Air conditioning unit and control method thereof

Abstract

The present invention discloses an air conditioning unit and a control method thereof, wherein the air conditioning unit includes: a chiller; a combined heat exchanger connected to the chiller, including a first heat exchanger and a second heat exchanger; and an energy storage device connected to the chiller and the combined heat exchanger, including a first energy storage device and a second energy storage device. The first energy storage device is used to store cold energy from the chiller, and the second energy storage device is used to store heat from the chiller. The energy storage device is used to provide cooling to the first heat exchanger and / or heating to the second heat exchanger. The present invention solves the problems of low energy efficiency and poor adjustability of a single energy storage device in air conditioning systems in the prior art, thereby improving system stability, adjustability, and economy.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to an air conditioning unit and a control method thereof. Background Art

[0002] At present, the energy consumption of building operation in my country accounts for about 25% of the country's total energy consumption. Among them, the total area of ​​large public buildings is less than 5% of the area of ​​urban civil buildings in my country, but their electricity consumption accounts for 25% of the total electricity consumption of buildings. Therefore, high-efficiency and energy-saving of air-conditioning systems has become an inevitable development trend.

[0003] Conventional single-return air conditioning systems use water-cooled dehumidification followed by electric heating or heat plates to control the outlet air temperature for optimal comfort. While cooling dehumidification systems are widely adopted due to their mature technology and low cost, they can also suffer from issues such as heat and cold offsetting, leading to increased energy consumption. Dew-point air delivery, for example, can also lead to lower air temperatures, which can easily cause a damp, cold sensation in the human body during transitional seasons. Furthermore, conventional energy storage systems utilize a single energy storage system (either cold or heat), resulting in low system efficiency and poor adjustability.

[0004] Currently, no effective solution has been proposed to the problem of low energy efficiency and poor adjustability of a single energy storage device in an air-conditioning system in related technologies. Summary of the Invention

[0005] The present invention provides an air-conditioning unit and a control method thereof, so as to at least solve the problem of low energy efficiency and poor adjustability of a single energy storage device in an air-conditioning system in the prior art.

[0006] To solve the above technical problems, according to one aspect of an embodiment of the present invention, an air conditioning unit is provided, comprising:

[0007] Chillers;

[0008] A combined heat exchanger, connected to the chiller, comprises a first heat exchanger and a second heat exchanger;

[0009] The energy storage device is connected to the chiller and the combined heat exchanger, and includes a first energy storage device and a second energy storage device. The first energy storage device is used to store cold through the chiller, and the second energy storage device is used to store heat through the chiller. The energy storage device is used to provide cooling to the first heat exchanger and / or provide heating to the second heat exchanger.

[0010] Furthermore, the chiller is a dual-head chiller, including: a first water outlet, a first water inlet, a second water outlet and a second water inlet; one end of the first heat exchanger is connected to the first water outlet, and the other end is connected to the first water inlet; one end of the second heat exchanger is connected to the second water outlet, and the other end is connected to the second water inlet.

[0011] Furthermore, the first energy accumulator includes: a third water inlet, a third water outlet, a fourth water inlet and a fourth water outlet; the second energy accumulator includes: a fifth water inlet, a fifth water outlet, a sixth water inlet and a sixth water outlet; wherein the fourth water outlet and the sixth water outlet are connected through a pipeline.

[0012] Furthermore, it also includes:

[0013] a first control valve located on the pipeline between the first water outlet and the water inlet of the first heat exchanger; wherein a first connection point is provided on the pipeline between the first control valve and the first water outlet, and a second connection point is provided on the pipeline between the first control valve and the water inlet of the first heat exchanger, the first connection point being connected to the third water inlet via a pipeline, and the second connection point being connected to the third water inlet via a pipeline;

[0014] a second control valve located on the pipeline between the first connection point and the third water inlet, and on the pipeline between the second connection point and the third water inlet;

[0015] a third control valve located on the pipeline between a third connection point and a fourth connection point; wherein the third connection point is located on the pipeline between the second connection point and the water inlet of the first heat exchanger, and the fourth connection point is located on the pipeline between the water outlet of the first heat exchanger and the first water inlet;

[0016] The fourth control valve is located on the pipeline between the third connection point and the first heat exchanger, and on the pipeline between the fourth connection point and the first heat exchanger.

[0017] Furthermore, a fifth connection point is provided on the pipeline between the second control valve and the third water outlet, and the fifth connection point is connected to the water outlet of the second heat exchanger through a pipeline; the air conditioning unit further includes:

[0018] a fifth control valve located on the pipeline between the fifth connection point and the water outlet of the second heat exchanger;

[0019] The sixth control valve is located on the pipeline between the fifth water inlet and the second water outlet, and on the pipeline between the fifth water outlet and the second water inlet.

[0020] Furthermore, it also includes:

[0021] a cooling tower connected to the second water outlet and the second water inlet;

[0022] a seventh control valve, located on the pipeline between the second water outlet and the cooling tower, and on the pipeline between the second water inlet and the cooling tower;

[0023] The condenser cleaning device is connected to the second water outlet and the second water inlet.

[0024] Furthermore, a sixth connection point is provided on the pipeline between the sixth control valve and the fifth water outlet, and the fourth water inlet is further connected to the sixth connection point via a pipeline; the air conditioning unit further comprises:

[0025] an eighth control valve located on the pipeline between the sixth connection point and the fourth water inlet; wherein a seventh connection point is also provided on the pipeline between the eighth control valve and the fourth water inlet, and an eighth connection point is also provided on the pipeline between the fifth control valve and the water outlet of the second heat exchanger;

[0026] a ninth control valve located on the pipeline between the seventh connection point and the eighth connection point;

[0027] a tenth control valve, located on the pipeline between the fifth water outlet and the sixth control valve;

[0028] an eleventh control valve, located on the pipeline between the fifth water inlet and the sixth control valve;

[0029] The twelfth control valve is located on the pipeline between the fourth water outlet and the sixth water outlet.

[0030] Furthermore, a ninth connection point is provided between the second control valve and the fifth connection point; the fifth water inlet and the ninth connection point are further connected via a pipeline; and the air conditioning unit further comprises:

[0031] a thirteenth control valve located on the pipeline between the fifth water inlet and the ninth connection point;

[0032] The fourteenth control valve is located on the pipeline between the ninth connecting point and the fifth connecting point.

[0033] Furthermore, the sixth water inlet is connected to the water inlet of the second heat exchanger via a pipeline, a tenth connection point is further provided on the pipeline between the sixth water inlet and the water inlet of the second heat exchanger, and the fifth water outlet is further connected to the tenth connection point; the air conditioning unit further comprises:

[0034] a fifteenth control valve located on the pipeline between the sixth water inlet and the tenth connection point;

[0035] a sixteenth control valve located on the pipeline between the eighth control valve and the sixth connection point; an eleventh connection point is also provided on the pipeline between the eighth control valve and the sixteenth control valve, and the eleventh connection point is connected to the water inlet of the first heat exchanger through a pipeline;

[0036] a seventeenth control valve located on the pipeline between the eleventh connection point and the water inlet of the first heat exchanger;

[0037] an eighteenth control valve, located on the pipeline between the third water outlet and the fifth connection point;

[0038] A nineteenth control valve is located on the pipeline between the fourth water outlet and the twelfth connection point; wherein the twelfth connection point is located on the pipeline between the fourth control valve and the fourth connection point;

[0039] a twentieth control valve located on the pipeline between the water inlet of the second heat exchanger and the thirteenth connection point; wherein the thirteenth connection point is located on the pipeline between the water inlet of the second heat exchanger and the tenth connection point;

[0040] The twenty-first control valve is located on the pipeline between the fifth water outlet and the tenth connection point.

[0041] Furthermore, it also includes:

[0042] a first water pump, located on the pipeline between the first water inlet and the fourth connection point;

[0043] a second water pump located on the pipeline between the sixth control valve and the sixth connection point;

[0044] The third water pump is located on the pipeline between the water outlet of the second heat exchanger and the eighth connection point.

[0045] According to another aspect of an embodiment of the present invention, a method for controlling an air conditioning unit is provided, which is applied to the air conditioning unit as described above, and the method includes:

[0046] Detecting the operating mode of the air-conditioning unit; wherein the operating modes include at least: cold storage mode, cooling mode, simultaneous cold and heat storage mode, heat storage mode and simultaneous cooling and heating mode;

[0047] Control the operation of the control valves and water pumps of the air conditioning unit according to the operating mode.

[0048] Furthermore, when the operation mode is the cold storage mode, the operation of the control valve and the water pump of the air-conditioning unit is controlled according to the operation mode, including:

[0049] The current operating time period is detected. When the current operating time period is night time, the second control valve, the third control valve, the seventh control valve, the twelfth control valve and the thirteenth control valve are controlled to be opened, and the first water pump is controlled to be opened at the same time.

[0050] Furthermore, when the operating mode is the cooling mode, controlling the operation of the control valve and the water pump of the air-conditioning unit according to the operating mode includes:

[0051] Control the first control valve, the fourth control valve, the fifth control valve, the seventh control valve, the thirteenth control valve, the fourteenth control valve and the twenty-first control valve to open, or control the first control valve, the fourth control valve, the ninth control valve and the fifteenth control valve to open; and simultaneously control the first water pump and the third water pump to open.

[0052] Furthermore, when the operation mode is the simultaneous cold and heat storage mode, the operation of the control valve and the water pump of the air-conditioning unit is controlled according to the operation mode, including:

[0053] Detect the current operating period. When the current operating period is night time, control the second control valve, the third control valve, the sixth control valve, the tenth control valve, the eleventh control valve, the fourteenth control valve and the eighteenth control valve to open, and control the first water pump and the second water pump to open at the same time.

[0054] Furthermore, when the operation mode is the heat storage mode, the operation of the control valve and the water pump of the air-conditioning unit is controlled according to the operation mode, including:

[0055] The first control valve, the sixth control valve, the eighth control valve, the eleventh control valve, the twelfth control valve and the sixteenth control valve are controlled to open, and the second water pump is controlled to open at the same time.

[0056] Furthermore, when the operation mode is the simultaneous cooling and heating mode, the operation of the control valve and the water pump of the air-conditioning unit is controlled according to the operation mode, including:

[0057] The fourth control valve, the fifth control valve, the eighth control valve, the thirteenth control valve, the fourteenth control valve, the seventeenth control valve, the nineteenth control valve and the twenty-first control valve are controlled to open, and the third water pump is controlled to open at the same time.

[0058] According to another aspect of the embodiments of the present invention, a storage medium containing computer-executable instructions is provided. When the computer-executable instructions are executed by a computer processor, the computer-executable instructions are used to perform the above-mentioned air-conditioning unit control method.

[0059] The present invention provides a flexible energy storage air conditioning system. The system is equipped with an energy storage device, including a first energy storage device and a second energy storage device. The first energy storage device is used to store cold water from a chiller, and the second energy storage device is used to store heat from a chiller. The energy storage device is used to cool the first heat exchanger and / or heat the second heat exchanger. The energy storage device avoids the problem of uneven cooling and heating in a full heat recovery system, thereby increasing system stability. Furthermore, the stored cold water in summer is used as a cold source for deep dehumidification, while the stored heat in winter is used to recover waste heat, improving the system's adjustability and cost-effectiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 is a schematic diagram of an optional structure of an air-conditioning unit according to an embodiment of the present invention;

[0061] Figure 2 is an optional flow chart of an air conditioning unit control method according to an embodiment of the present invention;

[0062] Figure 31 is a schematic diagram of an optional refrigerant flow path in a cold storage mode of an air-conditioning unit according to an embodiment of the present invention;

[0063] Figure 4 is a schematic diagram of an optional refrigerant flow path of an air-conditioning unit in a cooling mode according to an embodiment of the present invention;

[0064] Figure 5 is another optional refrigerant flow diagram of the cooling mode of the air-conditioning unit according to an embodiment of the present invention;

[0065] Figure 6 1 is a schematic diagram of an optional refrigerant flow path for an air-conditioning unit in a simultaneous cold and heat storage mode according to an embodiment of the present invention;

[0066] Figure 7 is a schematic diagram of an optional refrigerant flow path in a heat storage mode of an air-conditioning unit according to an embodiment of the present invention;

[0067] Figure 8 This is a schematic diagram of an optional refrigerant flow path in a simultaneous cooling and heating mode of an air-conditioning unit according to an embodiment of the present invention. DETAILED DESCRIPTION

[0068] Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. In the following description, when referring to the drawings, like numbers in different figures represent like or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present invention, as detailed in the appended claims.

[0069] Example 1

[0070] In a preferred embodiment 1 of the present invention, an air conditioning unit is provided. Specifically, Figure 1 An optional structural diagram of the unit is shown as follows: Figure 1 As shown, the unit includes:

[0071] Chiller 1;

[0072] A combined heat exchanger, connected to the chiller 1, includes a first heat exchanger 2 and a second heat exchanger 3;

[0073] The energy storage device is connected to the chiller 1 and the combined heat exchanger, and includes a first energy accumulator 4 and a second energy accumulator 5. The first energy accumulator 4 is used to store cold through the chiller 1, and the second energy accumulator 5 is used to store heat through the chiller 1. The energy storage device is used to provide cooling to the first heat exchanger 2 and / or heat to the second heat exchanger 3.

[0074] In the above embodiment, a flexible energy storage air conditioning system is provided. The system is equipped with an energy storage device, including a first energy storage device and a second energy storage device. The first energy storage device is used to store cold water from a chiller, and the second energy storage device is used to store heat from the chiller. The energy storage device is used to provide cooling to the first heat exchanger and / or heat to the second heat exchanger. The above energy storage device avoids the problem of uneven cooling and heating in a full heat recovery system, thereby increasing system stability. Furthermore, the stored cold water in summer is used as a cold source for deep dehumidification, while the stored heat in winter is used to recover waste heat, thereby improving the economic efficiency of the system.

[0075] In a preferred embodiment of the present invention, the chiller 1 is a dual-head chiller 1, comprising: a first water outlet, a first water inlet, a second water outlet and a second water inlet; one end of the first heat exchanger 2 is connected to the first water outlet, and the other end is connected to the first water inlet; one end of the second heat exchanger 3 is connected to the second water outlet, and the other end is connected to the second water inlet.

[0076] Preferably, the first accumulator 4 includes: a third water inlet, a third water outlet, a fourth water inlet and a fourth water outlet; the second accumulator 5 includes: a fifth water inlet, a fifth water outlet, a sixth water inlet and a sixth water outlet; wherein the fourth water outlet and the sixth water outlet are connected through a pipeline. Figure 1 As marked in the figure, the third water inlet is the cold water end, and the fifth water inlet is the warm water end.

[0077] like Figure 1 As shown, the control valve of this air conditioning unit includes:

[0078] A first control valve V1 is located on the pipeline between the first water outlet and the water inlet of the first heat exchanger 2; wherein a first connection point is provided on the pipeline between the first control valve V1 and the first water outlet, and a second connection point is provided on the pipeline between the first control valve V1 and the water inlet of the first heat exchanger 2, the first connection point is connected to the third water inlet via a pipeline, and the second connection point is connected to the third water inlet via a pipeline;

[0079] The second control valve V2 is located on the pipeline between the first connection point and the third water inlet, and on the pipeline between the second connection point and the third water inlet; the second control valve V2 is a two-way control valve that controls the on-off of the two pipelines at the same time;

[0080] The third control valve V3 is located on the pipeline between the third connection point and the fourth connection point; wherein the third connection point is located on the pipeline between the second connection point and the water inlet of the first heat exchanger 2, and the fourth connection point is located on the pipeline between the water outlet of the first heat exchanger 2 and the first water inlet;

[0081] The fourth control valve V4 is located on the pipeline between the third connection point and the first heat exchanger 2, and on the pipeline between the fourth connection point and the first heat exchanger 2. The fourth control valve V4 is also a two-way control valve, which controls the on-off of the two pipelines at the same time.

[0082] a fifth control valve V5 located on the pipeline between the fifth connection point and the water outlet of the second heat exchanger 3; wherein the fifth connection point is provided on the pipeline between the second control valve V2 and the third water outlet, and the fifth connection point is connected to the water outlet of the second heat exchanger 3 via a pipeline;

[0083] The sixth control valve V6 is located on the pipeline between the fifth water inlet and the second water outlet, and on the pipeline between the fifth water outlet and the second water inlet. The sixth control valve V6 is also a two-way control valve, which controls the on-off of the two pipelines at the same time.

[0084] The air conditioning unit further includes: a cooling tower 9 connected to the second water outlet and the second water inlet; and a condenser cleaning device 10 connected to the second water outlet and the second water inlet.

[0085] The seventh control valve V7 is located on the pipeline between the second water outlet and the cooling tower 9, and on the pipeline between the second water inlet and the cooling tower 9; the seventh control valve V7 is also a two-way control valve, which controls the on-off of the two pipelines at the same time;

[0086] An eighth control valve V8 is located on the pipeline between the sixth connection point and the fourth water inlet. A sixth connection point is also provided on the pipeline between the sixth control valve V6 and the fifth water outlet, and the fourth water inlet is further connected to the sixth connection point via a pipeline. A seventh connection point is also provided on the pipeline between the eighth control valve V8 and the fourth water inlet, and an eighth connection point is also provided on the pipeline between the fifth control valve V5 and the water outlet of the second heat exchanger 3.

[0087] a ninth control valve V9 located on the pipeline between the seventh connection point and the eighth connection point;

[0088] The tenth control valve V10 is located on the pipeline between the fifth water outlet and the sixth control valve V6;

[0089] an eleventh control valve V11, located on the pipeline between the fifth water inlet and the sixth control valve V6;

[0090] a twelfth control valve V12, located on the pipeline between the fourth water outlet and the sixth water outlet;

[0091] A thirteenth control valve V13 is located on the pipeline between the fifth water inlet and the ninth connection point; a ninth connection point is also provided between the second control valve V2 and the fifth connection point; and the fifth water inlet and the ninth connection point are also connected via a pipeline;

[0092] A fourteenth control valve V14 is located on the pipeline between the ninth connection point and the fifth connection point;

[0093] A fifteenth control valve V15 is located on the pipeline between the sixth water inlet and the tenth connection point. The sixth water inlet is connected to the water inlet of the second heat exchanger 3 via a pipeline. A tenth connection point is also provided on the pipeline between the sixth water inlet and the water inlet of the second heat exchanger 3. The fifth water outlet is also connected to the tenth connection point.

[0094] A sixteenth control valve V16 is located on the pipeline between the eighth control valve V8 and the sixth connection point. An eleventh connection point is also provided on the pipeline between the eighth control valve V8 and the sixteenth control valve V16. The eleventh connection point is connected to the water inlet of the first heat exchanger 2 through a pipeline.

[0095] A seventeenth control valve V17 is located on the pipeline between the eleventh connection point and the water inlet of the first heat exchanger 2;

[0096] An eighteenth control valve V18 is located on the pipeline between the third water outlet and the fifth connection point;

[0097] A nineteenth control valve V19 is located on the pipeline between the fourth water outlet and the twelfth connection point; wherein the twelfth connection point is located on the pipeline between the fourth control valve V4 and the fourth connection point;

[0098] a twentieth control valve V20 located on the pipeline between the water inlet of the second heat exchanger 3 and the thirteenth connection point; wherein the thirteenth connection point is located on the pipeline between the water inlet of the second heat exchanger 3 and the tenth connection point;

[0099] The twenty-first control valve V21 is located on the pipeline between the fifth water outlet and the tenth connection point.

[0100] In addition, if Figure 1 As shown, the air conditioning unit also includes:

[0101] a first water pump 6, located on the pipeline between the first water inlet and the fourth connection point;

[0102] The second water pump 7 is located in the pipeline between the sixth control valve V6 and the sixth connection point;

[0103] The third water pump 8 is located on the pipeline between the water outlet of the second heat exchanger 3 and the eighth connection point.

[0104] This air-conditioning unit uses an energy storage device to store heat to avoid the problem of uneven heating and cooling in the full heat recovery system. At the same time, it uses condensation heat recovery to recover waste heat. In the transition season (small indoor cooling load and high humidity), condensation heat is used as a reheat source, which reduces the initial investment of the system and enhances the resilience of the system. The energy storage tank flexibly stores energy, stores cold in summer and heat in winter, reduces the floor space, and improves the economy of the system.

[0105] Example 2

[0106] In a preferred embodiment 2 of the present invention, a method for controlling an air-conditioning unit is provided, which is applied to the air-conditioning unit in the above embodiment 1. Specifically, Figure 2 An optional flow chart of the method is shown as follows: Figure 2 As shown, the method includes the following steps S202-S204:

[0107] S202: Detecting the operating mode of the air conditioning unit; wherein the operating modes include at least: cold storage mode, cooling mode, simultaneous cold and heat storage mode, heat storage mode, and simultaneous cooling and heating mode;

[0108] S204: Control the operation of the control valve and water pump of the air-conditioning unit according to the operation mode.

[0109] In the above embodiment, a flexible energy storage air conditioning system is provided. The system is equipped with an energy storage device, including a first energy storage device and a second energy storage device. The first energy storage device is used to store cold water from a chiller, and the second energy storage device is used to store heat from the chiller. The energy storage device is used to provide cooling to the first heat exchanger and / or heat to the second heat exchanger. The above energy storage device avoids the problem of uneven cooling and heating in a full heat recovery system, thereby increasing system stability. Furthermore, the stored cold water in summer is used as a cold source for deep dehumidification, while the stored heat in winter is used to recover waste heat, thereby improving the economic efficiency of the system.

[0110] When the operating mode is the cold storage mode, the operation of the control valves and water pumps of the air-conditioning unit is controlled according to the operating mode, including: detecting the current operating period, and when the current operating period is the night period, controlling the second control valve, the third control valve, the seventh control valve, the twelfth control valve and the thirteenth control valve to open, and controlling the first water pump to open at the same time. Figure 3 A schematic diagram of the refrigerant flow path in cold storage mode is shown. The second, third, seventh, twelfth, and thirteenth control valves are open, while the remaining valves are closed. At night, the first accumulator serves as a cold storage device, and the dual-head chiller stores cold energy in the first accumulator using supply and return water at 4 / 12°C. During the day, the first accumulator serves as a cold source, supplying cold energy to the terminal.

[0111] When the operating mode is the cooling mode, the operation of the control valves and water pumps of the air-conditioning unit is controlled according to the operating mode, including: controlling the first control valve, the fourth control valve, the fifth control valve, the seventh control valve, the thirteenth control valve, the fourteenth control valve and the twenty-first control valve to open, and at the same time controlling the first water pump and the third water pump to open. Figure 4A schematic diagram of the refrigerant flow path in cooling mode is shown. As shown, the refrigerant flows from the cold water end of the energy storage device – the third water pump – the second heat exchanger (7 / 12°C) – the warm water end of the energy storage device, then to the chiller – the first water pump – the first heat exchanger (12 / 20°C) – the chiller. With the first and fourth control valves open and all other valves closed, the chiller provides 12 / 20°C water to the end-user for initial cooling. With the fifth, seventh, thirteenth, fourteenth, and twenty-first control valves open, the second energy storage device provides 4 / 12°C water for deep dehumidification. During the transitional season, indoor temperatures are low and humidity levels are high (due to the return of the south wind), resulting in low demand for cooling. The second energy storage device provides cooling for dehumidification.

[0112] Figure 5 Another optional schematic diagram shows the flow of refrigerant in cooling mode. If the temperature of the mixed air after dehumidification at the terminal is too low and it is directly sent to the room, it will affect the temperature perceived by the human body surface. At this time, the ninth control valve and the fifteenth control valve are opened, and the heat in the second energy storage device is transferred to the second heat exchanger to heat the mixed air after dehumidification by the first heat exchanger. After reaching the supply air temperature, it is sent to the room, and the water after heat exchange enters the first energy storage device. The mixed air after dehumidification is heated by the energy storage device. Since its load is uncertain and the heat demand is variable, when the required heat is less than the supplied heat, the energy storage device stores the excess heat. When the required heat is greater than the supplied heat, the heat stored in the energy storage device is used to supplement the insufficient heat, realizing waste heat recovery. Traditional air-conditioning units require electric heating and reheating of chilled water after dehumidification. The present invention saves costs, improves the economy of the system, and achieves the purpose of flexible heating.

[0113] When the operating mode is the simultaneous cold and heat storage mode, the operation of the control valves and water pumps of the air-conditioning unit is controlled according to the operating mode, including: detecting the current operating period, and when the current operating period is the night period, controlling the second control valve, the third control valve, the sixth control valve, the tenth control valve, the eleventh control valve, the fourteenth control valve and the eighteenth control valve to open, and simultaneously controlling the first water pump and the second water pump to open. Figure 6 The diagram shows the refrigerant flow path in the simultaneous cold and heat storage mode. As shown in the figure, the second, third, sixth, tenth, eleventh, fourteenth, and eighteenth control valves are open, while the remaining valves are closed. During nighttime, the chiller stores cold energy in one accumulator, while simultaneously storing the generated heat in the other. During daytime, the fourth, fifth, eighth, fourteenth, fifteenth, seventeenth, and nineteenth control valves are open, while the remaining valves are closed. The first accumulator serves as a cold source, supplying heat to the first heat exchanger at the end. If heated air is required, the stored heat can also be transferred from the second accumulator to the second heat exchanger.

[0114] When the operating mode is the heat storage mode, the operation of the control valves and water pumps of the air-conditioning unit is controlled according to the operating mode, including: controlling the first control valve, the sixth control valve, the eighth control valve, the eleventh control valve, the twelfth control valve and the sixteenth control valve to open, and controlling the second water pump to open at the same time. Figure 7 The diagram shows the refrigerant flow path in thermal storage mode. As shown, the chiller provides 7 / 12°C water for terminal dehumidification. The condensation heat is recovered and stored in the second accumulator, which serves as a reheat source for the system, achieving flexible thermal storage and heating. The chiller generates additional heat while cooling. By opening the first, sixth, eighth, eleventh, twelfth, and sixteenth control valves and closing all other valves, the chiller provides cooling for the first heat exchanger while the cooling water flows through the heat recovery bypass pipe to the second accumulator for storage as a reheat source.

[0115] When the operating mode is the simultaneous cooling and heating mode, the operation of the control valves and water pumps of the air-conditioning unit is controlled according to the operating mode, including: controlling the fourth control valve, the fifth control valve, the eighth control valve, the thirteenth control valve, the fourteenth control valve, the seventeenth control valve, the nineteenth control valve and the twenty-first control valve to open, and simultaneously controlling the third water pump to open. Figure 8 A schematic diagram of the refrigerant flow path in the simultaneous cooling and heating mode is shown. As shown in the figure, the first energy accumulator provides cold water to the first heat exchanger for cooling, and the second energy accumulator provides heat to the second heat exchanger to increase the temperature of the mixed air after the first heat exchanger, preventing low-temperature cold air from being directly delivered to the room and affecting human comfort.

[0116] The above-mentioned air-conditioning units can be used in museums, archives and other environments with strict humidity requirements. They not only solve the problem of supply air temperature after dehumidification in extreme weather, but also avoid wasting energy by adding a reheating section. In summer, the energy storage device stores cold water for deep dehumidification cold source, while in winter, it stores heat to realize waste heat recovery and utilization, thereby improving the economy of the system. At the same time, flexible energy storage is proposed to increase system stability and adjustability.

[0117] Example 3

[0118] Based on the air conditioning unit control method provided in the above embodiment 2, a storage medium containing computer executable instructions is further provided in a preferred embodiment 3 of the present invention. When the computer executable instructions are executed by a computer processor, they are used to execute the air conditioning unit control method as described above.

[0119] In the above embodiment, a flexible energy storage air conditioning system is provided. The system is equipped with an energy storage device, including a first energy storage device and a second energy storage device. The first energy storage device is used to store cold water from a chiller, and the second energy storage device is used to store heat from the chiller. The energy storage device is used to provide cooling to the first heat exchanger and / or heat to the second heat exchanger. The above energy storage device avoids the problem of uneven cooling and heating in a full heat recovery system, thereby increasing system stability. Furthermore, the stored cold water in summer is used as a cold source for deep dehumidification, while the stored heat in winter is used to recover waste heat, thereby improving the economic efficiency of the system.

[0120] Other embodiments of the present invention will readily occur to those skilled in the art after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not invented herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the invention being indicated by the following claims.

[0121] It should be understood that the present invention is not limited to the exact construction described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. An air conditioning unit, characterized in that: include: Chiller (1); A combined heat exchanger connected to the chiller (1), comprising a first heat exchanger (2) and a second heat exchanger (3); An energy storage device is connected to the chiller (1) and the combined heat exchanger, and comprises a first energy storage device (4) and a second energy storage device (5), wherein the first energy storage device (4) is used for storing cold through the chiller (1), and the second energy storage device (5) is used for storing heat through the chiller (1), and the energy storage device is used for supplying cold to the first heat exchanger (2) and / or supplying heat to the second heat exchanger (3); The chiller (1) is a dual-head chiller (1), comprising: a first water outlet, a first water inlet, a second water outlet, and a second water inlet; one end of the first heat exchanger (2) is connected to the first water outlet, and the other end is connected to the first water inlet; one end of the second heat exchanger (3) is connected to the second water outlet, and the other end is connected to the second water inlet; The first energy accumulator (4) comprises: a third water inlet, a third water outlet, a fourth water inlet and a fourth water outlet; the second energy accumulator (5) comprises: a fifth water inlet, a fifth water outlet, a sixth water inlet and a sixth water outlet; The operation modes of the air conditioning unit include at least: cold storage mode, cooling mode, simultaneous cold and heat storage mode, heat storage mode and simultaneous cooling and heating mode; In the cold storage mode, the first water outlet of the chiller (1) is connected to the third water inlet of the first energy accumulator (4), the fourth water outlet of the first energy accumulator (4) is connected to the sixth water outlet of the second energy accumulator (5), and the fifth water inlet of the second energy accumulator (5) is connected to the first water inlet of the chiller (1), and the first energy accumulator (4) stores cold through the chiller (1); In the cooling mode, the chiller (1) is connected to the first heat exchanger (2), the fifth water inlet of the second energy accumulator (5) is connected to one end of the second heat exchanger (3), the fifth water outlet of the second energy accumulator (5) is connected to the other end of the second heat exchanger (3), and the second energy accumulator (5) supplies cooling to the second heat exchanger (3) for dehumidification; In the simultaneous cold and heat storage mode, the first water outlet of the chiller (1) is connected to the third water inlet of the first accumulator (4), the third water outlet of the first accumulator (4) is connected to the first water inlet of the chiller (1), the second water outlet of the chiller (1) is connected to the fifth water inlet of the second accumulator (5), the fifth water outlet of the second accumulator (5) is connected to the second water inlet of the chiller (1), the first accumulator (4) stores cold through the chiller (1), and the second accumulator (5) stores heat through the chiller (1); In the heat storage mode, the chiller (1) is connected to the first heat exchanger (2) to supply cooling to the first heat exchanger (2), the second water outlet of the chiller (1) is connected to the fifth water inlet of the second accumulator (5), the fourth water outlet of the first accumulator (4) is connected to the sixth water outlet of the second accumulator (5), the fourth water inlet of the first accumulator (4) is connected to the second water inlet of the chiller (1), and the second accumulator (5) stores heat through the chiller (1); In the simultaneous cooling and heating mode, one end of the first heat exchanger (2) is connected to the fourth water outlet of the first accumulator (4), and the other end of the first heat exchanger (2) is connected to the fourth water inlet of the first accumulator (4), and the first accumulator (4) provides cooling for the first heat exchanger (2); one end of the second heat exchanger (3) is connected to the fifth water inlet of the second accumulator (5), and the other end of the second heat exchanger (3) is connected to the fifth water outlet of the second accumulator (5), and the second accumulator (5) provides heating for the second heat exchanger (3).

2. The air conditioning unit according to claim 1, characterized in that: Also includes: a first control valve (V1) located on the pipeline between the first water outlet and the water inlet of the first heat exchanger (2); wherein a first connection point is provided on the pipeline between the first control valve (V1) and the first water outlet, and a second connection point is provided on the pipeline between the first control valve (V1) and the water inlet of the first heat exchanger (2), the first connection point being connected to the third water inlet via a pipeline, and the second connection point being connected to the third water inlet via a pipeline; a second control valve (V2) located on the pipeline between the first connection point and the third water inlet, and on the pipeline between the second connection point and the third water inlet; a third control valve (V3) located on the pipeline between a third connection point and a fourth connection point; wherein the third connection point is located on the pipeline between the second connection point and the water inlet of the first heat exchanger (2), and the fourth connection point is located on the pipeline between the water outlet of the first heat exchanger (2) and the first water inlet; A fourth control valve (V4) is located on the pipeline between the third connection point and the first heat exchanger (2), and on the pipeline between the fourth connection point and the first heat exchanger (2).

3. The air conditioning unit according to claim 2, characterized in that: A fifth connection point is provided on the pipeline between the second control valve (V2) and the third water outlet, and the fifth connection point is connected to the water outlet of the second heat exchanger (3) through a pipeline; the air conditioning unit further comprises: a fifth control valve (V5) located on the pipeline between the fifth connection point and the water outlet of the second heat exchanger (3); The sixth control valve (V6) is located on the pipeline between the fifth water inlet and the second water outlet, and on the pipeline between the fifth water outlet and the second water inlet.

4. The air conditioning unit according to claim 3, characterized in that: Also includes: a cooling tower (9), connected to the second water outlet and the second water inlet; a seventh control valve (V7), located on the pipeline between the second water outlet and the cooling tower (9), and on the pipeline between the second water inlet and the cooling tower (9); A condenser cleaning device (10) is connected to the second water outlet and the second water inlet.

5. The air conditioning unit according to claim 4, characterized in that: A sixth connection point is further provided on the pipeline between the sixth control valve (V6) and the fifth water outlet, and the fourth water inlet is further connected to the sixth connection point via a pipeline; the air conditioning unit further comprises: an eighth control valve (V8) located on the pipeline between the sixth connection point and the fourth water inlet; wherein a seventh connection point is also provided on the pipeline between the eighth control valve (V8) and the fourth water inlet, and an eighth connection point is also provided on the pipeline between the fifth control valve (V5) and the water outlet of the second heat exchanger (3); a ninth control valve (V9), located on the pipeline between the seventh connection point and the eighth connection point; a tenth control valve (V10), located on the pipeline between the fifth water outlet and the sixth control valve (V6); an eleventh control valve (V11), located on the pipeline between the fifth water inlet and the sixth control valve (V6); The twelfth control valve (V12) is located on the pipeline between the fourth water outlet and the sixth water outlet.

6. The air conditioning unit according to claim 3, characterized in that: A ninth connection point is further provided between the second control valve (V2) and the fifth connection point; the fifth water inlet and the ninth connection point are further connected via a pipeline; the air conditioning unit further comprises: a thirteenth control valve (V13), located on the pipeline between the fifth water inlet and the ninth connection point; A fourteenth control valve (V14) is located on the pipeline between the ninth connection point and the fifth connection point.

7. The air conditioning unit according to claim 5, characterized in that: The sixth water inlet is connected to the water inlet of the second heat exchanger (3) via a pipeline, a tenth connection point is further provided on the pipeline between the sixth water inlet and the water inlet of the second heat exchanger (3), and the fifth water outlet is further connected to the tenth connection point; the air conditioning unit further comprises: a fifteenth control valve (V15), located on the pipeline between the sixth water inlet and the tenth connection point; a sixteenth control valve (V16) located on the pipeline between the eighth control valve (V8) and the sixth connection point; an eleventh connection point is also provided on the pipeline between the eighth control valve (V8) and the sixteenth control valve (V16), the eleventh connection point being connected to the water inlet of the first heat exchanger (2) via a pipeline; a seventeenth control valve (V17) located on the pipeline between the eleventh connection point and the water inlet of the first heat exchanger (2); an eighteenth control valve (V18), located on the pipeline between the third water outlet and the fifth connection point; a nineteenth control valve (V19) located on the pipeline between the fourth water outlet and the twelfth connection point; wherein the twelfth connection point is located on the pipeline between the fourth control valve (V4) and the fourth connection point; a twentieth control valve (V20) located on the pipeline between the water inlet of the second heat exchanger (3) and the thirteenth connection point; wherein the thirteenth connection point is located on the pipeline between the water inlet of the second heat exchanger (3) and the tenth connection point; The twenty-first control valve (V21) is located on the pipeline between the fifth water outlet and the tenth connection point.

8. The air conditioning unit according to claim 5, characterized in that: Also includes: a first water pump (6) located on the pipeline between the first water inlet and the fourth connection point; a second water pump (7) located on the pipeline between the sixth control valve (V6) and the sixth connection point; The third water pump (8) is located on the pipeline between the water outlet of the second heat exchanger (3) and the eighth connection point.

9. A method for controlling an air conditioning unit, applied to the air conditioning unit according to any one of claims 1 to 8, characterized in that: The method comprises: Detecting the operating mode of the air-conditioning unit; wherein the operating modes include at least: cold storage mode, cooling mode, simultaneous cold and heat storage mode, heat storage mode and simultaneous cooling and heating mode; The operation of the control valve and the water pump of the air conditioning unit is controlled according to the operation mode.

10. The method according to claim 9, characterized in that When the operating mode is the cold storage mode, controlling the operation of the control valve and the water pump of the air-conditioning unit according to the operating mode includes: The current operating period is detected. When the current operating period is nighttime, the second control valve, the third control valve, the seventh control valve, the twelfth control valve and the thirteenth control valve are controlled to be open, and the first water pump is controlled to be open.

11. The method according to claim 9, characterized in that When the operating mode is the cooling mode, controlling the operation of the control valve and the water pump of the air-conditioning unit according to the operating mode includes: Controlling the first control valve, the fourth control valve, the fifth control valve, the seventh control valve, the thirteenth control valve, the fourteenth control valve, and the twenty-first control valve to be open, or controlling the first control valve, the fourth control valve, the ninth control valve, and the fifteenth control valve to be open; At the same time, the first water pump and the third water pump are controlled to start.

12. The method according to claim 9, characterized in that When the operating mode is the simultaneous cold and heat storage mode, controlling the operation of the control valve and the water pump of the air-conditioning unit according to the operating mode includes: Detect the current operating period. When the current operating period is the night period, control the second control valve, the third control valve, the sixth control valve, the tenth control valve, the eleventh control valve, the fourteenth control valve and the eighteenth control valve to open, and control the first water pump and the second water pump to open at the same time.

13. The method according to claim 9, characterized in that When the operating mode is the heat storage mode, controlling the operation of the control valve and the water pump of the air-conditioning unit according to the operating mode includes: The first control valve, the sixth control valve, the eighth control valve, the eleventh control valve, the twelfth control valve and the sixteenth control valve are controlled to open, and the second water pump is controlled to open at the same time.

14. The method according to claim 9, characterized in that When the operating mode is the simultaneous cooling and heating mode, controlling the operation of the control valve and the water pump of the air-conditioning unit according to the operating mode includes: The fourth control valve, the fifth control valve, the eighth control valve, the thirteenth control valve, the fourteenth control valve, the seventeenth control valve, the nineteenth control valve and the twenty-first control valve are controlled to open, and the third water pump is controlled to open at the same time.

15. A storage medium containing computer-executable instructions, characterized in that: When the computer executable instructions are executed by a computer processor, they are used to perform the air conditioning unit control method according to any one of claims 9 to 14.

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