Control method and device for air conditioning system, air conditioning system and computer readable storage medium

Abstract

The invention relates to the technical field of refrigeration equipment, and discloses a control method for an air conditioning system, which comprises the following steps: when the air conditioning system operates in a heating mode, obtaining a frosting state of a third heat exchanger; under the condition that the frosting state of the third heat exchanger shows that the third heat exchanger is frosted, the water temperature value of the heat storage device is obtained; and according to the corresponding relation between the water temperature value of the heat storage device and the heat storage condition, the heat storage pipeline is controlled to be connected or disconnected, and the bypass pipeline is controlled to be connected or disconnected so that the heat storage device and / or the first heat exchanger can be selected to execute defrosting operation on the third heat exchanger. According to the air conditioning system, the outdoor heat exchanger can be defrosted on the basis of not sacrificing the running frequency of the compressor, the influence of frequency rising of the compressor on the energy consumption of the air conditioning system is reduced, and energy is saved. The invention further discloses a control device for the air conditioning system, the air conditioning system and a computer readable storage medium.

Description

Technical Field

[0001] The present application relates to the technical field of refrigeration equipment, for example, to a control method and device for an air-conditioning system, an air-conditioning system, and a computer-readable storage medium. Background Art

[0002] Currently, with the rapid development of science and technology, people use air conditioners more and more frequently. When the air conditioner operates in the heating mode, the outdoor unit of the air conditioner is prone to frosting.

[0003] To solve the frosting problem of the outdoor unit of the air conditioner, related technologies disclose a method for controlling an air conditioner. The air conditioner includes a refrigerant circulation system and a water circulation system. The refrigerant circulation system includes a compressor, a first heat exchanger, a second heat exchanger, an electronic expansion valve, and a third heat exchanger connected in series in sequence. The second heat exchanger includes a refrigerant pipeline and a water pipeline for heat exchange. The water circulation system includes a parallel connection of a fan coil unit, an expansion tank, and a water pump connected in sequence. The outlet of the water pump is connected to the inlet of the water pipeline of the second heat exchanger, and the inlet of the fan coil unit is connected to the outlet of the water pipeline of the second heat exchanger. The method includes: determining whether the air conditioner is frosting according to the suction pressure of the compressor and the surface temperature of the third heat exchanger; controlling the power of the water pump, and / or, the frequency of the compressor and the opening degree of the electronic expansion valve according to whether the air conditioner is frosting. This method configures three heat exchangers in the refrigerant circulation system, and heat exchange is performed in the second heat exchanger by setting the refrigerant circulation system and the water circulation system. The heat discharged from the compressor is provided to the second heat exchanger and then provided to the water circulation system for defrosting. The above defrosting overload does not require switching the four-way valve to stop the machine, and the energy source required for defrosting is the compressor and wind power, which is beneficial to improving the defrosting effect and realizing frost-free operation of the air conditioner.

[0004] In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in related technologies:

[0005] Related technologies use the heat discharged from the compressor to defrost the water circulation system, that is, most of the heat required for defrosting comes from the compressor. In the case of severe frosting conditions of the air conditioner, related technologies need to increase the frequency of the compressor to achieve rapid defrosting. In this way, the system energy efficiency of the air conditioner is increased, resulting in energy waste.

[0006] It should be noted that the information disclosed in the above background art section is only used to strengthen the understanding of the background of the present application, and therefore may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention

[0007] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not a comprehensive review, nor is it intended to identify key / important elements or delineate the scope of protection of these embodiments. Instead, it serves as a prelude to the detailed description that follows.

[0008] Embodiments of the present disclosure provide a control method and device for an air-conditioning system, an air-conditioning system, and a computer-readable storage medium, so as to perform a defrosting operation on an outdoor heat exchanger without sacrificing the operating frequency of the compressor, reduce the impact of compressor frequency increase on the energy consumption of the air-conditioning system, and save energy.

[0009] In some embodiments, the air-conditioning system includes a refrigerant circulation pipeline, a bypass pipeline, and a heat storage pipeline. The refrigerant circulation pipeline includes a compressor, a first heat exchanger, and a third heat exchanger connected in series through pipelines in sequence. The first heat exchanger is installed indoors, and the third heat exchanger is installed outdoors. The bypass pipeline is configured to connect the first heat exchanger and the third heat exchanger in parallel, and the heat storage pipeline is connected in parallel with the third heat exchanger. The heat storage pipeline includes a heat storage device, and a medium for storing heat is contained in the heat storage device. The method includes: when the air-conditioning system operates in a heating mode, obtaining the frosting state of the third heat exchanger; when the frosting state of the third heat exchanger indicates that the third heat exchanger is frosted, obtaining the water temperature value of the heat storage device; according to the correspondence between the water temperature value of the heat storage device and the heat storage condition, controlling the heat storage pipeline to be conducted or cut off, and controlling the bypass pipeline to be conducted or cut off to select to use the heat storage device and / or the first heat exchanger to perform a defrosting operation on the third heat exchanger.

[0010] In some embodiments, according to the correspondence between the water temperature value of the heat storage device and the heat storage condition, controlling the heat storage pipeline to be conducted or cut off, and controlling the bypass pipeline to be conducted or cut off to select to use the heat storage device and / or the first heat exchanger to perform a defrosting operation on the third heat exchanger includes: when the water temperature value of the heat storage device meets the heat storage start condition, controlling the heat storage pipeline to be conducted to use the heat storage device to perform a defrosting operation on the third heat exchanger.

[0011] In some embodiments, it further includes: after controlling the heat storage pipeline to be conducted to use the heat storage device to perform a defrosting operation on the third heat exchanger, when the water temperature value of the heat storage device meets the heat storage switching condition, controlling the bypass pipeline to be conducted to connect the first heat exchanger and the third heat exchanger, and controlling the heat storage pipeline to continue to be conducted to simultaneously use the first heat exchanger and the heat storage device to perform a defrosting operation on the third heat exchanger.

[0012] In some embodiments, the heat storage conditions include a heat storage start condition and a heat storage switching condition. The water temperature value of the heat storage device is determined to meet the heat storage conditions in the following manner: when the air-conditioning system operates in the heating mode, obtain the heat exchanger surface temperature of the third heat exchanger; determine the sum value of the heat exchanger surface temperature and the first temperature deviation value as the first temperature reference value; determine the sum value of the heat exchanger surface temperature and the second temperature deviation value as the second temperature reference value; wherein, the second temperature deviation value is less than the first temperature deviation value; when the water temperature value is greater than or equal to the first temperature reference value, determine that the water temperature value of the heat storage device meets the heat storage start condition; when the water temperature value is less than or equal to the second temperature reference value, determine that the water temperature value of the heat storage device meets the heat storage conversion condition.

[0013] In some embodiments, it further includes: controlling the bypass pipeline to be conducted so that the first heat exchanger is connected to the third heat exchanger, and controlling the heat storage pipeline to be continuously conducted to simultaneously use the first heat exchanger and the heat storage device to perform a defrosting operation on the third heat exchanger, and then obtain a new water temperature value of the heat storage device again; when the new water temperature value meets the heat storage exit condition, control the heat storage pipeline to be cut off to stop the heat storage device from performing the defrosting operation on the third heat exchanger; control the bypass pipeline to be continuously conducted so that the first heat exchanger is continuously connected to the third heat exchanger to continue performing the defrosting operation on the third heat exchanger by using the first heat exchanger.

[0014] In some embodiments, it further includes: after controlling the heat storage pipeline to be cut off to stop the heat storage device from performing the defrosting operation on the third heat exchanger, controlling the heat storage device to perform a heat storage operation; wherein, performing the heat storage operation includes: storing the waste heat of the first heat exchanger; and / or, storing the heat provided by a heat source other than the air-conditioning system.

[0015] Optionally, the heat storage conditions further include a heat storage exit condition. The water temperature value of the heat storage device is determined to meet the heat storage exit condition in the following manner: when the air-conditioning system operates in the heating mode, obtain the heat exchanger surface temperature of the third heat exchanger; determine the sum value of the heat exchanger temperature value and the third temperature deviation value as the third temperature reference value; when the new water temperature value is less than or equal to the third temperature reference value, determine that the water temperature value of the heat storage device meets the heat storage exit condition.

[0016] Optionally, obtaining the frosting state of the third heat exchanger includes: when the air-conditioning system operates in the heating mode, obtain the compressor suction pressure and the heat exchanger surface temperature of the third heat exchanger; according to the compressor suction pressure, determine the saturation temperature corresponding to the compressor suction pressure; when the saturation temperature is less than the temperature threshold and the heat exchanger surface temperature is less than zero, determine that the third heat exchanger is in the frosting state.

[0017] In some embodiments, the device includes a processor and a memory storing program instructions, and the processor is configured to execute the control method for the air-conditioning system as described above when running the program instructions.

[0018] In some embodiments, the air-conditioning system includes: a refrigerant circulation pipeline, including a compressor, a first heat exchanger and a third heat exchanger connected in series through the pipeline, the first heat exchanger is installed indoors, and the third heat exchanger is installed outdoors; a bypass pipeline, constructed to connect the first heat exchanger and the third heat exchanger in parallel; a heat storage pipeline, connected in parallel with the third heat exchanger, the heat storage pipeline including a heat storage device, and the heat storage device contains a medium for storing heat.

[0019] In some embodiments, the heat exchanger type of the first heat exchanger and the second heat exchanger is a water-cooled heat exchanger, and / or the heat exchanger type of the third heat exchanger is a multi-media heat exchanger.

[0020] In some embodiments, a computer-readable storage medium stores program instructions, which, when executed, are used to enable a computer to execute the control method for an air-conditioning system as described above.

[0021] The control method and device for an air conditioning system, the air conditioning system, and the computer-readable storage medium provided in the embodiments of the present disclosure can achieve the following technical effects:

[0022] In the disclosed embodiment, when the air-conditioning system is operating in heating mode, the frosting state of the third heat exchanger is obtained. When the frosting state of the third heat exchanger indicates that the third heat exchanger is frosted, the water temperature value of the heat storage device is obtained to determine whether the heat stored in the medium of the heat storage device is sufficient for defrosting. Subsequently, based on the correspondence between the water temperature value of the heat storage device and the heat storage condition, the heat storage pipeline is controlled to be turned on or off, and the bypass pipeline is controlled to be turned on or off to select the use of the heat storage device and the first heat exchanger to achieve the defrosting operation of the third heat exchanger. During the above-mentioned defrosting operation, there is no need to adjust the operating frequency of the compressor. Therefore, the outdoor heat exchanger is defrosted without sacrificing the operating frequency of the compressor, achieving frost-free operation of the air-conditioning system, reducing the impact of the compressor frequency increase on the energy consumption of the air-conditioning system, and saving energy.

[0023] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] One or more embodiments are exemplarily described by corresponding drawings. These exemplary descriptions and drawings do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements. The drawings do not constitute a scale limitation. In addition,

[0025] Figure 1 It is a schematic structural diagram of an air conditioning system provided by an embodiment of the present disclosure;

[0026] Figure 2 It is a schematic diagram of a control method for an air conditioning system provided by an embodiment of the present disclosure;

[0027] Figure 3 It is a schematic diagram of another control method for an air conditioning system provided by an embodiment of the present disclosure;

[0028] Figure 4 It is a schematic diagram of another control method for an air conditioning system provided by an embodiment of the present disclosure;

[0029] Figure 5 It is a schematic diagram of another control method for an air conditioning system provided by an embodiment of the present disclosure;

[0030] Figure 6 It is a schematic diagram of another control method for an air conditioning system provided by an embodiment of the present disclosure;

[0031] Figure 7 It is a schematic diagram of an application provided by an embodiment of the present disclosure;

[0032] Figure 8 It is a schematic diagram of a control device for an air conditioning system provided by an embodiment of the present disclosure.

[0033] Reference numerals:

[0034] 10: Refrigerant circulation pipeline; 20: Heat storage pipeline; 30: Bypass pipeline;

[0035] 101: Four-way valve; 102: Compressor; 103: First heat exchanger;

[0036] 104: Second heat exchanger; 105: Third heat exchanger;

[0037] 201: Heat storage device; 202: First solenoid valve;

[0038] 301: Second solenoid valve; 302: Water pump; 400: Air handling unit;

[0039] 200: Control device for an air conditioning system;

[0040] 700: Processor; 701: Memory; 702: Communication interface; 703: Bus. Detailed implementation manners

[0041] In order to understand the features and technical content of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for reference and illustration only and are not intended to limit the embodiments of the present disclosure. In the following technical description, for the sake of explanation, numerous details are provided to give a thorough understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be shown in a simplified manner to simplify the drawings.

[0042] In the description of the embodiments of the present disclosure, the terms "first", "second", etc. in the specification, claims and the above-mentioned drawings are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so as to implement the embodiments of the present disclosure described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion.

[0043] Unless otherwise specified, the term "plurality" means two or more.

[0044] In the embodiments of the present disclosure, the character " / " indicates that the objects before and after are in an "or" relationship. For example, A / B means: A or B.

[0045] The term "and / or" is a description of the associated relationship of an object and indicates that three relationships can exist. For example, A and / or B means: A or B, or, A and B these three relationships.

[0046] The term "corresponding" may refer to an associated relationship or a binding relationship. That A corresponds to B means that there is an associated relationship or a binding relationship between A and B.

[0047] As shown in combination Figure 1 The air-conditioning system includes a refrigerant circulation pipeline 10, a heat storage pipeline 20, and a bypass pipeline 30. The refrigerant circulation pipeline 10 includes a four-way valve 101, a compressor 102, a first heat exchanger 103, and a third heat exchanger 105 that are sequentially connected in series through pipelines. The first heat exchanger 103 is installed indoors, and the third heat exchanger 105 is installed outdoors. The bypass pipeline 30 is configured to connect the first heat exchanger 103 and the third heat exchanger 105 in parallel. The heat storage pipeline 20 is connected in parallel with the third heat exchanger 105, and the heat storage pipeline 20 includes a heat storage device 201, and a medium for storing heat is accommodated in the heat storage device 201.

[0048] When the air conditioning system provided by the embodiments of the present disclosure operates in the heating mode, the third heat exchanger serves as an evaporator and frosting will occur on its surface. In the embodiments of the present disclosure, the first heat exchanger and the third heat exchanger are connected in parallel through a bypass pipeline, and at the same time, they are connected in parallel with the third heat exchanger through a heat storage pipeline, so that the defrosting operation of the third heat exchanger can be performed by controlling the conduction of the bypass pipeline or the heat storage pipeline. During the above defrosting operation, it is not necessary to adjust the operating frequency of the compressor. Therefore, the defrosting operation of the outdoor heat exchanger can be performed without sacrificing the operating frequency of the compressor, realizing frost-free operation of the air conditioning system, reducing the impact of compressor frequency increase on the energy consumption of the air conditioning system, and saving energy.

[0049] Optionally, the heat exchanger types of the first heat exchanger and the second heat exchanger are water-cooled heat exchangers.

[0050] Optionally, the heat exchanger type of the third heat exchanger is a multi-medium heat exchanger. By selecting a multi-medium heat exchanger as the third heat exchanger, it is beneficial to conduct the heat of the refrigerant from the bypass pipeline or the heat storage pipeline, which helps to improve the defrosting effect of the outdoor heat exchanger and ensure the defrosting efficiency.

[0051] Optionally, the heat in the medium of the heat storage device 201 includes: the waste heat of the first heat exchanger 103 and / or the heat provided by a heat source other than the air conditioning system. As an example, the heat stored in the heat storage device 201 is the heat generated when the first heat exchanger 103 exchanges heat between the refrigerant and water. In a specific embodiment, the heat storage device 201 is located within the space range where the first heat exchanger 103 is located. The space range where the first heat exchanger 103 is located includes: within a circular area with the center of gravity of the first heat exchanger 103 as the center and a radius of 1.5L. Here, L represents the length of the first heat exchanger 103. The embodiments of the present disclosure do not specifically limit the source of the heat stored in the heat storage device 201.

[0052] It should be noted that the medium for storing heat in the heat storage device 201 can be water or other media capable of storing heat. Preferably, the medium for storing heat in the heat storage device 201 is water. When the medium for storing heat in the heat storage device 201 is water, the heat storage device 201 is a hot water storage tank. When the medium for storing heat in the heat storage device 201 is a solar heat storage medium, the heat storage device 201 is a solar heat storage unit.

[0053] Optionally, the heat storage pipeline 20 is provided with a first solenoid valve 202. The first solenoid valve 202 is configured to be controllably opened to conduct the heat storage pipeline 20 or controllably closed to cut off the heat storage pipeline 20.

[0054] Optionally, the bypass pipeline 30 is configured with a second solenoid valve 301. The second solenoid valve 301 is configured to be controllably opened to conduct the bypass pipeline 30 or controllably closed to cut off the bypass pipeline 30.

[0055] Optionally, the bypass pipeline 30 is further configured with a water pump 302. The water pump 302 is arranged on the pipeline close to the third heat exchanger 105. The water pump 302 is configured to adjust the water flow rate flowing through the third heat exchanger 105.

[0056] Optionally, the air-conditioning system further includes a second heat exchanger 104 and an air handling unit 400. The second heat exchanger 104 is installed between the first heat exchanger 103 and the third heat exchanger 105, and the first heat exchanger 103, the second heat exchanger 104, and the third heat exchanger 105 are connected in series in sequence. The air handling unit 400 is connected in parallel with the second heat exchanger 104. The air handling unit 400 is configured to increase the heat exchange capacity of the second heat exchanger 104. It should be noted that the number of air handling units 400 can be one or more. When the number of air handling units 400 is more than one, the multiple air handling units 400 are connected in parallel.

[0057] Based on the system structure of the above air conditioner system, as shown in Figure 2 the embodiments of the present disclosure provide a control method for an air-conditioning system, including:

[0058] S01, when the air-conditioning system operates in the heating mode, obtain the frosting state of the third heat exchanger.

[0059] S02, when the frosting state of the third heat exchanger indicates that the third heat exchanger is frosted, obtain the water temperature value of the heat storage device.

[0060] S03, according to the corresponding relationship between the water temperature value of the heat storage device and the heat storage condition, control the heat storage pipeline to be conducted or cut off, and control the bypass pipeline to be conducted or cut off to select to use the heat storage device and / or the first heat exchanger to perform a defrosting operation on the third heat exchanger.

[0061] By adopting the control method for an air-conditioning system provided in the embodiments of the present disclosure, when the air-conditioning system operates in a heating mode, the frosting state of the third heat exchanger is obtained. When the frosting state of the third heat exchanger indicates that the third heat exchanger is frosted, the water temperature value of the heat storage device is obtained to determine whether the heat stored in the medium in the heat storage device is sufficient for defrosting. Then, according to the correspondence between the water temperature value of the heat storage device and the heat storage condition, the heat storage pipeline is controlled to be conducted or cut off, and the bypass pipeline is controlled to be conducted or cut off to select the use of the heat storage device and the first heat exchanger, so as to realize the defrosting operation of the third heat exchanger. When selecting to use the heat storage device, the heat of the heat storage device can be transported to the third heat exchanger through the bypass pipeline, and when selecting to use the first heat exchanger, the heat of the first heat exchanger can be transported to the third heat exchanger through the bypass pipeline. It can be seen that during the above defrosting operation process, there is no need to adjust the operating frequency of the compressor accordingly. Therefore, the defrosting operation of the outdoor heat exchanger can be carried out without sacrificing the operating frequency of the compressor, realizing frost-free operation of the air-conditioning system, reducing the impact of compressor frequency increase on the energy consumption of the air-conditioning system, and saving energy.

[0062] In addition, when the embodiments of the present disclosure perform a defrosting operation on the outdoor heat exchanger, it will not affect the operation of the compressor, which is beneficial to ensuring the reliability and safety of the compressor operation. In addition, in the related art, defrosting is performed on the outdoor heat exchanger by increasing the frequency of the compressor. Therefore, higher requirements are put forward for the selection of the compressor, resulting in an increase in the cost of the air-conditioning system. However, the embodiments of the present disclosure do not need to perform the operation of increasing the compressor frequency, so there is no need to select a larger model of the compressor, which is beneficial to reducing the cost of the air-conditioning system.

[0063] Optionally, the air-conditioning system controls the heat storage pipeline to be conducted or cut off, and controls the bypass pipeline to be conducted or cut off according to the correspondence between the water temperature value of the heat storage device and the heat storage condition, so as to select the use of the heat storage device and / or the first heat exchanger to perform a defrosting operation on the third heat exchanger, including:

[0064] When the water temperature value of the heat storage device meets the heat storage start condition, the air-conditioning system controls the heat storage pipeline to be conducted to perform a defrosting operation on the third heat exchanger by using the heat storage device.

[0065] In this way, when the water temperature value of the heat storage device in the embodiments of the present disclosure meets the heat storage start condition, it indicates that the heat stored in the medium in the heat storage device is sufficient for defrosting. At this time, the heat storage device is controlled to be conducted to perform a defrosting operation on the third heat exchanger by using the heat storage device. In this way, the heat stored in the medium in the heat storage device can be fully utilized to realize the defrosting operation of the outdoor heat exchanger. During the above defrosting process, there is no need to switch the four-way valve, nor is it necessary to perform frequency increase adjustment on the compressor, which is beneficial to reducing the impact of compressor frequency increase on the energy consumption of the air-conditioning system and saving energy.

[0066] Optionally, in combination with Figure 3As shown, the air-conditioning system controls the on or off of the heat storage pipeline and the on or off of the bypass pipeline according to the correspondence between the water temperature value of the heat storage device and the heat storage condition, and selects to use the heat storage device and / or the first heat exchanger to perform a defrosting operation on the third heat exchanger, including:

[0067] S11. When the water temperature value of the heat storage device meets the heat storage start condition, the air-conditioning system controls the heat storage pipeline to be turned on to use the heat storage device to perform a defrosting operation on the third heat exchanger.

[0068] S12. After the air-conditioning system controls the heat storage pipeline to be turned on to use the heat storage device to perform a defrosting operation on the third heat exchanger, when the water temperature value of the heat storage device meets the heat storage switching condition, the air-conditioning system controls the bypass pipeline to be turned on to connect the first heat exchanger and the third heat exchanger, and controls the heat storage pipeline to remain turned on to simultaneously use the first heat exchanger and the heat storage device to perform a defrosting operation on the third heat exchanger.

[0069] In this way, when the water temperature value of the heat storage device in the embodiment of the present disclosure meets the heat storage start condition, it indicates that the heat stored in the medium in the heat storage device is sufficient for defrosting. At this time, the heat storage device is controlled to be turned on to use the heat storage device to perform a defrosting operation on the third heat exchanger. After controlling the heat storage device to be turned on to use the heat storage device to perform a defrosting operation on the third heat exchanger, when the water temperature value of the heat storage device meets the heat storage switching condition, it indicates that the heat stored in the medium in the heat storage device is not sufficient for defrosting, and other heat needs to be provided for defrosting. At this time, while controlling the heat storage pipeline to remain turned on, the bypass pipeline is controlled to be turned on to simultaneously use the first heat exchanger and the heat storage device to defrost the outdoor heat exchanger. In this way, while reducing the impact of compressor frequency increase on the energy consumption of the air-conditioning system, it is beneficial to realize the rationality and reliability of the heat supply required for defrosting, and can ensure the defrosting effect of the outdoor heat exchanger.

[0070] It should be noted that when the heat storage device and the first heat exchanger are used to perform a defrosting operation on the third heat exchanger in the embodiment of the present disclosure, the heat storage pipeline is preferentially controlled to be turned on to use the heat stored in the medium in the heat storage device for defrosting the outdoor heat exchanger. Secondly, the bypass pipeline is controlled to be turned on to connect the first heat exchanger and the third heat exchanger and use the heat of the first heat exchanger for defrosting the outdoor heat exchanger. In this way, the impact of the defrosting operation on the original heating operation of the air-conditioning system can be reduced, the system energy efficiency can be improved, and energy can be saved.

[0071] Optionally, as shown in Figure 4 the heat storage conditions include a heat storage start condition and a heat storage switching condition. The air-conditioning system determines that the water temperature value of the heat storage device meets the heat storage condition in the following manner:

[0072] S21. When the air-conditioning system operates in the heating mode, the air-conditioning system obtains the surface temperature of the third heat exchanger.

[0073] S22, the air conditioning system determines the sum of the surface temperature of the heat exchanger and the first temperature deviation value as the first temperature reference value.

[0074] S23, the air conditioning system determines the sum of the surface temperature of the heat exchanger and the second temperature deviation value as the second temperature reference value; wherein, the second temperature deviation value is less than the first temperature deviation value.

[0075] In this step, the first temperature deviation value is greater than or equal to 15°C and less than or equal to 20°C. The second temperature deviation value is greater than or equal to 5°C and less than or equal to 10°C. Preferably, the first temperature deviation value is equal to 15°C and the second temperature deviation value is equal to 5°C.

[0076] S24, when the water temperature value is greater than or equal to the first temperature reference value, the air conditioning system determines that the water temperature value of the heat storage device meets the heat storage start condition.

[0077] S25, when the water temperature value is less than or equal to the second temperature reference value, the air conditioning system determines that the water temperature value of the heat storage device meets the heat storage conversion condition.

[0078] In this way, in the embodiments of the present disclosure, the first temperature reference value and the second temperature reference value are respectively determined according to the sum of the surface temperature of the heat exchanger and the first temperature deviation value and the second temperature deviation value. Then, the water temperature value is compared with the first temperature reference value or the second temperature reference value. When the water temperature value is greater than or equal to the first temperature reference value, that is, the deviation between the water temperature value of the medium in the heat storage device and the surface temperature value of the heat exchanger of the third heat exchanger is large, it is determined that the water temperature value of the heat storage device meets the heat storage start condition, and it is determined that the heat stored in the medium in the heat storage device is sufficient for defrosting. When the water temperature value is less than or equal to the second temperature reference value, it is determined that the water temperature value of the heat storage device meets the heat storage conversion condition, and it is determined that the heat stored in the medium in the heat storage device is not sufficient for defrosting, and other heat needs to be provided for defrosting.

[0079] Optionally, as shown in Figure 5 The air conditioning system controls the conduction or cut-off of the heat storage pipeline and controls the conduction or cut-off of the bypass pipeline according to the correspondence between the water temperature value of the heat storage device and the heat storage condition to select the use of the heat storage device and / or the first heat exchanger to perform defrosting operation on the third heat exchanger, including:

[0080] S31, when the water temperature value of the heat storage device meets the heat storage start condition, the air conditioning system controls the heat storage pipeline to conduct to perform defrosting operation on the third heat exchanger by using the heat storage device.

[0081] S32. After the air conditioning system controls the heat storage pipeline to conduct so as to use the heat storage device to perform a defrosting operation on the third heat exchanger, when the water temperature value of the heat storage device meets the heat storage switching condition, control the bypass pipeline to conduct so that the first heat exchanger is connected to the third heat exchanger, and control the heat storage pipeline to continue to conduct so as to use the first heat exchanger and the heat storage device to perform the defrosting operation on the third heat exchanger simultaneously.

[0082] S33. After the air conditioning system controls the bypass pipeline to conduct so that the first heat exchanger is connected to the third heat exchanger, and controls the heat storage pipeline to continue to conduct so as to use the first heat exchanger and the heat storage device to perform the defrosting operation on the third heat exchanger, obtain a new water temperature value of the heat storage device again.

[0083] S34. When the new water temperature value meets the heat storage exit condition, the air conditioning system controls the heat storage pipeline to cut off to stop the heat storage device from performing the defrosting operation on the third heat exchanger.

[0084] S35. The air conditioning system controls the bypass pipeline to conduct continuously, so that the first heat exchanger and the third heat exchanger are continuously connected to continue to use the first heat exchanger to perform the defrosting operation on the third heat exchanger.

[0085] In this way, since the embodiment of the present disclosure uses the heat stored in the medium of the heat storage device for defrosting, it will cause the water temperature value to decrease and gradually approach the surface temperature of the heat exchanger. Therefore, the embodiment of the present disclosure needs to monitor the water temperature value in real time to determine whether the heat stored in the medium of the heat storage device can be continuously used for defrosting. Therefore, after controlling the bypass pipeline to conduct so that the first heat exchanger is connected to the third heat exchanger, and controlling the heat storage pipeline to continue to conduct so as to use the first heat exchanger and the heat storage device to perform the defrosting operation on the third heat exchanger simultaneously, obtain a new water temperature value of the heat storage device again. When the new water temperature value meets the heat storage exit condition, it indicates that the degree of proximity between the water temperature value and the surface temperature of the outdoor heat exchanger is relatively high, and the heat stored in the medium of the heat storage device cannot be used for defrosting continuously. At this time, control the heat storage pipeline to cut off to stop the heat storage device from performing the defrosting operation on the third heat exchanger, and control the bypass pipeline to conduct continuously, so that the first heat exchanger and the third heat exchanger are continuously connected to continue to use the first heat exchanger to perform the defrosting operation on the third heat exchanger. In summary, the embodiment of the present disclosure can judge the degree of proximity between the real-time water temperature value of the heat storage device and the surface temperature of the outdoor heat exchanger, and adaptively adjust the pipeline for defrosting, which helps to realize the reasonable distribution of defrosting heat and the rationality and reliability of the heat supply required for defrosting, thereby ensuring the defrosting effect of the outdoor heat exchanger.

[0086] Optionally, it further includes: after the air-conditioning system controls the heat storage pipeline to cut off to stop the heat storage device from performing defrosting operation on the third heat exchanger, controlling the heat storage device to perform heat storage operation. Wherein, performing the heat storage operation includes: storing the waste heat of the first heat exchanger; and / or storing the heat provided by a heat source other than the air-conditioning system. In this way, after the heat stored in the medium of the heat storage device can no longer be used for defrosting, the embodiments of the present disclosure can adjust the heat storage device to perform heat storage operation to store the waste heat of the first heat exchanger or the heat provided by a heat source other than the air-conditioning system into the medium, so as to reserve heat for the subsequent defrosting operation of the outdoor heat exchanger.

[0087] Optionally, the heat storage condition further includes a heat storage exit condition. The air-conditioning system determines that the water temperature value of the heat storage device meets the heat storage exit condition in the following manner:

[0088] When the air-conditioning system operates in the heating mode, the air-conditioning system obtains the surface temperature of the third heat exchanger.

[0089] The air-conditioning system determines the sum value of the heat exchanger temperature value and the third temperature deviation value as the third temperature reference value.

[0090] When the new water temperature value is less than or equal to the third temperature reference value, the air-conditioning system determines that the water temperature value of the heat storage device meets the heat storage exit condition. Wherein, the third temperature deviation value is less than the second temperature deviation value. The third temperature deviation value is greater than 0°C and less than or equal to 4°C. Preferably, the third temperature deviation value is equal to 2°C.

[0091] In this way, the embodiments of the present disclosure can indirectly know the proximity of the new water temperature value to the surface temperature of the outdoor heat exchanger according to the magnitudes of the new water temperature value and the third temperature reference value, realize the adaptive adjustment of the pipeline for defrosting, contribute to the reasonable distribution of defrosting heat, and realize the rationality and reliability of the heat supply required for defrosting, so as to ensure the defrosting effect of the outdoor heat exchanger.

[0092] Optionally, as shown in Figure 6 The air-conditioning system obtains the frosting state of the third heat exchanger, including:

[0093] S41, when the air-conditioning system operates in the heating mode, the air-conditioning system obtains the compressor suction pressure and the surface temperature of the third heat exchanger.

[0094] S42, the air-conditioning system determines the saturation temperature corresponding to the compressor suction pressure according to the compressor suction pressure.

[0095] S43, when the saturation temperature is less than the temperature threshold and the surface temperature of the heat exchanger is less than zero, the air-conditioning system determines that the third heat exchanger is in the frosting state. Wherein, the temperature threshold is greater than or equal to -2°C and less than 0°C. Preferably, the temperature threshold is equal to -1°C.

[0096] In this way, the embodiments of the present disclosure obtain the suction pressure of the compressor and the surface temperature of the heat exchanger of the outdoor heat exchanger in the heating mode. When the saturation temperature is less than the temperature threshold and the surface temperature of the heat exchanger is less than zero, it can be determined that the third heat exchanger is in a frosting state. This is beneficial to more accurately determine whether the air conditioner is frosting.

[0097] Optionally, it further includes: after the air conditioning system determines the saturation temperature corresponding to the suction pressure of the compressor according to the suction pressure of the compressor, when the saturation temperature is greater than or equal to the temperature threshold or the surface temperature of the heat exchanger is greater than or equal to zero, the air conditioning system determines that the third heat exchanger is in an unfrosted state.

[0098] In practical applications, as Figure 7 shown, the control method for the air conditioning system specifically performs the following steps:

[0099] Step S101, when the air conditioning system operates in the heating mode, the air conditioning system obtains the frosting state of the third heat exchanger.

[0100] Step S102, when the frosting state of the third heat exchanger indicates that the third heat exchanger is frosted, the air conditioning system obtains the water temperature value of the heat storage device.

[0101] Step S103, when the water temperature value of the heat storage device meets the heat storage start condition, the air conditioning system controls the first solenoid valve to open to conduct the heat storage pipeline.

[0102] Step S104, after the air conditioning system controls the first solenoid valve to open to conduct the heat storage pipeline, when the water temperature value of the heat storage device meets the heat storage switching condition, it controls the second solenoid valve to open to conduct the bypass pipeline to connect the first heat exchanger and the third heat exchanger, and controls the first solenoid valve to remain open to continuously conduct the heat storage pipeline.

[0103] Step S105, after the air conditioning system controls the second solenoid valve to open to conduct the bypass pipeline and controls the first solenoid valve to remain open to continuously conduct the heat storage pipeline, it obtains a new water temperature value of the heat storage device again.

[0104] Step S106, when the new water temperature value meets the heat storage exit condition, the air conditioning system controls the first solenoid valve to open to cut off the heat storage pipeline, and controls the second solenoid valve to remain open to continuously conduct the bypass pipeline.

[0105] Combined with Figure 8As shown in the figure, an embodiment of the present disclosure provides a control device 200 for an air-conditioning system, which includes a processor 700 and a memory 701. Optionally, the device 200 may further include a communication interface 702 and a bus 703. Among them, the processor 700, the communication interface 702, and the memory 701 can complete communication with each other through the bus 703. The communication interface 702 can be used for information transmission. The processor 700 can call the logical instructions in the memory 701 to execute the control method for the air-conditioning system in the above embodiment.

[0106] In addition, when the logical instructions in the above-mentioned memory 701 are implemented in the form of software functional units and sold or used as an independent product, they can be stored in a computer-readable storage medium.

[0107] The memory 701, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as the program instructions / modules corresponding to the method in the embodiment of the present disclosure. The processor 700 executes functional applications and data processing by running the program instructions / modules stored in the memory 701, that is, implements the control method for the air-conditioning system in the above embodiment.

[0108] The memory 701 may include a program storage area and a data storage area. Among them, the program storage area can store an operating system and application programs required for at least one function; the data storage area can store data created according to the use of the terminal device. In addition, the memory 701 may include a high-speed random access memory and may also include a non-volatile memory.

[0109] Combined with Figure 1 As shown in the figure, an embodiment of the present disclosure provides an air-conditioning system, which includes: an air-conditioning system body, and the above-mentioned control device 200 for the air-conditioning system. The air-conditioning system body includes a refrigerant circulation pipeline, a bypass pipeline, and a heat storage pipeline. The refrigerant circulation loop includes a compressor, a first heat exchanger, and a third heat exchanger connected in series through pipelines in sequence. The first heat exchanger is installed indoors, and the third heat exchanger is installed outdoors; the bypass pipeline is configured to connect the first heat exchanger and the third heat exchanger in parallel; the heat storage pipeline is connected in parallel with the third heat exchanger, and the heat storage pipeline includes a heat storage device. The control device 200 for the air-conditioning system is installed on the air-conditioning system body. The installation relationship described here is not limited to being placed inside the air-conditioning system body, but also includes installation connections with other components of the air-conditioning system, including but not limited to physical connections, electrical connections, or signal transmission connections, etc. Those skilled in the art can understand that the control device 200 for the air-conditioning system can be adapted to a feasible air-conditioning system main body, and then implement other feasible embodiments.

[0110] An embodiment of the present disclosure provides a computer-readable storage medium storing computer-executable instructions, and the computer-executable instructions are configured to execute the above control method for an air-conditioning system.

[0111] The technical solution of the embodiment of the present disclosure can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes one or more instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in the embodiment of the present disclosure. The foregoing storage medium may be a non-transitory storage medium, such as: a USB flash drive, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk, or an optical disc, and other media that can store program codes.

[0112] The above description and the drawings fully illustrate the embodiments of the present disclosure, enabling those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, process, and other changes. Embodiments only represent possible variations. Unless explicitly required, separate components and functions are optional, and the order of operations may vary. Parts and features of some embodiments may be included in or substituted for parts and features of other embodiments. Moreover, the terms used in this application are only for describing embodiments and are not used to limit the claims. As used in the description of the embodiments and the claims, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are intended to also include the plural forms. Similarly, as used in this application, the term "and / or" refers to any and all possible combinations including one or more of the associated listed items. Additionally, when used in this application, the term "comprise" and its variants "comprises" and / or "comprising" etc. mean the presence of the stated features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or groupings thereof. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, or device including the element. In this document, what each embodiment focuses on may be the differences from other embodiments, and the same or similar parts among the various embodiments may be referred to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method parts disclosed in the embodiments, the relevant parts may refer to the description of the method parts.

[0113] Those skilled in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner can depend on the specific application and design constraints of the technical solution. The skilled person can use different methods for each specific application to implement the described functions, but such implementation should not be considered to exceed the scope of the embodiments of the present disclosure. The skilled person can clearly understand that for the convenience and conciseness of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments, and will not be elaborated herein.

[0114] In the embodiments disclosed herein, the disclosed methods, products (including but not limited to devices, equipment, etc.) can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units can be merely a logical function division, and there can be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Additionally, the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces, and the indirect couplings or communication connections of the devices or units can be in electrical, mechanical, or other forms. The units described as separate components can be or can not be physically separated, and the components displayed as units can be or can not be physical units, that is, they can be located in one place or can be distributed to multiple network units. Some or all of the units can be selected according to actual needs to implement this embodiment. Additionally, in the embodiments of the present disclosure, the functional units can be integrated in one processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit.

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

Claims

1. A control method for an air conditioning system, characterized in that, The air conditioning system includes a refrigerant circulation pipeline, a bypass pipeline, and a heat storage pipeline. The refrigerant circulation pipeline includes a compressor, a first heat exchanger, and a third heat exchanger connected in series through pipelines. The first heat exchanger is installed indoors, and the third heat exchanger is installed outdoors. The bypass pipeline is configured to connect the first heat exchanger and the third heat exchanger in parallel. The heat storage pipeline is connected in parallel with the third heat exchanger. The heat storage pipeline includes a heat storage device. The heat storage device contains a medium for storing heat. The method includes: When the air conditioning system is operated in a heating mode, obtaining a frosting state of the third heat exchanger; When the frosting state of the third heat exchanger indicates that the third heat exchanger is frosted, obtaining a water temperature value of the heat storage device; According to the correspondence between the water temperature value of the heat storage device and the heat storage condition, the heat storage pipeline is controlled to be turned on or off, and the bypass pipeline is controlled to be turned on or off to select the heat storage device and / or the first heat exchanger to perform a defrosting operation on the third heat exchanger.

2. The method according to claim 1, wherein According to the correspondence between the water temperature value of the heat storage device and the heat storage condition, the heat storage pipeline is controlled to be turned on or off, and the bypass pipeline is controlled to be turned on or off to select the heat storage device and / or the first heat exchanger to perform a defrosting operation on the third heat exchanger, including: When the water temperature value of the heat storage device meets the heat storage start condition, the heat storage pipeline is controlled to be connected so as to perform a defrosting operation on the third heat exchanger using the heat storage device.

3. The method according to claim 2, wherein Also includes: After controlling the heat storage pipeline to be conducted so as to utilize the heat storage device to perform a defrost operation on the third heat exchanger, when the water temperature value of the heat storage device meets the heat storage switching condition, controlling the bypass pipeline to be conducted so as to connect the first heat exchanger with the third heat exchanger, and controlling the heat storage pipeline to be continuously conducted so as to simultaneously utilize the first heat exchanger and the heat storage device to perform a defrost operation on the third heat exchanger.

4. The method according to claim 3, characterized in that The heat storage conditions include heat storage start conditions and heat storage switching conditions. The water temperature value of the heat storage device is determined to meet the heat storage conditions in the following manner: When the air conditioning system is operated in a heating mode, obtaining a heat exchanger surface temperature of the third heat exchanger; Determine the sum of the heat exchanger surface temperature and the first temperature deviation value as the first temperature reference value; Determine the sum of the heat exchanger surface temperature and the second temperature deviation value as the second temperature reference value; wherein the second temperature deviation value is less than the first temperature deviation value; When the water temperature value is greater than or equal to the first temperature value reference value, determining that the water temperature value of the heat storage device meets the heat storage start condition; When the water temperature value is less than or equal to the second temperature value reference value, it is determined that the water temperature value of the heat storage device meets the heat storage conversion condition.

5. The method according to claim 3, wherein Also includes: Controlling the bypass line to be open so that the first heat exchanger is connected to the third heat exchanger, and controlling the heat storage line to be continuously open so that the first heat exchanger and the heat storage device are simultaneously used to perform a defrosting operation on the third heat exchanger, and then obtaining a new water temperature value of the heat storage device; When the new water temperature value meets the heat storage exit condition, the heat storage pipeline is controlled to be cut off to stop the heat storage device from performing the defrosting operation on the third heat exchanger; The bypass line is controlled to be continuously connected, so that the first heat exchanger and the third heat exchanger are continuously connected to each other so that the first heat exchanger can continue to perform a defrosting operation on the third heat exchanger.

6. The method according to claim 5, characterized in that, Also includes: After controlling the heat storage pipeline to cut off to stop the defrosting operation of the third heat exchanger by the heat storage device, control the heat storage device to perform heat storage operation; wherein, performing the heat storage operation includes: storing the waste heat of the first heat exchanger; and / or, storing the heat provided by a heat source other than the air conditioning system.

7. A control device for an air conditioning system, comprising a processor and a memory storing program instructions, characterized in that, The processor is configured to execute the control method for the air conditioning system according to any one of claims 1 to 6 when running the program instructions.

8. An air conditioning system, characterized in that, Comprising: A refrigerant circulation pipeline, including a compressor, a first heat exchanger and a third heat exchanger connected in series through pipelines in sequence, the first heat exchanger is installed indoors, and the third heat exchanger is installed outdoors; A bypass pipeline, configured to connect the first heat exchanger and the third heat exchanger in parallel; A heat storage pipeline, connected in parallel with the third heat exchanger, the heat storage pipeline includes a heat storage device, and a medium for storing heat is accommodated in the heat storage device.

9. The air conditioning system according to claim 8, characterized in that The heat exchanger types of the first heat exchanger and the second heat exchanger are water-cooled heat exchangers, and / or, the heat exchanger type of the third heat exchanger is a multi-medium heat exchanger.

10. A computer-readable storage medium storing program instructions, characterized in that, When the program instructions are running, they are used to cause the computer to execute the control method for the air conditioning system according to any one of claims 1 to 6.

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