Air conditioner waterway anti-freezing control system and method

Abstract

The invention provides an air conditioner waterway anti-freezing control system and method, and relates to the field of waterway anti-freezing. In the application, when the environment temperature is relatively low, in order to prevent the water in the heat exchanger from being frozen, the water in the target heat source is used for carrying out heat exchange operation on the water in the heat exchanger through the water circulation loop, so that the temperature of the water in the heat exchanger is increased, and the water in the heat exchanger is prevented from being frozen. In addition, the auxiliary heat source is arranged, the appropriate target heat source can be selected according to requirements, and therefore the selectivity of the heat source is improved. Besides, under the condition that the target heat source does not exist, the refrigerant is used for conducting heat exchange operation on the water in the heat exchanger, that is, when the auxiliary heat source cannot be used, the refrigerant can still be used for providing heat for the water in the heat exchanger, so that the water in the heat exchanger is prevented from being frozen. From the above, water in the heat exchanger is prevented from being frozen through the angle of combination of two protection modes of the auxiliary heat source and the refrigerant, and the reliability of freezing protection is improved.

Description

Technical Field

[0001] The present application relates to the field of water channel antifreeze, and more specifically, to an air conditioning water channel antifreeze control system and method. Background Art

[0002] Traditional air conditioning systems rely on the evaporation and condensation process of refrigerants to transfer heat and achieve cooling and heating functions, which requires that the refrigerant circulation pipeline must extend to the indoor user end. However, this design results in low integration of the whole machine, large refrigerant filling volume and safety risks. In contrast, the fluorine-free indoor air conditioner will centrally install the plate heat exchanger used for refrigerant circulation on the outdoor side of the external unit. The plate heat exchanger can be used as an evaporator or condenser. The plate heat exchanger exchanges heat with the refrigerant through circulating water, and transfers the cold or heat of the water to the indoor user end. This design significantly improves the integration and operational safety of the system. At the same time, the specific heat capacity of the circulating water is higher, and the user experience is more comfortable during operation.

[0003] However, when the ambient temperature is low, there is a lack of heat input in the water circuit, and the circulating water continues to release heat and cool down outdoors, eventually freezing at flow-restricted locations such as the plate heat exchanger, leading to damage to the plate heat exchanger, refrigerant leakage and other accidents. Summary of the invention

[0004] In view of this, the present application provides an air conditioning water circuit antifreeze control system and method to solve the problem of circulating water freezing at flow-restricted locations such as plate heat exchangers when the ambient temperature is low.

[0005] In order to solve the above technical problems, this application adopts the following technical solutions:

[0006] An air conditioning water circuit antifreeze control system, comprising:

[0007] Auxiliary heat source, water circulation loop and controller;

[0008] The output end of each auxiliary heat source is connected to the input end of the water circulation loop, and the output end of the water circulation loop is connected to the input end of each auxiliary heat source; the heat exchanger arranged outdoors is located in the water circulation loop;

[0009] The controller is used to select a target heat source that can provide heat from the auxiliary heat sources when the ambient temperature and the water temperature of the heat exchanger meet the antifreeze control conditions, and use the water inside the target heat source to perform heat exchange operations on the water in the heat exchanger through the water circulation loop; wherein, in the absence of the target heat source, the refrigerant is used to perform heat exchange operations on the water in the heat exchanger.

[0010] Optionally, there are multiple auxiliary heat sources; the water circulation loop includes:

[0011] The first valve, the second valve, the circulating water pump, the third valve, the buffer water tank and the fourth valve;

[0012] The input end of the first valve is connected to the output end of each of the auxiliary heat sources respectively; the output end of the first valve is connected to the first input end of the second valve, the output end of the second valve is connected to the first water channel connection end of the heat exchanger, the second water channel connection end of the heat exchanger is connected to the input end of the third valve through the circulating water pump, the first output end of the third valve is connected to the input end of the fourth valve through the buffer water tank, and the output end of the fourth valve is connected to the input end of each of the auxiliary heat sources respectively; the second input end of the second valve is connected to the second output end of the third valve;

[0013] The controller is used to set the conduction directions of the first valve, the second valve, the third valve and the fourth valve in the water circulation loop based on the flow path of the water inside the target heat source when performing heat exchange operations on the water in the heat exchanger through the water circulation loop, and control the operation of the circulating water pump.

[0014] Optionally, the refrigerant heat exchange circuit in the air conditioning water circuit antifreeze control system includes:

[0015] Compressor, reversing valve, electronic expansion valve and air-cooled heat exchange device;

[0016] The reversing valve is respectively connected to the two ends of the compressor, the second water path connection end of the heat exchanger, and one end of the air-cooled heat exchange device; the electronic expansion valve is respectively connected to the first water path connection end of the heat exchanger and the other end of the air-cooled heat exchange device;

[0017] The controller is used to control the second input end of the second valve to be connected with the second output end of the third valve when the refrigerant is used to perform heat exchange operation on the water in the heat exchanger, control the operation of the compressor, and control the operation of the circulating water pump.

[0018] Optionally, the auxiliary heat source includes a water heater and a radiator.

[0019] An air conditioning water circuit antifreeze control method is applied to the controller in the above-mentioned air conditioning water circuit antifreeze control system, and the air conditioning water circuit antifreeze control method comprises:

[0020] When the ambient temperature and the water temperature of the heat exchanger meet the antifreeze control condition, a target heat source capable of providing heat is selected from the auxiliary heat sources;

[0021] The water in the target heat source is used through the water circulation loop to perform heat exchange operation on the water in the heat exchanger; wherein, in the absence of the target heat source, the refrigerant is used to perform heat exchange operation on the water in the heat exchanger.

[0022] Optionally, when the ambient temperature and the water temperature of the heat exchanger meet the antifreeze control condition, selecting a target heat source capable of providing heat from the auxiliary heat sources includes:

[0023] Detecting the ambient temperature and the water temperature of the heat exchanger;

[0024] When the ambient temperature and the water temperature of the heat exchanger are less than corresponding thresholds, obtaining auxiliary heat sources arranged in order of use;

[0025] According to the arrangement order of the auxiliary heat sources, a target heat source whose operating conditions and internal water temperature meet corresponding requirements is screened out from the auxiliary heat sources.

[0026] Optionally, according to the arrangement order of the auxiliary heat sources, a target heat source whose operating condition and internal water temperature meet corresponding requirements is screened out from the auxiliary heat sources, including:

[0027] When the first auxiliary heat source in the arrangement sequence of the auxiliary heat sources is a water heater and the antifreeze enable signal of the water heater is yes, if the water heater is powered by preset electric energy and a reservation use function is set, when the difference between the water temperature of the water heater and the reserved temperature of the water heater is greater than the first temperature difference and the difference between the water temperature of the water heater and the first temperature threshold is greater than the second temperature difference, the water heater is used as the target heat source;

[0028] If the water heater is powered by preset electric energy and the reservation function is not set, when the water temperature of the water heater is greater than the set temperature of the water heater and the difference between the water temperature of the water heater and the first temperature threshold is greater than the second temperature difference, the water heater is used as the target heat source;

[0029] In the case where the first auxiliary heat source in the arrangement sequence of the auxiliary heat sources is a water heater, the second auxiliary heat source is a radiator, the antifreeze enable signal of the water heater is no and the antifreeze enable signal of the radiator is yes, if the radiator operates in a temperature control mode, the radiator is used as a target heat source when the difference between the water temperature of the radiator and the first temperature threshold is greater than the second temperature difference, the difference between the room temperature and the set temperature of the radiator is greater than the third temperature difference, and the difference between the water temperature of the radiator and the room temperature is greater than the fourth temperature difference;

[0030] If the radiator is not operating in the temperature control mode, when the difference between the radiator water temperature and the first temperature threshold is greater than the second temperature difference, the radiator is used as a target heat source.

[0031] Optionally, using the water in the target heat source to perform heat exchange operation on the water in the heat exchanger through the water circulation loop includes:

[0032] In the case where the target heat source is a water heater, based on the flow path of water inside the water heater, the water circulation loop is set as a first conduction path and the circulation water pump is controlled to operate; in the first conduction path, the input end of the first valve is connected to the output end of the water heater, the output end of the second valve is connected to the first water path connection end of the heat exchanger, the second water path connection end of the heat exchanger is connected to the input end of the third valve through the circulation water pump, and the output end of the fourth valve is connected to the input end of the water heater;

[0033] When the target heat source is a radiator, based on the flow path of water inside the radiator, the water circulation loop is set to a second conduction path and the operation of the circulating water pump is controlled; in the second conduction path, the input end of the first valve is connected to the output end of the radiator, the output end of the second valve is connected to the first water path connection end of the heat exchanger, the second water path connection end of the heat exchanger is connected to the input end of the third valve through the circulating water pump, and the output end of the fourth valve is connected to the input end of the radiator.

[0034] Optionally, after using the water inside the target heat source to perform a heat exchange operation on the water in the heat exchanger through the water circulation loop, the method further includes:

[0035] If it is detected that the heat exchange stop condition corresponding to the target heat source is met, the first valve, the second valve, the third valve and the fourth valve are controlled to be closed to stop using the water inside the target heat source through the water circulation loop to perform heat exchange operations on the water in the heat exchanger.

[0036] Optionally, using a refrigerant to perform heat exchange operation on water in the heat exchanger includes:

[0037] The second input end of the second valve is controlled to be connected to the second output end of the third valve, the compressor is controlled to operate, and the circulating water pump is controlled to operate, so as to utilize the refrigerant to perform heat exchange operation on the water in the heat exchanger.

[0038] The present application provides an air conditioning water circuit antifreeze control system and method. In the present application, when the ambient temperature is low, in order to prevent the water in the heat exchanger from freezing, the water inside the target heat source will be used through the water circulation loop to perform heat exchange operations on the water in the heat exchanger, so as to increase the temperature of the water in the heat exchanger and prevent the water in the heat exchanger from freezing. In addition, an auxiliary heat source is provided in the present application, and a suitable target heat source can be selected according to demand to improve the selectivity of the heat source. In addition, in the absence of the target heat source, a refrigerant is used to perform heat exchange operations on the water in the heat exchanger, that is, when the auxiliary heat source cannot be used, the refrigerant can still be used to provide heat to the water in the heat exchanger to prevent the water in the heat exchanger from freezing. From the above, it can be seen that the present application prevents the freezing of water in the heat exchanger by combining the two protection methods of auxiliary heat source and refrigerant, thereby improving the reliability of freezing protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0040] Figure 1 A schematic diagram of the structure of an air conditioning water circuit antifreeze control system provided in an embodiment of the present application;

[0041] Figure 2 A schematic diagram of the structure of another air conditioning water circuit antifreeze control system provided in an embodiment of the present application;

[0042] Figure 3 A method flow chart of an air conditioning water circuit antifreeze control method provided in an embodiment of the present application;

[0043] Figure 4 A schematic diagram of the structure of another air conditioning water circuit antifreeze control system provided in an embodiment of the present application;

[0044] Figure 5 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0045] 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.

[0046] Traditional air conditioning systems rely on the evaporation and condensation process of refrigerants to transfer heat and achieve cooling and heating functions, which requires that the refrigerant circulation pipeline must extend to the indoor user end. However, this design leads to low integration of the whole machine, large refrigerant filling volume and safety risks. In contrast, in order to realize the arrangement of the refrigerant circuit on the outdoor side, the water and the refrigerant are usually exchanged with heat, and then the water is passed into the user's room, and the water is used as the medium for transporting heat. The water and the refrigerant are usually exchanged with a plate heat exchanger. In general, the plate heat exchanger used for refrigerant circulation is concentrated on the outdoor side of the external unit. The plate heat exchanger can be used as an evaporator or condenser. The circulating water and the refrigerant are heat exchanged in the plate heat exchanger to transfer the cold or heat of the water to the indoor user end. This design significantly improves the integration and operation safety of the system. At the same time, the specific heat capacity of the circulating water is higher, and the user experience is more comfortable during operation. This makes the fluorine-free air conditioner a major trend in the development of air conditioning.

[0047] However, when the ambient temperature is low, such as in winter when the ambient temperature is below 0°C, if fluorine is not introduced into the house and the air-conditioning system is in standby mode, the refrigerant and water will not exchange heat, and there will be a lack of heat input in the water circuit. The circulating water will continue to release heat and cool down on the outdoor side, and eventually freeze in flow-restricted locations such as the plate heat exchanger, causing damage to the plate heat exchanger, refrigerant leakage and other accidents.

[0048] In actual scenarios, the strategy of maintaining continuous water circulation can be adopted to avoid water freezing. By maintaining continuous water circulation, the risk of water freezing can be avoided to a certain extent, but the reliability and flexibility are still low. When the ambient temperature drops sharply, there is a lack of heat input in the water circuit, and the circulating water continues to release heat and cool down on the outdoor side. Eventually, there is still a high risk of freezing at flow-restricted locations such as plate heat exchangers.

[0049] To this end, in this embodiment, the indoor auxiliary heat source (such as a water heater, radiator, etc.) is connected to the plate heat exchanger to ensure that in standby mode and when the ambient temperature is too low, the auxiliary heat source such as the water heater and radiator provides heat input to the water path in the plate heat exchanger to ensure that there is no possibility of freezing in the water path.

[0050] Based on the above content, an embodiment of the present application provides an air conditioning water circuit antifreeze control system, referring to Figure 1 , which may include:

[0051] Auxiliary heat source, water circulation loop 201 and controller 301.

[0052] Among them, the auxiliary heat source can be Figure 1The auxiliary heat sources 101, 102...10n in the figure, wherein n is a positive integer. In actual scenarios, the value of n can be based on the actual configuration, such as 1, 2, 3, 4, etc. In one implementation, the auxiliary heat source can be one of the water heater and the radiator. In another implementation, the auxiliary heat source can be multiple, such as multiple of the water heater and the radiator, and the number of water heaters and radiators can be based on the actual configuration. A water heater is called an auxiliary heat source. If there are multiple water heaters, it is considered that there is an auxiliary heat source, and the same is true for the radiator. The radiator in this embodiment includes, but is not limited to, floor heating, fan coil units, etc., and multiple radiators can be used in parallel to form an auxiliary heat source.

[0053] The water circulation loop 201 refers to a passage connecting the auxiliary heat source and the heat exchanger in the air conditioner, such as the plate heat exchanger mentioned above, in which valves, circulating water pumps and other components can be configured according to needs. Among them, the valve is used to control the conduction path of the water circulation loop 201, and the circulating water pump is used to provide power for the flow of water to speed up the flow of water, thereby improving the heat exchange between the water in the auxiliary heat source and the water in the heat exchanger.

[0054] The output end of each auxiliary heat source is connected to the input end of the water circulation loop 201, and the output end of the water circulation loop 201 is connected to the input end of each auxiliary heat source; the heat exchanger arranged outdoors is located in the water circulation loop 201. The heat exchanger in this embodiment can be a plate heat exchanger, and other structures can also be used.

[0055] Through the above-mentioned structural setting, the water output by the auxiliary heat source flows out from the output end of the auxiliary heat source, flows through the heat exchanger through the water circulation loop 201, and returns to the auxiliary heat source, realizing the heat exchange operation between the water inside the auxiliary heat source and the water inside the heat exchanger.

[0056] The controller 301, such as an air conditioning controller, is used to implement heat exchange control. Specifically, when the ambient temperature and the water temperature of the heat exchanger meet the antifreeze control conditions, it means that the water inside the heat exchanger is about to be at risk of freezing. In order to avoid water freezing, a target heat source that can provide heat is selected from the auxiliary heat source, and the water inside the target heat source is used through the water circulation loop 201 to perform heat exchange operations on the water in the heat exchanger, thereby increasing the temperature of the water in the heat exchanger and preventing the water in the heat exchanger from freezing.

[0057] In actual scenarios, since it is necessary to select a target heat source that can provide heat, in a special case, if there is no suitable target heat source, the target heat source does not exist. In this case, a bottom line measure is provided. At this time, the refrigerant circulation can be controlled to use the refrigerant heat to perform heat exchange operations on the water in the heat exchanger.

[0058] In this embodiment, when the ambient temperature is low, in order to prevent the water in the heat exchanger from freezing, the water inside the target heat source will be used through the water circulation loop 201 to perform heat exchange operations on the water in the heat exchanger, so as to increase the temperature of the water in the heat exchanger and prevent the water in the heat exchanger from freezing. In addition, an auxiliary heat source is provided in the present application, and a suitable target heat source can be selected according to demand to improve the selectivity of the heat source. In addition, in the absence of the target heat source, a refrigerant is used to perform heat exchange operations on the water in the heat exchanger, that is, when the auxiliary heat source cannot be used, the refrigerant can still be used to provide heat for the water in the heat exchanger to prevent the water in the heat exchanger from freezing. From the above, it can be seen that the present application prevents the freezing of water in the heat exchanger by combining the two protection methods of auxiliary heat source and refrigerant, thereby improving the reliability of freezing protection.

[0059] The above embodiment mentions the water circulation loop 201. In another implementation of the present application, a specific structure of the water circulation loop 201 is given. Figure 2 , among which, 101-compressor, 102-reversing valve, 103-heat exchanger, 104-electronic expansion valve, 105-air-cooled heat exchange device, 201-circulating water pump, 202-buffer water tank, 203-water heater circulating water pump, 204-water heater, 205-radiator circulating water pump, 206-radiator, 207-water purification module, 301-third valve, 302-second valve, 303-fourth valve, 304-first valve, 305-mixing valve, 306-proportional three-way valve, 401-outdoor water circuit temperature sensor, 402-water heater water circuit temperature sensor, 403-radiator water circuit temperature sensor.

[0060] It should be noted that Figure 2 The controller 201 is not shown. The controller 201 can communicate with the outdoor water circuit temperature sensor 401, the water heater water circuit temperature sensor 402, and the radiator water circuit temperature sensor 403 to obtain the corresponding temperature. In addition, it can also control the operation of the above-mentioned valves, circulating water pumps, compressors and other equipment.

[0061] The water circulation loop 201 comprises:

[0062] The first valve 304 , the second valve 302 , the circulating water pump 201 , the third valve 301 , the buffer water tank 202 and the fourth valve 303 .

[0063] The first valve 304 needs to be connected to an auxiliary heat source. If the auxiliary heat source includes the water heater 204 and the radiator 206, the first valve 304 is a three-way valve, and the input end of the three-way valve is respectively connected to the output end of each of the auxiliary heat sources. Generally, the output end of the water heater 204 is provided with a proportional three-way valve 306 and a mixing valve 305, and the input end of the first valve 304 can be connected to the proportional three-way valve 306.

[0064] The output end of the three-way valve is connected to the first input end of the second valve 302. If the auxiliary heat source includes an auxiliary heat source, the first valve 304 may be a four-way valve, a five-way valve, etc., and the input end of the first valve 304 is respectively connected to the output end of each of the auxiliary heat sources, and the output end of the first valve 304 is connected to the first input end of the second valve 302. It should be noted that if there is only one auxiliary heat source, the first valve 304 is a two-way valve.

[0065] The second valve 302 is generally a three-way valve, the first input end of the second valve 302 is connected to the output end of the first valve 304, the second input end of the second valve 302 is connected to the second output end of the third valve 301, and the output end of the second valve 302 is connected to the first water channel connection end of the heat exchanger 103.

[0066] The third valve 301 may be a three-way valve, the second water channel connection end of the heat exchanger 103 is connected to the input end of the third valve 301 through the circulating water pump 201, the first output end of the third valve 301 is connected to the input end of the fourth valve 303 through the buffer water tank 202, and the second output end of the third valve 301 is connected to the second input end of the second valve 302. The functions of the buffer water tank 202 are as follows:

[0067] Installing the buffer water tank 202 can increase the water capacity of the system and make the water temperature change more stable. In addition, the water temperature change in the water circulation loop 201 will generate gas, which will cause system instability if not discharged in time. The buffer water tank 202 discharges gas through the automatic exhaust valve to ensure the normal operation of the system and reduce the occurrence of failures.

[0068] The fourth valve 303 is the same as the first valve 304 . Since it needs to be connected to the input end of the auxiliary heat source, it can be a two-way valve, a three-way valve, a four-way valve, a five-way valve, etc.

[0069] The input end of the fourth valve 303 is connected to the output end of the buffer water tank 202 , and the output end of the fourth valve 303 is respectively connected to the input end of each of the auxiliary heat sources.

[0070] When the auxiliary heat source includes a water heater 204 , the fourth valve 303 may be connected to the input end of the water heater 204 through the water heater circulating water pump 203 and the water purification module 207 .

[0071] When the auxiliary heat source includes a radiator 206 , the fourth valve 303 may be connected to the input end of the radiator 206 via the radiator circulating water pump 205 .

[0072] like Figure 2 As shown, a water circuit temperature sensor of the water heater 204 is provided on the pipeline after the proportional three-way valve 306 connected to the water heater 204 for detecting the water temperature of the water output by the water heater 204 , which represents the water temperature of the water inside the water heater 204 .

[0073] A radiator water circuit temperature sensor 403 is provided on the pipeline at the output end of the radiator 206 for detecting the water temperature of the water output by the radiator 206 , which represents the water temperature of the water inside the radiator 206 .

[0074] Similarly, an outdoor water circuit temperature sensor 401 is also provided on the pipeline after the circulating water pump 201 for detecting the water temperature of the water output by the heat exchanger 103 , which represents the water temperature of the water inside the heat exchanger 103 .

[0075] The water temperature of each circuit is detected by the outdoor water circuit temperature sensor 401, the water heater water circuit temperature sensor 402, and the radiator water circuit temperature sensor 403 to perform antifreeze control.

[0076] In this embodiment, the controller 301 is used to: when the water inside the target heat source is used to perform heat exchange operations on the water in the heat exchanger 103 through the water circulation loop 201, the conduction directions of the first valve 304, the second valve 302, the third valve 301 and the fourth valve 303 in the water circulation loop 201 are set based on the flow path of the water inside the target heat source, and the operation of the circulating water pump 201 is controlled.

[0077] In one implementation, Figure 2 For example, when the target heat source is a water heater 204, the water circulation loop 201 is a water circulation water heater side branch + a water circulation main circuit. Then, according to the structure of the circuit, the conduction direction of the corresponding valve is set. After the valve is set, the circulating water pump (specifically, Figure 2The circulating water pump 201 on the heat exchanger 103 side in the water heater 204 is running. At this time, the water will run according to the water circulation loop 201, and the hot water in the water heater 204 can flow into the heat exchanger 103 and mix with the water in the heat exchanger 103. Since the water temperature in the water heater 204 is relatively high, the hot water therein can increase the temperature of the water in the heat exchanger 103 after mixing with the cold water in the heat exchanger 103, thereby preventing the water in the heat exchanger 103 from freezing.

[0078] Similarly, when the target heat source is the radiator 206, the water circulation loop 201 is a water circulation radiator side branch + a water circulation main circuit. Then, according to the structure of the circuit, the conduction direction of the corresponding valve is set. After the valve is set, the circulating water pump (specifically, Figure 2 The circulating water pump 201 on the heat exchanger 103 side in the heat exchanger 103 is running, and the water will run according to the water circulation loop 201. The hot water in the radiator 206 can flow into the heat exchanger 103 and mix with the water in the heat exchanger 103. Since the water temperature in the radiator 206 is relatively high, the hot water therein can increase the temperature of the water in the heat exchanger 103 after mixing with the cold water in the heat exchanger 103, thereby preventing the water in the heat exchanger 103 from freezing.

[0079] In this embodiment, by setting multiple valves in the water circulation loop 201, the hot water in the water heater 204 and the hot water in the radiator 206 can provide thermal energy to heat the water in the heat exchanger 103 and increase the temperature of the water in the heat exchanger 103, thereby preventing the water in the heat exchanger 103 from freezing.

[0080] Based on any of the above embodiments, Figure 2 The refrigerant heat exchange circuit in the air conditioning water circuit antifreeze control system includes:

[0081] Compressor 101 , reversing valve 102 , electronic expansion valve 104 and air-cooled heat exchange device 105 .

[0082] Among them, Figure 2 As shown, the reversing valve 102 is a four-way reversing valve 102 , and the air-cooled heat exchange device 105 can be an air-cooled heat exchanger 103 .

[0083] The reversing valve 102 is respectively connected to the two ends of the compressor 101, the second water connection end of the heat exchanger 103, and one end of the air-cooled heat exchange device 105; the electronic expansion valve 104 is respectively connected to the first water connection end of the heat exchanger 103 and the other end of the air-cooled heat exchange device 105. Through this connection structure, a refrigerant circulation loop is formed to realize auxiliary antifreeze control of the refrigerant system.

[0084] When performing auxiliary antifreeze control of the refrigerant system, the controller is used to control the second input end of the second valve 302 to be connected with the second output end of the third valve 301 when using the refrigerant to perform heat exchange operation on the water in the heat exchanger 103, control the operation of the compressor 101 and control the operation of the circulating water pump 201.

[0085] Specifically, the auxiliary antifreeze control process of the refrigerant system is:

[0086] When the fluorine-free household air conditioner runs in the antifreeze control mode, the refrigerant system runs in the heating mode. At this time, the heat exchanger 103 is the condenser of the refrigerant system. The refrigerant releases heat to the circulating water. The circulating water only circulates on the outdoor side under the action of the circulating water pump 201 on the heat exchanger 103 side. Among them, the pipeline between the second valve 302 and the third valve 301 is connected, and the water circulation on the outdoor and indoor sides is not connected. At this time, due to the small amount of water in the circulating water circuit, only a small amount of refrigerant heat is required to raise the circulating water temperature to a safe range. The compressor 101 can be controlled to operate in an extreme low-frequency mode to reduce energy consumption. The refrigerant circuit can refer to Figure 2 The refrigerant circulation circuit in the

[0087] In this embodiment, when the antifreeze control of the water heater 204 and the radiator 206 fails, the water circulation between indoor and outdoor is cut off, and only the refrigerant is used to heat the outdoor circulating water. The temperature rises quickly and the energy consumption is low, and the water in the heat exchanger 103 can be prevented from freezing.

[0088] Based on the above-mentioned embodiment of the air conditioning water circuit antifreeze control system, another embodiment of the present application provides an air conditioning water circuit antifreeze control method, which is applied to the controller in the above-mentioned air conditioning water circuit antifreeze control system, referring to Figure 3 , the air conditioning water circuit antifreeze control method comprises:

[0089] S11. When the ambient temperature and the water temperature of the heat exchanger meet the antifreeze control conditions, a target heat source capable of providing heat is selected from the auxiliary heat sources.

[0090] In this embodiment, when the water in the heat exchanger freezes, it is generally when the external environment where the heat exchanger is located is low and the water temperature in the heat exchanger is low.

[0091] Therefore, in one implementation of this embodiment, the ambient temperature and the water temperature of the heat exchanger are detected, wherein the ambient temperature can be detected by a temperature sensor arranged around the heat exchanger, and the water temperature of the heat exchanger can be detected by an outdoor water circuit temperature sensor.

[0092] In actual applications, when the heat exchanger has just stopped running or has been stopped for a short time, the temperature of the water inside the heat exchanger is still relatively high. If the ambient temperature is low but the water temperature inside the heat exchanger is relatively high, the antifreeze control will not be performed. The corresponding antifreeze control operation will only be performed when the ambient temperature and the water temperature of the heat exchanger are less than the corresponding threshold, such as the ambient temperature is less than 1°C and the water temperature of the heat exchanger is less than 2°C.

[0093] At this time, the auxiliary heat sources arranged in the order of use are obtained. Generally, if there are multiple auxiliary heat sources, an arrangement order can be set for each auxiliary heat source, and the auxiliary heat sources are sorted according to the arrangement order, and the target heat source is subsequently selected according to the arrangement order. In one embodiment, if the arrangement order of the auxiliary heat sources is:

[0094] 1. Water heater;

[0095] 2. Radiator.

[0096] Subsequently, if the water heater can be used, the water heater will be used first. If the water heater cannot be used, the radiator will be used for antifreeze control.

[0097] Finally, according to the arrangement order of the auxiliary heat sources, a target heat source whose operating conditions and internal water temperature meet the corresponding requirements is screened out from the auxiliary heat sources.

[0098] Specifically, when selecting an auxiliary heat source, it is necessary to consider the operating conditions of the auxiliary heat source, such as whether it is being used at the time, some limiting conditions set when it is used, etc. In addition, it is also necessary to consider whether the water temperature inside the auxiliary heat source meets the corresponding requirements. Generally, the water temperature in the auxiliary heat source needs to be at a certain temperature so that it can provide heat energy for the water in the heat exchanger.

[0099] It should be noted that if there is only one auxiliary heat source, the operating conditions of the auxiliary heat source and whether the internal water temperature meets the corresponding requirements can be directly analyzed. If so, it will be used as the target heat source. If at least one does not meet the requirements, it is considered that there is no target heat source.

[0100] S12, using the water inside the target heat source to perform heat exchange operation on the water in the heat exchanger through the water circulation loop;

[0101] Specifically, after determining the target heat source, the water circulation loop corresponding to the target heat source can be utilized, and the water from the target heat source can be used to provide heat for the water in the heat exchanger. The two exchange heat, and the water temperature in the heat exchanger increases, reducing the risk of freezing.

[0102] Wherein, in the absence of the target heat source, the refrigerant is used to perform heat exchange operation on the water in the heat exchanger, and the specific implementation process refers to the corresponding description above.

[0103] In this embodiment, when the ambient temperature is low, in order to prevent the water in the heat exchanger from freezing, the water inside the target heat source is used through the water circulation loop to perform heat exchange operations on the water in the heat exchanger, so as to increase the temperature of the water in the heat exchanger and prevent the water in the heat exchanger from freezing. In addition, an auxiliary heat source is provided in the present application, and a suitable target heat source can be selected according to demand to improve the selectivity of the heat source. In addition, in the absence of the target heat source, a refrigerant is used to perform heat exchange operations on the water in the heat exchanger, that is, when the auxiliary heat source cannot be used, the refrigerant can still be used to provide heat to the water in the heat exchanger to prevent the water in the heat exchanger from freezing. From the above, it can be seen that the present application prevents the freezing of water in the heat exchanger by combining the two protection methods of auxiliary heat source and refrigerant, thereby improving the reliability of freezing protection.

[0104] On the basis of any of the above embodiments, according to the arrangement order of the auxiliary heat sources, selecting the target heat sources whose operating conditions and internal water temperatures meet the corresponding requirements from the auxiliary heat sources may include:

[0105] When the first auxiliary heat source in the arrangement order of the auxiliary heat sources is a water heater and the antifreeze enable signal of the water heater is yes, if the water heater is powered by preset electric energy and a reservation use function is set, when the difference between the water temperature of the water heater and the reserved temperature of the water heater is greater than the first temperature difference and the difference between the water temperature of the water heater and the first temperature threshold is greater than the second temperature difference, the water heater is used as the target heat source.

[0106] Specifically, if the auxiliary heat source includes a water heater and a radiator, the water heater is ranked first and the radiator is ranked second.

[0107] At this time, it is prioritized to analyze whether the water heater can be used as an auxiliary heat source. In the specific analysis, first detect whether the antifreeze enable signal of the water heater is yes, specifically, it can be determined whether the auxiliary antifreeze control of the water heater is enabled. If it is enabled, it can be detected whether there is a signal for the water heater to be connected in the system and whether there is a signal allowing the water heater to participate in the antifreeze control. Among them, whether the signal allowing the water heater to participate in the antifreeze control can be a user-defined configuration.

[0108] If so, there is a water heater access signal in the system, which means that the current water heater can supply water normally. If there is a signal allowing the water heater to participate in antifreeze control, it means that the user allows the water heater to provide antifreeze energy. At this time, it is considered that the water heater antifreeze control is enabled.

[0109] After that, it will detect whether the power supply of the water heater is the preset power supply. The preset power supply can be clean energy such as solar energy (with energy-saving and environmental protection characteristics), or valley electricity, free electricity and energy storage. If so, it means that the power supply of the water heater is relatively cheap or free at this time, which can reduce the cost of using the water heater to provide antifreeze energy. If the power supply of the water heater is not the preset power supply, it means that the power supply cost is high at this time, and the user can customize whether to use the mains power to provide heat to the outdoor water channel.

[0110] If the power supply of the water heater is the preset power supply, it means that the power supply cost is low at this time, and it can be further determined whether the user has set a scheduled use function for the water heater. The scheduled use function means that the water heater can be set to provide water at what temperature at each moment.

[0111] If so, the scheduled use function of the water heater is set, there will be a corresponding scheduled temperature of the water heater, which is the required water heater temperature set by the user.

[0112] Afterwards, it will be determined that the difference between the water temperature of the water heater and the preset temperature of the water heater is greater than the first temperature difference, where the first temperature difference can be 3°C. This step determines whether the current water temperature meets the user's preset water temperature requirement. If it does, it means that the water heater can provide the hot water required by the user, and the water heater can perform anti-freeze control. If it does not meet the requirements, the water heater cannot be used for anti-freeze control.

[0113] When the difference between the water temperature of the water heater and the preset temperature of the water heater is greater than the first temperature difference, continue to determine whether the difference between the water temperature of the water heater and the first temperature threshold is greater than the second temperature difference, where the first temperature threshold is A, where A is the user-defined water temperature deviation, the range should be 0-4°C, and the second temperature difference can be 6°C. If it is met, it means that the current water temperature can provide sufficient heat energy for the heat exchanger. If not, the water heater is not allowed to be used for antifreeze control.

[0114] When the difference between the water temperature of the water heater and the preset temperature of the water heater is greater than the first temperature difference and the difference between the water temperature of the water heater and the first temperature threshold is greater than the second temperature difference, the water heater is used as the target heat source.

[0115] When the target heat source is a water heater, based on the flow path of water inside the water heater, the water circulation loop is set to a first conduction path and the operation of the circulating water pump is controlled; in the first conduction path, the input end of the first valve is connected to the output end of the water heater, the output end of the second valve is connected to the first water path connection end of the heat exchanger, the second water path connection end of the heat exchanger is connected to the input end of the third valve through the circulating water pump, and the output end of the fourth valve is connected to the input end of the water heater.

[0116] Specifically, when the water heater is used to provide heat energy, the water heater auxiliary antifreeze control is performed. The implementation process of the water heater auxiliary antifreeze control is:

[0117] The second valve and the third valve both conduct the indoor and outdoor sides, and the connecting water path between the second valve and the third valve is not conducting; the fourth valve only conducts the direction from the buffer water tank to the water heater; the first valve only conducts the direction from the water heater to the outdoor side, and the water in the radiator water path does not participate in the circulation. The proportional three-way valve is used to control the water flow in the antifreeze operation of the water heater.

[0118] like Figure 2 As shown, when the fluorine-free household air conditioner runs in this antifreeze control mode, the refrigerant system remains in standby state. Under the action of the circulating water pump on the heat exchanger side and the circulating water pump of the water heater, the circulating water circulates between the heat exchanger, the buffer water tank and the water heater. The high-temperature circulating water in the water heater provides heat for the outdoor circulating water circuit to prevent freezing.

[0119] In one implementation, if the water heater is powered by preset electric energy and a reservation use function is not set, the water heater is used as a target heat source when the water temperature of the water heater is greater than the set temperature of the water heater and the difference between the water temperature of the water heater and the first temperature threshold is greater than the second temperature difference.

[0120] If the water heater is powered by preset electric energy and the reservation function is not set, it means that the user has not made a reservation for water use. At this time, the water heater generally has a set temperature, which is the water temperature that the water heater needs to maintain. It is judged that the water temperature of the water heater is greater than the set temperature of the water heater. If so, it means that the current water temperature meets the set water temperature requirement of the water heater. Then it is judged that the difference between the water temperature of the water heater and the first temperature threshold is greater than the second temperature difference. The specific judgment process refers to the corresponding description above. If it is satisfied, the water heater can be used as the target heat source to perform the above-mentioned water heater auxiliary antifreeze control.

[0121] After the water in the target heat source is used to perform heat exchange operation on the water in the heat exchanger through the water circulation loop, the method further includes:

[0122] If it is detected that the heat exchange stop condition corresponding to the target heat source is met, the first valve, the second valve, the third valve and the fourth valve are controlled to be closed to stop using the water inside the target heat source through the water circulation loop to perform heat exchange operations on the water in the heat exchanger.

[0123] Specifically, when the target heat source is a water heater and the reservation function is turned on, if it is detected that the user has not used the domestic hot water in the water heater, but the water temperature in the water heater is not greater than the reserved temperature of the water heater or is not greater than 6+B℃, where B is the user-defined water temperature deviation, and the range should be -2-0℃, then it means that the current water temperature in the water heater does not meet the requirements, and the water heater is no longer allowed to continue to supply heat.

[0124] If the water temperature in the water heater is greater than the preset temperature of the water heater and greater than 6+B℃, but the outdoor water temperature is greater than 6℃, it means that the water temperature in the current heat exchanger is high and the water does not have the risk of freezing. At this time, the antifreeze control is exited.

[0125] It should be noted that if the ambient temperature is detected to be greater than 4°C during the antifreeze control process, it means that the current external ambient temperature is relatively high and the water does not have a risk of freezing, so the antifreeze control is directly exited.

[0126] The heat exchange stop condition in the above embodiment is that the water temperature in the water heater is not greater than the preset temperature of the water heater or is not greater than 6+B°C, or the outdoor water temperature is greater than 6°C. At this time, the first valve, the second valve, the third valve and the fourth valve can be controlled to be closed, and the water heater stops providing heat.

[0127] In another implementation method, if it is detected that the user is using domestic hot water in the water heater, part of the water in the water heater needs to be supplied to the user, and part needs to be supplied to the heat exchanger, then water flow control can be performed. During water flow control, the flow of the user's hot water and antifreeze water is controlled by the proportional three-way valve connected to the water heater. During operation, it is regulated according to the opening or flow of the mixing valve on the user side. The maximum proportional opening of the antifreeze water three-way valve is 50% and the minimum is 20%.

[0128] In another implementation, when the target heat source is a water heater and the reservation function is not enabled, if the water temperature of the water heater is not greater than the water heater set temperature + 3°C, it means that the water temperature of the water heater does not meet the user's set temperature, and the water heater is no longer used as the target heat source. Or if the water temperature of the water heater is not greater than 6+B°C, it means that the water temperature of the water heater is low and cannot provide enough heat for the heat exchanger, and the water heater is no longer used as the target heat source.

[0129] If the water temperature of the water heater is greater than the water heater set temperature + 3°C and the water temperature of the water heater is greater than 6+B°C, it means that the water temperature in the water heater meets the user's needs and meets the heat exchange energy supply needs. When the outdoor water temperature is greater than 6°C, the antifreeze control is exited. For the specific implementation process, refer to the above corresponding instructions.

[0130] The heat exchange stopping condition in the above embodiment is that the water temperature in the water heater in this embodiment is not greater than the set temperature of the water heater or is not greater than 6+B°C, or the outdoor water temperature is greater than 6°C.

[0131] It should be noted that after the water heater stops providing heat, antifreeze control is still required, and it is further determined whether the radiator can provide heat. If so, the radiator is used to provide heat for the water in the heat exchanger to prevent the water in the heat exchanger from freezing.

[0132] In one implementation, the above embodiment uses a water heater as a target heat source. In addition, a radiator may also be used as a target heat source. At this time, selecting a target heat source whose operating conditions and internal water temperature meet corresponding requirements from the auxiliary heat sources may include:

[0133] When the first auxiliary heat source in the arrangement order of the auxiliary heat sources is a water heater, the second auxiliary heat source is a radiator, the antifreeze enable signal of the water heater is no, and the antifreeze enable signal of the radiator is yes, if the radiator operates in the temperature control mode, the radiator is used as the target heat source when the difference between the water temperature of the radiator and the first temperature threshold is greater than the second temperature difference, the difference between the room temperature and the radiator set temperature is greater than the third temperature difference, and the difference between the water temperature of the radiator and the room temperature is greater than the fourth temperature difference.

[0134] Specifically, when the first auxiliary heat source in the arrangement order of the auxiliary heat sources is a water heater and the second auxiliary heat source is a radiator, if the antifreeze enable signal of the water heater is no, it means that the water heater is not allowed to provide antifreeze heat at this time, but the antifreeze enable signal of the radiator is yes, it means that the radiator is allowed to provide antifreeze heat, then it is further determined whether the radiator is allowed to be used as the target heat source based on the operating conditions of the radiator and the water temperature.

[0135] In one implementation, if the radiator operates in a temperature control mode, that is, the radiator needs to maintain a certain temperature, the difference between the water temperature of the radiator and the first temperature threshold (such as A) must be greater than the second temperature difference (6°C), which means that the current water temperature of the radiator can provide more heat energy and meet the heat exchange requirements.

[0136] In addition, the difference between the room temperature and the radiator set temperature must be greater than the third temperature difference, that is, the radiator needs to satisfy the current temperature provided, that is, the room temperature, which is greater than the radiator set temperature to meet the user's heat demand.

[0137] In addition, it is also necessary to satisfy that the difference between the water temperature of the radiator and the room temperature is greater than a fourth temperature difference (2°C). The water temperature of the radiator is the value detected by the above-mentioned radiator water circuit temperature sensor. The difference between the water temperature of the radiator and the room temperature is greater than the fourth temperature difference, indicating that the current water temperature is relatively high and can maintain the room temperature for a short time. Then, the water temperature of the radiator can be used to provide heat exchange energy for the heat exchanger.

[0138] If the radiator operates in temperature control mode, the radiator is used as a target heat source when the difference between the water temperature of the radiator and the first temperature threshold is greater than the second temperature difference, the difference between the room temperature and the radiator set temperature is greater than the third temperature difference, and the difference between the water temperature of the radiator and the room temperature is greater than the fourth temperature difference.

[0139] It should be noted that if any temperature does not meet the conditions, it means that the radiator cannot be used as the target heat source. At this time, if there is no other auxiliary heat source, the refrigerant can be used for heat exchange. If there is other auxiliary heat source, it is further determined whether the other auxiliary heat source meets the target heat source requirements.

[0140] In another implementation, if the radiator is not operating in the temperature control mode, it means that the radiator is not needed to provide the heat required by the user at this time. If the difference between the radiator water temperature and the first temperature threshold (such as A) is greater than the second temperature difference (6°C), it means that the radiator can provide more heat for heat exchange, and the radiator is used as the target heat source.

[0141] After taking the radiator as the target heat source, radiator auxiliary antifreeze control can be performed.

[0142] At this time, when the target heat source is a radiator, based on the flow path of water inside the radiator, the water circulation loop is set to a second conduction path and the operation of the circulating water pump is controlled; in the second conduction path, the input end of the first valve is connected to the output end of the radiator, the output end of the second valve is connected to the first water path connection end of the heat exchanger, the second water path connection end of the heat exchanger is connected to the input end of the third valve through the circulating water pump, and the output end of the fourth valve is connected to the input end of the radiator.

[0143] Specifically, the radiator auxiliary antifreeze control process is:

[0144] The second valve and the third valve both conduct electricity to the indoor and outdoor sides, the connecting water circuit between the second valve and the third valve is not conducting, the fourth valve only conducts electricity from the buffer water tank to the radiator, the first valve only conducts electricity from the radiator to the outdoor side, and the water in the water circuit of the water heater does not participate in the circulation.

[0145] At this time, when the fluorine-free household air conditioner runs this antifreeze control mode, the refrigerant system remains in standby state, and the circulating water circulates between the heat exchanger, the buffer water tank, and the radiator under the action of the circulating water pump on the heat exchanger side and the radiator circulating water pump. The high-temperature circulating water in the radiator provides heat for the outdoor circulating water circuit to prevent freezing.

[0146] Similarly, in this antifreeze control mode, if it is detected that the heat exchange stop condition corresponding to the target heat source is met, the first valve, the second valve, the third valve and the fourth valve are controlled to be closed to stop using the water inside the target heat source through the water circulation loop to perform heat exchange operations on the water in the heat exchanger.

[0147] Specifically, when the target heat source is a radiator and operates in temperature control mode, if the room temperature is not greater than the set temperature of the radiator, it means that the current room temperature does not meet the temperature required by the user, and the radiator is needed to provide energy to provide the room temperature; or, the water temperature is not greater than the room temperature, which means that the current water temperature is low and will reversely absorb the room temperature and do not meet the user's heat dissipation requirements for the radiator; or, when the radiator water temperature is not greater than 6+B℃, it means that the current radiator water temperature is low and is insufficient to provide the required heat exchange energy for the heat exchanger, then stop using the radiator as the target heat source.

[0148] In addition, if the room temperature is greater than the radiator set temperature, the water temperature is greater than the room temperature, and the radiator water temperature is greater than 6+B℃, but the outdoor water temperature is greater than 6℃, it means that the current heat exchanger water temperature is high, no heat exchange is required and there is no risk of freezing, then the antifreeze control is exited.

[0149] The heat exchange stop condition in the above embodiment is that the room temperature is not greater than the radiator set temperature, the water temperature is not greater than the room temperature, and the radiator water temperature is not greater than 6+B°C, or the outdoor water temperature is greater than 6°C. At this time, the first valve, the second valve, the third valve and the fourth valve are controlled to be closed, and the radiator stops providing heat energy.

[0150] When the target heat source is a radiator and is not operating in the temperature control mode, at this time, if the radiator water temperature is not greater than 6+B℃, or the outdoor water temperature is greater than 6℃, it means that the heat exchange stop condition is met. At this time, the first valve, the second valve, the third valve and the fourth valve are controlled to be closed, and the radiator stops providing heat energy.

[0151] It should be noted that when the radiator water temperature is not greater than 6+B℃, it means that the radiator cannot provide sufficient heat for heat exchange. If there is no other auxiliary heat source, refrigerant is used for antifreeze heat exchange control.

[0152] If the outdoor water temperature is greater than 6°C, it means that the current water temperature of the heat exchanger is high, no heat exchange is required and there is no risk of freezing, so the antifreeze control is exited.

[0153] In one implementation, if neither the water heater nor the radiator can be used as the target heat source, the refrigerant is used to perform heat exchange operations on the water in the heat exchanger. Specifically, the second input end of the second valve is controlled to be connected to the second output end of the third valve, the compressor is controlled to operate, and the circulating water pump is controlled to operate, so as to use the refrigerant to perform heat exchange operations on the water in the heat exchanger. The specific implementation process refers to the corresponding instructions above.

[0154] In this embodiment, the water heater, radiator and refrigerant system are linked to realize anti-freeze control, so that heat input is kept in the outdoor water circuit at all times, ensuring that fluorine does not enter the house and the outdoor circulating water of the air conditioner does not freeze in a low temperature environment, which is safe, reliable and more flexible.

[0155] When the antifreeze control of the water heater and radiator fails, the water circulation between indoor and outdoor is cut off, and only the circulating water on the outdoor side is heated, which heats up quickly and consumes less energy.

[0156] Based on any of the above embodiments, another embodiment of the present application provides a complete air conditioning water circuit antifreeze control method, referring to Figure 4 , the antifreeze control logic may include the following steps:

[0157] Step 101-detect whether the antifreeze control is enabled; if so, execute step 102; if not, execute step 103.

[0158] The user determines whether to set the autonomous antifreeze control in the standby mode according to the needs. If it is set, it is considered that the antifreeze control is enabled. If not, it is considered that the antifreeze control is not enabled.

[0159] Step 102 - enter antifreeze control detection.

[0160] Among them, users can customize whether to use standby antifreeze control. When it is turned off, when the detected ambient temperature is lower than 1°C and the outdoor water temperature is lower than 2°C, the user is prompted to drain the water manually;

[0161] Step 103 - Check whether the ambient temperature is lower than 1°C; if so, execute step 104; if not, execute step 105.

[0162] Step 104 - Check whether the outdoor water temperature is lower than 2°C; if so, execute step 201; if not, execute step 105.

[0163] Step 105: Enter standby mode.

[0164] Specifically, when the above 103 and 104 conditions are both met, there is a risk of freezing of the waterway, and the anti-freezing operation is entered, otherwise the standby mode is maintained.

[0165] Step 106: Check whether the ambient temperature is lower than 1°C;

[0166] Step 107-check whether the outdoor water temperature is lower than 2°C. When the above 106 and 107 conditions are met, there is a risk of water freezing, and the water freezing prompt is turned on.

[0167] Step 108 - prompt the user to drain the water manually in the form of a pop-up window on the screen and a buzzer.

[0168] Step 201 - detect whether the auxiliary antifreeze control of the water heater is enabled, if so, execute step 202; if not, execute step 301.

[0169] Whether it is enabled can be determined by detecting whether there is a signal that a water heater is connected and whether the water heater is allowed to participate in antifreeze control. The user can customize it.

[0170] Step 202 - detect whether clean energy such as solar energy is connected to power the water heater; if so, execute step 204; if not, execute step 203.

[0171] In addition, it is also possible to detect whether there is off-peak electricity, free electricity, energy storage and other energy access to power the water heater.

[0172] Step 203: When there is no clean energy access, the user defines whether to use the mains electricity to provide heat to the outdoor water channel;

[0173] Step 204 - determine whether the water heater has the scheduled use function turned on; if so, execute step 205; if not, execute step 213.

[0174] Step 205 - determine whether the water temperature of the water heater is greater than the reserved water temperature + 3°C; if so, execute step 206; if not, execute step 301.

[0175] Step 206: Determine whether the water temperature of the water heater is greater than 6+A°C, where A is the user-defined water temperature deviation, which should range from 0 to 4°C;

[0176] Step 207: Run the water heater antifreeze control. For the specific process, see the above water heater auxiliary antifreeze control;

[0177] Step 208-determine whether the user uses domestic hot water, that is, determine whether the water heater mixing valve is open;

[0178] Step 209: After turning on the auxiliary antifreeze control of the water heater, check whether the water temperature of the water heater is greater than the preset temperature;

[0179] Step 210: After turning on the auxiliary antifreeze control of the water heater, check whether the water temperature of the water heater is greater than 6+B℃, where B is the user-defined water temperature deviation, which should range from -2 to 0℃;

[0180] Step 211-determine whether the outdoor water temperature is greater than 6°C. If not, continue the water heater auxiliary antifreeze control; if reached, execute step 501.

[0181] Step 212 - Run water flow control.

[0182] Among them, after the user uses the domestic water in the water heater, the flow of the user's hot water and antifreeze water is controlled by the water heater three-way valve. During operation, it is regulated according to the opening or flow of the mixing valve on the user side. The maximum proportional opening of the antifreeze water three-way valve is 50% and the minimum is 20%.

[0183] Step 213: Determine whether the water temperature of the water heater is greater than the set temperature of the water heater;

[0184] Step 214: Determine whether the water temperature of the water heater is greater than 6+A°C, where A is the user-defined water temperature deviation, which should range from 0 to 4°C;

[0185] Step 215: Run the water heater antifreeze control. For the specific process, see the above water heater auxiliary antifreeze control;

[0186] Step 216: Determine whether the user uses domestic hot water, that is, determine whether the water heater mixing valve is open; if so, execute step 213; if not, execute step 217;

[0187] Step 217: Determine whether the water temperature of the water heater is greater than the set temperature of the water heater + 3°C;

[0188] Step 218: After turning on the auxiliary antifreeze control of the water heater, check whether the water temperature of the water heater is greater than 6+B℃, where B is the user-defined water temperature deviation, which should range from -2 to 0℃;

[0189] Step 219: Determine whether the outdoor water temperature is greater than 6°C. If not, continue the water heater auxiliary antifreeze control;

[0190] Step 301: Detect whether the radiator auxiliary antifreeze control is enabled;

[0191] Whether to enable or not can be determined by judging whether the detection signal contains a signal that the radiator is connected and whether the radiator is allowed to participate in the antifreeze control signal, which can be customized by the user.

[0192] Step 302 - determine whether the user needs temperature control; if so, execute step 303; if not, execute step 311.

[0193] Among them, users can customize whether the room needs temperature control, and can also use human sensors and other means to detect whether there are people in the room. If there are people, it is judged that temperature control is needed, and if there are no people, it is judged that temperature control is not needed;

[0194] Step 303 - determine whether the indoor temperature is greater than the indoor temperature setting target value (radiator setting temperature) + 1°C, and the target value is set by the user;

[0195] Step 304: Determine whether the water temperature in the radiator is greater than room temperature + 2°C;

[0196] Step 305: Determine whether the water temperature in the radiator is greater than 6+A°C, where A is the user-defined water temperature deviation, which should range from 0 to 4°C;

[0197] Step 306: Run the radiator antifreeze control. For the specific process, see the above radiator auxiliary antifreeze control;

[0198] Step 307: Determine whether the room temperature is greater than the indoor temperature setting target value (radiator setting temperature);

[0199] Step 308: Determine whether the water temperature in the radiator is greater than the room temperature;

[0200] Step 309 - after turning on the auxiliary antifreeze control of the radiator, check whether the radiator water temperature is greater than 6+B℃, where B is the user-defined water temperature deviation, which should range from -2 to 0℃;

[0201] Step 310 - Determine whether the outdoor water temperature is greater than 6°C. If not, continue the water heater auxiliary antifreeze control; if reached, execute step 501.

[0202] Step 311: Determine whether the water temperature in the radiator is greater than 6+A°C, where A is the user-defined water temperature deviation, which should range from 0 to 4°C;

[0203] Step 312: Run the radiator antifreeze control. For the specific process, see the above radiator auxiliary antifreeze control;

[0204] Step 313: After turning on the auxiliary antifreeze control of the radiator, check whether the radiator water temperature is greater than 6+B°C, where B is the user-defined water temperature deviation, which should range from -2 to 0°C;

[0205] In this embodiment, when the radiator operates in the indoor non-temperature control mode, it is only necessary to determine whether the radiator water temperature can provide the thermal energy required to meet the auxiliary antifreeze control of the radiator.

[0206] Step 314 - Determine whether the outdoor water temperature is greater than 6°C. If not, continue the water heater auxiliary antifreeze control; if reached, execute step 501.

[0207] Step 401 - auxiliary antifreeze control of the refrigerant system.

[0208] Among them, the auxiliary antifreeze control of the refrigerant system is the final means, and there is no need to determine the enable signal. That is, when the auxiliary antifreeze control of the water heater and the auxiliary antifreeze control of the radiator are both invalid, the auxiliary antifreeze control of the refrigerant system is directly operated until the outdoor water temperature is higher than 6°C, and the antifreeze control is exited. The specific process is shown in the above auxiliary antifreeze control of the refrigerant system;

[0209] Step 501: If the ambient temperature rises above 4°C during the antifreeze control process, the antifreeze control will be exited directly.

[0210] It should be noted that after exiting the antifreeze control in any state, it is necessary to maintain the ambient temperature and outdoor water temperature detection, and re-enter the antifreeze control when the conditions are met.

[0211] In this embodiment, through the above steps, it can be ensured that in a low temperature environment, fluorine does not enter the air conditioner water circuit in standby mode and there is no freezing, thereby improving the stability and safety of the system.

[0212] The present application also provides an electronic device for implementing the above-mentioned air conditioning water circuit antifreeze control method. Figure 5 As shown, it shows a schematic diagram of the structure of an electronic device suitable for implementing the embodiment of the present application. The electronic device in the embodiment of the present application may include but is not limited to a fixed terminal such as the above-mentioned controller, mobile phone, notebook computer, PDA (personal digital assistant), PAD (tablet computer), desktop computer, etc. Figure 5 The electronic device shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0213] like Figure 5 As shown, the electronic device may include a processing device (e.g., a central processing unit, a graphics processing unit, etc.) 601, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 602 or a program loaded from a storage device 608 to a random access memory (RAM) 603. When the electronic device is powered on, various programs and data required for the operation of the electronic device are also stored in the RAM 603. The processing device 601, the ROM 602, and the RAM 603 are connected to each other via a bus 604. An input / output (I / O) interface 605 is also connected to the bus 604.

[0214] Typically, the following devices may be connected to the I / O interface 605: an input device 606 including, for example, a touch screen, a touch pad, a keyboard, a mouse, a camera, a microphone, an accelerometer, a gyroscope, etc.; an output device 607 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; a storage device 608 including, for example, a memory card, a hard disk, etc.; and a communication device 609. The communication device 609 may allow the electronic device to communicate with other devices wirelessly or by wire to exchange data. Although Figure 5 An electronic device having various devices is shown, but it should be understood that it is not required to implement or possess all the devices shown. More or fewer devices may be implemented or possessed instead.

[0215] Also provided in an embodiment of the present application is a computer program product including computer-readable instructions. When the computer-readable instructions are executed on an electronic device, the electronic device implements any one of the air conditioning water circuit antifreeze control methods provided in the embodiments of the present application.

[0216] A computer-readable storage medium is also provided in an embodiment of the present application. The storage medium carries one or more computer programs. When the one or more computer programs are executed by an electronic device, the electronic device can implement any one of the air conditioning water circuit antifreeze control methods provided in the embodiment of the present application.

[0217] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An air conditioning water circuit antifreeze control system, characterized in that: include: Auxiliary heat source, water circulation loop and controller; The output end of each auxiliary heat source is connected to the input end of the water circulation loop, and the output end of the water circulation loop is connected to the input end of each auxiliary heat source; the heat exchanger arranged outdoors is located in the water circulation loop; The controller is used to select a target heat source that can provide heat from the auxiliary heat sources when the ambient temperature and the water temperature of the heat exchanger meet the antifreeze control conditions, and use the water inside the target heat source to perform heat exchange operations on the water in the heat exchanger through the water circulation loop; wherein, in the absence of the target heat source, the refrigerant is used to perform heat exchange operations on the water in the heat exchanger.

2. The air conditioning water circuit antifreeze control system according to claim 1, characterized in that: The auxiliary heat source is multiple; the water circulation loop includes: The first valve, the second valve, the circulating water pump, the third valve, the buffer water tank and the fourth valve; The input end of the first valve is connected to the output end of each of the auxiliary heat sources respectively; the output end of the first valve is connected to the first input end of the second valve, the output end of the second valve is connected to the first water channel connection end of the heat exchanger, the second water channel connection end of the heat exchanger is connected to the input end of the third valve through the circulating water pump, the first output end of the third valve is connected to the input end of the fourth valve through the buffer water tank, and the output end of the fourth valve is connected to the input end of each of the auxiliary heat sources respectively; the second input end of the second valve is connected to the second output end of the third valve; The controller is used to set the conduction directions of the first valve, the second valve, the third valve and the fourth valve in the water circulation loop based on the flow path of the water inside the target heat source when performing heat exchange operations on the water in the heat exchanger through the water circulation loop, and control the operation of the circulating water pump.

3. The air conditioning water circuit antifreeze control system according to claim 2, characterized in that: The refrigerant heat exchange circuit in the air conditioning water circuit antifreeze control system includes: Compressor, reversing valve, electronic expansion valve and air-cooled heat exchange device; The reversing valve is respectively connected to the two ends of the compressor, the second water path connection end of the heat exchanger, and one end of the air-cooled heat exchange device; the electronic expansion valve is respectively connected to the first water path connection end of the heat exchanger and the other end of the air-cooled heat exchange device; The controller is used to control the second input end of the second valve to be connected with the second output end of the third valve when the refrigerant is used to perform heat exchange operation on the water in the heat exchanger, control the operation of the compressor, and control the operation of the circulating water pump.

4. The air conditioning water circuit antifreeze control system according to claim 1, characterized in that: The auxiliary heat source includes a water heater and a radiator.

5. An air conditioning water circuit antifreeze control method, characterized in that: A controller used in an air conditioning water circuit antifreeze control system according to any one of claims 1 to 4, wherein the air conditioning water circuit antifreeze control method comprises: When the ambient temperature and the water temperature of the heat exchanger meet the antifreeze control condition, a target heat source capable of providing heat is selected from the auxiliary heat sources; The water in the target heat source is used through the water circulation loop to perform heat exchange operation on the water in the heat exchanger; wherein, in the absence of the target heat source, the refrigerant is used to perform heat exchange operation on the water in the heat exchanger.

6. The air conditioning water circuit antifreeze control method according to claim 5, characterized in that: When the ambient temperature and the water temperature of the heat exchanger meet the antifreeze control conditions, a target heat source capable of providing heat is selected from the auxiliary heat sources, including: Detecting the ambient temperature and the water temperature of the heat exchanger; When the ambient temperature and the water temperature of the heat exchanger are less than corresponding thresholds, obtaining auxiliary heat sources arranged in order of use; According to the arrangement order of the auxiliary heat sources, a target heat source whose operating conditions and internal water temperature meet corresponding requirements is screened out from the auxiliary heat sources.

7. The air conditioning water circuit antifreeze control method according to claim 6, characterized in that: According to the arrangement order of the auxiliary heat sources, target heat sources whose operating conditions and internal water temperatures meet corresponding requirements are selected from the auxiliary heat sources, including: When the first auxiliary heat source in the arrangement sequence of the auxiliary heat sources is a water heater and the antifreeze enable signal of the water heater is yes, if the water heater is powered by preset electric energy and a reservation use function is set, when the difference between the water temperature of the water heater and the reserved temperature of the water heater is greater than the first temperature difference and the difference between the water temperature of the water heater and the first temperature threshold is greater than the second temperature difference, the water heater is used as the target heat source; If the water heater is powered by preset electric energy and the reservation function is not set, when the water temperature of the water heater is greater than the set temperature of the water heater and the difference between the water temperature of the water heater and the first temperature threshold is greater than the second temperature difference, the water heater is used as the target heat source; In the case where the first auxiliary heat source in the arrangement sequence of the auxiliary heat sources is a water heater, the second auxiliary heat source is a radiator, the antifreeze enable signal of the water heater is no and the antifreeze enable signal of the radiator is yes, if the radiator operates in a temperature control mode, the radiator is used as a target heat source when the difference between the water temperature of the radiator and the first temperature threshold is greater than the second temperature difference, the difference between the room temperature and the set temperature of the radiator is greater than the third temperature difference, and the difference between the water temperature of the radiator and the room temperature is greater than the fourth temperature difference; If the radiator is not operating in the temperature control mode, when the difference between the radiator water temperature and the first temperature threshold is greater than the second temperature difference, the radiator is used as a target heat source.

8. The air conditioning water circuit antifreeze control method according to any one of claims 5 to 7, characterized in that: The water in the target heat source is used to perform heat exchange operation on the water in the heat exchanger through the water circulation loop, including: In the case where the target heat source is a water heater, based on the flow path of water inside the water heater, the water circulation loop is set as a first conduction path and the operation of a circulating water pump is controlled; in the first conduction path, an input end of a first valve is connected to an output end of the water heater, an output end of a second valve is connected to a first water path connection end of the heat exchanger, a second water path connection end of the heat exchanger is connected to an input end of a third valve through a circulating water pump, and an output end of a fourth valve is connected to an input end of the water heater; When the target heat source is a radiator, based on the flow path of water inside the radiator, the water circulation loop is set to a second conduction path and the operation of a circulating water pump is controlled; in the second conduction path, the input end of the first valve is connected to the output end of the radiator, the output end of the second valve is connected to the first water path connection end of the heat exchanger, the second water path connection end of the heat exchanger is connected to the input end of the third valve through the circulating water pump, and the output end of the fourth valve is connected to the input end of the radiator.

9. The air conditioning water circuit antifreeze control method according to claim 5, characterized in that: After the water in the target heat source is used to perform heat exchange operation on the water in the heat exchanger through the water circulation loop, the method further includes: If it is detected that the heat exchange stop condition corresponding to the target heat source is met, the first valve, the second valve, the third valve and the fourth valve are controlled to be closed to stop using the water inside the target heat source through the water circulation loop to perform heat exchange operations on the water in the heat exchanger.

10. The air conditioning water circuit antifreeze control method according to claim 5, characterized in that: The heat exchange operation of the water in the heat exchanger is performed by using a refrigerant, including: The second input end of the second valve is controlled to be connected to the second output end of the third valve, and the operation of the compressor and the circulating water pump are controlled to perform heat exchange operation on the water in the heat exchanger using the refrigerant.

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