Indirect high-efficiency cold storage air conditioning system

Abstract

The utility model relates to air conditioning system energy -conserving technology especially is indirect high -efficient cold storage air conditioning system. Technical scheme includes air conditioning system, cold storage device and heat exchanger. Two heat exchange pipelines of heat exchanger connect the coolant pipeline of air conditioning system and the coolant pipeline of cold storage device respectively. Air conditioning system is composed of host computer and multiple parallel air conditioning terminal groups, and the host computer forms a loop with the terminal group through the coolant pipeline, and multiple control elements are arranged on the pipeline. The heat exchanger is connected in parallel or series with the host computer, the control scheme is simplified through specific coolant pipeline, the operation and maintenance cost is reduced, and the system stability is improved.

Description

Technical Field

[0001] This utility model relates to the field of energy-saving technology for air conditioning systems, and in particular to an indirect, high-efficiency cold storage air conditioning system. Background Technology

[0002] With the widespread application of water-based cooling technology in air conditioning systems, optimizing system control logic and reducing operational complexity has become a key focus in the industry. Traditional indirect water-based cooling air conditioning systems typically employ multi-stage valve regulation, complex piping switching, and multi-pump coordinated control to achieve various operating modes such as cooling storage, cooling release, and mixed cooling. However, such systems present significant problems in practical applications:

[0003] The complexity of the control structure is a particularly prominent issue. Traditional systems rely on a large number of electric valves, proportional valves, and independently controlled water pumps, and mode switching can only be achieved through dense sensor signal feedback and linkage with the central controller. In the modes of main unit cooling, cold storage tank cooling, or combined cooling, the system needs to frequently adjust valve opening, pump speed, and pipeline flow direction. This complex control logic not only leads to command redundancy but also causes hydraulic oscillations due to signal transmission delays, seriously affecting system stability.

[0004] High operation and maintenance costs are a consequence. The complex control structure requires high-precision sensors and specialized control methods, increasing both initial equipment investment and the difficulty of daily troubleshooting. When multiple valves operate in tandem, differences in response time can easily cause hydraulic shocks, which, over time, accelerate pipe joint aging and pump wear, further increasing energy consumption and equipment replacement frequency. Furthermore, traditional cold storage devices lack real-time water level monitoring mechanisms, and manual inspections are insufficient to prevent the risk of overflow or idling in the cold storage tank, posing safety hazards.

[0005] To address the aforementioned issues, existing technologies urgently need improvement. Summary of the Invention

[0006] To address the aforementioned problems, the purpose of this invention is to provide an indirect, high-efficiency cold storage air conditioning system, which has the advantages of simplified control structure, reduced operation and maintenance costs, and improved system stability.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] This application provides an indirect, high-efficiency cold storage air conditioning system, the technical solution of which is as follows: It includes an air conditioning system, a cold storage device, and a heat exchanger; a first heat exchange pipe in the heat exchanger is connected to the refrigerant pipe of the air conditioning system, and a second heat exchange pipe is connected to the coolant pipe of the cold storage device; the air conditioning system includes an air conditioning unit and an air conditioning terminal group composed of multiple air conditioning terminals connected in parallel; the air conditioning unit is connected to the air conditioning terminal group through the first and second refrigerant pipes to form a loop.

[0009] An electric proportional valve V1 and a refrigeration pump are sequentially installed on the first refrigerant pipeline L1;

[0010] - The heat exchanger is connected in parallel or series with the air conditioning unit via the third refrigerant line L3 and the fourth refrigerant line L4, wherein:

[0011] - The third refrigerant line L3 is connected to the first refrigerant line L1 between the air conditioning unit and the electric proportional valve V1. The first cold storage pump 3 and the electric valve V3 are installed on the third refrigerant line L3 in sequence.

[0012] - The fourth refrigerant line L4 is connected to the second refrigerant line L2;

[0013] The third refrigerant line L3 is connected to the first refrigerant line L1 via the fifth refrigerant line L5. One end of the fifth refrigerant line L5 is connected to the first refrigerant line L1 between the electric proportional valve V1 and the refrigeration pump 13, and the other end is connected to the third refrigerant line L3 between the first cold storage pump and the heat exchanger. An electric proportional valve V2 is installed on the fifth refrigerant line L5.

[0014] In this scheme, the air conditioning unit and heat exchanger can form independent closed-loop circuits through refrigerant piping to directly supply cooling to the air conditioning terminals, with a clearly defined basic circulation path. Alternatively, the heat exchanger can be connected in parallel with the air conditioning unit, simultaneously supplying cooling to the terminals. This structure reduces the number of valves through parallel piping design, utilizing electric proportional valves V1 and V2 to simultaneously adjust the flow ratio between the unit and the heat exchanger, reducing the complexity of multi-valve coordinated control and avoiding the loss of cooling capacity and pressure caused by series structures. In another scheme, the air conditioning unit and heat exchanger can form a series circuit through refrigerant piping to directly supply cooling to the heat exchanger, which then stores cold energy in a cold storage tank. Closing electric valves V1 and V2 and opening electric valve V3 creates a closed-loop refrigerant circulation circuit between the air conditioning unit and the heat exchanger, powered by the first cold storage pump 3. This, combined with the second cold storage pump on the other side of the heat exchanger, completes the cold energy storage in the cold storage tank.

[0015] Furthermore, this application also proposes that the cold storage device includes a cold storage tank for storing cold energy by storing cooling liquid;

[0016] - The coolant piping includes a first coolant piping and a second coolant piping, which are respectively connected to the two ends of the second heat exchange piping of the cold storage tank and the heat exchanger.

[0017] - A third coolant line is connected in parallel to the second coolant line, and a cold release pump and a cold storage pump are respectively installed on the second coolant line and the third coolant line.

[0018] In this scheme, the cold storage tank serves as a cold energy storage unit, storing cold energy through changes in the sensible heat of water. The first and second / third coolant pipelines form a closed loop, enabling cooling water circulation between the heat exchanger and the cold storage tank. Independent release pumps and cold storage pumps are configured on the parallel second and third coolant pipelines, respectively, achieving physical isolation between cold storage and release operations. This design avoids hydraulic interference caused by bidirectional flow in a single pipeline by using separate pump sets, while also simplifying valve operation requirements during mode switching. This scheme replaces traditional valve switching control with physically isolated pump sets, reducing the complexity of dynamic system adjustment. The release pump is dedicated to cold energy release operations, while the cold storage pump is dedicated to cold energy storage operations; their independent operation avoids hydraulic coupling and improves system stability.

[0019] Furthermore, this application also proposes that an electric proportional valve V5 and an electric proportional valve V6 are respectively installed on the second coolant pipeline and the third coolant pipeline.

[0020] Furthermore, this application also proposes that a float switch for monitoring the water level is installed in the cold storage tank.

[0021] Furthermore, this application also proposes that an exhaust valve be installed at the highest point of both the first and second refrigerant pipelines.

[0022] As can be seen from the above, the indirect high-efficiency cold storage air conditioning system and its cold storage device and water level monitoring structure provided in this application reduce control command redundancy and hydraulic oscillation by optimizing pipeline layout and valve settings, and are equipped with a water level monitoring mechanism, which has the advantages of simplifying the control structure, reducing operation and maintenance costs and improving system stability. Attached Figure Description

[0023] Figure 1 A schematic diagram of an indirect, high-efficiency cold storage air conditioning system provided in this application.

[0024] Figure 2 This is a table of pump and solenoid valve switch combinations for the species operation mode of an indirect high-efficiency cold storage air conditioning system. Detailed Implementation

[0025] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0026] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", 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 utility model 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 utility model.

[0027] Furthermore, 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] like Figure 1 As shown, this embodiment relates to an indirect, high-efficiency cold storage air conditioning system, including an air conditioning system, a cold storage device, and a heat exchanger 4. A first heat exchange pipe 41 within the heat exchanger 4 is connected to the refrigerant pipe of the air conditioning system, and a second heat exchange pipe 42 is connected to the coolant pipe of the cold storage device. The air conditioning system includes an air conditioning unit 1 and an air conditioning terminal group composed of multiple air conditioning terminals 2 connected in parallel.

[0031] The air conditioning unit 1 is connected to the air conditioning terminal group through a first refrigerant line L1 and a second refrigerant line L2 to form a loop. An electric proportional valve V1 and a chilled water pump 13 are sequentially installed on the first refrigerant line L1. The heat exchanger 4 is connected to the air conditioning unit 1 through a third refrigerant line L3 and a fourth refrigerant line L4. The third refrigerant line L3 is connected to the first refrigerant line L1 between the air conditioning unit 1 and the electric proportional valve V1. A third refrigerant line L3 is sequentially installed on the third refrigerant line L3. The first cold storage pump 3 and the electric valve V3 are connected; the fourth refrigerant line L4 is connected to the second refrigerant line L2; the third refrigerant line L3 is connected to the first refrigerant line L1 via the fifth refrigerant line L5. One end of the fifth refrigerant line L5 is connected to the first refrigerant line L1 between the electric proportional valve V1 and the chilled water pump 13, and the other end is connected to the third refrigerant line L3 between the first cold storage pump 3 and the heat exchanger 4. The electric proportional valve V2 is installed on the fifth refrigerant line L5. The electric proportional valves V1 and V2 can be linear regulating valves or intelligent flow control valves, and their opening degree is precisely adjusted by a PID controller or fuzzy control algorithm. The first cold storage pump 3 and the chilled water pump 13 can be variable frequency centrifugal pumps, and the flow rate can be steplessly adjusted by changing the speed. The electric valve V3 can be an electric butterfly valve for quickly switching the on / off state of the pipeline.

[0032] In this technical solution, the air conditioning unit 1 and the heat exchanger 4 can form independent closed-loop circuits through refrigerant pipelines to directly supply cooling to the air conditioning terminal 2. Alternatively, the heat exchanger 4 can be connected in parallel with the air conditioning unit 1, simultaneously supplying cooling to the air conditioning terminal 2. This structure reduces the number of valves through parallel piping design, and utilizes electric proportional valves V1 and V2 to simultaneously adjust the flow ratio between the unit and the heat exchanger, reducing the complexity of multi-valve coordinated control and avoiding the loss of cooling capacity and pressure caused by series structures. This simplifies the system control logic, reduces valve operation frequency and failure risk, and improves the response speed when switching between different operating modes. Compared with existing technologies, this structure effectively reduces the number of control components and maintenance complexity while ensuring heat exchange efficiency.

[0033] like Figure 1 As shown, the cold storage device includes a cold storage tank 5, used to store cooling capacity by storing cooling liquid. This system supports various cooling liquids (such as cooling water, ethylene glycol solution, or nanofluids), and the capacity of the cold storage tank and pump parameters can be adjusted according to the specific heat capacity and thermal conductivity of the liquid to optimize system energy efficiency. The cold storage tank can adopt a non-pressurized, sealed design to ensure the stability of the cooling liquid.

[0034] The coolant pipeline includes a first coolant pipeline L6 and a second coolant pipeline L7, which are respectively connected to the two ends of the second heat exchange pipeline 42 of the cold storage tank 5 and the heat exchanger 4; a third coolant pipeline L8 is connected in parallel to the second coolant pipeline L7, and a cold release pump 9 and a cold storage pump 10 are respectively installed on the second coolant pipeline L7 and the third coolant pipeline L8.

[0035] Specifically, the cold storage tank 5 can be made of concrete or stainless steel, and an internal temperature sensor is installed to monitor water temperature changes. The first coolant pipeline L6 and the second coolant pipeline L7 can be designed with the same or different diameters, and the parallel structure of the second coolant pipeline L7 and the third coolant pipeline L8 is achieved through a tee joint. The release pump 9 and the second cold storage pump 10 are preferably variable frequency centrifugal pumps, and their rated flow rates are determined based on the heat load of the heat exchanger 4. This technical solution achieves a physically isolated hydraulic system by separating the second cold storage pump 10 and the release pump 9. The second cold storage pump 10 is dedicated to transferring the heat of the refrigerant in the air conditioning system to the cold storage tank 5, while the release pump 9 is dedicated to transferring the cold energy from the cold storage tank 5 to the heat exchanger 4. This avoids the flow conflict problem of a single pump unit operating in both directions in traditional systems, and also eliminates hydraulic fluctuations caused by valve switching. By independently controlling the pump units, the system can adjust the cold storage rate and cold release intensity according to actual needs. For example, during cold storage, the flow rate of the second cold storage pump 10 can be adjusted to meet the cold storage temperature requirements, or the output of the cold release pump 9 can be quickly responded to when the air conditioning load changes abruptly. This design simplifies the dynamic adjustment process to single-variable pump speed control, significantly reducing the complexity of hydraulic balance adjustment.

[0036] In this design, electric proportional valves V5 and V6 are respectively installed on the second coolant line L7 and the third coolant line L8. Electric proportional valves V5 and V6 employ continuously adjustable electric actuators, achieving linear adjustment of their opening degree within the range of 0-100% by receiving analog signals from a PLC or DDC controller. Furthermore, the flow characteristics of the electric proportional valves can be selected as equal percentage type to match the nonlinear relationship between flow rate and pressure drop in the coolant lines. In terms of control logic, electric proportional valve V5 is connected in series with the cold release pump 9, and electric proportional valve V6 is connected in series with the cold storage pump 10. When switching to the cooling release mode, the cooling release pump 9 drives the coolant to circulate through the second coolant line L7 and the first coolant line L6. The adjustment signal of V5 comes from the temperature difference feedback between the inlet and outlet of the heat exchanger 4 on the cooling side. When switching to the cold storage mode, the cold storage pump 10 drives the coolant to circulate through the first coolant line L6 and the third coolant line L8. The adjustment signal of V6 is based on the temperature difference between the inlet and outlet water of the cold storage tank 5 and the required cold storage temperature. When one of V5 and V6 is in operation, the other must be in the off state.

[0037] Typically, when the cold release pump 9 and the second cold storage pump 10 are fixed-frequency water pumps, electric proportional valves are selected for V5 and V6; when the cold release pump 9 and the second cold storage pump 10 are variable-frequency water pumps, electric valves can be selected for V5 and V6. In this case, the temperature control purpose is achieved through the flow regulation function of the variable-frequency water pump.

[0038] This technical solution achieves precise dynamic flow distribution during cold storage / release operations through the coordinated control of electric proportional valves in parallel pipelines or the variable frequency control of water pumps. Specifically, during the cold release process, the electric proportional valve V5 adjusts its opening in real time according to the cooling load demand of the air conditioning terminal 2, ensuring precise matching between the cooling water flow rate output by the cold release pump 9 and the heat exchange capacity of the heat exchanger 4, avoiding excessive flow losses caused by fixed throttling. During the cold storage process, the flow rate is changed by adjusting the frequency of the second cold storage pump 10 or the opening of the electric proportional valve to meet the cold storage temperature requirements. Compared with existing technologies, this solution achieves the adjustment effect that traditional multi-valve group coordination requires by simplifying the control structure (requiring only two proportional valves), significantly improving system reliability and energy efficiency ratio.

[0039] Furthermore, a float switch 11 for monitoring water level is installed in the cold storage tank 5. The float switch 11 monitors water level through the principle of mechanical buoyancy, and its core components include a float, a linkage mechanism, and electrical contacts. As a preferred embodiment, the float can adopt a hollow sealed structure, made of corrosion-resistant engineering plastic or stainless steel, with a density lower than water to ensure free floating with the rise and fall of water level. The linkage mechanism converts the vertical displacement of the float into horizontal or rotational motion, thereby triggering electrical signal devices such as microswitches or reed switches. Specifically, when the water level rises to the upper threshold, the float drives the linkage to close the high-level contact, outputting a high-level signal; when the water level drops to the lower threshold, it triggers the low-level contact to open. Thus, the control system can obtain the water level status in real time without relying on electronic level sensors. This technical solution directly senses water level changes through a mechanical structure, avoiding the defects of electronic sensors that are easily affected by water quality and temperature. The contact signals of the float switch 11 can be directly connected to a PLC or relay control circuit to regulate the start and stop of the water pump or the opening and closing of the valve.

[0040] Furthermore, vent valves 12 are installed at the highest points of both the first refrigerant line L1 and the second refrigerant line L2. The vent valves 12 can be either float-type automatic vent valves or lever-type mechanical vent valves. The float-type vent valve automatically opens and closes by sensing the amount of gas accumulation through buoyancy, while the lever-type vent valve triggers venting action based on a preset pressure threshold. The installation location of the vent valves 12 needs to be determined through fluid dynamics simulation based on the pipeline routing to ensure it is located in the actual gas accumulation area during operation. This technical solution solves the problem of reduced heat transfer efficiency caused by gas accumulation in a closed-loop system through a dual-pipeline high-point synchronous venting design. Specifically, gas tends to stagnate at high points in the pipeline due to pressure changes during refrigerant flow, forming gas resistance and corroding the pipe walls. By installing vent valves 12 at the highest points of the bidirectional circulation pipelines, gas can be discharged in real time, maintaining a single-phase fluid state. Compared to traditional manual periodic venting operations, this design reduces the frequency of maintenance intervention and avoids system energy efficiency fluctuations caused by untimely venting.

[0041] Combined with appendix Figure 1 and 2 The following are media path descriptions for six operating modes based on the improved connection structure, ensuring the accuracy of component sequence and flow direction:

[0042] Mode 1: Cooling only by the main unit

[0043] - Enable component:

[0044] -Valve: Electric valve V1

[0045] - Water pump: Chilling pump

[0046] - Running path:

[0047] 1. Refrigerant path:

[0048] Air conditioning unit 1 → L1 (electric valve V1 opens → chilled water pump 13) → air conditioning terminal group 2 → L2 → return to air conditioning unit 1.

[0049] 2. Coolant path:

[0050] The cold storage tank circuit is closed, and there is no flow.

[0051] Mode 2: Host nighttime cooling

[0052] - Enable component:

[0053] - Valves: Electric valve V3, Electric proportional valve V6

[0054] - Water pumps: First cold storage pump, Second cold storage pump

[0055] - Running path:

[0056] 1. Refrigerant path:

[0057] Air conditioning unit (1) → L3 (electric valve V3 opens → first cold storage pump 3) → first heat exchange pipeline of heat exchanger 4 → L4 → L2 → return to air conditioning unit 1.

[0058] 2. Coolant path:

[0059] Cold storage tank 5 → First coolant pipeline L6 → Second heat exchange pipeline of heat exchanger 4 → Third coolant pipeline L8 (electric proportional valve V6 opens → Second cold storage pump 10) → Return to cold storage tank 5.

[0060] Mode 3: Cooling only from the cold storage tank

[0061] - Enable component:

[0062] - Valves: Electric proportional valve V2, electric proportional valve V5

[0063] - Water pumps: chilled water pumps, cold release pumps

[0064] - Running path:

[0065] 1. Refrigerant path:

[0066] The first heat exchange pipeline of heat exchanger 4 → L3 → L5 (electric proportional valve V2 opens) → L1 → chilled pump 13 → air conditioning terminal group 2 → L2 → L4 → return to heat exchanger 4.

[0067] 2. Coolant path:

[0068] Cold storage tank 5 → Second coolant pipeline L7 (cold release pump → electric proportional valve V5 opens) → Second heat exchange pipeline of heat exchanger 4 → First coolant pipeline L6 → Return to cold storage tank 5.

[0069] Mode 4: Simultaneous cooling by the main unit and the cold storage tank

[0070] - Enable component:

[0071] - Valves: Electric valve V1, electric proportional valve V2, electric proportional valve V5

[0072] - Water pumps: chilled water pumps, cold release pumps

[0073] - Running path:

[0074] 1. Refrigerant path:

[0075] - Main unit branch: Air conditioning main unit 1 → L1 (V1 turns on → chilled water pump 13) → Air conditioning terminal group 2 → L2 → return to air conditioning main unit 1.

[0076] - Cold storage tank branch: Heat exchanger 4 → L3 → L5 (electric proportional valve V2 opens) → L1 → chilled pump 13 → air conditioning terminal group 2 → L2 → L4 → return to heat exchanger 4.

[0077] 2. Coolant path:

[0078] Cold storage tank 5 → Second coolant pipeline L7 (cooling pump → V5 open) → Second heat exchange pipeline of heat exchanger 4 → First coolant pipeline L6 → Return to cold storage tank 5.

[0079] Mode 5: The main unit simultaneously supplies cooling and stores cold.

[0080] - Enable component:

[0081] - Valves: Electric valve V1, electric valve V3, electric proportional valve V6

[0082] - Water pumps: chilled water pump, primary chilled water pump, secondary chilled water pump

[0083] - Running path:

[0084] 1. Refrigerant path:

[0085] - Cooling branch: Air conditioning unit 1 → L1 (V1 turns on → chilled water pump 13) → Air conditioning terminal group 2 → L2 → return to air conditioning unit 1.

[0086] - Cold storage branch: Air conditioning unit 1 → L1 → L3 (V3 starts → first cold storage pump 3) → first heat exchange pipeline of heat exchanger 4 → L4 → L2 → return to air conditioning unit 1.

[0087] 2. Coolant path:

[0088] Cold storage tank 5 → First coolant pipeline L6 → Second heat exchange pipeline of heat exchanger 4 → Third coolant pipeline L8 (V6 open → Second cold storage pump) → Return to cold storage tank 5.

[0089] Mode 6: Natural Cooling Mode (for evaporative cooling units only)

[0090] Applicable scenarios: When the ambient temperature is low (such as in winter or transitional seasons) and the room still needs cooling, the natural cooling function of the evaporative cooling unit can be used to significantly reduce energy consumption without starting the compressor.

[0091] - The execution path is exactly the same as in Mode 1:

[0092] 1. Refrigerant path:

[0093] Air conditioning unit 1 → L1 (electric valve V1 opens → chilled water pump 13) → air conditioning terminal group 2 → L2 → return to air conditioning unit 1.

[0094] -Note: When the compressor in the evaporative cooling unit is shut down, a fan is used to introduce natural air to cool the refrigerant flowing through the unit, ensuring the cooling needs of the terminals are met.

[0095] 2. Coolant path:

[0096] The cold storage tank circuit is closed, and there is no flow.

[0097] Final result: By adding a natural cooling mode, the system achieves "zero-compressor cooling" in low-temperature environments, further reducing operating costs and making it suitable for high-cooling-demand scenarios such as data centers and constant-temperature factories.

[0098] In summary, high-efficiency cold storage air conditioning systems have high overall energy-saving efficiency.

[0099] 1) The main unit usually adopts a high-efficiency central air conditioning unit (such as an evaporative cooling chiller), and its COP value is greater than 5.0 under standard operating conditions.

[0100] In summer, the central air conditioning unit operates at night to store cold air, resulting in lower ambient temperatures and higher energy efficiency. Furthermore, the unit operates at full load during cold storage, significantly improving energy efficiency compared to the variable load operation of conventional air conditioners. During the day, when ambient temperatures are higher, the cold storage tank provides cooling, and the air conditioning unit either does not operate or only operates for short periods.

[0101] 2) Water-cooled storage device.

[0102] During off-peak hours, the cooling capacity produced by the central air conditioning unit is stored in a water storage tank. During peak hours, the cooling capacity in the storage tank is released for use in production workshops / offices. By utilizing the price difference between off-peak and peak electricity, the operating costs of air conditioning are significantly reduced. Furthermore, the practice of peak-shifting and valley-filling of electricity usage is strongly supported by national policies.

[0103] In summary, the entire system is highly energy efficient and has low operating costs.

[0104] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0105] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. An indirect high-efficiency cold storage air conditioning system, comprising an air conditioning system, a cold storage device, and a heat exchanger (4); wherein a first heat exchange pipe (41) in the heat exchanger (4) is connected to the refrigerant pipe of the air conditioning system, and a second heat exchange pipe (42) is connected to the coolant pipe of the cold storage device; characterized in that: -The air conditioning system includes an air conditioning unit (1) and an air conditioning terminal group consisting of multiple air conditioning terminals (2) connected in parallel; - The air conditioning unit (1) is connected to the air conditioning terminal group through the first refrigerant line (L1) and the second refrigerant line (L2) to form a loop. The first refrigerant line (L1) is equipped with an electric proportional valve V1 and a refrigeration pump (13) in sequence. - The heat exchanger (4) is connected to the air conditioning unit (1) through the third refrigerant line (L3) and the fourth refrigerant line (L4), wherein: - The third refrigerant line (L3) is connected to the first refrigerant line (L1) between the air conditioning unit (1) and the electric proportional valve (V1). The first cold storage pump (3) and the electric valve V3 are installed on the third refrigerant line (L3) in sequence. - The fourth refrigerant line (L4) is connected to the second refrigerant line (L2); The third refrigerant line (L3) is connected to the first refrigerant line (L1) through the fifth refrigerant line (L5). One end of the fifth refrigerant line (L5) is connected to the first refrigerant line (L1) between the electric proportional valve V1 and the refrigeration pump (13), and the other end is connected to the third refrigerant line (L3) between the first cold storage pump (3) and the heat exchanger (4). An electric proportional valve V2 is installed on the fifth refrigerant line (L5).

2. The indirect high-efficiency cold storage air conditioning system according to claim 1, characterized in that: -The cold storage device includes a cold storage tank (5) for storing cold energy by storing cooling liquid; - The coolant pipeline includes a first coolant pipeline L6 and a second coolant pipeline L7, which are respectively connected to the two ends of the second heat exchange pipeline (42) of the cold storage tank (5) and the heat exchanger (4); - A third coolant line L8 is connected in parallel to the second coolant line L7. A cold release pump (9) and a cold storage pump (10) are respectively installed on the second coolant line L7 and the third coolant line L8.

3. The indirect high-efficiency cold storage air conditioning system according to claim 2, characterized in that: - The second coolant line L7 and the third coolant line L8 are respectively equipped with an electric proportional valve V5 and an electric proportional valve V6.

4. The indirect high-efficiency cold storage air conditioning system according to claim 2, characterized in that: - A float switch (11) for monitoring water level is installed in the cold storage tank (5).

5. The indirect high-efficiency cold storage air conditioning system according to claim 1, characterized in that: - An exhaust valve (12) is installed at the highest point of both the first refrigerant line (L1) and the second refrigerant line (L2).

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