cycle of water pump operation, the change value of the first difference is obtained again. The heat transfer coefficient of the evaporator is obtained based on the change value of the first difference. When the heat transfer coefficient is greater than the first coefficient threshold, the opening degree of the first valve is reduced according to the preset opening degree. If the heat transfer coefficient is less than the first coefficient threshold and greater than the second coefficient threshold, then the current opening degree of the first valve is maintained. When the heat transfer coefficient is less than the second coefficient threshold, the opening degree of the first valve is adjusted according to the preset opening degree.

3. An air conditioning control system with heat recovery according to claim 2, characterized in that, The formula for obtaining the heat transfer coefficient is as follows: ;in This is an empirical coefficient. Let S be the change value of the first difference, S be the contact area between the outer water pipe and the evaporator, and A be the velocity coefficient corresponding to the water flow velocity in the outer water pipe.

4. An air conditioning control method with heat recovery, applied to an air conditioning control system with heat recovery as described in any one of claims 1 to 3, characterized in that, Includes the following steps: Step S1: Detect the operating mode of the air conditioning system; Step S2: When the air conditioner is in heating mode, after a preset time after the air conditioner is turned on, the surface temperature of the evaporator is obtained. If the surface temperature is less than the first temperature threshold, step S3 is executed. Step S3: Obtain the outdoor temperature, the water temperature inside the heat recovery equipment, and the temperature difference between the two. Determine whether the first valve needs to be opened based on the outdoor temperature, the water temperature inside the heat recovery equipment, and the temperature difference between the two. The specific steps to determine whether the first valve needs to be opened are as follows: When the water temperature in the heat recovery equipment is lower than the second temperature threshold, the command to open the first valve is not issued, and after waiting for a preset time, step S3 is executed again. When the water temperature inside the heat recovery equipment is higher than the second temperature threshold, it is determined whether the difference between the outdoor temperature and the water temperature inside the heat recovery equipment is greater than the difference threshold. If it is less than the threshold, the instruction to open the first valve is not issued, and after waiting for a preset time, step S3 is executed again. If it is greater than the threshold, the opening degree of the first valve is adjusted according to the surface temperature, and the instruction to close the second valve is issued. The specific steps for adjusting the opening degree of the first valve based on the surface temperature are as follows: When the surface temperature is less than the fourth temperature threshold, the first valve is opened to its maximum opening degree. When the surface temperature is greater than the fourth temperature threshold and less than the third temperature threshold, the surface temperature and the water temperature in the heat recovery equipment are obtained as the first difference, and the opening degree of the first valve is adjusted according to the first difference. When the surface temperature is greater than the third temperature threshold and less than the first temperature threshold, the first valve is opened at 1 / 4 of its opening degree.

5. An air conditioning control method with heat recovery according to claim 4, characterized in that, The specific steps for adjusting the opening degree of the first valve based on the first difference are as follows: The first valve is opened to half its opening degree. After waiting for one cycle of water pump operation, the change value of the first difference is obtained again. The heat transfer coefficient of the evaporator is obtained based on the change value of the first difference. When the heat transfer coefficient is greater than the first coefficient threshold, the opening degree of the first valve is reduced according to the preset opening degree. If the heat transfer coefficient is less than the first coefficient threshold and greater than the second coefficient threshold, then the current opening degree of the first valve is maintained. When the heat transfer coefficient is less than the second coefficient threshold, the opening degree of the first valve is adjusted according to the preset opening degree.

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