Ice storage air conditioning system

Abstract

The utility model discloses an ice storage air-conditioning system which comprises a refrigeration host (1), a freezing pump (2), an ice melting pump (3), a heat exchanger (6), an ice storage device (7), an electric valve V1 (4) and an electric valve V2 (5), and is characterized in that an inlet of the refrigeration host (1) is connected with an outlet of the freezing pump (2); an outlet of the refrigeration host (1) is divided into two paths through a branch pipeline, one path is connected with an inlet of the V2 electric valve (5), and the other path is connected with a port A of the ice storage device (7); and an inlet of the freezing pump (2) is connected with a primary side outlet of the heat exchanger (6), an inlet of the ice melting pump (3) and an outlet of the V1 electric valve (4). By optimizing the pipeline layout and arranging the independent ice melting pump, five operation working condition modes of ice-making cold storage, ice melting cold supply, refrigeration cold supply, combined cold supply and ice-making and cold supply can be achieved only through two electric valves. The system structure is simplified, energy consumption and control complexity are reduced, and the system is suitable for commercial and industrial buildings and has remarkable economical efficiency and popularization value.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning system technology, specifically to an ice storage air conditioning system based on dual-valve control. Background Technology

[0002] Ice storage air conditioning systems generate and store ice using off-peak electricity at night, then melt the ice during peak electricity demand periods to provide cooling, thereby reducing operating costs and balancing grid load. Current technologies require at least four electric valves and complex piping combinations (such as upstream and downstream or series-parallel structures for the main unit), resulting in low system efficiency, complex control, and reliance on specialized companies for design, installation, and operation and maintenance. Therefore, there is an urgent need for a simplified and cost-effective ice storage system solution. Utility Model Content

[0003] 1. Purpose of the utility model

[0004] To address the problems of numerous valves, low system efficiency, and complex control in existing technologies, this utility model provides an ice storage air conditioning system based on dual-valve control. By optimizing the pipeline layout and adding an independent ice-melting pump, it achieves efficient switching between five operating conditions.

[0005] 2. Technical Solution

[0006] An ice storage air conditioning system includes a refrigeration unit, a refrigeration pump, an ice-melting pump, a heat exchanger, an ice storage device, and two electric valves (V1, V2), characterized in that:

[0007] The inlet of the refrigeration unit is connected to the outlet of the refrigeration pump via a pipe;

[0008] • The outlet of the refrigeration unit is split into two paths via branch pipes: one path connects to the inlet of the V2 electric valve, and the other path connects to port A of the ice storage device;

[0009] • The inlet of the refrigeration pump is connected to the primary side outlet of the heat exchanger, the inlet of the ice-melting pump, and the outlet of the V1 electric valve; • The outlet of the ice-melting pump is connected to the inlet of the V1 electric valve and port B of the ice storage device;

[0010] • The outlet of the V2 electric valve is connected to the primary inlet of the heat exchanger;

[0011] The ice storage device has a built-in bidirectional flow ice storage coil, with the refrigerant flowing in opposite directions during ice making and ice melting operations.

[0012] Further optimize the plan

[0013] ①The V1 and V2 electric valves have flow regulation and control functions;

[0014] ② Both the refrigeration pump and the ice-melting pump mentioned above are variable frequency water pumps with check valves;

[0015] ③The ice storage device has a built-in ice storage coil to realize the storage and release of cold energy.

[0016] 3. Beneficial effects

[0017] ① Only two electric valves are needed to realize five operating modes: ice making and cold storage, ice melting and cold supply, refrigeration and cold supply, combined cold supply and ice making + cold supply, simplifying the system structure.

[0018] ② Set up an independent ice-melting pump (3) to reduce system energy consumption and control complexity.

[0019] ③ During ice making and ice melting operations, the refrigerant flows in opposite directions in the ice storage device (7), which improves the ice melting efficiency and temperature stability.

[0020] ④ It is suitable for commercial and industrial buildings and has significant economic advantages. Attached Figure Description

[0021] Figure 1 This is a system flowchart of this utility model;

[0022] Figure 2 Flowchart for ice-making and cold storage operation;

[0023] Figure 3 Flowchart for ice melting and cooling operation;

[0024] Figure 4 Flowchart for refrigeration and cooling operation;

[0025] Figure 5 Flowchart for combined cooling system operation;

[0026] Figure 6 This is a flowchart of the ice-making and cooling process.

[0027] Explanation of the labels in the diagram:

[0028] 1-Refrigeration unit, 2-Refrigeration pump, 3-Ice melting pump, 4-V1 electric valve, 5-V2 electric valve, 6-Heat exchanger, 7-Ice storage device. Detailed Implementation

[0029] The above content is combined to form the following ice storage air conditioning system process: ice making and storage, ice melting and cooling, refrigeration and cooling supply, combined cooling supply, and storage + cooling supply. These are five operating conditions. Figure 1 As shown, the equipment status under various operating conditions:

[0030]

[0031] The following describes in detail, with reference to the accompanying drawings, the five operating conditions of this utility model:

[0032] Ice-making and cold storage operation ( Figure 2 )

[0033] The refrigeration unit (1) operates in ice-making mode, the refrigeration pump (2) is turned on, the V1 electric valve (4) is turned on, the V2 electric valve (5) is turned off, and the ice storage device makes ice and stores cold.

[0034] Refrigerant circulation path: refrigeration pump (2) → refrigeration unit (1) → ice storage device (7) (A→B) → V1 electric valve (4) → refrigeration pump (2).

[0035] Ice melting cooling operation ( Figure 3 )

[0036] The ice-melting pump (3) is turned on, the V1 electric valve (4) is closed, the V2 electric valve (5) is turned on, and the ice-melting pump (3) operates at a variable frequency according to the secondary side requirements.

[0037] Refrigerant circulation path: ice melting pump (3) → ice storage device (7) (B→A) → heat exchanger (6) primary side → ice melting pump (3).

[0038] Refrigeration and cooling operation ( Figure 4 )

[0039] The chilled pump (2) operates at a variable frequency according to the secondary side demand, the V1 electric valve (4) is closed, the V2 electric valve (5) is opened, and the refrigeration unit (1) operates in refrigeration mode.

[0040] Refrigerant circulation path: refrigeration pump (2) → refrigeration unit (1) → V2 electric valve (5) → heat exchanger (6) primary side → refrigeration pump (2).

[0041] Combined cooling mode ( Figure 5 )

[0042] The refrigeration unit (1) is running in refrigeration mode, the ice melting pump (3) is running in variable frequency mode, the V1 electric valve (4) is closed, and the V2 electric valve (5) is open.

[0043] The refrigerant is circulated in two separate loops:

[0044] Path 1: Refrigeration pump (2) → Refrigeration unit (1) → Primary side of heat exchanger (6) → Refrigeration pump (2);

[0045] Path 2: Ice melting pump (3) → Ice storage device (7) (B→A) → Primary side of heat exchanger (6) → Ice melting pump (3).

[0046] Main unit priority: During non-peak electricity price periods, the refrigeration unit (1) provides cooling capacity according to the secondary side temperature demand, and the insufficient part is supplemented by the ice storage device (7) melting ice;

[0047] Ice melting priority: During peak electricity price periods, the ice melting pump (3) melts ice to provide cooling according to the cooling demand of the secondary side, and the insufficient part is supplemented by the cooling unit (1).

[0048] Ice making + cooling operation ( Figure 6 )

[0049] The refrigeration unit (1) operates in ice-making mode, and the V1 electric valve (4) and V2 electric valve (5) adjust the opening degree to distribute the refrigerant flow.

[0050] The refrigerant is circulated in two separate loops:

[0051] Cooling path: refrigeration pump (2) → refrigeration unit (1) → V2 electric valve (5) → primary side of heat exchanger (6) → refrigeration pump (2);

[0052] Ice making path: refrigeration pump (2) → refrigeration unit (1) → ice storage device (7) (A→B) → V1 electric valve (4) → refrigeration pump (2).

[0053] The V2 electric valve (5) adjusts the refrigerant flow rate according to the secondary side requirements, and the V1 electric valve (4) adjusts according to the opening degree of the V2 electric valve (5) so that the flow rate of the V1 and V2 valves is the rated flow rate for ice making.

[0054] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model. The protection scope of this utility model is determined by the claims and is not limited by the specific embodiments.

Claims

1. An ice storage air conditioning system, comprising a refrigeration unit (1), a refrigeration pump (2), an ice melting pump (3), a heat exchanger (6), an ice storage device (7), a V1 electric valve (4), and a V2 electric valve (5), characterized in that: ●The inlet of the refrigeration unit (1) is connected to the outlet of the refrigeration pump (2); ●The outlet of the refrigeration unit (1) is divided into two paths through a branch pipe. One path is connected to the inlet of the V2 electric valve (5), and the other path is connected to the A port of the ice storage device (7). ●The inlet of the refrigeration pump (2) is connected to the primary side outlet of the heat exchanger (6), the inlet of the ice melting pump (3), and the outlet of the V1 electric valve (4); ● The outlet of the ice-melting pump (3) is connected to the inlet of the V1 electric valve (4) and the B port of the ice storage device (7); ● The outlet of the V2 electric valve (5) is connected to the primary side inlet of the heat exchanger (6); ●The ice storage device (7) has a built-in bidirectional ice storage coil through which a refrigerant flows, causing the water outside the coil to freeze or melt.

2. The ice storage air conditioning system according to claim 1, characterized in that: The V1 electric valve (4) and V2 electric valve (5) have flow regulation and control functions.

3. The ice storage air conditioning system according to claim 1, characterized in that: The refrigeration pump (2) and the ice-melting pump (3) are variable frequency pumps with check valves.

4. The ice storage air conditioning system according to claim 1, characterized in that: The ice storage device (7) allows refrigerant to flow from port A to port B during ice-making operation and from port B to port A during ice-melting operation.

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