A control method of a large-capacity water storage air conditioning system

Abstract

The present application relates to the technical field of water storage system, especially to a control method of large capacity water storage air conditioning system, by setting first electric valve, second electric valve, third electric valve and fourth electric valve on the pipeline of water storage air conditioning system, the water storage air conditioning system can be under the action of first electric valve, second electric valve, third electric valve and fourth electric valve to carry out cold storage condition, side storage side supply condition, refrigeration host cooling condition, cold storage tank cooling condition, refrigeration host and cold storage tank combined cooling condition, the required equipment, pipeline and valve of water storage air conditioning system are reduced, thereby the cost is reduced, and it is convenient to control, the reliability of system work is improved, and the volume of cold storage water is also increased, thereby the investment is more saved, and the storage capacity is further increased without increasing equipment, thereby the saving result is increased, and the investment willingness of user is further increased.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water storage cooling system, in particular to a control method of large-capacity water storage cooling air conditioning system. BACKGROUND

[0002] Water storage cooling central air conditioner saves electricity for users, balances load for power grid and improves power grid efficiency, and is an energy-saving project that should be vigorously promoted. The current water storage cooling central air conditioning system requires many devices, pipes and valves, resulting in high cost, complex control and low system stability, which reduces the investment willingness of users. Therefore, it is necessary to simplify the water storage cooling system devices, valves and pipelines to reduce investment and facilitate control and improve system reliability. At the same time, under the condition of the same volume of storage tank, further increasing the volume of storage water and enlarging the storage temperature difference will save more investment and increase the investment willingness of users. SUMMARY

[0003] In order to solve the problems in the background art, the present application provides a control method of large-capacity water storage cooling air conditioning system, which has simple structure and can increase the amount of low-temperature water under the condition of using the same volume of storage tank, and also can realize super large temperature difference.

[0004] The technical problem of the present application is solved by the following solution: a control method of large-capacity water storage cooling air conditioning system, comprising a large-capacity water storage cooling air conditioning system, the large-capacity water storage cooling air conditioning system comprising a chilled water main pipe connected with a refrigeration host, a cooling water pump installed on the chilled water main pipe and a storage tank connected with the chilled water main pipe, a plurality of cooling branch pipes connected with the chilled water main pipe, terminal equipment and temperature control devices connected with the cooling branch pipes, and a first electric valve installed on the most unfavorable loop of the plurality of cooling branch pipes;

[0005] The liquid level of the storage tank is higher than the height of the heat exchange coil of the terminal equipment, and the storage tank is a natural stratification type storage structure, the upper and lower water distributors of the 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 return pipe, the upper main pipe is connected with the return pipe and enters the water inlet of the cooling water pump through a second electric valve, the lower main pipe is connected with the return pipe between the second electric valve and the cooling water pump through a third electric valve and is connected with the water supply pipe through a fourth electric valve, the water outlet of the cooling water pump is connected with the water inlet of the refrigeration host, and the chilled water main pipe provides water supply and return for the plurality of cooling branch pipes.

[0006] The water supply pipe and the return pipe of the water outlet of the cooling water pump are connected through an electric switch valve.

[0007] The control method comprises a cold storage condition, a cold storage and supply condition, a refrigeration main machine cooling condition, a cold storage tank cooling condition, a refrigeration main machine and cold storage tank combined cooling condition, and an ultra-large temperature difference refrigeration condition.

[0008] The cold storage condition comprises:

[0009] First, cold storage is performed on the cold storage tank. The first electric valve, the third electric valve, and the electric switch valve are closed, and the second electric valve and the fourth electric valve are opened. The cooling water pump draws high-temperature water in the cold storage tank through the upper header and the second electric valve to enter the refrigeration main machine for refrigeration. After refrigeration, low-temperature water flows back to the cold storage tank through the fourth electric valve and the lower header. This cycle continues until the cold storage tank is full.

[0010] Then, pipeline cold storage is performed. The third electric valve, the fourth electric valve, and the electric switch valve are closed, and the first electric valve and the second electric valve are opened. The cooling water pump is started to draw high-temperature water from the chilled water header and the cooling branch pipes to the refrigeration main machine for refrigeration. After refrigeration, low-temperature water is sent to the cooling branch pipes through the water supply pipe. This cycle continues until the water temperature of the chilled water header and the branch pipes reaches the target cold storage temperature, and the entire cold storage condition ends.

[0011] The cold storage and supply condition comprises:

[0012] In the cold storage condition, a part of the terminal equipment is allowed to be used, and the electric two-way valve or proportional integral valve is partially opened. High-temperature water from the terminal heat exchanger is mixed with high-temperature water in the chilled water header and the cold storage tank, and then enters the refrigeration main machine for circulation refrigeration. When the cold storage tank, the chilled water header, and the cooling branch pipes are full, the entire cold storage and supply condition ends. In the cold storage and supply condition during cold storage of the cold storage tank, the fourth electric valve adjusts the water quantity entering the lower header according to the water quantity returning to the cold storage tank or the water quantity consumed by the terminal equipment. In the cold storage and supply condition during pipeline cold storage, the first electric valve adjusts the water quantity passing through the first electric valve according to the pipeline pressure at both ends of the first electric valve.

[0013] The refrigeration main machine cooling condition comprises:

[0014] Close the first electric valve, the third electric valve, the fourth electric valve and the electric switch valve, open the second electric valve, the cooling water pump opens to supply the high temperature water of the chilled water main to the refrigeration host, the low temperature water from the refrigeration host supplies the terminal equipment through the chilled water main, and the high temperature water after cooling is circulated to the water supply pipe through the return water pipe and the cooling water pump;

[0015] The cold supply condition of the cold storage tank:

[0016] Close the fourth electric valve, the second electric valve and the first electric valve, open the third electric valve and the electric switch valve, and open the cooling water pump to extract the low temperature water at the bottom of the cold storage tank through the lower main pipe and the third electric valve to the water supply pipe, and supply the terminal equipment of the cooling branch pipe with the low temperature water, and the high temperature water after cooling returns to the cold storage tank through the return water pipe and the upper main pipe;

[0017] The combined cooling of the refrigeration host and the cold storage tank: close the first electric valve, the fourth electric valve and the electric switch valve, open the second electric valve and the third electric valve, the cooling water pump opens to extract the water in the return water pipe and the cold storage tank to supply the refrigeration host, and adjust the second electric valve and the third electric valve according to the mixed temperature, the low temperature water after refrigeration of the refrigeration host is supplied to the terminal equipment of the cooling branch pipe, the high temperature water after cooling returns to the return water pipe, and finally flows back to the cold storage tank and enters the refrigeration host through the second electric valve for circulation;

[0018] The super large temperature difference refrigeration condition:

[0019] After the first stage 4℃ cold storage is completed in the cold storage condition or the edge storage and edge supply condition, close the second electric valve, the fourth electric valve and the electric switch valve, open the first electric valve and the third electric valve, open the cooling water pump to extract the low temperature water at the bottom of the cold storage tank which has completed cold storage through the lower main pipe, further supply the refrigeration host for refrigeration at a lower temperature, return to the cold storage tank through the chilled water main, the cooling branch pipe and the upper main pipe, and until the entire cold storage tank is filled with water below 4℃.

[0020] Further, the first electric valve, the second electric valve, the third electric valve and the fourth electric valve are electric regulating valves.

[0021] Further, the temperature control device includes a temperature sensor, an electric control device, an electric two-way valve or a proportional integral valve.

[0022] To sum up, the beneficial effects of the present application are:

[0023] 1、The present application sets the first electric valve, the second electric valve, the third electric valve and the fourth electric valve on the pipeline of the water storage air conditioning system, so that the water storage air conditioning system can store cold in the accumulator and the pipeline under the action of the first electric valve, the second electric valve, the third electric valve and the fourth electric valve, thereby increasing the volume of the stored water, saving investment, increasing the cost savings, and increasing the user's investment willingness.

[0024] 2、The water storage air conditioning system of the present application can perform the cold storage condition, the side storage and supply condition, the refrigeration host cooling condition, the accumulator cooling condition, and the combined cooling condition of the refrigeration host and the accumulator through the first electric valve, the second electric valve, the third electric valve and the fourth electric valve, compared with the prior art, the water storage air conditioning system requires less equipment, pipeline and valve, thereby reducing the cost, facilitating control, and improving the reliability of the system.

[0025] 3、After the cold storage condition or the side storage and supply condition of the water storage air conditioning system of the present application ends, the cooling water pump extracts the low-temperature water of 4℃ that has completed cold storage at the bottom of the accumulator, supplies it to the refrigeration host for further low-temperature refrigeration, and returns it to the accumulator through the upper main pipe to realize super large temperature difference cold storage, which can further enlarge the temperature difference and increase the cold storage capacity without increasing the equipment, thereby increasing the cost savings and further increasing the user's investment willingness.

[0026] The above description is only a summary of the technical solutions of the present application, in order to more clearly understand the technical means of the present application, the content of the specification can be implemented, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 The structure principle diagram of the present embodiment;

[0028] Figure 2 The principle diagram of the accumulator cold storage of the present embodiment;

[0029] Figure 3 The principle diagram of the pipeline cold storage of the present embodiment;

[0030] Figure 4 The principle diagram of the side storage and supply condition of the present embodiment;

[0031] Figure 5 The principle diagram of the refrigeration host cooling condition of the present embodiment;

[0032] Figure 6 The principle diagram for the cooling condition of the cold storage tank of the embodiment;

[0033] Figure 7 The principle diagram for the combined cooling condition of the refrigeration host and the cold storage tank of the embodiment;

[0034] Figure 8 The principle diagram for the super-large temperature difference refrigeration condition of the embodiment.

[0035] In the figure: 10, refrigeration host; 20, chilled water main pipe; 201, water supply pipe; 202, return water pipe; 30, cold water pump; 40, cold storage tank; 401, upper main pipe; 402, lower main pipe; 50, cold supply branch pipe; 60, terminal equipment; 70, temperature control device; 80, first electric valve; 90, second electric valve; 100, third electric valve; 110, fourth electric valve; 120, electric on-off valve. DETAILED DESCRIPTION

[0036] In order to make the content of the present application more easily and clearly understood, the present application is further described below according to specific embodiments and in conjunction with the accompanying drawings.

[0037] It should be noted that the terms "center", "upper", "lower", "front", "back", "left", "right", "inner", "outer" and the like used herein indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise specified, the meaning of "a plurality of" is two or more.

[0038] Unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood through specific circumstances.

[0039] As Figure 1As shown, a large-capacity chilled water storage air conditioning system includes a chilled water main pipe 20 connected with a refrigeration host 10, a chilled water pump 30 installed on the chilled water main pipe 20, and a storage tank 40 connected with the chilled water main pipe 20, wherein the chilled water main pipe 20 is connected with a plurality of chilled water branch pipes 50, and the chilled water branch pipes 50 are connected with terminal equipment 60 and temperature control devices 70, the temperature control devices 70 include temperature sensors, electric controllers, electric two-way valves or proportional integral valves, the temperature sensors detect the ambient temperature, and when the temperature is too high, the electric controllers control the electric two-way valves or proportional integral valves to open, so that the low-temperature water in the chilled water branch pipes 50 is transmitted to the terminal equipment 60 to achieve cooling.

[0040] When the water storage air conditioning system of the embodiment stores cold, the chilled water pump 30 extracts high-temperature water in the storage tank 40 or the chilled water main pipe 20 to the refrigeration host 10, and after being refrigerated by the refrigeration host 10, the water is returned to the chilled water main pipe 20 or the storage tank 40 to complete the storage of cold; when the water storage air conditioning system supplies cold, the chilled water pump 30 extracts low-temperature water in the storage tank 40 or the chilled water main pipe 20 to each chilled water branch pipe 50, and then the temperature control devices 70 transmit the low-temperature water in the chilled water branch pipes 50 to the terminal equipment 60 according to the ambient temperature to achieve cooling.

[0041] A first electric valve 80 is installed on the most unfavorable loop of the chilled water branch pipe 50 of the embodiment, when the water storage air conditioning system stores cold, the first electric valve 80 is closed, so that the chilled water pump 30 only extracts high-temperature water in the storage tank 40 to store cold; after the storage tank 40 completes the storage of cold, the first electric valve 80 is opened, so that the chilled water pump 30 extracts high-temperature water in the chilled water main pipe 20 and the chilled water branch pipe 50 to the refrigeration host 10, to realize the pipe refrigeration of the embodiment, compared with the prior art, the embodiment further increases the volume of the stored water in the case of the same volume of the storage tank 40, improves the refrigeration effect, saves investment, and increases the investment willingness of users.

[0042] As preferred, the chilled water main pipe 20 of the embodiment comprises a water supply pipe 201 and a return water pipe 202, wherein the water supply pipe 201 supplies chilled water to the terminal equipment 60 of each cooling branch for cooling, and the return water pipe 202 returns the high-temperature water after refrigeration to the cold storage tank 40 or the refrigeration main machine 10 for re-refrigeration; the upper and lower water distributors of the cold storage tank 40 of the embodiment are respectively connected with an upper main pipe 401 and a lower main pipe 402, the upper main pipe 401 is connected with the return water pipe 202, and then enters the water inlet of the chilled water pump 30 through the second electric valve 90, the lower main pipe 402 is connected with the return water pipe 202 between the second electric valve 90 and the chilled water pump 30 through the third electric valve 100, and is connected with the water supply pipe 201 through the fourth electric valve 110, the water outlet of the chilled water pump 30 is connected with the water inlet of the refrigeration main machine 10, and the chilled water main pipe 20 supplies water to the cooling branch pipes 50; the water storage air conditioning system designed in the above manner of the embodiment can realize the cold storage condition, the cold storage and supply condition, the refrigeration main machine 10 cooling condition, the cold storage tank 40 cooling condition, the combined cooling condition of the refrigeration main machine 10 and the cold storage tank 40 by respectively opening or closing the first electric valve 80, the second electric valve 90, the third electric valve 100 and the fourth electric valve 110, compared with the prior art, the embodiment reduces the devices, pipes and valves required by the water storage air conditioning system, thereby reducing the cost, facilitating the control and improving the reliability of the system operation.

[0043] Specifically, during the night-time cold storage, the high-temperature water in the cold storage tank 40 is first cold stored, and then the high-temperature water in the chilled water main pipe 20 and the cooling branch pipe 50 is cold stored, so that the cold storage tank 40 and the pipes are filled with low-temperature water, the cold storage water volume of the embodiment is increased, and during the daytime cooling, the low-temperature water in the chilled water main pipe 20 and the cooling branch pipe 50 can be directly supplied to the terminal equipment 60 for cooling, and the time for the chilled water to be supplied from the cold storage tank 40 to the terminal equipment 60 is reduced, thereby accelerating the speed of the first round of cooling each day.

[0044] Further, in order to reduce the power consumption of the chilled water pump 30 during the cold storage of the cold storage tank 40, the water supply pipe 201 and the return water pipe 202 at the water outlet of the chilled water pump 30 are connected through an electrically-controlled switch valve 120, so that when the cold storage tank 40 is cooled, the chilled water pump 30 directly extracts the low-temperature water in the cold storage tank 40 to the water supply pipe 201, and the low-temperature water is directly supplied to each terminal equipment 60 through the water supply pipe 201 for cooling, without passing through the refrigeration main machine 10, thereby reducing the cooling resistance and the power consumption of the chilled water pump 30.

[0045] 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 terminal equipment 60, which can avoid the backflow of water in the terminal equipment 60 to the cold storage tank 40, causing the water shortage of the air conditioning chilled water system and the failure of cooling.

[0046] As Figures 2 to 7 shown, the embodiment also provides a control method of a large-capacity water storage air conditioning system, which is suitable for the water storage air conditioning system described above, and includes a storage condition, a storage-supply condition, a refrigeration main unit 10 cooling condition, a storage tank 40 cooling condition, and a refrigeration main unit 10 and storage tank 40 combined cooling condition. In the storage condition, as shown, the storage tank 40 is first stored, 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 cooling water pump 30 extracts high-temperature water in the storage tank 40 through the upper header 401 and the second electric valve 90 to enter the refrigeration main unit 10 for refrigeration, the low-temperature water after refrigeration is returned to the storage tank 40 through the fourth electric valve 110 and the lower header 402, and the cycle is repeated until the storage tank 40 is full. Figure 2

[0047] Then, pipeline storage is performed, as shown, the third electric valve 100, the fourth electric valve 110, and the electric switch valve 120 are closed, the first electric valve 80 and the second electric valve 90 are opened, the cooling water pump 30 is opened to extract high-temperature water in the chilled water header 20 and the several cooling branch pipes 50 to send to the refrigeration main unit 10 for refrigeration, the low-temperature water after refrigeration is sent to the several cooling branch pipes 50 through the water supply pipe 201, and the cycle is repeated until the water temperature of the chilled water header 20 and the several branch pipes is reduced to the storage target temperature, and the entire storage condition is ended. Figure 3

[0048] The storage-supply condition is shown in the storage condition, a part of the terminal equipment 60 is allowed to be used, the electric two-way valve or the proportional integral valve is partially opened, the high-temperature water returned through the terminal heat exchange is mixed with the high-temperature water in the chilled water header 20 and the storage tank 40 to enter the refrigeration main unit 10 for circulation refrigeration, until the storage tank 40 and the cooling header and the several cooling branch pipes 50 are full, and the entire storage-supply condition is ended. In the storage-supply condition during the storage of the storage tank 40, the fourth electric valve 110 adjusts the water amount entering the lower header 402 according to the water amount returned to the storage tank 40 or the water amount consumed by the terminal equipment 60, and in the storage-supply condition during the pipeline storage, the first electric valve 80 adjusts the water amount passing through the first electric valve 80 according to the pipeline pressure at both ends of the first electric valve 80. Figure 4

[0049] The refrigeration main unit 10 cooling condition is shown in the refrigeration main unit 10 cooling condition, 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 cooling water pump 30 extracts high-temperature water in the storage tank 40 through the upper header 401 and the second electric valve 90 to enter the refrigeration main unit 10 for refrigeration, the low-temperature water after refrigeration is returned to the storage tank 40 through the fourth electric valve 110 and the lower header 402, and the cycle is repeated until the storage tank 40 is full. Figure 5 ​​​As shown, 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 chilled water pump 30 is started to supply the high temperature water in the chilled water main pipe 20 to the refrigeration host 10, the low temperature water from the refrigeration host 10 is supplied to the terminal equipment 60 through the chilled water main pipe 20, the high temperature water after cooling is circulated to the water supply pipe 201 through the return water pipe 202 and the chilled water pump 30;

[0050] The chilled water storage tank 40 cooling condition: as shown in Figure 6 As shown, 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 chilled water pump 30 is started to draw the low temperature water at the bottom of the chilled water storage tank 40 to the water supply pipe 201 through the lower main pipe 402 and the third electric valve 100, and the low temperature water is supplied to the terminal equipment 60 of the cooling branch pipe 50, the high temperature water after cooling is returned to the chilled water storage tank 40 through the return water pipe 202 and the upper main pipe 401.

[0051] The refrigeration host 10 and the chilled water storage tank 40 combined cooling: as shown in Figure 7 As shown, 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 chilled water pump 30 is started to draw the water in the return water pipe 202 and the chilled water storage tank 40 to supply the refrigeration host 10, and the second electric valve 90 and the third electric valve 100 are adjusted according to the mixed temperature, the low temperature water after refrigeration of the refrigeration host 10 is supplied to the terminal equipment 60 of the cooling branch pipe 50, the high temperature water after cooling is returned to the return water pipe 202, and finally flows back to the chilled water storage tank 40 and enters the refrigeration host 10 through the second electric valve 90.

[0052] Through the above-mentioned chilled water storage condition and cooling condition, 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 can realize the chilled water storage and cooling work of the water storage air conditioning system, the structure is simple, easy to install and maintain, and the cooling speed and the volume of the chilled water are improved, the energy saving effect is increased, and the investment willingness of the user is improved.

[0053] The first electric valve 80, the second electric valve 90, the third electric valve 100 and the fourth electric valve 110 of the embodiment are electric regulating valves, so that the water storage air conditioning system can adjust the water flow through the electric regulating valves during the chilled water storage condition, the chilled water storage and cooling condition, the refrigeration host 10 cooling condition, the chilled water storage tank 40 cooling condition and the refrigeration host 10 and the chilled water storage tank 40 combined cooling condition. Figure 8As shown, the embodiment also provides a super large temperature difference refrigeration working condition. The water storage tank 40 and the low temperature water in the pipeline are further refrigerated to below 4℃ by using the above-mentioned water storage air conditioning system, so as to increase the storage temperature difference and the storage capacity. Since the water density is the largest at 4℃, when the water storage tank 40 with the cold and hot water natural stratification structure is used for storage, the water above 4℃ is hot water and the water below 4℃ is cold water. Therefore, when the cold water above 4℃ is stored, the cold water enters from the water distributor below the water storage tank 40, and the water extracted from the water storage tank 40 for refrigeration of the refrigeration host 10 is extracted from the water distributor above the water storage tank 40. When the cold water below 4℃ is stored to further increase the storage temperature difference, the water entering and extracted from the water storage tank 40 is reversed in the upper and lower directions of the water storage tank 40, that is, the water below 4℃ enters from the water distributor above the water storage tank 40, and the water extracted from the water storage tank 40 for further refrigeration of the refrigeration host 10 is extracted from the water distributor below the water storage tank 40. The method comprises the following steps: after the storage working condition or the storage and supply working condition is ended, the second electric valve 90, the fourth electric valve 110 and the electric switch valve 120 are closed, the first electric valve 80 and the third electric valve 100 are opened, and the cold water pump 30 is started to extract the low temperature water at the bottom of the water storage tank 40 through the lower main pipe 402, so as to further refrigerate the refrigeration host 10 to a lower temperature, and the water is returned to the water storage tank 40 through the upper main pipe 401 until the water storage tank 40 is filled with water below 4℃.

[0054] Through the above-mentioned storage method, the water temperature in the water storage tank 40 and the pipeline is gradually reduced to below 4℃, so as to improve the storage capacity of the entire water storage air conditioning system and increase the energy saving effect.

[0055] The embodiment sets 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 on the pipeline of the water storage air conditioning system, so that the water storage air conditioning system can store the water in the water storage tank 40 and the pipeline under the actions 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 the stored water is increased, the storage working condition, the storage and supply working condition, the refrigeration host 10 supply working condition, the water storage tank 40 supply working condition and the combined supply working condition of the refrigeration host 10 and the water storage tank 40 of the water storage air conditioning system are realized, the required equipment, pipeline and valve of the water storage air conditioning system are reduced, the cost is reduced, the control is facilitated, the reliability of the system is improved, the water in the water storage tank 40 and the pipeline can be further refrigerated to below 4℃ in the super large temperature difference refrigeration working condition, the storage capacity of the entire water storage air conditioning system is improved, and the storage effect is improved.

[0056] The above-described embodiments are merely preferred embodiments of the present application, and cannot be used to limit the protection scope of the present application, and any non-essential changes and modifications made by those skilled in the art on the basis of the present application shall fall within the protection scope of the present application.

Claims

1. A control method of a large-capacity water storage air conditioning system, characterized by: The application relates to a large-capacity chilled water storage air conditioning system, which comprises a chilled water main pipe (20) connected with a refrigeration host (10), a chilled water supply pump (30) installed on the chilled water main pipe (20) and a storage tank (40) connected with the chilled water main pipe (20), a plurality of chilled water supply branch pipes (50) are connected with the chilled water main pipe (20), terminal equipment (60) and temperature control devices (70) are connected with the chilled water supply branch pipes (50), and first electric valves (80) are installed on the most unfavorable loops of the chilled water supply branch pipes (50). The liquid level of the storage tank (40) is higher than the height of heat exchange coils of the terminal equipment (60), the storage tank (40) is of a natural stratification type, upper and lower water distributors of the 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 return water pipe (202), the upper main pipe (401) is connected with the return water pipe (202) and enters the water inlet of the chilled water supply pump (30) through a second electric valve (90), the lower main pipe (402) is connected with the return water pipe (202) between the second electric valve (90) and the chilled 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 chilled water supply pump (30) is connected with the water inlet of the refrigeration host (10), and the chilled water main pipe (20) provides water supply and return for the plurality of chilled water supply branch pipes (50). The water supply pipe (201) and the return water pipe (202) of the water outlet of the chilled water supply pump (30) are connected through an electric switch valve (120). The control method comprises a storage condition, an edge storage and supply condition, a refrigeration host (10) cooling condition, a storage tank (40) cooling condition, a refrigeration host (10) and storage tank (40) combined cooling condition and an ultra-large temperature difference refrigeration condition. The storage condition is as follows: First, the storage tank (40) is stored, 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 chilled water supply pump (30) draws high-temperature water in the storage tank (40) through the upper main pipe (401) and the second electric valve (90) to enter the refrigeration host (10) for refrigeration, low-temperature water after refrigeration is returned to the storage tank (40) through the fourth electric valve (110) and the lower main pipe (402), and the cycle is continued until the storage tank (40) is full. Then, the pipeline is cooled, the third electric valve (100), the fourth electric valve (110) and the electric switch valve are closed, the first electric valve (80) and the second electric valve (90) are opened, and the chilled water pump (30) is started to draw high-temperature water from the chilled water main pipe (20) and the several chilled water branch pipes (50) to the refrigeration main unit (10) for refrigeration. After refrigeration, low-temperature water is sent to the several chilled water branch pipes (50) through the water supply pipe (201), and the cycle is repeated until the water temperature of the chilled water main pipe (20) and the several branch pipes is reduced to the target temperature of the cold storage, and the cold storage condition is ended. The condition of storing and supplying at the same time: In the cold storage condition, a part of the terminal equipment (60) is allowed to be used, and the electric two-way valve or the proportional integral valve is partially opened. High-temperature water passing through the terminal heat exchanger returns to the chilled water main pipe (20) and the high-temperature water in the cold storage tank (40), and then enters the refrigeration main unit (10) for circulation refrigeration until the cold storage tank (40), the chilled water main pipe (20) and the several chilled water branch pipes (50) are full. The condition of storing and supplying at the same time is ended. In the condition of storing and supplying at the same time when the cold storage tank (40) is used for cold storage, the fourth electric valve (110) adjusts the water quantity entering the lower main pipe (402) according to the water quantity returning to the cold storage tank (40) or the water quantity consumed by the terminal equipment (60). In the condition of storing and supplying at the same time when the pipeline is used for cold storage, the first electric valve (80) adjusts the water quantity passing through the first electric valve (80) according to the pipeline pressure at both ends of the first electric valve (80). The refrigeration main unit (10) cooling condition: 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, and the chilled water pump (30) is started to supply high-temperature water from the chilled water main pipe (20) to the refrigeration main unit (10). The low-temperature water from the refrigeration main unit (10) is supplied to the terminal equipment (60) through the chilled water main pipe (20), and the high-temperature water after cooling is sent to the refrigeration main unit (10) through the water return pipe (202) and the chilled water pump (30) to the water supply pipe (201). The cold storage tank (40) cooling condition: Close the fourth electric valve (110), the second electric valve (90), the first electric valve (80), open the third electric valve (100) and the electric switch valve, start the cold water pump (30) to draw the low temperature water at the bottom of the cold storage tank (40) through the lower main pipe (402) and the third electric valve (100) to the water supply pipe (201), and supply cold water to the end equipment (60) of the cold supply branch pipe (50) through the water supply pipe (201), and the high temperature water after the cold supply is returned to the cold storage tank (40) through the return water pipe (202) and the upper main pipe (401); The refrigeration main machine (10) and the cold storage tank (40) supply cold water in combination: close the first electric valve (80), the fourth electric valve (110) and the electric switch valve, open the second electric valve (90) and the third electric valve (100), start the cold water pump (30) to draw the water in the return water pipe (202) and the cold storage tank (40) to supply the refrigeration main machine (10), and adjust the second electric valve (90) and the third electric valve (100) according to the mixed temperature, the low temperature water after the refrigeration of the refrigeration main machine (10) is supplied to the end equipment (60) of the cold supply branch pipe (50), the high temperature water after the cold supply is returned to the return water pipe (202), and finally flows back to the cold storage tank (40) and enters the refrigeration main machine (10) through the second electric valve (90) to circulate; The super large temperature difference refrigeration working condition: After the first stage 4℃ cold storage is completed in the cold storage working condition or the edge storage and edge supply working condition, close the second electric valve (90), the fourth electric valve (110) and the electric switch valve, open the first electric valve (80) and the third electric valve (100), start the cold water pump (30) to draw the low temperature water at the bottom of the cold storage tank (40) which has completed cold storage, and further supply the refrigeration main machine (10) to carry out refrigeration at a lower temperature, and return to the cold storage tank (40) through the chilled water main pipe (20), the cold supply branch pipe (50) and the upper main pipe (401), until the entire cold storage tank (40) is filled with water below 4℃.

2. The control method of a large-capacity chilled water storage air conditioning system according to claim 1, characterized by: The first electric valve (80), the second electric valve (90), the third electric valve (100) and the fourth electric valve (110) are electric regulating valves.

3. The control method of a large-capacity chilled water storage air conditioning system according to claim 1, characterized by: The temperature control device (70) comprises a temperature sensor, an electric control device, an electric two-way valve or a proportional integral valve.

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