CN115523560A

CN115523560A - High-capacity chilled water storage air conditioning system and control method thereof

Info

Publication number: CN115523560A
Application number: CN202211327983.0A
Authority: CN
Inventors: 苏彬诚
Original assignee: SHENZHEN HAIJIYUAN TECHNOLOGY CO LTD
Current assignee: SHENZHEN HAIJIYUAN TECHNOLOGY CO LTD
Priority date: 2022-10-26
Filing date: 2022-10-26
Publication date: 2022-12-27

Abstract

The invention relates to the technical field of chilled water storage systems, in particular to a high-capacity chilled water storage air-conditioning system and a control method thereof.

Description

High-capacity chilled water storage air conditioning system and control method thereof

Technical Field

The invention relates to the technical field of chilled water storage systems, in particular to a high-capacity chilled water storage air conditioning system and a control method thereof.

Background

The water cold accumulation central air conditioner saves the electric charge for users, balances the load for the power grid, improves the efficiency of the power grid, and is an energy-saving project which is supposed to be widely popularized. The equipment, the pipeline and the valve needed by the current chilled water storage central air conditioning system are often many, which results in higher cost, complex control and lower system stability, thus reducing the investment willingness of users. Therefore, it is necessary to simplify the equipment, valves and pipelines of the chilled water storage system, thereby reducing the investment, facilitating the control and improving the reliability of the system operation. Meanwhile, under the condition of the same volume of the cold storage tank, the investment can be saved by further increasing the volume of cold storage water and enlarging the cold storage temperature difference, the cost saving result is increased, and the investment intention of a user is further increased.

Disclosure of Invention

In order to solve the problems in the background art, the invention provides a high-capacity chilled water storage air conditioning system and a control method thereof, which have simple structure, can increase the amount of low-temperature water under the condition of using the same chilled water storage tank, and can realize ultra-large temperature difference.

The technical scheme adopted by the invention for solving the technical problem is as follows: a high-capacity chilled water storage air conditioning system comprises a chilled water main pipe connected with a refrigeration main machine, a cold supply water pump arranged on the chilled water main pipe and a cold storage tank connected with the chilled water main pipe, wherein the chilled water main pipe is connected with a plurality of cold supply branch pipes, the cold supply branch pipes are connected with end equipment and a temperature control device, and the most unfavorable loop of the cold supply branch pipes is provided with a first electric valve;

the upper water distributor and the lower water distributor of the cold storage tank are respectively connected with an upper main pipe and a lower main pipe, the chilled water main pipe comprises a water supply pipe and a water return pipe, the upper main pipe enters the water inlet of the cold water supply pump through a second electric valve after being connected with the water return pipe, the lower main pipe is connected with the water return pipe between the second electric valve and the cold water supply pump through a third electric valve and is connected with the water supply pipe through a fourth electric valve, the water outlet of the cold water supply pump is connected with the water inlet of the refrigeration host, and the chilled water main pipe provides water supply and return water for the cold supply branch pipes.

Further, the first electrically operated valve, the second electrically operated valve, the third electrically operated valve, and the fourth electrically operated valve are set as electrically operated adjustment valves.

Further, the temperature control device comprises a temperature sensor, an electric controller, an electric two-way valve or a proportional-integral valve.

Further, the water supply pipe is connected with the water return pipe of the water outlet of the cold water supply pump through an electric switch valve.

Further, the liquid level height of the cold accumulation tank is higher than the height of the heat exchange coil of the terminal equipment, and the cold accumulation tank is of a natural layered cold accumulation structure.

A control method of a high-capacity chilled water storage air conditioning system is characterized by comprising the following steps: be applicable to foretell large capacity water cold-storage air conditioning system, supply the cold operating mode including cold-storage operating mode, limit hold limit, refrigeration host computer cold supply operating mode, cold-storage jar cold supply operating mode, refrigeration host computer and cold-storage jar jointly, wherein, the cold-storage operating mode:

firstly, cold accumulation is carried out in a cold accumulation tank, the first electric valve, the third electric valve and the electric switch valve are closed, the second electric valve and the fourth electric valve are opened, the cold water supply pump pumps high-temperature water in the cold accumulation tank through the upper main pipe and the second electric valve to enter the refrigeration host machine for refrigeration, and low-temperature water after the refrigeration is finished flows back to the cold accumulation tank through the fourth electric valve and the lower main pipe, and the process is circulated until the cold accumulation tank is full;

then carrying out pipeline cold accumulation, closing the third electric valve, the fourth electric valve and the electric switch valve, opening the first electric valve and the second electric valve, starting the cold water supply pump to pump high-temperature water of the chilled water main pipe and the plurality of cold supply branch pipes to the refrigeration host machine for refrigeration, and sending low-temperature water after refrigeration to the plurality of cold supply branch pipes through the water supply pipe, so that circulation is carried out until the water temperatures of all the chilled water main pipe and the plurality of cold supply branch pipes are reduced to a cold accumulation target temperature, and the whole cold accumulation working condition is finished;

the side storage supplies the operating mode: under the working condition of cold accumulation, the system allows a part of the terminal equipment to be used, the electric two-way valve or the proportional integral valve is partially in an open state, high-temperature water subjected to terminal heat exchange returns to the chilled water main pipe to be mixed with high-temperature water in the cold accumulation tank and then enters the refrigeration host machine for circulating refrigeration, when the cold accumulation tank, the cold supply main pipe and the plurality of cold supply branch pipes are full of water, the whole side-storage side-supply working condition is finished, under the side-storage side-supply working condition when the cold accumulation tank carries out cold accumulation, the fourth electric valve adjusts the water amount entering the lower main pipe according to the water amount returning to the cold accumulation tank or the water amount consumed by the terminal equipment, and under the side-storage side-supply working condition when the pipeline carries out cold accumulation, the first electric valve adjusts the water amount passing through the first electric valve according to the pipeline pressure at the two ends of the first electric valve;

the refrigeration working condition of the refrigeration main machine is as follows: the first electric valve, the third electric valve, the fourth electric valve and the electric switch valve are closed, the second electric valve is opened, the cold water supply pump is started to supply high-temperature water of the chilled water main pipe to the refrigeration main machine, low-temperature water from the refrigeration main machine supplies cold to the terminal equipment through the chilled water main pipe, and the high-temperature water after cold supply enters the refrigeration main machine through the water return pipe and the cold water supply pump and circulates to the water supply pipe;

the cold storage tank supplies cold operating mode: closing the fourth electric valve, the second electric valve and the first electric valve, opening the third electric valve and the electric switch valve, opening the cold water supply pump to pump the low-temperature water at the bottom of the cold storage tank to the water supply pipe through the lower main pipe and the third electric valve, supplying cold to the end equipment of the cold supply branch pipes through the water supply pipe, and returning the high-temperature water after cold supply to the cold storage tank through the water return pipe and the upper main pipe;

the refrigeration host and the cold accumulation tank jointly supply cold: close first electric valve, fourth electric valve the electric switch valve, open second electric valve reaches third electric valve, supply the cold water pump to open the extraction wet return with the water supply in the cold-storage jar refrigeration host computer to according to the temperature regulation after mixing second electric valve reaches third electric valve, the low temperature water after the refrigeration of refrigeration host computer supplies a plurality of again the end equipment of cooling branch pipe, the high temperature water after the cooling is accomplished returns to the wet return, flows back at last cold-storage jar with the process second electric valve gets into the refrigeration host computer circulation.

Further, the refrigeration operating mode further comprises an ultra-large temperature difference refrigeration operating mode: cold-storage operating mode perhaps limit is held the limit and is supplied the operating mode to accomplish after the first stage 4 ℃ cold-storage, close second electric valve fourth electric valve reaches electric switch valve opens first electric valve with third electric valve opens supply the cold water pump to pass through house steward's extraction down the low temperature water of cold-storage tank bottom accomplished the cold-storage, supply again the refrigeration host computer further carries out microthermal refrigeration, warp chilled water house steward, a plurality of supply the cold branch pipe and go up house steward and get back to the cold-storage jar, until whole the cold-storage jar holds full water that is less than 4 ℃.

In summary, the beneficial effects of the invention are as follows:

1. according to the invention, the first electric valve, the second electric valve, the third electric valve and the fourth electric valve are respectively arranged on the pipeline of the chilled water storage air-conditioning system, so that the chilled water storage air-conditioning system can respectively perform chilled water storage of the chilled water storage tank and chilled water storage of the pipeline under the action of the first electric valve, the second electric valve, the third electric valve and the fourth electric valve, and the volume of chilled water is increased, thus the investment is saved, the cost-saving result is increased, and the investment will of a user is promoted.

2. The chilled water storage air conditioning system can perform the cold storage working condition, the cold storage side-supply working condition, the refrigeration host machine cold supply working condition, the cold storage tank cold supply working condition and the refrigeration host machine and cold storage tank combined cold supply working condition through the first electric valve, the second electric valve, the third electric valve and the fourth electric valve.

3. After the cold accumulation working condition or the working condition of simultaneous cold accumulation and simultaneous supply of the water cold accumulation air-conditioning system is finished, the cold water supply pump extracts low-temperature water with 4 ℃ of cold accumulation at the bottom of the cold accumulation tank, supplies the low-temperature water to the refrigeration host machine for further refrigeration at lower temperature, returns to the cold accumulation tank through the upper main pipe to realize super-large temperature difference cold accumulation, can further enlarge temperature difference, and further increases the cold accumulation amount under the condition of not increasing equipment, thereby increasing the cost saving result and further promoting the investment willingness of users.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.

Drawings

FIG. 1 is a schematic diagram of the structure of the present embodiment;

fig. 2 is a schematic diagram of the cold storage tank of the embodiment;

FIG. 3 is a schematic diagram of the duct cold accumulation of the embodiment;

FIG. 4 is a schematic diagram of the working condition of the edge accumulation in the present embodiment;

FIG. 5 is a schematic diagram of the cooling condition of the refrigeration main machine according to the embodiment;

FIG. 6 is a schematic diagram illustrating a cooling condition of the cold accumulation tank according to this embodiment;

FIG. 7 is a schematic diagram of the cooling condition of the refrigeration main unit and the cold accumulation tank in combination according to the embodiment;

fig. 8 is a schematic diagram of the refrigeration condition with ultra-large temperature difference in this embodiment.

In the figure: 10. a refrigeration host machine; 20. freezing a water main pipe; 201. a water supply pipe; 202. a water return pipe; 30. a cold water supply pump; 40. a cold storage tank; 401. an upper header pipe; 402. a lower header pipe; 50. a cold supply branch pipe; 60. a terminal device; 70. a temperature control device; 80. a first electrically operated valve; 90. a second electrically operated valve; 100. a third electrically operated valve; 110. a fourth electrically operated valve; 120. an electric switch valve.

Detailed Description

In order that the manner in which the above recited features of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to embodiments, some of which are illustrated in the appended drawings.

It should be noted that the terms "center", "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc. used herein indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. "plurality" means two or more unless otherwise specified.

Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

As shown in fig. 1, a large-capacity chilled water storage air conditioning system comprises a chilled water main pipe 20 connected with a refrigeration host 10, a cooling water supply pump 30 installed on the chilled water main pipe 20, and a cold storage tank 40 connected with the chilled water main pipe 20, wherein the chilled water main pipe 20 is connected with a plurality of cooling branch pipes 50, the cooling branch pipes 50 are connected with end equipment 60 and a temperature control device 70, the temperature control device 70 comprises a temperature sensor, an electric controller, an electric two-way valve or a proportional integral valve, the temperature sensor detects the ambient temperature, and the electric controller controls the electric two-way valve or the proportional integral method to be opened when detecting that the temperature is too high, so that the low-temperature water of the cooling branch pipes 50 is transmitted to the end equipment 60 to realize cooling.

When the water cold accumulation air-conditioning system of the embodiment accumulates cold, the cold water supply pump 30 pumps high-temperature water in the cold accumulation tank 40 or the chilled water main pipe 20 to the refrigeration host 10, and the high-temperature water is refrigerated by the refrigeration host 10 and then flows back to the chilled water main pipe 20 or the cold accumulation tank 40 to accumulate cold; when the chilled water storage air conditioning system supplies cold, the cold water supply pump 30 pumps the low-temperature water in the cold storage tank 40 or the chilled water main pipe 20 to each cold supply branch pipe 50, and then the temperature control device 70 transfers the low-temperature water in the cold supply branch pipes 50 to the end equipment 60 according to the ambient temperature to realize cold supply.

The worst loop of the cold supply branch pipe 50 of the embodiment is provided with the first electric valve 80, when the chilled water storage air-conditioning system stores cold, the first electric valve 80 is closed, so that the cold supply water pump 30 only pumps high-temperature water in the cold storage tank 40 for cold storage; after cold accumulation is accomplished to cold accumulation jar 40, open first electric valve 80 again, make and supply cold water pump 30 to draw the high temperature water in refrigerated water house steward 20 and the confession cold branch pipe 50 to the refrigeration host computer 10 in, realize the pipeline refrigeration of this embodiment, compare with prior art, this embodiment has further increased the volume of cold accumulation water under the condition of the same cold accumulation jar 40 volume, has improved refrigeration effect to save the investment, promoted user's investment will.

Preferably, the chilled water main 20 of the present embodiment includes a water supply pipe 201 and a water return pipe 202, wherein the water supply pipe 201 supplies chilled water to the end device 60 of each cooling branch for cooling, and the water return pipe 202 returns the cooled high-temperature water to the cold storage tank 40 or the cooling main 10 for cooling again; the upper and lower water distributors of the cold storage tank 40 of this embodiment are respectively connected to an upper header pipe 401 and a lower header pipe 402, the upper header pipe 401 is connected to a water return pipe 202 and then enters the water inlet of the cold water supply pump 30 through the second electric valve 90, the lower header pipe 402 is connected to the water return pipe 202 between the second electric valve 90 and the cold water supply pump 30 through the third electric valve 100 and is connected to the water supply pipe 201 through the fourth electric valve 110, the water outlet of the cold water supply pump 30 is connected to the water inlet of the refrigeration host machine 10, and the chilled water header pipe 20 supplies the cold water to the plurality of cold water supply branch pipes 50; the chilled water storage air conditioning system that above-mentioned mode designed is taken in this embodiment, can be through opening or closing first electric valve 80 respectively, second electric valve 90, the mode of third electric valve 100 and fourth electric valve 110, realize the cold-storage operating mode, limit supplies the operating mode while holding, refrigeration host computer 10 supplies the cold operating mode, hold cold jar 40 supplies the cold operating mode, refrigeration host computer 10 and the cold jar 40 joint cooling operating mode of holding, compare with prior art, this embodiment has reduced the required equipment of chilled water storage air conditioning system, pipeline and valve, thereby the cost is reduced, and be convenient for control, the reliability of system work is improved.

Specifically, during the cold-storage night, carry out the cold-storage to the high temperature water in the cold-storage jar 40 earlier, carry out the cold-storage to the high temperature water in refrigerated water house steward 20 and the cooling branch pipe 50 again, make all fill the low-temperature water in cold-storage jar 40 and the pipeline, the cold-storage water volume of this embodiment has been increased, and when the cooling on daytime, the low-temperature water in refrigerated water house steward 20 and the cooling branch pipe 50 can directly provide and carry out the cooling to terminal equipment 60, the time that the refrigerated water provided to terminal equipment 60 from cold-storage jar 40 has still been reduced, thereby the speed of every day first round of cooling has been accelerated.

Further, in order to reduce the power consumption of the cold water supply pump 30 when the cold storage tank 40 supplies cold, in this embodiment, the water supply pipe 201 is connected to the water return pipe 202 at the water outlet of the cold water supply pump 30 through the electric switch valve 120, so that when the cold storage tank 40 supplies cold, the cold water supply pump 30 directly pumps the low-temperature water in the cold storage tank 40 from the lower main pipe 402 to the water supply pipe 201, the low-temperature water is directly supplied to each terminal device 60 through the water supply pipe 201 to supply cold, and the cold water does not need to pass through the refrigeration host 10, thereby reducing the cold supply resistance, and reducing the power consumption of the cold water supply pump 30.

In addition, the liquid level of the cold storage tank 40 of the embodiment is higher than the height of the heat exchange coil of the end device 60, so that the situation that the water of the end device 60 flows back into the cold storage tank 40 to cause water shortage of the air-conditioning chilled water system and cold supply failure can be avoided.

As shown in fig. 2 to 7, the present embodiment further provides a control method of a large-capacity chilled water storage air conditioning system, which is suitable for the chilled water storage air conditioning system, and includes a cold storage working condition, a simultaneous cold storage and supply working condition, a refrigeration host 10 cold supply working condition, a cold storage tank 40 cold supply working condition, and a refrigeration host 10 and cold storage tank 40 combined cold supply working condition, where the cold storage working condition: as shown in fig. 2, firstly, cold is stored in the cold storage tank 40, the first electric valve 80, the third electric valve 100 and the electric switch valve 120 are closed, the second electric valve 90 and the fourth electric valve 110 are opened, the cold water pump 30 pumps high-temperature water in the cold storage tank 40 through the upper main pipe 401 and the second electric valve 90 to enter the refrigeration host 10 for refrigeration, and low-temperature water after refrigeration is returned to the cold storage tank 40 through the fourth electric valve 110 and the lower main pipe 402, and the process is repeated until the cold storage tank 40 is full;

then, performing pipeline cold accumulation, as shown in fig. 3, closing the third electric valve 100, the fourth electric valve 110 and the electric switch valve 120, opening the first electric valve 80 and the second electric valve 90, starting the cold water supply pump 30 to pump the high-temperature water of the chilled water main pipe 20 and the plurality of cold supply branch pipes 50 to the refrigeration host 10 for refrigeration, and sending the low-temperature water after the refrigeration is completed to the plurality of cold supply branch pipes 50 through the water supply pipe 201, and circulating the process until the water temperatures of all the chilled water main pipe 20 and the plurality of branch pipes are reduced to the target cold accumulation temperature, and ending the whole cold accumulation working condition;

and (3) storing and supplying working conditions: as shown in fig. 4, under the working condition of cold accumulation, the system allows a part of the end devices 60 to be used, the electric two-way valve or the proportional integral valve is partially in an open state, the high-temperature water after heat exchange at the end returns to the chilled water main pipe 20 to be mixed with the high-temperature water in the cold accumulation tank 40, and then enters the refrigeration main machine 10 for circulating refrigeration, until the cold accumulation tank 40, the cold supply main pipe and the plurality of cold supply branch pipes 50 are fully accumulated, the whole working condition of simultaneous supply is finished, under the working condition of simultaneous supply when the cold accumulation tank 40 accumulates cold, the fourth electric valve 110 adjusts the water amount entering the lower main pipe 402 according to the water amount returning to the cold accumulation tank 40 or the water amount consumed by the end devices 60, and under the working condition of simultaneous supply when the pipeline accumulates cold, the first electric valve 80 adjusts the water amount passing through the first electric valve 80 according to the pipe pressure at both ends of the first electric valve 80;

the cooling condition of the cooling main unit 10 is as follows: as shown in fig. 5, the first electric valve 80, the third electric valve 100, the fourth electric valve 110 and the electric switch valve 120 are closed, the second electric valve 90 is opened, the cold water supply pump 30 is opened to supply the high-temperature water of the chilled water main pipe 20 to the refrigeration main unit 10, the low-temperature water from the refrigeration main unit 10 supplies cold to the end device 60 through the chilled water main pipe 20, and the high-temperature water after completing cold supply enters the refrigeration main unit 10 through the water return pipe 202 and the cold water supply pump 30 and circulates to the water supply pipe 201;

cold storage tank 40 cooling condition: as shown in fig. 6, the fourth electric valve 110, the second electric valve 90 and the first electric valve 80 are closed, the third electric valve 100 and the electric switch valve 120 are opened, the cold water supply pump 30 is started to pump the low-temperature water at the bottom of the cold storage tank 40 to the water supply pipe 201 through the lower main pipe 402 and the third electric valve 100, the water supply pipe 201 supplies cold to the end equipment 60 of the plurality of cold supply branch pipes 50, and the high-temperature water after cold supply is returned to the cold storage tank 40 through the water return pipe 202 and the upper main pipe 401;

the refrigeration host 10 and the cold accumulation tank 40 jointly supply cold: as shown in fig. 7, the first electric valve 80, the fourth electric valve 110, and the electric switch valve 120 are closed, the second electric valve 90 and the third electric valve 100 are opened, the cold water supply pump 30 opens to draw water in the water return pipe 202 and the cold storage tank 40 to the refrigeration main unit 10, the second electric valve 90 and the third electric valve 100 are adjusted according to the mixed temperature, the low-temperature water refrigerated by the refrigeration main unit 10 is supplied to the end devices 60 of the plurality of cold supply branch pipes 50, the high-temperature water after the completion of the cold supply returns to the water return pipe 202, and finally flows back to the cold storage tank 40 and enters the refrigeration main unit 10 through the second electric valve 90 to circulate.

Through above-mentioned cold-storage operating mode and cold supply operating mode, make this embodiment only through first electric valve 80, second electric valve 90, third electric valve 100, fourth electric valve 110 and electric switch valve 120 alright realize water cold-storage air conditioning system's cold-storage and cold supply work, the structure is succinct, the installation maintenance of being convenient for to improved the cold supply speed and the volume that holds cold water, increase the economize on expenses achievement, thereby promoted user's investment intention.

The first electric valve 80, the second electric valve 90, the third electric valve 100 and the fourth electric valve 110 of this embodiment are electric control valves, so that the chilled water storage air conditioning system of this embodiment adjusts the circulating water amount through each electric control valve when performing the cold storage working condition, the cold storage working condition while storing, the refrigeration host 10 cold supply working condition, the cold storage tank 40 cold supply working condition, the refrigeration host 10 and the cold storage tank 40 combined cold supply working condition. Furthermore, as shown in fig. 8, the present embodiment further provides a refrigeration condition with an ultra-large temperature difference, and the cold storage air conditioning system using the above-mentioned water cold storage can further refrigerate the low-temperature water in the cold storage tank 40 and the pipeline to make it lower than 4 ℃, so as to enlarge the cold storage temperature difference and increase the cold storage amount. Because the water density at 4 ℃ is the maximum, when the cold accumulation tank 40 adopting the cold and hot water natural layered structure carries out cold accumulation, the cold accumulation water at the temperature above 4 ℃ is hot water and is below the cold water, when the cold water at the temperature above 4 ℃ is accumulated, the cold water enters from the water distributor below the cold accumulation tank 40, and the water pumped out to the refrigeration host 10 for refrigeration is pumped out from the water distributor above the cold accumulation tank 40; when the cold storage temperature difference needs to be further enlarged and cold water below 4 ℃ is stored, the water entering and pumping out the cold storage tank 40 is inverted in the two directions of the cold storage tank 40, the water changed into the water below 4 ℃ enters from the water distributor above the cold storage tank 40, and the water pumped out for further refrigeration of the refrigeration host 10 is pumped out from the water distributor below the cold storage tank 40, and the method comprises the following steps: after cold-storage operating mode or limit hold and supply the operating mode, close second electric valve 90, fourth electric valve 110 and electric switch valve 120, open first electric valve 80 and open with third electric valve 100, open and supply cold water pump 30 and draw the low temperature water that holds cold-storage jar 40 bottom and accomplish the cold-storage through house steward 402 down, supply with refrigeration host computer 10 again and further carry out lower temperature's refrigeration, and get back to cold-storage jar 40 through upper house steward 401, hold up the water that is less than 4 ℃ until whole cold-storage jar 40.

By the cold accumulation method, the water temperature in the cold accumulation tank 40 and the pipeline is gradually reduced to be lower than 4 ℃, so that the cold accumulation amount of the whole water cold accumulation air-conditioning system is increased, and the cost saving effect is improved.

In the embodiment, the first electric valve 80, the second electric valve 90, the third electric valve 100, the fourth electric valve 110 and the electric switch valve 120 are respectively arranged on the pipeline of the chilled water storage air-conditioning system, so that the chilled water storage air-conditioning system can respectively perform chilled water storage and pipeline cold storage of the chilled tank 40 under the action of the first electric valve 80, the second electric valve 90, the third electric valve 100, the fourth electric valve 110 and the electric switch valve 120, the volume of chilled water is increased, and meanwhile, the chilled working condition of the chilled water storage air-conditioning system, the simultaneous chilled and simultaneous supplying working condition, the chilled main machine 10 supplying working condition, the chilled tank 40 supplying working condition and the chilled main machine 10 and the chilled tank 40 combined supplying working condition of the chilled water storage air-conditioning system are realized, and equipment, pipelines and valves required by the chilled water storage air-conditioning system are reduced, thereby reducing the cost, facilitating control and improving the working reliability of the system; in addition, the refrigeration condition with ultra-large temperature difference of the embodiment can further refrigerate the cold storage tank 40 and the low-temperature water in the pipeline to be lower than 4 ℃, so that the cold storage amount of the whole chilled water storage air conditioning system is increased, and the cold storage effect is improved.

The above-mentioned embodiments are only preferred embodiments of the present invention, and the scope of the present invention should not be limited thereby, and any insubstantial changes and modifications made by those skilled in the art based on the present invention are also covered by the scope of the present invention.

Claims

1. A large capacity chilled water storage air conditioning system which characterized in that: the refrigeration system comprises a chilled water main pipe (20) connected with a refrigeration host (10), a cold water supply pump (30) arranged on the chilled water main pipe (20) and a cold accumulation tank (40) connected with the chilled water main pipe (20), wherein the chilled water main pipe (20) is connected with a plurality of cold supply branch pipes (50), the cold supply branch pipes (50) are connected with terminal equipment (60) and a temperature control device (70), and the worst loop of the plurality of cold supply branch pipes (50) is provided with a first electric valve (80);

the upper water distributor and the lower water distributor of the cold storage tank (40) are respectively connected with an upper main pipe (401) and a lower main pipe (402), the chilled water main pipe (20) comprises a water supply pipe (201) and a water return pipe (202), the upper main pipe (401) is connected with the water return pipe (202) and then enters the water inlet of the cold water supply pump (30) through a second electric valve (90), the lower main pipe (402) is connected with the water return pipe (202) between the second electric valve (90) and the cold water supply pump (30) through a third electric valve (100) and is connected with the water supply pipe (201) through a fourth electric valve (110), the water outlet of the cold water supply pump (30) is connected with the water inlet of the refrigeration host (10), and the chilled water main pipe (20) provides supply return water for the cold water supply branch pipes (50).

2. A large capacity chilled water storage air conditioning system according to claim 1, characterized in that: the first electrically operated valve (80), the second electrically operated valve (90), the third electrically operated valve (100), and the fourth electrically operated valve (110) are set as electrically adjustable valves.

3. A large capacity chilled water storage air conditioning system according to claim 1, characterized in that: the temperature control device (70) comprises a temperature sensor, an electric controller, an electric two-way valve or a proportional-integral valve.

4. A large capacity chilled water storage air conditioning system according to claim 1, characterized in that: the water supply pipe (201) is connected with the water return pipe (202) at the water outlet of the cold water supply pump (30) through an electric switch valve (120).

5. A large capacity chilled water storage air conditioning system according to claim 1, characterized in that: the liquid level height of the cold accumulation tank (40) is higher than the height of the heat exchange coil of the terminal equipment (60), and the cold accumulation tank is of a natural layered cold accumulation structure.

6. A control method of a high-capacity chilled water storage air conditioning system is characterized by comprising the following steps: the high-capacity chilled water storage air conditioning system suitable for any one of claims 1 to 5, comprising a cold storage working condition, a working condition of simultaneous storage and supply, a cooling main engine (10) cooling working condition, a cold storage tank (40) cooling working condition, and a cooling main engine (10) and cold storage tank (40) combined cooling working condition, wherein the cold storage working condition is as follows:

firstly, cold accumulation is carried out on a cold accumulation tank (40), the first electric valve (80), the third electric valve (100) and the electric switch valve are closed, the second electric valve (90) and the fourth electric valve (110) are opened, the cold water supply pump (30) pumps high-temperature water in the cold accumulation tank (40) through the upper header pipe (401) and the second electric valve (90) to enter the refrigeration main machine (10) for refrigeration, low-temperature water after refrigeration is finished flows back to the cold accumulation tank (40) through the fourth electric valve (110) and the lower header pipe (402), and the process is circulated until the cold accumulation tank (40) is full;

then, carrying out cold accumulation on the pipeline, closing the third electric valve (100), the fourth electric valve (110) and the electric switch valve, opening the first electric valve (80) and the second electric valve (90), starting the cold water supply pump (30) to pump high-temperature water of the chilled water main pipe (20) and the plurality of cold supply branch pipes (50) to the refrigeration host machine (10) for refrigeration, and sending the low-temperature water after the refrigeration is finished to the plurality of cold supply branch pipes (50) through the water supply pipe (201), so that the circulation is carried out until the water temperatures of all the chilled water main pipe (20) and the plurality of branch pipes are reduced to the cold accumulation target temperature, and the whole cold accumulation working condition is finished;

the limit holds the limit and supplies the operating mode: under the cold accumulation working condition, the system allows a part of the terminal equipment (60) to be used, the electric two-way valve or the proportional integral valve is partially in an open state, high-temperature water subjected to heat exchange at the terminal returns to the chilled water main pipe (20) to be mixed with high-temperature water in the cold accumulation tank (40) and then enters the refrigeration host (10) for circulating refrigeration, when the cold accumulation tank (40), the chilled water main pipe (20) and the plurality of cold supply branch pipes (50) are fully accumulated, the whole side-storage side-supply working condition is finished, under the side-storage side-supply working condition when the cold accumulation tank (40) accumulates cold, the fourth electric valve (110) adjusts the water amount entering the lower main pipe (402) according to the water amount returning to the cold accumulation tank (40) or the water amount consumed by the terminal equipment (60), and under the side-storage side-supply working condition when the pipeline accumulates cold, the first electric valve (80) adjusts the water amount passing through the first electric valve (80) according to the pipeline pressure at the two ends of the first electric valve (80);

the refrigeration working condition of the refrigeration main machine (10) is as follows: the first electric valve (80), the third electric valve (100), the fourth electric valve (110) and the electric switch valve are closed, the second electric valve (90) is opened, the cold water supply pump (30) is started to supply high-temperature water of the chilled water main pipe (20) to the refrigeration host (10), low-temperature water from the refrigeration host (10) supplies cold to the end equipment (60) through the chilled water main pipe (20), and the high-temperature water after cold supply enters the refrigeration host (10) through the water return pipe (202) and the cold water supply pump (30) and circulates to the water supply pipe (201);

the cold storage tank (40) is in a cold supply working condition: closing the fourth electric valve (110), the second electric valve (90) and the first electric valve (80), opening the third electric valve (100) and the electric switch valve, opening the cold water supply pump (30), pumping the low-temperature water at the bottom of the cold storage tank (40) to the water supply pipe (201) through the lower main pipe (402) and the third electric valve (100), supplying cold to the end equipment (60) of the plurality of cold supply branch pipes (50) through the water supply pipe (201), and returning the high-temperature water after cold supply to the cold storage tank (40) through the water return pipe (202) and the upper main pipe (401);

the refrigeration host (10) and the cold accumulation tank (40) jointly supply cold: close first electrically operated valve (80), fourth electrically operated valve (110), the electric switch valve is opened second electrically operated valve (90) and third electrically operated valve (100), supply cold water pump (30) to open the extraction wet return (202) and the water supply in cold storage tank (40) refrigeration host computer (10), and according to the temperature regulation after mixing second electrically operated valve (90) and third electrically operated valve (100), the low temperature water after refrigeration host computer (10) refrigerates supplies a plurality of again supply cold branch pipe (50) end equipment (60), the high temperature water after the completion of the cooling returns to wet return (202), flows back at last cold storage tank (40) and process second electrically operated valve (90) get into refrigeration host computer (10) circulation.

7. The control method of a large capacity chilled water storage air conditioning system according to claim 6, characterized in that: the refrigeration working condition further comprises an ultra-large temperature difference refrigeration working condition: the cold-storage operating mode or limit is held and is supplied the operating mode to accomplish after the first stage 4 ℃ cold-storage of first stage, close second electric valve (90), fourth electric valve (110) and electric switch valve, open first electric valve (80) with third electric valve (100), open supply cold water pump (30) to pass through house steward (402) extract down the low temperature water that cold-storage jar (40) bottom has accomplished the cold-storage, supply again refrigerating host computer (10) further carry out the refrigeration of lower temperature, the warp freezing water house steward (20), a plurality of supply cold branch pipe (50) and last house steward (401) get back to cold-storage jar (40) hold up to whole cold-storage jar (40) hold full water that is less than 4 ℃.