Ice storage air conditioning system and control method thereof

Abstract

The invention provides an ice storage air conditioning system and a control method thereof, particularly relates to the technical field of air conditioners, and is used for switching working modes so as to reduce the power consumption cost of the ice storage air conditioning system under the condition that the cold consumption requirement is met. The ice storage air-conditioning system comprises a main machine, wherein the main machine comprises a refrigerating loop consisting of a compressor, a condenser, a first throttling device and an evaporator; the ice storage system comprises an ice storage tank, a second throttling device and a refrigerant pump; the switching assembly is used for controlling at least one of the following items: the second end of the ice storage tank is communicated with the first input end of the compressor, the second end of the ice storage tank is communicated with the refrigerant output end of the evaporator, and the refrigerant output end of the evaporator is communicated with the first input end of the compressor; therefore, the ice storage air-conditioning system can be in any one of the following working modes: a main machine refrigeration mode, an ice storage system refrigeration mode, an ice making mode, a main machine and ice storage system combined refrigeration mode and a main machine refrigeration and ice making mode.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, and in particular to an ice storage air conditioning system and its control method. Background Technology

[0002] Ice storage air conditioning system is an air conditioning system that uses the latent heat of phase change of ice to store cold energy. It stores cold energy by making ice and releases the stored cold energy by melting the ice.

[0003] In related technologies, ice storage air conditioning systems often achieve cooling by melting ice. Ice is stored to store cold energy when cooling is not needed. However, since there is a certain amount of heat loss when melting ice after storage, it is easy to waste resources and increase the user's electricity costs.

[0004] Therefore, how to reduce the electricity cost of ice storage air conditioning systems is an urgent problem to be solved. Summary of the Invention

[0005] This application provides an ice storage air conditioning system and its control method, which reduces the electricity cost of the ice storage air conditioning system while meeting cooling demand.

[0006] To achieve the above objectives, the embodiments of this application adopt the following technical solutions:

[0007] Firstly, an ice storage air conditioning system is provided, comprising:

[0008] The main unit includes a refrigeration circuit consisting of a compressor, a condenser, a first throttling device, and an evaporator.

[0009] An ice storage system includes an ice storage tank, a second throttling device, and a refrigerant pump. The first end of the ice storage tank, the first end of the refrigerant pump, and the first end of the second throttling device are connected together. The second end of the refrigerant pump, the refrigerant input end of the evaporator, and the output end of the first throttling device are connected together. The second end of the second throttling device is connected to the input end of the first throttling device.

[0010] A switching component is used to control at least one of the following: the second end of the ice storage tank is connected to the first input end of the compressor, the second end of the ice storage tank is connected to the refrigerant output end of the evaporator, and the refrigerant output end of the evaporator is connected to the first input end of the compressor, so that the ice storage air conditioning system is in any of the following operating modes: main unit cooling mode, ice storage system cooling mode, ice making mode, main unit combined with ice storage system cooling mode, and main unit cooling and ice making mode.

[0011] The technical solution provided in this application provides at least the following beneficial effects: By controlling the second end of the ice storage tank to be connected to the first input end of the compressor through the switching component, the refrigerant pumped out by the compressor can exchange heat in the condenser and then exchange heat with the water in the ice storage tank; by controlling the second end of the ice storage tank to be connected to the refrigerant output end of the evaporator through the switching component, the refrigerant in the evaporator can exchange heat with the water in the ice storage tank; by controlling the refrigerant output end of the evaporator to be connected to the first input end of the compressor through the switching component, the refrigerant pumped out by the compressor can exchange heat in the evaporator. This allows the ice storage air conditioning system to operate in different modes, thereby reducing the electricity cost of the ice storage air conditioning system while meeting cooling demand.

[0012] In some embodiments, in the main unit cooling mode, the switching component controls the refrigerant output terminal of the evaporator to be connected to the first input terminal of the compressor, the first throttling device is on, the second throttling device is off, and the refrigerant pump is off; in the ice storage system cooling mode, the switching component controls the second end of the ice storage tank to be connected to the refrigerant output terminal of the evaporator, the first and second throttling devices are off, and the refrigerant pump is on; in the ice making mode, the switching component controls the second end of the ice storage tank to be connected to the first input terminal of the compressor, the first throttling device is off, the second throttling device is on, and the refrigerant pump is off; in the main unit combined with ice storage system cooling mode, the switching component controls the second end of the ice storage tank to be connected to the first input terminal of the compressor and the second end of the ice storage tank to be connected to the refrigerant output terminal of the evaporator, the first throttling device is on, the second throttling device is off, and the refrigerant pump is on; in the main unit cooling and ice making mode, the switching component controls the second end of the ice storage tank to be connected to the first input terminal of the compressor and the second end of the ice storage tank to the refrigerant output terminal of the evaporator, the first and second throttling devices are on, and the refrigerant pump is off.

[0013] In some embodiments, the switching component includes: a first shut-off valve, a second shut-off valve, and a third shut-off valve. The first end of the first shut-off valve is connected to the second end of the ice storage tank; the second end of the first shut-off valve is connected to the first ends of both the second and third shut-off valves; the second end of the second shut-off valve is connected to the first input end of the compressor; and the second end of the third shut-off valve is connected to the refrigerant output end of the evaporator. When the first and second shut-off valves are open and the third shut-off valve is closed, the second end of the ice storage tank is connected to the first input end of the compressor, the second end of the ice storage tank is not connected to the refrigerant output end of the evaporator, and the refrigerant output end of the evaporator is not connected to the first input end of the compressor. When the first and third shut-off valves are open and the second shut-off valve is closed... When the ice storage tank is open, the second end of the ice storage tank is connected to the refrigerant output end of the evaporator, and the second end of the ice storage tank is not connected to the first input end of the compressor; when the first shut-off valve, the second shut-off valve, and the third shut-off valve are all open, the second end of the ice storage tank is connected to the first input end of the compressor, the second end of the ice storage tank is connected to the refrigerant output end of the evaporator, and the refrigerant output end of the evaporator is connected to the first input end of the compressor; when the first shut-off valve is closed and the second shut-off valve and the third shut-off valve are open, the refrigerant output end of the evaporator is connected to the first input end of the compressor, and the second end of the ice storage tank is not connected to the first input end of the compressor; when the second end of the ice storage tank is closed and the second shut-off valve and the third shut-off valve are open, the refrigerant output end of the evaporator is connected to the first input end of the compressor, and the second end of the ice storage tank is not connected to the refrigerant output end of the evaporator.

[0014] In some embodiments, the host unit further includes an economizer and a third throttling device; the first input terminal of the economizer is connected to the refrigerant output terminal of the condenser, the first output terminal of the economizer is connected to the second input terminal of the compressor, the second input terminal of the economizer is connected to the output terminal of the third throttling device, and the second output terminal of the economizer is connected to the input terminal of the first throttling device; the input terminal of the third throttling device is connected to the refrigerant output terminal of the condenser.

[0015] In some embodiments, the third throttling device is activated in the main unit cooling mode, ice-making mode, main unit combined with ice storage system cooling mode, and main unit cooling and ice-making mode; and the third throttling device is deactivated in the ice storage system cooling mode.

[0016] In some embodiments, the ice storage air conditioning system further includes a cooling tower system, which includes a cooling tower and a cooling water pump; the input end of the cooling tower is connected to the cooling water output end of the condenser, and the output end of the cooling tower is connected to the input end of the cooling water pump; the output end of the cooling water pump is connected to the cooling water input end of the condenser.

[0017] In some embodiments, the above-mentioned ice storage air conditioning system further includes an air conditioning terminal, which includes a terminal heat exchanger and a chilled water pump; the input end of the terminal heat exchanger is connected to the chilled water output end of the evaporator, and the output end of the terminal heat exchanger is connected to the input end of the chilled water pump; the output end of the chilled water pump is connected to the chilled water input end of the evaporator.

[0018] In some embodiments, the ice storage air conditioning system further includes a controller, which is configured to: in response to an instruction to operate a cooling mode, determine a target electricity price corresponding to the current time based on the correspondence between time and electricity price; acquire a first cooling capacity of the main unit, a second cooling capacity of the ice storage system, and the cooling demand of the air conditioning terminal; and determine a target operating mode based on the target electricity price, the first cooling capacity, the second cooling capacity, and the cooling demand, wherein the target operating mode is any of the following operating modes: main unit cooling mode, ice storage system cooling mode, ice making mode, main unit combined with ice storage system cooling mode, and main unit cooling and ice making mode.

[0019] In some embodiments, the controller is specifically configured to: determine a target operating mode as main unit cooling mode when the target electricity price is below a first preset electricity price, the first cooling capacity is above the cooling demand, and the second cooling capacity is above the upper limit of the cooling capacity; determine a target operating mode as main unit cooling and ice making mode when the first cooling capacity is above the cooling demand and the second cooling capacity is below the upper limit of the cooling capacity; determine a target operating mode as main unit combined with ice storage system cooling mode when the first cooling capacity is below the cooling demand and the second cooling capacity is above the lower limit of the cooling capacity; determine a target operating mode as main unit cooling mode when the first cooling capacity is below the cooling demand and the second cooling capacity is below the lower limit of the cooling capacity; and determine a target operating mode as main unit cooling mode when the target electricity price is above a second preset electricity price and the second cooling capacity is below the lower limit of the cooling capacity. The target operating mode is the main unit cooling mode; when the second cooling capacity is above the cooling demand, the target operating mode is determined to be the ice storage system cooling mode; when the second cooling capacity is above the lower limit of the cooling capacity and below the cooling demand, the target operating mode is determined to be the main unit combined with the ice storage system cooling mode; the second preset electricity price is above the first preset electricity price; in response to the target electricity price being between the first and second preset electricity prices, when the second cooling capacity is below the lower limit of the cooling capacity, the target operating mode is determined to be the main unit cooling mode; when the second cooling capacity is above the lower limit of the cooling capacity and the first cooling capacity is above the cooling demand, the target operating mode is determined to be the main unit cooling mode; when the second cooling capacity is above the lower limit of the cooling capacity and the first cooling capacity is below the cooling demand, the target operating mode is determined to be the main unit combined with the ice storage system cooling mode.

[0020] Secondly, embodiments of this application provide a control method for an ice storage air conditioning system, the method comprising:

[0021] In response to the command to operate in cooling mode, the target electricity price corresponding to the current time is determined based on the correspondence between time and electricity price;

[0022] Obtain the first cooling capacity of the main unit, the second cooling capacity of the ice storage system, and the cooling demand of the air conditioning terminals;

[0023] Based on the target electricity price, the first cooling capacity, the second cooling capacity, and the cooling demand, the target operating mode is determined. The target operating mode is any of the following: main unit cooling mode, ice storage system cooling mode, ice making mode, main unit combined with ice storage system cooling mode, and main unit cooling and ice making mode.

[0024] As can be seen from the above embodiments, this application takes into account that the first cooling capacity, the second cooling capacity, and the cooling demand of the air conditioning terminal are constantly changing. The ice storage air conditioning system can select different cooling modes to meet the cooling demand of the air conditioning terminal. In addition, the power consumption of the main unit cooling and the ice storage system cooling are different. When the ice storage system is cooling, the compressor does not work, and the power consumption of the ice storage system is less than that of the main unit cooling. The embodiments of this application determine the target operating mode based on the first cooling capacity, the second cooling capacity, the cooling demand, and the target electricity price, which can reduce the power cost of the ice storage air conditioning system while meeting the cooling demand.

[0025] Thirdly, embodiments of this application provide a controller, including: one or more processors; one or more memories; wherein the one or more memories are used to store computer program code, the computer program code including computer instructions, and when the one or more processors execute the computer instructions, the controller executes the control method of the ice storage air conditioning system provided in the second aspect.

[0026] Fourthly, embodiments of this application provide a computer-readable storage medium including computer instructions that, when controlled on a computer, cause the computer to execute the control method for the ice storage air conditioning system provided in the second aspect and possible implementations.

[0027] Fifthly, embodiments of the present invention provide a computer program product that can be directly loaded into a memory and contains software code. After being loaded and executed by a computer, the computer program product can realize the control method of the ice storage air conditioning system provided in the second aspect and possible implementations.

[0028] It should be noted that the aforementioned computer instructions may be stored, in whole or in part, on a computer-readable storage medium. This computer-readable storage medium may be packaged together with the controller's processor, or it may be packaged separately from the controller's processor; this application does not impose any limitations on this. Attached Figure Description

[0029] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solutions of the present invention and do not constitute a limitation on the technical solutions of the present invention.

[0030] Figure 1 A schematic diagram of the structure of an ice storage air conditioning system provided in this application embodiment. Figure 1 ;

[0031] Figure 2 A schematic diagram of the structure of an ice storage air conditioning system provided in this application embodiment. Figure 2 ;

[0032] Figure 3 A schematic diagram of the structure of an ice storage air conditioning system provided in this application embodiment. Figure 3 ;

[0033] Figure 4 A schematic diagram of the structure of an ice storage air conditioning system provided in this application embodiment. Figure 4 ;

[0034] Figure 5 A schematic diagram of the structure of an ice storage air conditioning system provided in this application embodiment. Figure 5 ;

[0035] Figure 6 A schematic diagram of the structure of an ice storage air conditioning system provided in this application embodiment. Figure 6 ;

[0036] Figure 7 A schematic diagram of the structure of an ice storage air conditioning system provided in this application embodiment. Figure 7 ;

[0037] Figure 8 A schematic diagram of the structure of an ice storage air conditioning system provided in this application embodiment. Figure 8 ;

[0038] Figure 9 A schematic diagram of the structure of an ice storage air conditioning system provided in this application embodiment. Figure 9 ;

[0039] Figure 10 A schematic diagram of the structure of an ice storage air conditioning system provided in this application embodiment. Figure 10 ;

[0040] Figure 11 A schematic diagram of the structure of an ice storage air conditioning system provided in this application embodiment. Figure 10 one;

[0041] Figure 12 A schematic diagram of the structure of an ice storage air conditioning system provided in this application embodiment. Figure 10 two;

[0042] Figure 13 A schematic diagram of the structure of an ice storage air conditioning system provided in this application embodiment. Figure 10 three;

[0043] Figure 14 A schematic diagram of the hardware structure of a controller provided in an embodiment of this application;

[0044] Figure 15 A flowchart illustrating a control method for an ice storage air conditioning system provided in this application embodiment. Figure 1 ;

[0045] Figure 16 A flowchart illustrating a control method for an ice storage air conditioning system provided in this application embodiment. Figure 2 ;

[0046] Figure 17 A flowchart illustrating a control method for an ice storage air conditioning system provided in this application embodiment. Figure 3 ;

[0047] Figure 18 A flowchart illustrating a control method for an ice storage air conditioning system provided in this application embodiment. Figure 4 . Detailed Implementation

[0048] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0049] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0050] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0051] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone.

[0052] The terms “comprising” and “having”, and any variations thereof, used in the description of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include other steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0053] Furthermore, in the embodiments of this application, the words "exemplary" or "for example" are used to indicate that they are examples, illustrations, or descriptions. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design options. Specifically, the use of the words "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0054] As described in the background section, an ice storage air conditioning system is an air conditioning system that uses the latent heat of phase change of ice to store cold energy. It stores cold energy by making ice and releases the stored cold energy by melting the ice.

[0055] In related technologies, ice storage air conditioning systems often achieve cooling by melting ice. Ice is stored to store cold energy when cooling is not needed. However, melting ice after storage results in a certain amount of heat loss, which wastes resources and increases the user's electricity costs.

[0056] Therefore, how to reduce the electricity cost of ice storage air conditioning systems while meeting cooling demand is an urgent problem to be solved.

[0057] In view of this, this application controls the second end of the ice storage tank to be connected to the first input end of the compressor via a switching component, allowing the refrigerant pumped out by the compressor to exchange heat in the condenser before exchanging heat with the water in the ice storage tank; controls the second end of the ice storage tank to be connected to the refrigerant output end of the evaporator via the switching component, allowing the refrigerant in the evaporator to exchange heat with the water in the ice storage tank; controls the refrigerant output end of the evaporator to be connected to the first input end of the compressor via the switching component, allowing the refrigerant pumped out by the compressor to exchange heat in the evaporator. This allows the ice storage air conditioning system to operate in different modes. Furthermore, the power consumption of the main unit cooling and the ice storage system cooling is different; when the ice storage system is cooling, the compressor does not work, and the power consumption of the ice storage system is less than that of the main unit cooling. The embodiments of this application determine the target operating mode based on the first cooling capacity, the second cooling capacity, the cooling demand, and the target electricity price, which can reduce the electricity cost of the ice storage air conditioning system while meeting the cooling demand.

[0058] To further describe the technical solutions of the embodiments of this application, as follows: Figure 1 The diagram shown is a structural schematic of an ice storage air conditioning system provided in an embodiment of this application.

[0059] Reference Figure 1 The ice storage air conditioning system 1 includes a main unit 10.

[0060] In some embodiments, the host unit 10 may include a compressor 101 for providing power for refrigerant circulation. The compressor 101 has an input terminal and an output terminal, with the refrigerant flowing from the input terminal to the output terminal. The refrigerant used in this application may be fluorine or other types of refrigerants; the embodiments of this application do not limit the type of refrigerant.

[0061] The main unit 10 may also include a condenser 102 for exchanging heat between the refrigerant flowing through the condenser 102 and the cooling water flowing through the condenser 102, thereby transferring heat from the refrigerant to the cooling water. The refrigerant inlet of the condenser 102 is connected to the output of the compressor 101.

[0062] The main unit 10 may also include a first throttling device 103, used to control the flow rate and pressure of the refrigerant by changing the cross-sectional area of ​​the refrigerant flow channel. Before passing through the first throttling device 103, the refrigerant is usually in a high-temperature, high-pressure liquid or gas-liquid mixture state. After passing through the first throttling device 103, the refrigerant is in a low-temperature, low-pressure liquid or gas-liquid mixture state. The output end of the first throttling device 103 is connected to the refrigerant input end of the evaporator 104 and the second end of the refrigerant pump 203. The input end of the first throttling device 103 is connected to the refrigerant output end of the condenser 102 and the first end of the refrigerant pump 203.

[0063] For example, the first throttling device 103 can be an electronic expansion valve, a thermostatic expansion valve, or a capillary tube, etc.

[0064] The main unit 10 may further include an evaporator 104 for heat exchange between chilled water and refrigerant flowing through the evaporator 104. The evaporator 104 has a refrigerant inlet and a refrigerant outlet. The refrigerant inlet of the evaporator 104 is connected to the output of the first throttling device 103, and the refrigerant outlet of the evaporator 104 is connected to the first input of the compressor. The evaporator 104 also has a chilled water inlet and a chilled water outlet. The chilled water inlet of the evaporator 104 is connected to a chilled water pump, and the chilled water outlet of the evaporator 104 is connected to a terminal heat exchanger.

[0065] The compressor 101, condenser 102, first throttling device 103 and evaporator 104 together constitute a refrigeration circuit.

[0066] Continue to refer to Figure 1 The ice storage air conditioning system 1 also includes an ice storage system 20.

[0067] In some embodiments, the ice storage system 20 may include an ice storage tank 201 for exchanging heat between the refrigerant flowing through the ice storage tank 201 and the liquid (typically water) in the ice storage tank 201. In ice-making mode, the water in the ice storage tank 201 condenses into ice; in ice storage system cooling mode, the ice in the ice storage tank 201 melts into water. A first end of the ice storage tank 201 is connected to a switching component 30, and a second end of the ice storage tank 201 is connected to a second throttling device 202. Through the cold storage and release process of the ice storage tank 201, the ice storage air conditioning system 1 can effectively avoid operating the refrigeration equipment during peak electricity price periods during the day, thereby reducing the system's operating costs. Simultaneously, since the grid load is lower and the power supply is relatively abundant at night, the use of the ice storage tank 201 also helps alleviate the peak-valley contradiction of the power grid and improve the operating efficiency of the power grid.

[0068] For example, the ice storage tank 201 can be an ice tray type ice storage tank, a fully frozen ice storage tank, an ice ball type ice storage tank, etc.

[0069] The ice storage system 20 may further include a second throttling device 202, which controls the flow rate and pressure of the refrigerant by changing the cross-sectional area of ​​the refrigerant flow channel. Before passing through the second throttling device 202, the refrigerant is typically in a high-temperature, high-pressure liquid or gas-liquid mixture state; after passing through the second throttling device 202, the refrigerant is in a low-temperature, low-pressure liquid or gas-liquid mixture state. The first end of the second throttling device 202 is connected to the first end of the ice storage tank 201, and the second end of the second throttling device 202 is connected to the input end of the first throttling device 103.

[0070] The ice storage system 20 may also include a refrigerant pump 203 for powering the refrigerant circulation between the ice storage tank 201 and the evaporator 104. A first end of the refrigerant pump 203 is connected to a first end of the ice storage tank 201, and a second end is connected to the refrigerant inlet of the evaporator 104.

[0071] Continue to refer to Figure 1 The ice storage air conditioning system 1 may further include a switching component 30 for controlling at least one of the following: the second end of the ice storage tank 201 is connected to the input end of the compressor 101, the second end of the ice storage tank 201 is connected to the refrigerant output end of the evaporator 104, and the refrigerant output end of the evaporator 104 is connected to the input end of the compressor 101, so that the ice storage air conditioning system 1 is in any of the following operating modes: main unit cooling mode, ice storage system cooling mode, ice making mode, main unit combined with ice storage system cooling mode, and main unit cooling and ice making mode.

[0072] By controlling the second end of the ice storage tank 201 to be connected to the first input end of the compressor 101 through the switching component 30, the refrigerant pumped out by the compressor 101 can exchange heat in the condenser 102 and then exchange heat with the water in the ice storage tank 201. Similarly, by controlling the second end of the ice storage tank 201 to be connected to the refrigerant output end of the evaporator 104 through the switching component 30, the refrigerant in the evaporator 104 can exchange heat with the water in the ice storage tank 201. Furthermore, by controlling the refrigerant output end of the evaporator 104 to be connected to the first input end of the compressor 101 through the switching component 30, the refrigerant pumped out by the compressor 101 can exchange heat in the evaporator 104. This allows the ice storage air conditioning system 1 to operate in different modes, thereby reducing the electricity cost of the ice storage air conditioning system while meeting cooling demand.

[0073] In some embodiments, such as Figure 2 As shown, the switching component 30 includes a first shut-off valve 301, a second shut-off valve 302, and a third shut-off valve 303.

[0074] When the first shut-off valve 301 and the second shut-off valve 302 are open and the third shut-off valve 303 is closed, the second end of the ice storage tank 201 is connected to the first input end of the compressor 101, the second end of the ice storage tank 201 is not connected to the refrigerant output end of the evaporator 104, and the refrigerant output end of the evaporator 104 is not connected to the first input end of the compressor 101.

[0075] With the first shut-off valve 301 and the third shut-off valve 303 open and the second shut-off valve 302 closed, the second end of the ice storage tank 201 is connected to the refrigerant output end of the evaporator 104, the second end of the ice storage tank 201 is not connected to the first input end of the compressor 101, and the refrigerant output end of the evaporator 104 is not connected to the first input end of the compressor 101.

[0076] When the first shut-off valve 301, the second shut-off valve 302, and the third shut-off valve 303 are all open, the second end of the ice storage tank 201 is connected to the first input end of the compressor 101, the second end of the ice storage tank 201 is connected to the refrigerant output end of the evaporator 104, and the refrigerant output end of the evaporator 104 is connected to the first input end of the compressor 101.

[0077] When the first shut-off valve 301 is closed and the second shut-off valve 302 and the third shut-off valve 303 are open, the refrigerant output terminal of the evaporator 104 is connected to the first input terminal of the compressor 101, the second terminal of the ice storage tank 201 is not connected to the first input terminal of the compressor 101, and the second terminal of the ice storage tank 201 is not connected to the refrigerant output terminal of the evaporator 104.

[0078] like Figure 3 The diagram shows the structure of an ice storage air conditioning system 1. This ice storage air conditioning system 1 may also include an economizer 107. The economizer 107, also known as an economic pressure controller, mainly functions during the superheat stage of the refrigeration cycle. By throttling and evaporating a portion of the refrigerant to absorb heat, it subcools another portion of the refrigerant, thereby improving refrigeration efficiency and reducing energy consumption. The first input terminal of the economizer 107 is connected to the refrigerant output terminal of the condenser 102, the first output terminal of the economizer 107 is connected to the input terminal of the compressor 101, the second input terminal of the economizer 107 is connected to the output terminal of the third throttling device 108, and the second output terminal of the economizer 107 is connected to the input terminal of the first throttling device 103.

[0079] The ice storage air conditioning system 1 may further include a third throttling device 108, which is used to throttle and reduce the pressure of the high-temperature, high-pressure liquid refrigerant output from the condenser 102, so as to output a medium-temperature, medium-pressure gas-liquid mixture refrigerant. The input end of the third throttling device 108 is connected to the refrigerant output end of the condenser 102.

[0080] The high-temperature, high-pressure refrigerant flowing out of the condenser 102 flows directly into the economizer 107 through its first input terminal; the other part flows into the third throttling device 108 through its input terminal, where it is throttled to become a medium-temperature, medium-pressure refrigerant before flowing into the economizer 107 through its second input terminal. The high-temperature, high-pressure refrigerant flowing directly into the economizer 107 and the medium-temperature, medium-pressure refrigerant flowing into the economizer 107 after throttling exchange heat in the economizer 107. The gaseous refrigerant after heat exchange flows into the compressor 101 through the first output terminal of the economizer 107, and the subcooled liquid refrigerant after heat exchange flows to the first throttling device 103 through the second output terminal of the economizer 107.

[0081] like Figure 4The schematic diagram of the ice storage air conditioning system shown in this application indicates that the ice storage air conditioning system 1 may also include a cooling tower system 60.

[0082] Optionally, the cooling tower system 60 includes a cooling water tower 601, which transfers waste heat to the atmosphere by exchanging heat between cooling water carrying waste heat and air within the cooling water tower 601. The input end of the cooling water tower 601 is connected to the cooling water output end of the condenser 102, and the output end of the cooling water tower 601 is connected to the input end of the cooling water pump 602.

[0083] Optionally, the cooling tower system 60 also includes a cooling water pump 602, which pumps cooling water into the cooling tower 601 at a certain pressure, thereby providing power for the circulation of cooling water in the cooling tower 601. The output end of the cooling water pump 602 is connected to the cooling water input end of the condenser 102.

[0084] like Figure 5 The schematic diagram of the ice storage air conditioning system shown in this application indicates that the ice storage air conditioning system 1 may also include an air conditioning terminal 70.

[0085] Optionally, the air conditioning terminal 70 includes a terminal heat exchanger 701, which is used to exchange heat between the flowing chilled water and the indoor air, thereby achieving a cooling function. The input end of the terminal heat exchanger 701 is connected to the chilled water output end of the evaporator 104, and the output end of the terminal heat exchanger 701 is connected to the input end of the chilled water pump 702.

[0086] Optionally, the air conditioning terminal 70 also includes a chilled water pump 702, which pumps chilled water into the terminal heat exchanger 701 at a certain pressure, thereby providing power for the circulation of chilled water in the terminal heat exchanger 701. The output end of the chilled water pump 702 is connected to the chilled water input end of the evaporator 104.

[0087] The ice storage air conditioning system 1 provided in this application includes a main unit cooling mode, an ice storage system cooling mode, an ice-making mode, a main unit combined with an ice storage system cooling mode, and a main unit cooling and ice-making mode. The refrigeration circuits in the ice storage air conditioning system 1 under different air conditioning cooling modes will be described below with reference to the accompanying drawings.

[0088] (I) Main Unit Cooling Mode

[0089] like Figure 6 As shown in Table 1, in the main unit cooling mode, the switching component 30 controls the refrigerant output terminal of the evaporator 104 to be connected to the first input terminal of the compressor 101, the second terminal of the ice storage tank 201 to be disconnected from the first input terminal of the compressor 101, and the second terminal of the ice storage tank 201 to be disconnected from the refrigerant output terminal of the evaporator 104.

[0090] After heat exchange in the cooling tower 601, the cooling water is pumped into the condenser 102 by the cooling water pump 602 to exchange heat with the refrigerant in the condenser 102. After heat exchange, the cooling water flows back to the cooling tower 601 to exchange heat with the atmosphere.

[0091] After heat exchange with the cooling water, part of the refrigerant enters the economizer 107 through the first input terminal of the economizer 107, and the other part passes through the third throttling device 108 and then through the second input terminal of the economizer 107. The two parts of refrigerant exchange heat at the economizer 107. The gaseous refrigerant after heat exchange enters the compressor 101 through the second input terminal of the compressor 101. The liquid refrigerant enters the compressor 101 from the first input terminal of the compressor 101 through the first throttling device 103, the refrigerant input terminal of the evaporator 104, the refrigerant output terminal of the evaporator 104, the third shut-off valve 303, and the second shut-off valve 302 from the output terminal of the economizer 107. The refrigerant then flows back to the condenser 102 through the output terminal of the compressor 101 and the refrigerant input terminal of the condenser 102.

[0092] Chilled water that has exchanged heat with the refrigerant in evaporator 104 flows into terminal heat exchanger 701 through the chilled water outlet of evaporator 104. Chilled water that has exchanged heat with indoor air in terminal heat exchanger 701 is then pumped into evaporator 104 from the chilled water inlet by chilled water pump 702. This achieves cooling of the space where air conditioning terminal 70 is located.

[0093] As can be seen from the above embodiments, in the host cooling mode, the ice storage system 20 does not work, the compressor 101 is connected in series with the evaporator 104, and the chilled water undergoes one heat exchange in the evaporator 104.

[0094] Table 1

[0095]

[0096] (II) Ice Storage System Cooling Mode

[0097] like Figure 7 As shown in Table 2, in the refrigeration mode of the ice storage system, the switching component 30 controls the second end of the ice storage tank 201 to be connected to the refrigerant output end of the evaporator 104, the second end of the ice storage tank 201 to be disconnected from the first input end of the compressor 101, and the refrigerant output end of the evaporator 104 to be disconnected from the first input end of the compressor 101.

[0098] The refrigerant is powered by the refrigerant pump 203 and flows from the first end of the ice storage tank 201 through the refrigerant pump 203, the refrigerant input end of the evaporator 104, the refrigerant output end of the evaporator 104, the third shut-off valve 303, and the first shut-off valve 301 before flowing back to the ice storage tank 201 from the second end of the ice storage tank 201.

[0099] After exchanging heat with the refrigerant in the evaporator 104, the chilled water flows into the terminal heat exchanger 701 through the chilled water outlet of the evaporator 104. After exchanging heat with the indoor air in the terminal heat exchanger 701, the chilled water is pumped into the evaporator 104 from the chilled water inlet by the chilled water pump 702. This delivers the cooling energy generated by melting ice in the ice storage tank 201 to the air conditioning terminal 70, thereby achieving cooling of the space where the air conditioning terminal 70 is located.

[0100] As can be seen from the above embodiments, in the ice storage system refrigeration mode, the evaporator 104 is connected in series with the ice storage system 20, the compressor does not work, and the power cost is saved and the grid load is balanced under high electricity prices.

[0101] Table 2

[0102]

[0103]

[0104] (III) Ice-making mode

[0105] like Figure 8 As shown in Table 3, in ice-making mode, the switching component 30 controls the second end of the ice storage tank 201 to be connected to the first input end of the compressor 101, the second end of the ice storage tank 201 to be disconnected from the refrigerant output end of the evaporator 104, and the refrigerant output end of the evaporator 104 to be disconnected from the first input end of the compressor 101.

[0106] After heat exchange in the cooling tower 601, the cooling water is pumped into the condenser 102 by the cooling water pump 602 to exchange heat with the refrigerant in the condenser 102. After heat exchange, the cooling water flows back to the cooling tower 601 to exchange heat with the atmosphere.

[0107] After heat exchange with the cooling water, part of the refrigerant enters the economizer 107 through the first input terminal of the economizer 107, and the other part passes through the third throttling device 108 and then through the second input terminal of the economizer 107. The two parts of refrigerant exchange heat at the economizer 107. The gaseous refrigerant after heat exchange enters the compressor 101 through the second input terminal of the compressor 101. The liquid refrigerant enters the compressor 101 from the second output terminal of the economizer 107, passing sequentially through the second throttling device 202, the first end of the ice storage tank 201, the second end of the ice storage tank 201, the first shut-off valve 301, and the second shut-off valve 302, and then enters the compressor 101 from the first input terminal of the compressor 101. The refrigerant flows back to the condenser 102 through the output terminal of the compressor 101 and the refrigerant input terminal of the condenser 102. Thus, the main unit makes ice in the ice storage tank.

[0108] As can be seen from the above embodiments, the evaporator 104 does not work in ice-making mode. The compressor 101 is connected in series with the ice storage system 20, and the refrigerant directly enters the ice storage tank 201. The refrigerant undergoes heat exchange in the ice storage tank 201, which increases the evaporation temperature of the main unit in ice-making mode, thereby improving the operating efficiency of the main unit.

[0109] Table 3

[0110]

[0111]

[0112] (iv) Cooling mode of main unit combined with ice storage system

[0113] like Figure 9 As shown in Table 4, in the refrigeration mode of the main unit combined with the ice storage system, the switching component 30 controls the second end of the ice storage tank 201 to be connected to the first input end of the compressor 101, the second end of the ice storage tank 201 to be connected to the refrigerant output end of the evaporator 104, and the refrigerant output end of the evaporator 104 to be connected to the first input end of the compressor 101.

[0114] After heat exchange in the cooling tower 601, the cooling water is pumped into the condenser 102 by the cooling water pump 602 to exchange heat with the refrigerant in the condenser 102. After heat exchange, the cooling water flows back to the cooling tower 601 to exchange heat with the atmosphere.

[0115] After heat exchange with the cooling water, part of the refrigerant enters the economizer 107 through the first input terminal of the economizer 107, and the other part enters the economizer 107 through the second input terminal of the economizer 107 after passing through the third throttling device 108. The two parts of refrigerant exchange heat at the economizer 107, and the gaseous refrigerant after heat exchange enters the compressor 101 through the second terminal of the compressor 101. Liquid refrigerant flows from the second output end of economizer 107 through the first throttling device 103, the refrigerant input end of evaporator 104, the refrigerant output end of evaporator 104, and the third shut-off valve 303. Part of the refrigerant flows into compressor 101 through the second shut-off valve, and then flows back to condenser 102 through the output end of compressor 101 and the refrigerant input end of condenser 102. Another part of the refrigerant flows from the first shut-off valve 301 to the second end of ice storage tank 201. After heat exchange in ice storage tank 201, it flows out from the first end of ice storage tank 201 and is pumped back to evaporator 104 by refrigerant pump 203.

[0116] After exchanging heat with the refrigerant in the evaporator 104, the chilled water flows into the terminal heat exchanger 701 through the chilled water outlet of the evaporator 104. After exchanging heat with the indoor air in the terminal heat exchanger 701, the chilled water is pumped into the evaporator 104 from the chilled water inlet by the chilled water pump 702. This achieves the cooling of the space where the air conditioning terminal 70 is located by the main unit combined with the ice storage system.

[0117] As can be seen from the above embodiments, in the cooling mode of the main unit combined with the ice storage system, the evaporator 104 is connected in series with the ice storage system 20, and the compressor 101 is connected in parallel with the ice storage system 20, so that the cooling demand can be met even when the ice storage system 20 is insufficient.

[0118] Table 4

[0119]

[0120]

[0121] (V) Main unit cooling and ice-making mode

[0122] like Figure 10 As shown in Table 5, in the main unit's refrigeration and ice-making mode, the switching component 30 controls the second end of the ice storage tank 201 to be connected to the first input end of the compressor 101, the second end of the ice storage tank 201 to be connected to the refrigerant output end of the evaporator 104, and the refrigerant output end of the evaporator 104 to be connected to the first input end of the compressor 101.

[0123] After heat exchange in the cooling tower 601, the cooling water is pumped into the condenser 102 by the cooling water pump 602 to exchange heat with the refrigerant in the condenser 102. After heat exchange, the cooling water flows back to the cooling tower 601 to exchange heat with the atmosphere.

[0124] After heat exchange with the cooling water, part of the refrigerant enters the economizer 107 through the first input terminal of the economizer 107, and the other part enters the economizer 107 through the second input terminal of the economizer 107 after passing through the third throttling device 108. The two parts of refrigerant exchange heat at the economizer 107, and the gaseous refrigerant after heat exchange enters the compressor 101 through the second input terminal of the compressor 101. The liquid refrigerant flows out from the second output terminal of the economizer 107. Part of the refrigerant passes through the first throttling device 103, the refrigerant input terminal of the evaporator 104, the refrigerant output terminal of the evaporator 104, and the third shut-off valve 303 in sequence, and then flows into the compressor 101 through the second shut-off valve 302. The other part of the refrigerant passes through the second throttling device 202 and the first end of the ice storage tank 201 and flows into the ice storage tank 201. After heat exchange in the ice storage tank 201, it flows from the second end of the ice storage tank 201 to the compressor 101. The refrigerant flows back to the condenser 102 through the output end of the compressor 101 and the refrigerant input end of the condenser 102.

[0125] After exchanging heat with the refrigerant in the evaporator 104, the chilled water flows into the terminal heat exchanger 701 through the chilled water outlet of the evaporator 104. After exchanging heat with the indoor air in the terminal heat exchanger 701, the chilled water is pumped into the evaporator 104 from the chilled water inlet by the chilled water pump 702.

[0126] As can be seen from the above embodiments, in the host cooling and ice-making mode, the evaporator 104 is connected in parallel with the ice storage system 20, and the compressor 101 is connected in series with the ice storage system 20, so as to meet the needs of ice storage and cooling under low-cost electricity.

[0127] In some embodiments, the refrigerant flow rate under the main unit's cooling mode is adjusted by regulating the opening of the first throttling device 103, and the refrigerant flow rate under the ice storage tank's ice-making mode is adjusted by regulating the opening of the second throttling device 202, thereby achieving the cooling capacity supply to the evaporator 104 and the ice storage tank 201. In the main unit's cooling and ice storage mode, since the main unit supplies the ice storage system with low-temperature refrigerant (e.g., -6 degrees Celsius), after heat exchange with the water in the ice storage tank 201, the refrigerant is still in a state below 0 degrees Celsius, which may cause the chilled water pipes at the air conditioning terminal to freeze. Therefore, the third shut-off valve 303 can also be used to regulate the evaporation pressure so that the refrigerant flowing to the air conditioning terminal is at a high temperature (e.g., -6 degrees Celsius), thereby preventing the air conditioning terminal from freezing.

[0128] Table 5

[0129]

[0130] In some embodiments, such as Figure 11 As shown, the ice storage air conditioning system 1 may further include a first temperature sensor 401 and a first pressure sensor 402 disposed at the second output terminal of the economizer 107. The first temperature sensor 401 is used to detect the temperature at the second output terminal of the economizer 107, and the first pressure sensor 402 is used to detect the pressure at the second output terminal of the economizer 107. The specific enthalpy value of the refrigerant at the second output terminal of the economizer 107 can be determined by the temperature and pressure at the second output terminal of the economizer 107.

[0131] In some embodiments, such as Figure 12 As shown, the ice storage air conditioning system 1 may further include a second temperature sensor 204 and a second pressure sensor 205 disposed at the second end of the ice storage tank 201. The second temperature sensor 204 is used to detect the temperature at the second end of the ice storage tank 201, and the second pressure sensor 205 is used to detect the pressure at the second end of the ice storage tank 201. The specific enthalpy of the refrigerant at the second end of the ice storage tank 201 can be determined by the temperature and pressure at the second end of the ice storage tank 201.

[0132] In some embodiments, such as Figure 13 As shown, the ice storage air conditioning system 1 may further include a third temperature sensor 105 and a third pressure sensor 106 disposed at the refrigerant output terminal of the evaporator 104. The third temperature sensor 105 is used to detect the temperature at the refrigerant output terminal of the evaporator 104, and the third pressure sensor 106 is used to detect the pressure at the refrigerant output terminal of the evaporator 104. The specific enthalpy of the refrigerant at the refrigerant output terminal of the evaporator 104 can be determined by the temperature and pressure at the refrigerant output terminal of the evaporator 104.

[0133] In some embodiments, in the main unit cooling and ice-making mode, the refrigerant flow rate for main unit cooling can be determined by the following formula:

[0134]

[0135] Where q2 is the refrigerant flow rate of the main unit, Q2 is the cooling demand of the air conditioner, h1 is the specific enthalpy of the refrigerant at the second output terminal of the economizer 107 (unit: kJ / kg*K), and h2 is the specific enthalpy of the refrigerant at the refrigerant output terminal of the evaporator 104.

[0136] The refrigerant flow rate of the main ice machine can be determined by the following formula:

[0137]

[0138] Where q3 is the refrigerant flow rate of the main unit, Q3 is the cooling capacity requirement of the ice storage system, h1 is the specific enthalpy of the refrigerant at the second output end of the economizer 107 (unit: kJ / kg*K), and h3 is the specific enthalpy of the refrigerant at the second end of the ice storage tank 201.

[0139] In some embodiments, the ice storage air conditioning system 1 may further include a controller 80, such as Figure 14 As shown, compressor 101, cooling water pump 602, chilled water pump 702, refrigerant pump 203, first throttling device 103, second throttling device 202, third throttling device 108, and switching component 30 are electrically connected to controller 80.

[0140] In some embodiments, the controller 80 is configured to respond to an instruction to operate a cooling mode, determine the target electricity price corresponding to the current time based on the correspondence between time and electricity price; acquire the first cooling capacity of the host, the second cooling capacity of the ice storage system, and the cooling demand of the air conditioning terminal; and determine the target operating mode based on the target electricity price, the first cooling capacity, the second cooling capacity, and the cooling demand.

[0141] The target operating mode is one of the following: host cooling mode, ice storage system cooling mode, ice making mode, host combined with ice storage system cooling mode, or host cooling and ice making mode.

[0142] Optionally, the memory of the ice storage air conditioning system 1 stores the correspondence between time and electricity price. For example, the electricity price is m in the time period [a, b], n in the time period [c, d], and p in the time period [e, f]. [a, b], [c, d], and [e, f] are different time periods within a 24-hour period. The target electricity price is one of m, n, and p.

[0143] As one possible approach, the initial cooling capacity of the host unit can be determined by consulting the design documents of the cooling tower. When designing and manufacturing a cooling tower, the cooling capacity is usually clearly indicated in the design documents.

[0144] As another possible implementation, the initial cooling capacity of the main unit can be determined by measuring the water flow rate of the cooling tower, the temperature at the input end of the cooling tower, and the temperature at the output end of the cooling tower. For example, the calculation formula is: Cooling capacity (kW) = Water flow rate (L / min) × (Temperature at the input end of the cooling tower - Temperature at the output end of the cooling tower) × 4.2, where 4.2 is the specific heat capacity of water.

[0145] As one possible implementation, the second cooling capacity of the ice storage system can be determined by consulting the design documents of the ice storage tank. When designing and manufacturing ice storage tanks, the cooling capacity of the ice storage tank is usually clearly indicated in the design documents.

[0146] As another possible implementation, the ice storage tank 201 is equipped with a liquid level sensor to detect the amount of ice stored in the tank. The amount of ice stored in the tank is obtained through the liquid level sensor, and the second cooling capacity is determined based on the amount of ice stored and the ice storage efficiency of the ice storage tank. It is understood that the more ice stored in the ice storage tank, the greater its cooling capacity, and vice versa.

[0147] For example, when the ice storage tank is empty, the second cooling capacity is below the lower limit of the cooling capacity; when the ice storage tank is full, the second cooling capacity is above the upper limit of the cooling capacity.

[0148] As one possible implementation, the cooling demand at the air conditioning terminal can be determined using a preset load forecasting model stored in the memory of the ice storage air conditioning system 1. The preset load forecasting model is determined by the following steps:

[0149] Step 1: Obtain the air conditioning cooling load, supply air temperature, return air temperature, indoor temperature, and relative humidity values ​​from historical data.

[0150] Step Two: Using the supply air temperature, return air temperature, indoor temperature, and relative humidity values ​​from historical data as historical sample data, and using the air conditioning cooling load corresponding to the supply air temperature, return air temperature, indoor temperature, and relative humidity values ​​as sample labels, establish a historical dataset and a training dataset. The historical data in the historical dataset can be data from within one month or within one week, and the historical data in the training dataset can be historical data from the previous day or the current day; this embodiment of the application does not impose such limitations.

[0151] Step 3: Establish the original load forecasting model based on the correspondence between historical sample data and the corresponding sample labels.

[0152] Step 4: Input the historical sample data from the training dataset into the original load prediction model to obtain the predicted values ​​of the air conditioning cooling load corresponding to the supply air temperature, return air temperature, indoor temperature and relative humidity values ​​in the training sample set.

[0153] Step 5: Determine the loss value based on the predicted value of the air conditioning cooling load and the actual value of the air conditioning cooling load in the training sample set.

[0154] Step 6: Determine whether the original load forecasting model has converged based on the loss value.

[0155] Step 7: If not, update the weight parameters in the original load forecasting model based on the loss value, and continue to Step 4.

[0156] Step 8: If so, use the current load forecasting model as the preset load forecasting model.

[0157] It is understandable that the first cooling capacity, the second cooling capacity, and the cooling demand at the air conditioning terminal are constantly changing. The ice storage air conditioning system can select different cooling modes to meet the cooling demand of the air conditioning terminal. Furthermore, the power consumption of the main unit cooling and the ice storage system cooling differs; when the ice storage system is cooling, the compressor does not work, and the power consumption of the ice storage system is less than that of the main unit cooling. The embodiments of this application determine the target operating mode based on the first cooling capacity, the second cooling capacity, the cooling demand, and the target electricity price, which can reduce the electricity cost of the ice storage air conditioning system while meeting the cooling demand.

[0158] If the target electricity price is below the first preset price, it indicates that the target price is a low price. In this case, the main unit cooling mode should be used first. Since the ice storage system requires the main unit to produce ice first, and then the ice storage system to cool it, there is a certain energy loss. Using the main unit cooling mode directly can reduce energy loss and save electricity costs.

[0159] As one possible implementation, when the target electricity price is below the first preset electricity price, such as Figure 15As shown, the controller 80 is specifically used to determine the target operating mode as the main unit cooling mode when the first cooling capacity exceeds the cooling demand and the second cooling capacity exceeds the upper limit of the cooling capacity (the ice storage tank is full). When the first cooling capacity exceeds the cooling demand and the second cooling capacity exceeds the upper limit of the cooling capacity, it means that the cooling capacity of the main unit can meet the cooling demand, and the ice storage tank is full of ice. At this time, there is no need to make ice in the ice storage tank, and directly executing the main unit cooling mode can reduce the energy consumption of melting ice after storage, thus saving electricity costs.

[0160] When the first cooling capacity exceeds the cooling demand and the second cooling capacity falls below the upper limit (ice tank not full), the target operating mode is determined to be the main unit's cooling and ice-making mode. When the first cooling capacity exceeds the cooling demand and the second cooling capacity falls between the upper and lower limits, it indicates that the main unit's cooling capacity can meet the cooling demand, but the ice tank is not full. In this case, ice production is required. Therefore, determining the target operating mode as the main unit's cooling and ice-making mode allows for meeting the cooling demand while simultaneously producing ice during periods of low electricity prices for use during periods of high electricity prices.

[0161] If the first cooling capacity is below the cooling demand and the second cooling capacity is above the lower limit of the cooling capacity, the target operating mode is determined to be the main unit combined with the ice storage system cooling mode. If the first cooling capacity is below the cooling demand and the second cooling capacity is above the lower limit of the cooling capacity, it indicates that the main unit's cooling capacity cannot meet the cooling demand, and the ice storage tank is not empty. In this case, using both the main unit and the ice storage system simultaneously can meet the user's cooling demand as much as possible.

[0162] If the first cooling capacity is below the cooling demand and the second cooling capacity is below the lower limit of the cooling capacity, the target operating mode is determined to be the main unit cooling mode. If the first cooling capacity is below the cooling demand and the second cooling capacity is below the lower limit of the cooling capacity, it means that the main unit's cooling capacity cannot meet the cooling demand, and the ice storage tank is empty. In this case, the ice storage system cannot perform cooling, and only the main unit can perform cooling first.

[0163] If the target electricity price is higher than the second preset electricity price, it indicates that the target electricity price is a high price. In this case, the ice storage system cooling mode is used first. If the ice storage system cannot meet the cooling demand, the main unit will assist in cooling, thereby saving electricity costs.

[0164] As another possible implementation, if the target electricity price is above the second preset electricity price, such as Figure 16 As shown, the controller 80 is specifically used to determine the target operating mode as the main unit cooling mode when the second cooling capacity is below the lower limit of the cooling capacity. When the second cooling capacity is below the lower limit of the cooling capacity, it indicates that the ice storage tank is empty, and at this time, only the main unit can provide cooling to meet the cooling demand.

[0165] If the second cooling capacity exceeds the cooling demand, the target operating mode is determined to be the ice storage system cooling mode. This indicates that the ice storage system's cooling capacity can meet the cooling demand, eliminating the need for a dedicated cooling unit.

[0166] If the second cooling capacity is above the lower limit of the cooling capacity and below the cooling demand, the target operating mode is determined to be the main unit combined with the ice storage system cooling mode. If the second cooling capacity is above the lower limit of the cooling capacity and below the cooling demand, it indicates that the ice storage tank is not empty, but the cooling capacity in the ice storage tank cannot meet the cooling demand. Therefore, the main unit is needed to assist in cooling to meet the cooling demand.

[0167] If the target electricity price is between the first preset electricity price and the second preset electricity price, it means that the target electricity price is the flat electricity price, or the electricity price is between the low electricity price and the high electricity price. In this case, the cooling mode of the main unit combined with the ice storage system should be given priority, which can save electricity costs while meeting the cooling demand.

[0168] As another possible implementation, if the target electricity price is between the first and second preset electricity prices, such as Figure 17 As shown, the controller 80 is specifically used to determine the target operating mode as main unit cooling mode when the second cooling capacity is below the lower limit of the cooling capacity; to determine the target operating mode as main unit cooling mode when the second cooling capacity is above the lower limit of the cooling capacity and the first cooling capacity is above the cooling demand; and to determine the target operating mode as main unit combined with ice storage system cooling mode when the second cooling capacity is above the lower limit of the cooling capacity and the first cooling capacity is below the cooling demand.

[0169] If the first cooling capacity is below the cooling demand and the second cooling capacity is above the lower limit of the cooling capacity, it means that the cooling capacity of the main unit cannot meet the cooling demand and the ice storage tank is not empty. At this time, using the main unit and the ice storage system for cooling at the same time can maximize the use of the ice storage system and reduce electricity costs.

[0170] In some embodiments, the controller 80 is further configured to obtain a target electricity price in a non-cooling mode; and, if the target electricity price is below a first preset electricity price, to control the ice storage air conditioning system to ice-making mode until the second cooling capacity is above the upper limit of the cooling capacity.

[0171] In non-cooling mode, there is no need to consider whether the cooling capacity meets the cooling demand. Ice can be made when the electricity price is low so that the ice storage system can be used for cooling when the electricity price is high, thereby reducing electricity costs.

[0172] Controller 80 refers to a device that can generate operation control signals based on instruction opcodes and timing signals to instruct the ice storage air conditioning system 1 to execute control commands. Exemplarily, controller 80 can be a central processing unit (CPU), a network processor (NP), a digital signal processor (DSP), a microprocessor, a microcontroller, a programmable logic device (PLD), or any combination thereof. The controller can also be other devices with processing functions, such as circuits, devices, or software modules; this application embodiment does not impose any limitations on this.

[0173] In some embodiments, the controller 80 can be a microcontroller unit (MCU). An MCU, also known as a single-chip microcomputer, is a chip-level computer that integrates a central processing unit (CPU) with appropriately reduced frequency and specifications, along with peripheral interfaces such as memory, timer, USB, A / D converter, UART, PLC, DMA, and even LCD driver circuitry, all onto a single chip. This allows for different combinations of control for various applications.

[0174] In addition, the controller can be used to control the operation of each component in the ice storage air conditioning system 1, so that each component of the ice storage air conditioning system 1 can operate to achieve each predetermined function of the ice storage air conditioning system 1.

[0175] It is understood that the structures illustrated in the embodiments of the present invention do not constitute a specific limitation on the ice storage air conditioning system. In other embodiments of this application, the ice storage air conditioning system may include more or fewer components than illustrated, or combine some components, or split some components, or have different component arrangements. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

[0176] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0177] like Figure 18 As shown in the figure, this application provides a control method for an ice storage air conditioning system, applied to the controller of the ice storage air conditioning system. The method includes the following steps:

[0178] S1. In response to the command to operate the cooling mode, determine the target electricity price corresponding to the current time based on the correspondence between time and electricity price.

[0179] S2. Obtain the first cooling capacity of the main unit, the second cooling capacity of the ice storage system, and the cooling demand of the air conditioning terminal.

[0180] S3. Determine the target operating mode based on the target electricity price, the first cooling capacity, the second cooling capacity, and the cooling demand.

[0181] The target operating mode is any of the following: main unit cooling mode, ice storage system cooling mode, ice making mode, main unit combined with ice storage system cooling mode, and main unit cooling and ice making mode.

[0182] Figure 18 The illustrated embodiments offer at least the following advantages: Since the first cooling capacity, the second cooling capacity, and the cooling demand of the air conditioning terminals are constantly changing, the ice storage air conditioning system can select different cooling modes to meet the cooling needs of the air conditioning terminals. Furthermore, the power consumption of the main unit's cooling and the ice storage system's cooling differs; when the ice storage system is cooling, the compressor does not operate, and the power consumption of the ice storage system is less than that of the main unit's cooling. The embodiments of this application determine the target operating mode based on the first cooling capacity, the second cooling capacity, the cooling demand, and the target electricity price, which can reduce the electricity cost of the ice storage air conditioning system while meeting the cooling demand.

[0183] In some embodiments, when the target electricity price is below the first preset electricity price, step S3 can be implemented as follows: when the first cooling capacity is above the cooling demand and the second cooling capacity is above the upper limit of the cooling capacity, the target operating mode is determined to be the main unit cooling mode; when the first cooling capacity is above the cooling demand and the second cooling capacity is below the upper limit of the cooling capacity, the target operating mode is determined to be the main unit cooling and ice-making mode; when the first cooling capacity is below the cooling demand and the second cooling capacity is above the lower limit of the cooling capacity, the target operating mode is determined to be the main unit combined with the ice storage system cooling mode; when the first cooling capacity is below the cooling demand and the second cooling capacity is below the lower limit of the cooling capacity, the target operating mode is determined to be the main unit cooling mode.

[0184] As can be seen from the above embodiments, when the target electricity price is below the first preset electricity price, it indicates that the target electricity price is a low electricity price. In this case, the main unit cooling mode is used first. Since the ice storage system requires the main unit to produce ice first, and then the ice storage system to cool it, there is a certain energy loss. Directly using the main unit cooling mode can reduce energy loss and save electricity costs.

[0185] In some embodiments, when the target electricity price is above the second preset electricity price, step S3 can be implemented as follows: when the second cooling capacity is below the lower limit of the cooling capacity, the target operating mode is determined to be the main unit cooling mode; when the second cooling capacity is above the cooling demand, the target operating mode is determined to be the ice storage system cooling mode; when the second cooling capacity is above the lower limit of the cooling capacity and below the cooling demand, the target operating mode is determined to be the main unit combined with the ice storage system cooling mode. Wherein, the second preset electricity price is above the first preset electricity price.

[0186] As can be seen from the above embodiments, when the target electricity price is above the second preset electricity price, it indicates that the target electricity price is a high price. In this case, the ice storage system cooling mode is used first. If the ice storage system cannot meet the cooling demand, the main unit will assist in cooling, thereby saving electricity costs.

[0187] In some embodiments, when the target electricity price is between the first preset electricity price and the second preset electricity price, the above step S3 can be implemented as the following steps: when the second cooling capacity is below the lower limit of the cooling capacity, the target operating mode is determined to be the main unit cooling mode; when the second cooling capacity is above the lower limit of the cooling capacity and the first cooling capacity is above the cooling demand, the target operating mode is determined to be the main unit cooling mode; when the second cooling capacity is above the lower limit of the cooling capacity and the first cooling capacity is below the cooling demand, the target operating mode is determined to be the main unit combined with ice storage system cooling mode.

[0188] As can be seen from the above embodiments, when the target electricity price is between the first preset electricity price and the second preset electricity price, it means that the target electricity price is the flat electricity price, or the electricity price is between the low electricity price and the high electricity price. In this case, the combined cooling mode of the host and the ice storage system is given priority, which can save electricity costs while meeting the cooling demand.

[0189] In some embodiments, the control method of the ice storage air conditioning system provided in this application may further include the following steps: in non-cooling mode, obtaining the target electricity price; when the target electricity price is below the first preset electricity price, controlling the ice storage air conditioning system to ice-making mode until the second cooling capacity is above the upper limit of the cooling capacity.

[0190] As can be seen from the above embodiments, in non-cooling mode, there is no need to consider whether the cooling capacity meets the cooling demand. Ice can be made under low electricity prices so that the ice storage system can be used for cooling under high electricity prices, thereby reducing electricity costs.

[0191] As can be seen, the above mainly describes the solutions provided by the embodiments of this application from a methodological perspective. To achieve the above functions, the embodiments of this application provide corresponding hardware structures and / or software modules for executing each function. Those skilled in the art should readily recognize that, in conjunction with the modules and algorithm steps of the various examples described in the embodiments disclosed herein, the embodiments of this application can be implemented in hardware or a combination of hardware and computer software. Whether a function is executed in a hardware or computer software-driven hardware manner depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this invention.

[0192] This application embodiment can divide the controller into functional modules according to the above method example. For example, each function can be divided into a separate functional module, or two or more functions can be integrated into one processing module. The integrated module can be implemented in hardware or as a software functional module. Optionally, the module division in this application embodiment is illustrative and only represents one logical functional division; other division methods may be used in actual implementation.

[0193] This application also provides a computer-readable storage medium including computer-executable instructions, which, when run on a computer, cause the computer to execute any of the control methods for an ice storage air conditioning system provided in the above embodiments.

[0194] This application also provides a computer program product containing computer execution instructions, which, when run on a computer, causes the computer to execute any of the control methods for an ice storage air conditioning system provided in the above embodiments.

[0195] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented using software programs, implementation can be, in whole or in part, in the form of a computer program product. This computer program product includes one or more computer-executable instructions. When these computer-executable instructions are loaded and executed on a computer, all or part of the flow or function according to the embodiments of this application is generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer-executable instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, computer-executable instructions can be transmitted from one website, computer, server, or data center to another via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium accessible to a computer or a data storage device containing one or more servers, data centers, etc., that can be integrated with the medium. The available media can be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., DVDs), or semiconductor media (e.g., solid-state disks, SSDs).

[0196] Although this application has been described herein in conjunction with various embodiments, those skilled in the art, by reviewing the accompanying drawings, disclosure, and appended claims, will understand and implement other variations of the disclosed embodiments in carrying out the claimed application. In the claims, the word "comprising" does not exclude other components or steps, and "a" or "an" does not exclude multiple instances. A single processor or other unit can implement several functions listed in the claims. While different dependent claims may recite certain measures, this does not mean that these measures cannot be combined to produce good results.

[0197] Although this application has been described in conjunction with specific features and embodiments, it is obvious that various modifications and combinations can be made thereto without departing from the spirit and scope of this application. Accordingly, this specification and drawings are merely illustrative descriptions of the application as defined by the appended claims, and are considered to cover any and all modifications, variations, combinations, or equivalents within the scope of this application. Clearly, those skilled in the art can make various alterations and modifications to this application without departing from the spirit and scope of this application. Thus, if such modifications and modifications of this application fall within the scope of the claims of this application and their equivalents, this application is also intended to include such modifications and modifications.

[0198] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions 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. An ice storage air conditioning system, characterized in that, include: The main unit includes a refrigeration circuit consisting of a compressor, a condenser, a first throttling device, and an evaporator. An ice storage system, comprising: an ice storage tank, a second throttling device, and a refrigerant pump; wherein, the first end of the ice storage tank, the first end of the refrigerant pump, and the first end of the second throttling device are connected together; the second end of the refrigerant pump, the refrigerant input end of the evaporator, and the output end of the first throttling device are connected together; and the second end of the second throttling device is connected to the input end of the first throttling device. A switching component is provided to control at least one of the following: the second end of the ice storage tank is connected to the first input end of the compressor; the second end of the ice storage tank is connected to the refrigerant output end of the evaporator; and the refrigerant output end of the evaporator is connected to the first input end of the compressor, so that the ice storage air conditioning system is in any of the following operating modes: main unit cooling mode, ice storage system cooling mode, ice making mode, main unit combined with ice storage system cooling mode, and main unit cooling and ice making mode.

2. The ice storage air conditioning system according to claim 1, characterized in that, In the host cooling mode, the switching component controls the refrigerant output terminal of the evaporator to be connected to the first input terminal of the compressor, the first throttling device is turned on, the second throttling device is turned off, and the refrigerant pump is turned off. In the ice storage system's refrigeration mode, the switching component controls the second end of the ice storage tank to be connected to the refrigerant output end of the evaporator, the first throttling device and the second throttling device are closed, and the refrigerant pump is in the on state; In the ice-making mode, the switching component controls the second end of the ice storage tank to be connected to the first input end of the compressor, the first throttling device is closed, the second throttling device is open, and the refrigerant pump is in the off state; In the refrigeration mode of the main unit combined with the ice storage system, the switching component controls the second end of the ice storage tank to be connected to the first input end of the compressor and the second end of the ice storage tank to be connected to the refrigerant output end of the evaporator. The first throttling device is turned on, the second throttling device is turned off, and the refrigerant pump is in the on state. In the main unit's refrigeration and ice-making mode, the switching component controls the second end of the ice storage tank to be connected to the first input end of the compressor, and the second end of the ice storage tank to be connected to the refrigerant output end of the evaporator. The first throttling device and the second throttling device are turned on, and the refrigerant pump is turned off.

3. The ice storage air conditioning system according to claim 2, characterized in that, The switching assembly includes a first shut-off valve, a second shut-off valve, and a third shut-off valve. The first end of the first shut-off valve is connected to the second end of the ice storage tank. The second end of the first shut-off valve is connected to the first end of the second shut-off valve and the first end of the third shut-off valve. The second end of the second shut-off valve is connected to the first input end of the compressor. The second end of the third shut-off valve is connected to the refrigerant output end of the evaporator. When the first and second shut-off valves are open and the third shut-off valve is closed, the second end of the ice storage tank is connected to the first input end of the compressor, the second end of the ice storage tank is not connected to the refrigerant output end of the evaporator, and the refrigerant output end of the evaporator is not connected to the first input end of the compressor. When the first and third shut-off valves are open and the second shut-off valve is closed, the second end of the ice storage tank is connected to the refrigerant output end of the evaporator, the second end of the ice storage tank is not connected to the first input end of the compressor, and the refrigerant output end of the evaporator is not connected to the first input end of the compressor. When the first shut-off valve, the second shut-off valve, and the third shut-off valve are all open, the second end of the ice storage tank is connected to the first input end of the compressor, the second end of the ice storage tank is connected to the refrigerant output end of the evaporator, and the refrigerant output end of the evaporator is connected to the first input end of the compressor. When the first shut-off valve is closed and the second shut-off valve and the third shut-off valve are open, the refrigerant output terminal of the evaporator is connected to the first input terminal of the compressor, the second terminal of the ice storage tank is not connected to the first input terminal of the compressor, and the second terminal of the ice storage tank is not connected to the refrigerant output terminal of the evaporator.

4. The ice storage air conditioning system according to claim 2, characterized in that, The main unit also includes an economizer and a third throttling device; the first input terminal of the economizer is connected to the refrigerant output terminal of the condenser, the first output terminal of the economizer is connected to the second input terminal of the compressor, the second input terminal of the economizer is connected to the output terminal of the third throttling device, and the second output terminal of the economizer is connected to the input terminal of the first throttling device; the input terminal of the third throttling device is connected to the refrigerant output terminal of the condenser.

5. The ice storage air conditioning system according to claim 4, characterized in that, The third throttling device is activated in the main unit cooling mode, the ice-making mode, the main unit combined with ice storage system cooling mode, and the main unit cooling and ice-making mode. In the ice storage system's cooling mode, the third throttling device is turned off.

6. The ice storage air conditioning system according to claim 1, characterized in that, The ice storage air conditioning system also includes a cooling tower system, which includes a cooling tower and a cooling water pump. The input end of the cooling water tower is connected to the cooling water output end of the condenser, and the output end of the cooling water tower is connected to the input end of the cooling water pump. The output end of the cooling water pump is connected to the cooling water input end of the condenser.

7. The ice storage air conditioning system according to claim 1, characterized in that, The ice storage air conditioning system also includes air conditioning terminals, which include terminal heat exchangers and chilled water pumps. The input end of the terminal heat exchanger is connected to the chilled water output end of the evaporator, and the output end of the terminal heat exchanger is connected to the input end of the chilled water pump. The output end of the chilled water pump is connected to the chilled water input end of the evaporator.

8. The ice storage air conditioning system according to claim 2, characterized in that, Also includes: The controller is configured to: In response to the command to operate in cooling mode, the target electricity price corresponding to the current time is determined based on the correspondence between time and electricity price; The first cooling capacity of the host, the second cooling capacity of the ice storage system, and the cooling demand of the air conditioning terminal are obtained. Based on the target electricity price, the first cooling capacity, the second cooling capacity, and the cooling demand, a target operating mode is determined. The target operating mode is any of the following: the main unit cooling mode, the ice storage system cooling mode, the ice making mode, the main unit combined with the ice storage system cooling mode, and the main unit cooling and ice making mode.

9. The ice storage air conditioning system according to claim 8, characterized in that, The controller is specifically configured as follows: In response to the target electricity price being below the first preset electricity price, and the first cooling capacity being above the cooling demand and the second cooling capacity being above the upper limit of the cooling capacity, the target operating mode is determined to be the main unit cooling mode. When the first cooling capacity is above the cooling demand and the second cooling capacity is below the upper limit of the cooling capacity, the target operating mode is determined to be the main unit cooling and ice making mode. When the first cooling capacity is below the cooling demand and the second cooling capacity is above the lower limit of the cooling capacity, the target operating mode is determined to be the host combined with ice storage system cooling mode. When the first cooling capacity is below the cooling demand and the second cooling capacity is below the lower limit of the cooling capacity, the target operating mode is determined to be the main unit cooling mode. In response to the target electricity price being above the second preset electricity price, and the second cooling capacity being below the cooling capacity lower limit, the target operating mode is determined to be the main unit cooling mode; When the second cooling capacity exceeds the cooling demand, the target operating mode is determined to be the ice storage system cooling mode; When the second cooling capacity is above the lower limit of the cooling capacity and below the cooling demand, the target operating mode is determined to be the main unit combined with the ice storage system cooling mode. The second preset electricity price is higher than the first preset electricity price; In response to the target electricity price being between the first preset electricity price and the second preset electricity price, and when the second cooling capacity is below the lower limit of the cooling capacity, the target operating mode is determined to be the main unit cooling mode; When the second cooling capacity is above the lower limit of the cooling capacity and the first cooling capacity is above the cooling demand, the target operating mode is determined to be the main unit cooling mode. When the second cooling capacity is above the lower limit of the cooling capacity and the first cooling capacity is below the cooling demand, the target operating mode is determined to be the host combined with ice storage system cooling mode.

10. A control method for an ice storage air conditioning system, characterized in that, The method includes: In response to the command to operate in cooling mode, the target electricity price corresponding to the current time is determined based on the correspondence between time and electricity price; Obtain the first cooling capacity of the main unit, the second cooling capacity of the ice storage system, and the cooling demand of the air conditioning terminals; Based on the target electricity price, the first cooling capacity, the second cooling capacity, and the cooling demand, a target operating mode is determined. The target operating mode is any of the following: main unit cooling mode, ice storage system cooling mode, ice making mode, main unit combined with ice storage system cooling mode, and main unit cooling and ice making mode.

Images