Control method for heat exchange system, and control apparatus, heating, ventilation and air conditioning device, and storage medium

Abstract

The present application relates to the technical field of heating, ventilation and air conditioning devices, and in particular to a control method for a heat exchange system, and a control apparatus, a heating, ventilation and air conditioning device, and a storage medium. The control method for a heat exchange system comprises: acquiring an operating duration of a heat exchange system in a simultaneous refrigeration and heating mode; acquiring operating parameters of the heat exchange system on the basis of the operating duration being greater than or equal to a first preset duration; on the basis of the operating parameters satisfying a first preset condition, controlling the heat exchange system to switch from the simultaneous refrigeration and heating mode to another mode; and on the basis of the operating duration of the heat exchange system in another mode being greater than a second preset duration, controlling the heat exchange system to switch from another mode to the simultaneous refrigeration and heating mode, wherein when the heat exchange system is in another mode, an air-cooled heat exchanger is provided in refrigerant circulation piping. By means of the control method for a heat exchange system in the present application, a refrigerant in the air-cooled heat exchanger can be pumped out, increasing the amount of the refrigerant participating in circulation in the heat exchange system, improving the energy efficiency of the heat exchange system.

Description

Control methods, control devices, HVAC equipment, and storage media for heat exchange systems

[0001] Cross-reference of related applications

[0002] This application claims priority to Chinese Patent Application No. 202410668813.1, filed on May 28, 2024, with the China National Intellectual Property Administration, entitled “Control Method, Control Device, HVAC Equipment and Storage Medium for Heat Exchange System”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of heating, ventilation and air conditioning (HVAC) equipment technology, and in particular to a heat exchange system, a control method for the heat exchange system, a control device, HVAC equipment, and a storage medium. Background Technology

[0004] This section provides only background information relevant to this disclosure and is not necessarily prior art.

[0005] A heat exchange system is a main unit system that can achieve independent cooling, independent heating, or simultaneous heating and cooling functions.

[0006] The refrigerant requirements vary depending on the operating mode of the heat exchange system. Generally, the refrigerant requirement is greatest when the heat exchange system is in standalone cooling mode, moderate when it is in standalone heating mode, and least when it is in simultaneous cooling and heating mode. Therefore, the heat exchange system uses a liquid storage component as a refrigerant regulating container.

[0007] When a heat exchange system is idle for an extended period in a low-temperature environment, due to the migration characteristics of the refrigerant, the refrigerant in the system will typically migrate to the air-cooled heat exchanger, which has the lowest temperature. When the heat exchange system is started up and enters simultaneous cooling and heating mode, the refrigerant is not easily extracted from the air-cooled heat exchanger, resulting in a decrease in the energy efficiency of the heat exchange system. Summary of the Invention

[0008] The purpose of this application is to at least solve the problem of reduced energy efficiency in heat exchange systems when the refrigerant is not easily extracted from the air-cooled heat exchanger after prolonged standby in low-temperature environments and the system is started up to enter simultaneous cooling and heating mode. This purpose is achieved through the following technical solution:

[0009] The first aspect of this application discloses a control method for a heat exchange system, the heat exchange system including an air-cooled heat exchanger and a refrigerant circulation pipeline, the control method comprising:

[0010] Obtain the operating time of the heat exchange system in simultaneous cooling and heating mode;

[0011] The operating parameters of the heat exchange system are obtained based on the running time being greater than or equal to the first preset time.

[0012] Based on the fact that the operating parameters meet the first preset condition, the heat exchange system is controlled to switch from the simultaneous cooling and heating mode to another mode.

[0013] If the operating time of the heat exchange system in the other mode is greater than a second preset time, the heat exchange system is controlled to switch from the other mode to the simultaneous cooling and heating mode.

[0014] When the heat exchange system is in simultaneous cooling and heating mode, the air-cooled heat exchanger is disconnected from the refrigerant circulation pipeline and does not participate in the refrigerant circulation. When the heat exchange system is in the other mode, the air-cooled heat exchanger is connected to the refrigerant circulation pipeline and participates in the refrigerant circulation.

[0015] The control method for the heat exchange system in this application, after the heat exchange system operates in cooling and heating mode for a duration greater than or equal to a first preset duration, when the operating parameters meet the first preset condition, controls the heat exchange system to switch from simultaneous cooling and heating mode to another mode, and controls the heat exchange system to operate in the other mode for a duration greater than a second preset duration. In the other mode, the air-cooled heat exchanger is located in the refrigerant circulation pipeline, so the refrigerant in the air-cooled heat exchanger can be extracted, increasing the amount of refrigerant participating in the circulation in the heat exchange system and improving the energy efficiency of the heat exchange system.

[0016] In some embodiments of this application, obtaining the operating parameters of the heat exchange system includes obtaining the low-pressure of the heat exchange system and obtaining the intake superheat of the heat exchange system.

[0017] In some embodiments of this application, controlling the heat exchange system to switch from the simultaneous cooling and heating mode to another mode based on the operating parameters meeting a first preset condition includes:

[0018] The low pressure of the heat exchange system is less than a first preset pressure value and the duration is greater than a first preset value, and / or the suction superheat is greater than a first preset suction value and the duration is greater than a second preset value.

[0019] The heat exchange system is controlled to switch from the simultaneous cooling and heating mode to the other mode. In some embodiments of this application, the heat exchange system further includes a liquid storage component and a refrigerant regulating pipeline, wherein the refrigerant regulating pipeline is connected in parallel with the refrigerant circulation pipeline, and the liquid storage component is provided on the refrigerant regulating pipeline;

[0020] Controlling the heat exchange system to switch from the simultaneous cooling and heating mode to the other mode includes controlling the heat exchange system to switch from the simultaneous cooling and heating mode to a separate cooling mode;

[0021] When the heat exchange system is in the separate cooling mode, the liquid storage component is connected to the refrigerant circulation pipeline and is used to supply refrigerant to the refrigerant circulation pipeline.

[0022] In some embodiments of this application, the heat exchange system further includes a liquid storage component and a refrigerant regulating pipeline, wherein the refrigerant regulating pipeline is connected to the refrigerant circulation pipeline in parallel, and the liquid storage component is provided on the refrigerant regulating pipeline;

[0023] Controlling the heat exchange system to switch from the simultaneous cooling and heating mode to the other mode includes controlling the heat exchange system to switch from the simultaneous cooling and heating mode to a separate heating mode, wherein the liquid storage component and the refrigerant circulation pipeline are disconnected.

[0024] In some embodiments of this application, a first valve and a second valve are provided on the refrigerant regulating pipeline, with the first valve and the second valve respectively located at both ends of the liquid storage assembly.

[0025] In some embodiments of this application, the first preset duration is in the range of 3 to 10 minutes, and / or the second preset duration is in the range of 3 to 10 minutes.

[0026] A second aspect of this application provides a control device, the control device comprising:

[0027] The first acquisition module is used to acquire the running time of the heat exchange system in simultaneous cooling and heating mode;

[0028] The second acquisition module is used to acquire the operating parameters of the heat exchange system based on the running time being greater than or equal to the first preset time.

[0029] The control module is configured to control the heat exchange system to switch from the simultaneous cooling and heating mode to another mode according to the first preset condition of the operating parameters, and to control the heat exchange system to switch from the other mode to the simultaneous cooling and heating mode according to the running time of the heat exchange system in the other mode being greater than the second preset time.

[0030] A third aspect of this application provides a heating, ventilation, and air conditioning (HVAC) device, the HVAC device including a memory, a processor, and an air conditioning system control program stored in the memory and running on the processor, the air conditioning system control program being configured to implement the control method of the heat exchange system mentioned in the above embodiments.

[0031] The fourth aspect of this application proposes a storage medium storing an air conditioning system control program, which, when executed by a processor, implements the control method for the heat exchange system mentioned in the above embodiments. Attached Figure Description

[0032] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0033] Figure 1 schematically shows the structure of the heat exchange system in standalone refrigeration mode;

[0034] Figure 2 schematically shows the structure of the heat exchange system in standalone heating mode;

[0035] Figure 3 schematically shows the structure of the heat exchange system in simultaneous cooling and heating mode;

[0036] Figure 4 schematically illustrates a flowchart of a control method for a heat exchange system according to an embodiment of this application;

[0037] Figure 5 schematically shows a detailed flowchart of the control method for the heat exchange system according to an embodiment of this application;

[0038] Figure 6 schematically shows another specific flowchart of the control method of the heat exchange system according to an embodiment of the present application;

[0039] Figure 7 is a schematic diagram of the control device of the heat exchange system.

[0040] The attached diagram is labeled as follows: 100, Heat exchange system; 10, Refrigerant circulation pipeline; 11, Compressor; 12, Four-way valve; 121, First port; 122, Second port; 123, Third port; 124, Fourth port; 13, Air-cooled heat exchanger; 14, First electronic expansion valve; 15, Cold water heat exchanger; 151, First inlet; 152, First outlet; 16, First control valve; 17, Second electronic expansion valve; 18, Second control valve; 19, Hot water heat exchanger; 191, Second inlet; 192, Second outlet; 101, First refrigerant pipe; 102, Second refrigerant pipe; 103, Third refrigerant pipe; 1031, First sub-pipe; 1032, Second sub-pipe; 104, Fourth refrigerant pipe; 105, Fifth refrigerant pipe; 1051, Third sub-pipe; 1052, Fourth sub-pipe; 106, Sixth refrigerant pipe; 20. Refrigerant regulating pipeline; 21. Liquid storage assembly; 22. First pipeline; 23. Second pipeline; 24. First valve; 25. Second valve; 30. First acquisition module; 40. Second acquisition module; 50. Control module. Detailed Implementation

[0041] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0042] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0043] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0044] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations.

[0045] As shown in Figures 1 to 3, Figure 1 schematically illustrates the structure of the heat exchange system 100 in standalone cooling mode, Figure 2 schematically illustrates the structure of the heat exchange system 100 in standalone heating mode, and Figure 3 schematically illustrates the structure of the heat exchange system 100 in simultaneous cooling and heating mode. The heat exchange system 100 includes a refrigerant circulation pipeline 10 and a refrigerant regulating pipeline 20. The refrigerant circulation pipeline 10 and the refrigerant regulating pipeline 20 are connected in parallel, and a liquid storage component 21 is provided on the refrigerant regulating pipeline 20. The liquid storage component 21 can selectively connect with the refrigerant circulation pipeline 10 to regulate the amount of refrigerant in the refrigerant circulation pipeline 10.

[0046] It should be noted that the heat exchange system 100 is an air conditioning unit system capable of independent cooling, independent heating, and simultaneous heating and cooling functions. It has three operating modes: independent heating mode, independent cooling mode, and simultaneous heating and cooling mode. The refrigerant requirement varies depending on the operating mode. Specifically, in independent cooling mode, the heat exchange system 100 requires the most refrigerant, requiring all refrigerant to circulate in the refrigerant circulation pipe 10. In independent heating mode, the refrigerant requirement in the refrigerant circulation pipe 10 is moderate, requiring dynamic adjustment of the refrigerant quantity. In simultaneous heating and cooling mode, the heat exchange system 100 requires the least refrigerant, requiring a reduction in the refrigerant quantity in the refrigerant circulation pipe 10 to achieve precise refrigerant quantity control.

[0047] According to the heat exchange system 100 of this application, a refrigerant regulating pipeline 20 is set in parallel with the refrigerant circulation pipeline 10. The refrigerant regulating pipeline 20 is equipped with a liquid storage component 21, which is selectively connected to the refrigerant circulation pipeline 10 to regulate the amount of refrigerant in the refrigerant circulation pipeline 10. The liquid storage component 21 can absorb the refrigerant in the refrigerant circulation pipeline 10 or release the refrigerant stored in the liquid storage component 21 into the refrigerant circulation pipeline 10, thereby achieving fine regulation of the amount of refrigerant in the refrigerant circulation pipeline 10.

[0048] It is important to emphasize that the liquid storage component 21 mentioned here can be a liquid storage tank or other container used to store refrigerant, enabling the storage of refrigerant. Furthermore, the liquid storage component 21 is selectively connected to the refrigerant circulation pipeline 10 to regulate the amount of refrigerant in the pipeline 10. This means that the liquid storage component 21 and the refrigerant circulation pipeline 10 can be in a disconnected or connected state, depending on the operating mode of the heat exchange system 100, thereby achieving the regulation of the amount of refrigerant in the refrigerant circulation pipeline 10.

[0049] Optionally, as shown in Figure 1, the refrigerant regulating pipeline 20 includes a first pipeline 22, which can be a circular or rectangular pipe, and the first pipeline 22 has two ends, which are respectively connected to one end of the refrigerant circulation pipeline 10 and the liquid storage component 21. A first valve 24 is provided on the first pipeline 22.

[0050] The first valve 24 here is used to control the connection or disconnection of the first pipeline 22. When the first valve 24 is in the open state, the first pipeline 22 is in the connected state, which enables one end of the liquid storage component 21 to be connected to the refrigerant circulation pipeline 10.

[0051] The first valve 24 here can be a solenoid valve or other valves that can achieve automatic control.

[0052] Optionally, the refrigerant circulation pipeline 10 of the heat exchange system 100 is equipped with a compressor 11, a four-way valve 12, and a heat exchange assembly that are interconnected. These components can be connected in sequence through pipelines, wherein the first pipeline 22 is connected to the heat exchange assembly.

[0053] The number of heat exchange components here can be one, two, or more, and the appropriate heat exchange components can be selected to work as needed.

[0054] Specifically, the heat exchange components include an air-cooled heat exchanger 13, a cold water heat exchanger 15, and a hot water heat exchanger 19. The first pipeline 22 is connected to the cold water heat exchanger 15. The heat exchange system 100 selects different heat exchange components to enter the circulation process according to different working modes.

[0055] Referring again to Figure 1, the heat exchange system 100 includes multiple pipelines. The compressor 11 and the four-way valve 12 are connected via a first refrigerant pipe 101. The four-way valve 12 is connected to an air-cooled heat exchanger 13 via a second refrigerant pipe 102. The air-cooled heat exchanger 13 is connected to a chilled water heat exchanger 15 via a first sub-pipe 1031 of a third refrigerant pipe 103. The air-cooled heat exchanger 13 is connected to a hot water heat exchanger 19 via a second sub-pipe 1032 of the third refrigerant pipe 103. A first control valve 16 and a first electronic expansion valve 14 are provided on the first sub-pipe 1031, and a second electronic expansion valve 17 is provided on the second sub-pipe 1032. The first sub-pipe 1031 and the second sub-pipe 1032 are connected via a fourth refrigerant pipe 104, on which a second control valve 18 is provided.

[0056] Optionally, the hot water heat exchanger 19 is connected to the four-way valve 12 via the sixth refrigerant pipe 106, the cold water heat exchanger 15 is connected to the compressor 11 via the fourth sub-pipe 1052 of the fifth refrigerant pipe 105, and the cold water heat exchanger 15 is connected to the four-way valve 12 via the third sub-pipe 1051 of the fifth refrigerant pipe 105. By switching on and off different pipes, the heat exchange system 100 can be controlled, thereby realizing different working modes of the heat exchange system 100.

[0057] The following section will elaborate on the different operating modes of the heat exchange system 100.

[0058] Optionally, as shown in Figure 1, when the refrigerant circulation pipeline 10 is in the standby cooling mode, a four-way valve 12, an air-cooled heat exchanger 13, a first electronic expansion valve 14, and a chilled water heat exchanger 15 are sequentially arranged along the exhaust direction of the compressor 11. These components can form a cooling flow path; the first pipeline 22 can be connected to the suction side of the compressor 11, wherein the first valve 24 is in the open state.

[0059] It should be noted that the air-cooled heat exchanger 13 here can be a finned heat exchanger, which has a better heat exchange effect. The four-way valve 12 here has four ports, namely the first port 121, the second port 122, the third port 123, and the fourth port 124. The outlet of the compressor 11 is connected to the first port 121 of the four-way valve 12, the second port 122 of the four-way valve 12 is connected to the inlet of the chilled water heat exchanger 15, the outlet of the chilled water heat exchanger 15 is connected to the inlet of the first electronic expansion valve 14, the outlet of the first electronic expansion valve 14 is connected to the inlet of the chilled water heat exchanger 15, and the outlet of the chilled water heat exchanger 15 is connected to the air inlet of the compressor 11, thereby realizing the circulation of refrigerant.

[0060] Specifically, the outlet of the compressor 11 is connected to the first port 121 of the four-way valve 12 via a first refrigerant pipe 101; the second port 122 of the four-way valve 12 is connected to the inlet of the chilled water heat exchanger 15 via a second refrigerant pipe 102; the outlet of the chilled water heat exchanger 15 is connected to the inlet of the first electronic expansion valve 14 via a third refrigerant pipe 103 and a first sub-pipe 1031; the outlet of the first electronic expansion valve 14 is connected to the inlet of the chilled water heat exchanger 15 via a first sub-pipe 1031; and the outlet of the chilled water heat exchanger 15 is connected to the inlet of the compressor 11 via a fifth refrigerant pipe 105 and a fourth sub-pipe 1052.

[0061] In Figure 1, the refrigerant flows in the direction indicated by the arrow.

[0062] Optionally, the cold water heat exchanger 15 is provided with a first inlet 151 and a first outlet 152, wherein the first inlet 151 is connected to a water source and the first outlet 152 is connected to the user's output end to provide cold water to the user.

[0063] Optionally, a first control valve 16 is provided in the refrigeration flow path. The two ends of the first control valve 16 are connected to the air-cooled heat exchanger 13 and the first electronic expansion valve 14, respectively. That is, when the refrigerant is circulating, after flowing out of the air-cooled heat exchanger 13, it passes through the first control valve 16 and the first electronic expansion valve 14 in sequence. The first control valve 16 can adopt a one-way valve structure to realize the one-way flow of the refrigerant.

[0064] As shown in Figure 1, when the refrigerant circulation pipeline 10 is in standby cooling mode, the outlet of the compressor 11 is connected to the first port 121 of the four-way valve 12, the second port 122 of the four-way valve 12 is connected to the inlet of the air-cooled heat exchanger 13, the outlet of the air-cooled heat exchanger 13 is connected to the inlet of the first control valve 16, the outlet of the first control valve 16 is connected to the inlet of the first electronic expansion valve 14, the outlet of the first electronic expansion valve 14 is connected to the inlet of the chilled water heat exchanger 15, and the outlet of the chilled water heat exchanger 15 is connected to the inlet of the compressor 11, thus achieving refrigerant circulation. In this mode, after the refrigerant flows out of the compressor 11, it passes through the four-way valve 12, the air-cooled heat exchanger 13, the first control valve 16, the first electronic expansion valve 14, and the chilled water heat exchanger 15 in sequence before returning to the compressor 11, achieving refrigerant circulation. The flow path is represented by a dashed line.

[0065] When the refrigerant circulation pipeline 10 is in standby cooling mode, the first valve 24 of the refrigerant regulating pipeline 20 is open and the first pipeline 22 is connected, enabling one end of the liquid storage component 21 to be connected to the refrigerant circulation pipeline 10. All the refrigerant in the liquid storage component 21 can be delivered to the compressor 11 after passing through the first pipeline 22, the hot water heat exchanger 19, the fourth port 124 of the four-way valve 12, and the third port 123 of the four-way valve 12 in sequence, so that all the refrigerant participates in the circulation process of the refrigerant circulation pipeline 10. In standby cooling mode, there is no refrigerant inside the liquid storage component 21, and all the refrigerant participates in the refrigerant circulation pipeline 10.

[0066] Optionally, the refrigerant regulating pipeline 20 also includes a second pipeline 23. The two ends of the second pipeline 23 are respectively connected to the other end of the liquid storage component 21 and the refrigerant circulation pipeline 10. A second valve 25 is provided on the second pipeline 23. At this time, the second valve 25 is in the closed state and can disconnect the second pipeline 23.

[0067] Optionally, as shown in Figure 2, when the refrigerant circulation pipeline 10 is in standby heating mode, the refrigerant circulation pipeline 10 includes a compressor 11, and a four-way valve 12, a hot water heat exchanger 19, a second electronic expansion valve 17, and an air-cooled heat exchanger 13 are sequentially arranged along the exhaust direction of the compressor 11. The compressor 11, the four-way valve 12, the hot water heat exchanger 19, the second electronic expansion valve 17, and the air-cooled heat exchanger 13 form a heating flow path; the first pipeline 22 is connected to the inlet end of the second electronic expansion valve 17, and a first valve 24 is provided on the first pipeline 22. The first pipeline 22 is selectively connected to adjust the amount of refrigerant in the refrigerant circulation pipeline 10.

[0068] Optionally, the hot water heat exchanger 19 is provided with a second inlet 191 and a second outlet 192, wherein the second inlet 191 is connected to a water source and the second outlet 192 is connected to the user's output end to provide hot water to the user.

[0069] It should be noted that the first pipeline 22 is selectively connected to adjust the amount of refrigerant in the refrigerant circulation pipeline 10. Specifically, the first valve 24 can determine whether to open instantaneously based on the high pressure condition of the heat exchange system 100, and dynamically adjust the amount of refrigerant required for the refrigerant circulation pipeline. For example, for R410a refrigerant, when the high pressure in the heat exchange system 100 is greater than the first preset value, the first valve 24 is opened for a certain period of time and then closed.

[0070] Specifically, when the high pressure in the heat exchange system 100 is greater than 39MPa, the first valve 24 is opened for 3 or 5 seconds, thereby adjusting the amount of refrigerant circulating in the heat exchange system 100, reducing the high pressure in the heat exchange system 100, and thus improving the unit energy efficiency of the heat exchange system 100.

[0071] Of course, the first preset value and the opening time of the first valve 24 are different for different types of refrigerants, and can be adjusted as needed, which will not be elaborated here.

[0072] As shown in Figure 2, when the refrigerant circulation pipeline 10 is in standby heating mode, the outlet of the compressor 11 is connected to the first port 121 of the four-way valve 12, the fourth port 124 of the four-way valve 12 is connected to the inlet of the hot water heat exchanger 19, the outlet of the hot water heat exchanger 19 is connected to the inlet of the second electronic expansion valve 17, the outlet of the second electronic expansion valve 17 is connected to the inlet of the air-cooled heat exchanger 13, the outlet of the air-cooled heat exchanger 13 is connected to the second port 122 of the four-way valve 12, and the third port 123 of the four-way valve 12 is connected to the inlet of the compressor 11, thereby enabling the refrigerant to circulate.

[0073] In standalone heating mode, after the refrigerant flows out of the compressor 11, it passes through the first refrigerant pipe 101, the four-way valve 12, the sixth refrigerant pipe 106, the hot water heat exchanger 19, the second electronic expansion valve 17, the air-cooled heat exchanger 13, and the four-way valve 12 before returning to the compressor 11, thus realizing the circulation of the refrigerant.

[0074] When the refrigerant circulation pipeline 10 is in standby heating mode, the first valve 24 of the refrigerant regulating pipeline 20 is in a selectively connected state. When the first pipeline 22 is in a connected state, one end of the liquid storage component 21 can be connected to the refrigerant circulation pipeline 10, and excess refrigerant can be transported into the liquid storage component 21 to dynamically adjust the amount of refrigerant in the refrigerant circulation pipeline 10 and realize the storage of excess refrigerant.

[0075] Optionally, as shown in Figure 3, when the refrigerant circulation pipeline 10 is in simultaneous cooling and heating mode, the refrigerant circulation pipeline 10 includes a compressor 11, and a four-way valve 12, a hot water heat exchanger 19, a first electronic expansion valve 14, and a cold water heat exchanger 15 are connected sequentially along the discharge direction of the compressor 11. The compressor 11, the four-way valve 12, the hot water heat exchanger 19, the first electronic expansion valve 14, and the cold water heat exchanger 15 form a simultaneous cooling and heating flow path; the first pipeline 22 is connected to the outlet end of the cold water heat exchanger 15, and the first valve 24 is in the open state.

[0076] Optionally, a second control valve 18 is also provided in the cooling and heating flow path, with its two ends connected to the first electronic expansion valve 14 and the hot water heat exchanger 19, respectively. The second control valve 18 can be a one-way valve structure to achieve unidirectional flow of the refrigerant.

[0077] As shown in Figure 3, when the refrigerant circulation pipeline 10 is in simultaneous cooling and heating mode, the outlet of the compressor 11 is connected to the first port 121 of the four-way valve 12, the fourth port 124 of the four-way valve 12 is connected to the inlet of the hot water heat exchanger 19, the outlet of the hot water heat exchanger 19 is connected to the inlet of the second control valve 18, the outlet of the second control valve 18 is connected to the inlet of the first electronic expansion valve 14, the outlet of the first electronic expansion valve 14 is connected to the inlet of the cold water heat exchanger 15, and the outlet of the cold water heat exchanger 15 is connected to the inlet of the compressor 11, thereby realizing the circulation of refrigerant.

[0078] In the simultaneous cooling and heating mode, after the refrigerant flows out of the compressor 11, it passes through the four-way valve 12, the hot water heat exchanger 19, the second control valve 18, the first electronic expansion valve 14, and the cold water heat exchanger 15 in sequence before returning to the compressor 11, thus realizing the circulation of the refrigerant.

[0079] It should be noted that in the simultaneous cooling and heating mode, the first pipe 22 is connected to the outlet end of the cold water heat exchanger 15, and the first valve 24 is in the open state, which can store excess refrigerant inside the liquid storage component 21 until the liquid storage component 21 is completely filled.

[0080] Optionally, the refrigerant regulating pipeline 20 also includes a second pipeline 23, one end of which is connected to the other end of the liquid storage component 21, and the other end of which is connected to the refrigerant circulation pipeline 10. A second valve 25 is provided on the second pipeline 23, wherein the second valve 25 is in a closed state to disconnect the second pipeline 23.

[0081] Optionally, either the first valve 24 or the second valve 25 can be a solenoid valve, or both the first valve 24 and the second valve 25 can be solenoid valves, which can realize automatic control of the pipeline. In addition to using solenoid valves, the first valve 24 and the second valve 25 can also be manually controlled valves or other structures.

[0082] It should be noted that the first valve 24 and the second valve 25 are respectively located at both ends of the liquid storage component 21 to adjust the amount of refrigerant participating in the circulation in the heat exchange system 100.

[0083] It is important to emphasize that the arrows in Figures 1 to 3 indicate the direction of refrigerant flow. The dashed lines in Figures 1 to 3 connect components that are not involved in the refrigerant circulation path.

[0084] The control method of the heat exchange system 100 will be described in detail below with reference to Figures 4 to 7.

[0085] This application proposes a control method for a heat exchange system 100, which includes an air-cooled heat exchanger 13 and a refrigerant circulation pipeline 10, as shown in Figure 4. The control method includes:

[0086] S41. Obtain the operating time of the heat exchange system 100 in simultaneous cooling and heating mode;

[0087] S42. Obtain the operating parameters of the heat exchange system 100 based on the operating time being greater than or equal to the first preset time.

[0088] S43. Based on the fact that the operating parameters meet the first preset condition, control the heat exchange system 100 to switch from the simultaneous cooling and heating mode to another mode.

[0089] S44. If the running time of the heat exchange system 100 in another mode is greater than the second preset time, control the heat exchange system 100 to switch from the other mode to the simultaneous cooling and heating mode; wherein, when the heat exchange system 100 is in another mode, the air-cooled heat exchanger 13 is installed in the refrigerant circulation pipeline 10.

[0090] It should be noted that if the heat exchange system 100 is started in simultaneous cooling and heating mode after being idled in a low-temperature environment for a long time, there will be insufficient refrigerant. Therefore, this application focuses on the case of starting in simultaneous cooling and heating mode.

[0091] Before S41, the heat exchange system 100 is in a standby state in a low-temperature environment. The heat exchange system 100 is started in a simultaneous cooling and heating mode.

[0092] In S42, the first preset duration can be a specific value or a range value. For example, the first preset duration can be 3 to 10 minutes, such as five minutes or six minutes. When the running time of the heat exchange system 100 is greater than or equal to the first preset duration, the operating parameters of the heat exchange system 100 are obtained, so that the operating status of the heat exchange system 100 can be detected.

[0093] When the heat exchange system 100 is in simultaneous cooling and heating mode, the air-cooled heat exchanger 13 is disconnected from the refrigerant circulation pipeline 10 and does not participate in the refrigerant circulation. When the heat exchange system 100 is in another mode, the air-cooled heat exchanger 13 is connected to the refrigerant circulation pipeline 10 and participates in the refrigerant circulation. This other mode includes a standalone cooling mode and a standalone heating mode. In both of these modes, the air-cooled heat exchanger 13 is connected to the refrigerant circulation pipeline 10 and participates in the refrigerant circulation.

[0094] In S43, the first preset condition can be set with different conditions according to the type of operating parameter, so that it can be controlled separately, which will be described in detail later.

[0095] In S44, the heat exchange system 100 can adjust the amount of refrigerant by switching modes, so that the refrigerant in the air-cooled heat exchanger 13 can participate in the circulation process of the heat exchange system 100.

[0096] The control method of the heat exchange system 100 in this application, after the heat exchange system 100 operates in the cooling and heating mode for a duration greater than or equal to a first preset duration, when the operating parameters meet the first preset condition, controls the heat exchange system 100 to switch from the simultaneous cooling and heating mode to another mode, and controls the heat exchange system 100 to operate in the other mode for a duration greater than a second preset duration. When the heat exchange system 100 is in the other mode, the air-cooled heat exchanger 13 is installed in the refrigerant circulation pipeline 10, so the refrigerant in the air-cooled heat exchanger 13 can be extracted, increasing the amount of refrigerant participating in the circulation in the heat exchange system 100 and improving the energy efficiency of the heat exchange system 100.

[0097] Optionally, obtaining the operating parameters of the heat exchange system 100 includes obtaining the low-pressure value of the heat exchange system 100 and the suction superheat value of the heat exchange system 100. That is, the operating parameters here can be either the low-pressure value of the heat exchange system 100 or the suction superheat value of the heat exchange system 100. The low-pressure value of the heat exchange system 100 can be the pressure value at the suction port of the compressor 11, which can be detected by setting a pressure sensor. The suction superheat value here refers to the difference between the suction temperature at the suction port of the compressor 11 and the low-pressure saturation temperature corresponding to the low-pressure value. The suction temperature at the suction port of the compressor 11 can be obtained by measuring with a temperature sensor. The low-pressure saturation temperature refers to the saturation temperature corresponding to the pressure detected by the pressure sensor on the low-pressure side of the compressor 11. This can be obtained by using a steam gauge and looking up the value in a table, or by using calculation software to calculate the corresponding saturation temperature value by inputting the low-pressure value.

[0098] Optionally, controlling the heat exchange system 100 to switch from a simultaneous cooling and heating mode to another mode based on the operating parameters meeting the first preset condition includes controlling the heat exchange system 100 to switch from a simultaneous cooling and heating mode to another mode based on the low pressure of the heat exchange system 100 being less than a first preset pressure value and the duration being greater than a first preset value, and / or controlling the heat exchange system 100 to switch from a simultaneous cooling and heating mode to another mode based on the suction superheat being greater than a first preset suction value and the duration being greater than a second preset value.

[0099] Among them, the low pressure and suction superheat of the heat exchange system 100 are both operating parameters that can be measured separately, and the mode of the heat exchange system 100 can be switched based on at least one of the two parameters.

[0100] The other mode here can be either heating mode or cooling mode, which will be described in detail later with reference to Figures 5 and 6.

[0101] Optionally, the heat exchange system 100 further includes a liquid storage component 21 and a refrigerant regulating pipeline 20. The refrigerant regulating pipeline 20 is connected to the refrigerant circulation pipeline 10 in parallel, and the liquid storage component 21 is provided on the refrigerant regulating pipeline 20. Controlling the heat exchange system 100 to switch from a simultaneous cooling and heating mode to another mode includes controlling the heat exchange system 100 to switch from a simultaneous cooling and heating mode to a separate cooling mode. When the heat exchange system 100 is in the cooling mode, the liquid storage component 21 is connected to the refrigerant circulation pipeline 10 and is used to supply refrigerant to the refrigerant circulation pipeline 10.

[0102] It should be noted that the first valve 24 is a normally closed solenoid valve. When the heat exchange system 100 is in the cooling mode, the first valve 24 is energized and opened, so that the liquid storage component 21 is connected to the suction port of the compressor 11, and the refrigerant in the liquid storage component 21 during standby is also drawn back into the heat exchange system 100 to participate in the refrigerant circulation, thereby providing more refrigerant to the heat exchange system 100.

[0103] Optionally, the heat exchange system 100 further includes a liquid storage component 21 and a refrigerant regulating pipeline 20, wherein the refrigerant regulating pipeline 20 is connected in parallel with the refrigerant circulation pipeline 10, and the liquid storage component 21 is provided on the refrigerant regulating pipeline 20; controlling the heat exchange system 100 to switch from a simultaneous cooling and heating mode to another mode includes controlling the heat exchange system 100 to switch from a simultaneous cooling and heating mode to a separate heating mode, wherein the liquid storage component 21 and the refrigerant circulation pipeline 10 are selectively connected.

[0104] It should be noted that the selective connection between the liquid storage component 21 and the refrigerant circulation pipe 10 means that the two can be in a disconnected state or a connected state, and the connection state between the liquid storage component 21 and the refrigerant circulation pipe 10 can be selected as needed.

[0105] When the heat exchange system 100 is in heat exchange mode, under normal circumstances, refrigerant will enter the liquid storage assembly 21 from the refrigerant circulation pipe 10. Therefore, in order to allow more refrigerant to flow in the refrigerant circulation pipe 10, the first valve 24 can be closed, that is, the liquid storage assembly 21 and the refrigerant circulation pipe 10 are disconnected, reducing the probability of refrigerant entering the liquid storage assembly 21. Of course, the liquid storage assembly 21 and the refrigerant circulation pipe 10 can also be connected, as long as the amount of refrigerant provided by the air-cooled heat exchanger 13 is greater than the amount of refrigerant entering the liquid storage assembly 21, which can also increase the amount of refrigerant in the refrigerant circulation pipe of the heat exchange system 100.

[0106] The control method for the heat exchange system 100 will be described in detail below with reference to Figure 5. The control method includes:

[0107] S51. Start the heat exchange system 100 in simultaneous cooling and heating mode;

[0108] S52. Obtain the operating time of the heat exchange system 100;

[0109] S53. Obtain the low pressure and intake superheat based on the runtime being greater than or equal to the first preset duration;

[0110] S54. Compare whether the inhalation superheat is greater than the first inhalation preset value B;

[0111] S55. If so, compare whether the duration is greater than the second preset value P;

[0112] S56. If yes, switch to standalone cooling mode; otherwise, return to S54.

[0113] S57. Run the heat exchange system in cooling mode for 100 hours until the second preset duration;

[0114] S58, Switch to simultaneous cooling and heating mode;

[0115] S59. The heat exchange system 100 operates in simultaneous cooling and heating mode;

[0116] S541. Compare whether the low pressure is less than the preset value A of the first pressure;

[0117] S542. If yes, then compare whether the duration is greater than the first preset value M. If yes, then proceed to S56. If no, then proceed to S59 to realize the cyclic control of the heat exchange system 100.

[0118] The first pressure preset value A here can be a range value or a specific value, such as 5 bar to 10 bar, or 6 bar or 7 bar. The first intake preset value B here can be a range value or a specific value, such as 5 degrees Celsius to 15 degrees Celsius, or 10 degrees Celsius or 12 degrees Celsius. The first preset value M here can be 1 minute to 5 minutes, such as 2 minutes or 3 minutes. The second preset value P here can be 15 minutes to 25 minutes, such as 20 minutes or 22 minutes. The second preset duration here can be determined according to the ambient temperature of the heat exchange system 100, such as 3 minutes to 8 minutes, or 5 minutes or 6 minutes.

[0119] In this application, the control method can extract the refrigerant in the liquid storage component 21 and the refrigerant in the air-cooled heat exchanger 13 into the refrigerant circulation pipeline 10, thereby increasing the amount of refrigerant in the refrigerant circulation pipeline 10 and improving the energy efficiency of the heat exchange system 100.

[0120] The control method for the heat exchange system 100 will be described in detail below with reference to Figure 6. The control method includes:

[0121] S61. Start the heat exchange system 100 in simultaneous cooling and heating mode;

[0122] S62. Obtain the operating time of the heat exchange system 100;

[0123] S63. Obtain the low pressure and intake superheat based on the runtime being greater than or equal to the first preset duration;

[0124] S64. Compare whether the inhalation superheat is greater than the first inhalation preset value B;

[0125] S65. If so, compare whether the duration is greater than the second preset value P;

[0126] S66. If yes, switch to standalone heating mode; otherwise, return to S54.

[0127] S67. Operate the heat exchange system in heating mode for 100 hours to the second preset duration;

[0128] S68, Switch to simultaneous cooling and heating mode;

[0129] S69. The heat exchange system 100 operates in simultaneous cooling and heating mode;

[0130] S641. Compare whether the low pressure is less than the preset value A of the first pressure;

[0131] S642. If yes, compare whether the duration is greater than the first preset value M. If yes, proceed to S66. If no, proceed to S69 to realize the cyclic control of the heat exchange system 100.

[0132] It should be noted that the other mode here is the heating mode. The control method of this application can extract at least part of the refrigerant in the air-cooled heat exchanger 13 into the refrigerant circulation pipe 10, increase the amount of refrigerant in the refrigerant circulation pipe 10, and improve the energy efficiency of the heat exchange system 100.

[0133] The second aspect of this application discloses a control device, as shown in FIG7. The control device includes a first acquisition module 30, a second acquisition module 40, and a control module 50. The first acquisition module 30 is used to acquire the running time of the heat exchange system 100 in the simultaneous cooling and heating mode. The second acquisition module 40 is used to acquire the operating parameters of the heat exchange system 100 based on the running time being greater than or equal to a first preset time. The control module 50 is used to control the heat exchange system 100 to switch from the simultaneous cooling and heating mode to another mode based on the operating parameters meeting the first preset condition. The control module 50 is also used to control the heat exchange system 100 to switch from the other mode to the simultaneous cooling and heating mode based on the running time of the heat exchange system 100 in the other mode being greater than a second preset time.

[0134] It should be noted that the second acquisition module 40 here has acquisition function, comparison function and control function, and the control module 50 has control function and comparison function.

[0135] Other functions of the control device can be found in the description of the control method, which enables the control device to implement the entire process of the control method. They will not be described in detail here.

[0136] A third aspect of this application provides a heating, ventilation, and air conditioning (HVAC) device, which includes a memory, a processor, and an air conditioning system control program stored in the memory and running on the processor. The air conditioning system control program is configured to implement the control method of the heat exchange system 100 mentioned in the above embodiments.

[0137] The HVAC equipment here can be a heat pump type or other types of HVAC equipment.

[0138] The fourth aspect of this application proposes a storage medium storing an air conditioning system control program, which, when executed by a processor, implements the control method of the heat exchange system 100 as described in the above embodiments.

[0139] For the structure of other parts of this application, please refer to the prior art; further details will not be provided here.

[0140] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A control method for a heat exchange system, the heat exchange system comprising an air-cooled heat exchanger and a refrigerant circulation pipeline, wherein, The control method includes: Obtain the operating time of the heat exchange system in simultaneous cooling and heating mode; The operating parameters of the heat exchange system are obtained based on the running time being greater than or equal to the first preset time. Based on the fact that the operating parameters meet the first preset condition, the heat exchange system is controlled to switch from the simultaneous cooling and heating mode to another mode. Based on the duration of operation of the heat exchange system in the other mode up to a second preset duration, control the heat exchange system to switch from the other mode to the simultaneous cooling and heating mode; When the heat exchange system is in simultaneous cooling and heating mode, the air-cooled heat exchanger is disconnected from the refrigerant circulation pipeline and does not participate in the refrigerant circulation. When the heat exchange system is in the other mode, the air-cooled heat exchanger is connected to the refrigerant circulation pipeline and participates in the refrigerant circulation.

2. The control method for the heat exchange system as described in claim 1, wherein, Obtaining the operating parameters of the heat exchange system includes obtaining the low-pressure of the heat exchange system and obtaining the intake superheat of the heat exchange system.

3. The control method for the heat exchange system as described in claim 2, wherein, The step of controlling the heat exchange system to switch from the simultaneous cooling and heating mode to another mode based on the operating parameters meeting the first preset condition includes: The low pressure of the heat exchange system is less than a first preset pressure value and the duration is greater than a first preset value, and / or the suction superheat is greater than a first preset suction value and the duration is greater than a second preset value. Control the heat exchange system to switch from the simultaneous cooling and heating mode to the other mode.

4. The control method for the heat exchange system as described in claim 3, wherein, The heat exchange system also includes a liquid storage component and a refrigerant regulating pipeline. The refrigerant regulating pipeline is connected to the refrigerant circulation pipeline in parallel, and the liquid storage component is installed on the refrigerant regulating pipeline. The step of controlling the heat exchange system to switch from the simultaneous cooling and heating mode to the other mode includes: Control the heat exchange system to switch from the simultaneous cooling and heating mode to the standby cooling mode; When the heat exchange system is in the cooling mode, the liquid storage component is connected to the refrigerant circulation pipeline and is used to supply refrigerant to the refrigerant circulation pipeline.

5. The control method for the heat exchange system as described in claim 3, wherein, The heat exchange system also includes a liquid storage component and a refrigerant regulating pipeline. The refrigerant regulating pipeline is connected to the refrigerant circulation pipeline in parallel, and the liquid storage component is installed on the refrigerant regulating pipeline. The step of controlling the heat exchange system to switch from the simultaneous cooling and heating mode to the other mode includes: The heat exchange system is controlled to switch from the simultaneous cooling and heating mode to the standby heating mode, wherein the liquid storage component and the refrigerant circulation pipeline are disconnected.

6. The control method for the heat exchange system as described in claim 5, wherein, The refrigerant regulating pipeline is equipped with a first valve and a second valve, which are respectively located at both ends of the liquid storage component.

7. The control method for the heat exchange system according to any one of claims 1 to 6, wherein, The first preset duration is in the range of 3 to 10 minutes, and / or the second preset duration is in the range of 3 to 10 minutes.

8. A control device, wherein, The control device includes: The first acquisition module is used to acquire the running time of the heat exchange system in simultaneous cooling and heating mode; The second acquisition module is used to acquire the operating parameters of the heat exchange system based on the running time being greater than or equal to the first preset time. The control module is configured to control the heat exchange system to switch from the simultaneous cooling and heating mode to another mode according to the first preset condition of the operating parameters, and to control the heat exchange system to switch from the other mode to the simultaneous cooling and heating mode according to the running time of the heat exchange system in the other mode being greater than the second preset time.

9. A heating, ventilation, and air conditioning (HVAC) device, wherein, The HVAC equipment includes: a memory, a processor, and an air conditioning system control program stored in the memory and running on the processor, the air conditioning system control program being configured to implement the control method of the heat exchange system as described in any one of claims 1 to 7.

10. A storage medium, wherein, The storage medium stores an air conditioning system control program, which, when executed by a processor, implements the control method for the heat exchange system as described in any one of claims 1 to 7.

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