CN202092250U - Cascade type ice storage air conditioning system - Google Patents

Abstract

The utility model discloses a cascade ice-storage air-conditioning system, which includes a centrifugal cooling water system including a centrifugal cooling water circuit and a centrifugal refrigerant circuit, and a dual-working-condition unit system including a dual-working-condition cooling water circuit and a dual-working-condition refrigerant circuit. And the ice storage system including the refrigerant circuit, the first evaporator and the second plate heat exchanger are respectively connected with the shared chilled water pump, water separator, terminal equipment and water collector to form a circulating chilled water loop independently connected, centrifugal The chilled water system and the dual-working condition unit system are connected through the first plate heat exchanger, and the first plate heat exchanger is respectively connected with the second cooling water pump and the chilled water pump to form a chilled water circuit, and the terminal equipment is connected with the air conditioner that needs cooling . The cascade ice cold storage air conditioning system of the utility model has high efficiency and reliable cooling supply, and can efficiently produce ice and store ice in low valleys, saving energy and cost.

Description

Cascade ice storage air conditioning system

technical field

The utility model relates to a cooling system for an air conditioner, in particular to a cascade ice storage air conditioner system.

Background technique

Air conditioning energy saving is an important part of building energy saving. At present, there are three commonly used cooling methods for air conditioners. The first is ice storage alone for cooling, the second is ice storage combined with dual-working condition unit system for cooling, and the third is single-stage or bipolar centrifugal units. For cooling.

Ice storage technology is one of the key technologies for air-conditioning energy saving. It has the characteristics of balancing the grid load, reducing the installed capacity of power plants, shifting peaks and filling valleys, saving energy and reducing emissions, saving air-conditioning system operating costs, and reducing the installed capacity and power distribution capacity of the air-conditioning system.

The conventional ice storage air-conditioning system uses a dual-working-condition unit that can provide two working conditions of air-conditioning and ice-making as a cold source. There are two deficiencies in the ice storage system composed of units with dual working conditions: one is the low efficiency, small amount of ice production and high energy consumption in the ice production mode. Second, the cooling efficiency of the air conditioner is not as high as that of the centrifugal chiller.

The air-conditioning system composed of single-stage or double-stage centrifugal chillers is a widely used air-conditioning system, which has the characteristics of high efficiency, low price, and stable operation. However, there are two deficiencies in the air-conditioning system composed of single-stage or double-stage centrifugal chillers: one is that it cannot make ice and store energy. Second, it is necessary to configure a spare unit to ensure the long-term safe and reliable operation of the system. The initial investment is high and causes idle equipment and waste of resources.

Contents of the invention

The utility model is completed in order to solve the deficiencies in the prior art. The purpose of the utility model is to provide a cooling system that can not only provide efficient and reliable cooling, but also can produce ice and store ice when the power consumption is low, so as to realize high-efficiency ice-making. , A cascade ice storage air conditioning system that effectively saves energy and saves costs.

The cascade ice storage air conditioning system of the present utility model includes a centrifugal cold water system, a double-working condition unit system and an ice cold storage system. The centrifugal cold water system includes a first cooling tower, a first cooling water pump, and a first condenser. The centrifugal cooling water circuit formed and the circulating centrifugal refrigerant circuit formed by the first compressor, the first condenser, the first evaporator, and the first throttling device connected in sequence, the dual-working condition unit system includes the first Two cooling towers, control valves, second cooling water pumps and second condensers form a circulating double-working condition cooling water circuit and the second compressor, second condenser, second evaporator, and second throttling device connected in sequence form The circulating dual-working-condition refrigerant loop, the ice storage system includes a refrigerant water loop that circulates with the second evaporator, control valves, refrigerant pumps, ice storage equipment, and the second plate heat exchanger, and the first evaporator and the second plate heat exchanger respectively form a circulating chilled water circuit independently connected with the shared chilled water pump, control valve, water separator, terminal equipment and water collector. The centrifugal chilled water system and the duplex The unit systems are connected through the first plate heat exchanger, and the first plate heat exchanger is respectively connected with the second cooling water pump, the second condenser, the chilled water pump and the first centrifugal cooling water system through the control valve. The condenser is connected to form a circulating chilled water circuit, and the terminal equipment is connected to the air conditioner that needs cooling.

The cascade ice storage air-conditioning system of the present utility model can also be:

The control valves are electric valves, and the electric valves are all connected to a controller, and the controller controls the opening and closing of each control valve.

The first plate heat exchanger is connected to the second cooling water pump and the second condenser through the thirteenth valve and the fourteenth valve respectively, and the second cooling water pump, the thirteenth valve, the first The plate heat exchanger, the fourteenth valve, the second condenser, the twelfth valve, and the second cooling water pump form a circulating ice-making cooling water circuit, and the first plate heat exchanger is connected with the chilled water pump and the centrifugal The first evaporators of the type cold water system are respectively connected through the fifth valve and the fourth valve, and the chilled water pump, the first valve, the first evaporator, the fourth valve, the first plate heat exchanger and the The chilled water pump forms an ice-making chilled water circuit.

The chilled water pump, the first valve, the first evaporator of the centrifugal chilled water system, the third valve, the water separator, the terminal equipment, the water collector and the chilled water pump connected in sequence form a circulating centrifugal chilled water loop, the chilled water pump, the second valve, the second plate heat exchanger, the water distributor, the terminal equipment, the water collector and the chilled water pump form a circulating dual-mode chilled water loop .

The first cooling tower, the first cooling water pump, the first condenser, and the first cooling tower connected sequentially in the centrifugal cooling water system form a circulating centrifugal cooling water circuit, and the first condensing water circuit connected in sequence The device, the first throttling device, the first evaporator, and the first compressor form a centrifugal chiller to raise the temperature of the cooling water in the cooling water circuit and lower the temperature of the chilled water in the chilled water circuit.

The second cooling tower, the second cooling water pump, the tenth valve, the eleventh valve of the second condenser, and the second cooling tower connected in sequence in the dual-working-condition unit system form a dual-working-condition cooling water loop, including the first The second condenser, the second throttling device, the second evaporator and the second compressor form a dual-working-condition machine host to heat up the cooling water in the dual-working-condition cooling water circuit while cooling down the refrigerant in the refrigerant circuit.

The refrigerant pump, the second evaporator, the sixth valve, the ice storage device, the ninth valve and the refrigerant pump connected in sequence form an ice storage refrigerant water circuit, and the refrigerant pump, the second evaporator, the intermediate valve group, the Eight valves, the second plate heat exchanger, and the refrigerant pump form a double-working-condition ice-storage joint refrigerant-water circuit, and the middle valve group includes the seventh valve branch in parallel and the sixth valve and the ice-storage equipment composed of branches.

The cascade ice-storage air-conditioning system of the utility model includes a centrifugal cold water system, a double-working condition unit system and an ice cold storage system. The centrifugal cold water system includes a first cooling tower, a first cooling water pump, a first condensing The centrifugal cooling water circuit formed by the condenser and the circulating centrifugal refrigerant circuit formed by the first compressor, the first condenser, the first throttling device and the first evaporator connected in sequence, the dual working condition unit system includes The second cooling tower, the control valve, the second cooling water pump and the second condenser form a circulating double-working condition cooling water loop and the second compressor, the second condenser, the second throttling device and the second evaporator are connected in sequence The formed circulating double-working-condition refrigerant circuit, the ice cold storage system includes a refrigerant water circuit circulating with the second evaporator, control valve, refrigerant pump, ice storage equipment and the second plate heat exchanger, and the first evaporator The centrifugal chiller and the second plate heat exchanger respectively form a circulating chilled water circuit independently connected with the shared chilled water pump, control valve, water distributor, terminal equipment and water collector. The centrifugal chilled water system and the dual The working condition unit systems are connected through the first plate heat exchanger, and the first plate heat exchanger is respectively connected to the second cooling water pump, the second condenser, the chilled water pump and the first centrifugal cooling water system through the control valve. A condenser is connected to form a circulating chilled water circuit, and the terminal equipment is connected to an air conditioner that needs cooling. Therefore, compared with the existing technology, the advantage is that in the new project sink, it not only has the advantages of high efficiency and high cooling capacity of the centrifugal chilled water system, but also has the dual working condition system and ice storage After the system is combined, the ice-making and cold storage can save energy and cost when the power consumption is low, and realize efficient ice-making, increase the ice-making capacity of the system, and improve the ice-making efficiency of the system. At the same time, the centrifugal chilled water system, dual working condition unit system and ice storage system can supply cooling independently or in combination, which expands the cooling capacity, mode and scope of the system, and improves the system's ability to cope with load changes. , enhancing the security and reliability of the system. Moreover, the system no longer needs to be equipped with a spare cold source, which reduces the initial investment, avoids idle equipment and waste of resources, and has obvious effects of energy saving and cost saving. When the cascade ice storage air-conditioning device of the present utility model is applied to energy-saving renovation projects or projects where the cooling capacity of the air-conditioning system needs to be expanded, when the original air-conditioning cold source is a single-stage or double-stage centrifugal chiller, only one more The small cooling capacity and dual working condition main engine can achieve the ice production capacity that the large cooling capacity and dual working condition main engine can achieve. It not only improves the ice-making efficiency of the dual-working condition main engine, but also increases the ice-making capacity of the system and expands the cooling range of the system. Moreover, the initial investment of energy-saving renovation is reduced, the engineering quantity of energy-saving renovation is reduced, the ability of the system to cope with load changes is improved, and the safety and reliability of the system are enhanced. The system does not need to be equipped with a backup cold source, which reduces the initial investment and avoids idle equipment and resource waste.

Description of drawings

Fig. 1 is a schematic diagram of the cascade ice storage air conditioning system of the utility model.

Description of figure number

1...the first compressor 2...the first condenser 3...the first throttling device

4...the first evaporator 5...the first cooling tower 6...the first cooling water pump

7...chilled water pump 8...water separator 9...water collector

10...Terminal equipment 11...Second compressor 12...Second condenser

13...Second throttling device 14...Second evaporator 15...Ice storage equipment

16...Second plate heat exchanger 17...Refrigerant pump 18...Second cooling tower

19...second cooling water pump 20...centrifugal chiller 21...dual working condition host

22...First valve 23...Second valve 24...Third valve

25...fourth valve 26...fifth valve 27...sixth valve

28...the seventh valve 29...the eighth valve 30...the ninth valve

31...10th valve 32...11th valve 33...12th valve

34...the thirteenth valve 35...the fourteenth valve 36...the first plate heat exchanger

Detailed ways

The cascade ice-storage air-conditioning system of the present invention and the method for using the cascade ice-storage air-conditioning system to supply air to the air conditioner will be further described in detail below in conjunction with Fig. 1 of the accompanying drawings.

The cascade ice storage air-conditioning system of the present utility model, please refer to Fig. 1, comprises centrifugal chilled water system, dual working condition unit system and ice cold storage system, and described centrifugal chilled water system comprises the first cooling tower 5, the first cooling The centrifugal cooling water circuit formed by the water pump 6, the first condenser 2 and the centrifugal cooling water loop formed by the first compressor 1, the first condenser 2, the first throttling device 3 and the first evaporator 4 connected in sequence Refrigerant circuit, the dual-working-condition unit system includes a dual-working-condition cooling water circuit formed by a second cooling tower 18, a control valve, a second cooling water pump 19 and a second condenser 12, and includes a second compressor connected in sequence 11. The dual working condition refrigerant circuit formed by the second condenser 12, the second throttling device 13 and the second evaporator 14. The ice storage system includes the second evaporator 14, control valve, refrigerant pump 17, ice storage The equipment 15 and the second plate heat exchanger 16 form a circulating refrigerant water circuit, and the first evaporator 4 and the second plate heat exchanger 16 are respectively connected with the shared chilled water pump 7, control valve, water separator 8, terminal The equipment 10 and the water collector 9 form a circulating chilled water circuit that is independently connected, and the centrifugal chilled water system and the dual-working condition unit system are connected through a first plate heat exchanger 36, and the first plate heat exchanger The heater 36 is connected to the second cooling water pump 19, the second condenser 12, and the chilled water pump 7 and the first condenser 2 of the centrifugal chilled water system respectively through control valves to form a circulating chilled water loop. The terminal equipment 10 Connect with the air conditioner that needs cooling. Therefore, compared with the existing technology, the advantage is that in the new project sink, by controlling the opening and closing of the valve, it not only has the advantages of high efficiency and high cooling capacity of the centrifugal chilled water system, but also has The combination of the dual-working condition system and the ice storage system is used to make ice for cold storage during low-peak electricity consumption. The low-valley electricity price is the industrial electricity price during the low-peak electricity consumption, and the high-valley electricity price is the industrial electricity price during the peak electricity consumption. At present, The high valley electricity price is at least four times that of the low valley electricity price. Therefore, the electricity of the very low price low valley electricity price is used for ice making and ice storage, and in the high valley of the high valley electricity price, the heat exchange between the ice and the air conditioner of the terminal equipment 10 can be used. Cooling the air conditioner greatly saves electric energy and costs. The utility model can also realize high-efficiency ice making, increase the ice making capacity of the system, and improve the ice making efficiency of the system. At the same time, the centrifugal chilled water system, dual working condition unit system and ice storage system can supply cooling independently or in combination, which expands the cooling capacity, mode and scope of the system, and improves the system's ability to cope with load changes. , enhancing the security and reliability of the system. Moreover, the system no longer needs to be equipped with a spare cold source, which reduces the initial investment, avoids idle equipment and waste of resources, and has obvious effects of energy saving and cost saving. When the cascade ice storage air conditioner of the present invention is applied to energy-saving renovation projects or projects where the cooling capacity of the air-conditioning system needs to be expanded, when the original air-conditioning cold source is a single-stage or double-stage centrifugal chiller 20, only one additional The main unit 21 with a small cooling capacity and dual working conditions can realize the ice production capacity that the main unit 21 with a large cooling capacity and dual working conditions can achieve. It not only improves the ice-making efficiency of the main engine 21 under dual working conditions, but also increases the ice-making capacity of the system and expands the cooling range of the system. Moreover, the initial investment of energy-saving renovation is reduced, the engineering quantity of energy-saving renovation is reduced, the ability of the system to cope with load changes is improved, and the safety and reliability of the system are enhanced. The system does not need to be equipped with a backup cold source, which reduces the initial investment and avoids idle equipment and resource waste.

Please refer to Figure 1 for the cascade ice storage air-conditioning system of the present utility model. The above-mentioned technical solution may specifically be that the control valves are electric valves, and the electric valves are all connected to a controller, and the controller controls the operation of each control valve. On and off. The advantage of setting electric valves is electric control, which can directly control the opening and closing of each control valve by a single-chip microcomputer or computer chip, and then control the separate or combined cooling and ice-making of centrifugal cold water system, dual-working condition unit system and ice storage system. , Nine working conditions can be realized, the adjustment control is more convenient, and it is easy to operate.

Please refer to Figure 1 for the cascade ice storage air-conditioning system of the present utility model. On the basis of the above technical solution, it can also be: the first plate heat exchanger 36, the second cooling water pump 19 and the second condenser 12 are respectively connected through the thirteenth valve 34 and the fourteenth valve 35, and the second cooling water pump 19, the thirteenth valve 34, the first plate heat exchanger 36, the fourteenth valve 35, and the second condensing water pump connected in sequence 12, the twelfth valve 33, and the second cooling water pump 19 form a circulating ice-making cooling water circuit, and the first plate heat exchanger 36 is connected with the chilled water pump 7 and the first evaporator of the centrifugal cold water system 4 are respectively connected by the fifth valve 26 and the fourth valve 25, the chilled water pump 7, the first valve 22, the first evaporator 4, the fourth valve 25, the first plate heat exchanger 36 and all The chilled water pump 7 forms an ice-making chilled water circuit. Like this, the cooling water in the ice-making cooling water circuit drops in temperature in the first plate heat exchanger 36, and returns to cooling in the second cooling tower 18 after the cooling water temperature in the second condenser 12 rises, and makes The chilled water in the ice chilled water circuit rises in temperature in the first plate heat exchanger 36, passes through the fifth valve 26, enters the chilled water pump 7, enters the first evaporator 4 through the first valve 22, cools down, and then passes through the fourth valve 25 Then enter the first plate heat exchanger 36 for circulation.

For the cascade ice storage air-conditioning system of the present utility model, please refer to Fig. 1. On the basis of the above technical solution, a further preferred solution is: the frozen water pump 7, the first valve 22, the centrifugal cold water system connected in sequence The first evaporator 4, the third valve 24, the water distributor 8, the terminal equipment 10, the water collector 9 and the chilled water pump 7 form a circulating centrifugal chilled water loop, the chilled water pump 7, the second valve 23 , the second plate heat exchanger 16 , the water separator 8 , the terminal equipment 10 , the water collector 9 and the chilled water pump 7 form a circulating double-working-condition chilled water circuit. In this way, the chilled water in the centrifugal chilled water circuit can circulate to supply cooling to the air conditioner connected to the terminal equipment 10 . The chilled water in the dual-working-condition chilled water loop can also be circulated to supply cooling to the air conditioner connected to the terminal equipment 10, realizing the combined cooling of the centrifugal chilled water system and the dual-working-condition unit system.

Please refer to Figure 1 for the cascade ice storage air-conditioning system of the present utility model. On the basis of the above technical solution, the first cooling tower 5 and the first cooling water pump connected sequentially in the centrifugal cold water system may also be: 6. The first condenser 2 and the first cooling tower 5 form a circulating centrifugal cooling water loop, and the first condenser 2, the first throttling device 3, the first evaporator 4, and the The first compressor 1 forms a centrifugal chiller 20 to raise the temperature of the cooling water in the cooling water circuit and lower the temperature of the chilled water in the chilled water circuit. Such a cooling water circuit combined with a centrifugal chilled water circuit can independently supply cooling to the air conditioner connected to the terminal equipment 10 .

Please refer to Figure 1 for the cascade ice storage air-conditioning system of the present utility model. On the basis of the above technical solution, it can also be: the second cooling tower 18, the second cooling water pump 19, The tenth valve 31, the second condenser 12, the eleventh valve 32, and the second cooling tower 18 form a double-working-condition cooling water circuit, including the second condenser 12, the second throttling device 13, and the second evaporator 14 and the second compressor 11 form a dual-working-condition machine. The main unit heats up the cooling water in the dual-working-condition cooling water circuit and cools down the refrigerant in the refrigerant circuit at the same time. In this way, the dual-working-condition cooling water circuit, the refrigerant circuit and the dual-working-condition chilled water circuit are combined into a dual-working-condition unit system to supply cooling to the air conditioner connected to the terminal equipment 10 . A further preferred technical solution is that a second throttling device is provided between the second condenser 12 and the second evaporator 14 . The role of setting the throttling device is throttling, so that the refrigerant heating and cooling efficiency is higher.

Please refer to Figure 1 for the cascade ice-storage air-conditioning system of the present utility model. On the basis of the above-mentioned technical solution, it can also be: a refrigerant pump 17, a second evaporator 14, a sixth valve 27, and an ice-storage device 15 connected in sequence , the ninth valve 30 and the refrigerant pump 17 form an ice-storage refrigerant water circuit, and the refrigerant pump 17, the second evaporator 14, the middle valve group, the eighth valve 29, and the second plate heat exchanger 16, refrigerant The pump 17 forms a double working condition ice storage combined refrigerant water circuit, and the middle valve group includes a parallel branch of the seventh valve 28 and a branch composed of the sixth valve 27 and the ice storage device 15 . In this way, combined with the dual-working-condition chilled water circuit, the ice storage system and the dual-working-condition unit system can be combined to provide cooling for the air conditioner connected to the terminal equipment 10, or the ice storage equipment 15 in the ice storage system can be independently cooled. ice.

The cascade ice-storage air-conditioning equipment of the utility model can have nine working conditions during operation.

The specific nine working conditions are:

(1) High-efficiency ice-making working condition: at this time, the second valve 23 , the third valve 24 , the seventh valve 28 , the eighth valve 29 , the tenth valve 31 , and the eleventh valve 32 are closed. The circulating centrifugal cooling water circuit formed by the first cooling tower 5, the first cooling water pump 6, the first condenser 2, and the first cooling tower 5 operates, so that the temperature of the refrigerant in the first condenser 2 drops, and the centrifugal chiller unit 20 operation, the ice-making chilled water circuit formed by the chilled water pump 7, the first valve 22, the first evaporator 4, the fourth valve 25, the first plate heat exchanger 36, the fifth valve 26 and the chilled water pump 7 connected in sequence The operation causes the temperature of the chilled water in the first evaporator 4 to drop, which in turn causes the temperature of the chilled water in the first plate heat exchanger 36 to rise, and the second cooling water pump 19, the thirteenth valve 34, and the first plate heat exchanger connected in sequence 36. The fourteenth valve 35, the second condenser 12, the twelfth valve 33, and the second cooling water pump 19 form a circulating ice-making cooling water loop to operate so that the temperature of the cooling water in the first plate heat exchanger 36 drops and the second The temperature of the cooling water in the condenser 12 rises, and the main engine 21 operates in dual working conditions, so that the temperature of the refrigerant in the second condenser 12 drops, while the temperature of the refrigerant in the second evaporator 14 rises. At this time, the refrigerant pump 17, the second evaporator 14. The sixth valve 27, the ice storage device 15, the ninth valve 30 and the refrigerant pump 17 form an ice storage refrigerant water circuit, so that the temperature of the refrigerant water in the second evaporator 14 is reduced to minus 5°C, and then Ice is made in the ice equipment 15, and the refrigerant water with a higher temperature enters the refrigerant pump 17 through the ninth valve 30 to circulate. Ice, so the ice-making efficiency is high, and the ice storage when the power consumption is low can make the ice storage more efficient and save energy and electricity costs more effectively.

(2) Ice-making working condition of the main engine 21 under dual working conditions: at this time, close the first valve 22, the second valve 23, the third valve 24, the fourth valve 25, the fifth valve 26, the seventh valve 28, the eighth valve Valve 29 , twelfth valve 33 , thirteenth valve 34 , fourteenth valve 35 . The second cooling tower 18, the second cooling water pump 19, the tenth valve 31, the second condenser 12, the eleventh valve 32 and the second cooling tower 18 that are connected in sequence are operated in a double-working mode cooling water circuit, so that The temperature of the cooling water in the second condenser 12 rises, and the main engine 21 operates in dual working conditions, so that the temperature of the refrigerant in the second condenser 12 drops and the temperature of the refrigerant in the second evaporator 14 rises. The second evaporator 14, the sixth valve 27, the ice storage device 15, the ninth valve 30, and the refrigerant pump 17 form an ice storage refrigerant water loop, so that the temperature of the refrigerant water in the second evaporator 14 is reduced to minus 5°C , and then make ice in the ice storage equipment ¨, and then the refrigerant water with higher temperature enters the refrigerant pump 17 through the ninth valve 30 for circulation. Since the system operates under dual working conditions to make ice, it is used for storage when electricity consumption is low. Ice saves energy and electricity bills.

(3) Ice storage equipment 15 is used for cooling alone: it is formed by sequentially connecting the refrigerant pump 17, the second evaporator 14, the middle valve group, the eighth valve 29, the second plate heat exchanger 16, and the refrigerant pump 17 The double-working condition ice storage united refrigerant water circuit, the middle valve group includes the branch circuit of the seventh valve 28 in parallel and the branch circuit composed of the sixth valve 27 and the ice storage device 15, so that the second evaporator 14 The temperature of the internal refrigerant water is reduced to minus 5°C, and then ice is made in the ice storage device ¨ and the temperature of the refrigerant water in the second plate heat exchanger 16 is very low, so that the freezing water in the second plate heat exchanger 16 The temperature drops, and then the circulating chilled water loop formed by the chilled water pump 7, the second valve 23, the second plate heat exchanger 16, the water separator 8, the terminal equipment 10, the water collector 9 and the chilled water pump 7 connected in sequence will The chilled water with a relatively low temperature is sent to the terminal equipment 10 to supply cooling for the air conditioner. Here, the branch function of the seventh valve 28 is to adjust the flow rate of the refrigerant water.

(4) Independent cooling condition of the centrifugal chilled water system: the first cooling tower 5, the first cooling water pump 6, the first condenser 2 and the first cooling tower 5 connected sequentially in the centrifugal chilled water system form a The circulating centrifugal cooling water circuit, the first condenser 2, the first throttling device 3, the first evaporator 4, and the first compressor 1 connected in sequence form a centrifugal chiller 20, combined with the sequentially connected The chilled water pump 7, the first valve 22, the first evaporator 4 of the centrifugal chilled water system, the third valve 24, the water separator 8, the terminal equipment 10, the water collector 9 and the chilled water pump 7 form a cycle The centrifugal chilled water circuit of cooling tower cooling water and the centrifugal chiller unit 20 heat up the cooling water in the cooling water circuit and reduce the temperature of the chilled water in the chilled water circuit. The air conditioner connected to the terminal equipment 10 passing through provides cooling.

(5) Single cooling condition of the dual working condition unit system: the second cooling tower 18, the second cooling water pump 19, the tenth valve 31, the second condenser 12, the eleventh valve 32, and the second cooling tower 18 are connected in sequence A cooling water circuit with dual working conditions is formed, including the second condenser 12, the second throttling device 13, the second evaporator 14 and the second compressor 11 to form a dual working condition machine host, and the refrigerant pump 17, the second evaporator The refrigerant water loop formed by the device 14, the seventh valve 28, the eighth valve 29, the second plate heat exchanger 16, and the refrigerant pump 17, combined with the chilled water pump 7, the second valve 23, and the second plate heat exchanger The water separator 16, the water separator 8, the terminal equipment 10, the water collector 9 and the chilled water pump 7 form a circulating double-working-condition chilled water circuit. The second cooling tower 18 and the dual-working-mode main engine 21 make the temperature of the cooling water in the second evaporator 14 rise and the temperature of the refrigerant drops, and then the temperature of the refrigerant in the second evaporator 14 rises, while the temperature of the refrigerant water decreases, so that the second plate exchange The temperature of the refrigerant water in the heater 16 rises to lower the temperature of the chilled water, and the chilled water cools the air conditioner connected to the terminal equipment 10 that flows through it.

(6) Combined cooling supply condition of the centrifugal chilled water system and the ice storage system: the first cooling tower 5, the first cooling water pump 6, the first condenser 2 and the first cooling tower connected sequentially in the centrifugal chilled water system The cooling tower 5 forms a circulating centrifugal cooling water circuit, and the first condenser 2, the first throttling device 3, the first evaporator 4, and the first compressor 1 connected in sequence form a centrifugal chiller 20, Combining the chilled water pump 7, the first valve 22, the first evaporator 4 of the centrifugal chilled water system, the third valve 24, the water separator 8, the terminal equipment 10, the water collector 9 and the freezing water pump connected in sequence The water pump 7 forms a circulating centrifugal chilled water circuit, so that the cooling water in the cooling tower and the centrifugal chiller 20 heat up the cooling water in the cooling water circuit and reduce the temperature of the chilled water in the chilled water circuit. The chilled water cools the air conditioner connected to the terminal equipment 10 that flows through it. At the same time, a double working condition ice storage combined refrigerant water circuit formed by the refrigerant pump 17, the second evaporator 14, the middle valve group, the eighth valve 29, the second plate heat exchanger 16 and the refrigerant pump 17 connected in sequence, The middle valve group includes the branch circuit of the seventh valve 28 connected in parallel and the branch circuit composed of the sixth valve 27 and the ice storage device 15, so that the temperature of the refrigerant water in the second evaporator 14 is reduced to minus 5°C, Then ice is made in the ice storage device 15 and the temperature of the refrigerant water in the second plate heat exchanger 16 is very low, and the temperature of the chilled water is reduced in the second plate heat exchanger 16, and then the chilled water pump 7 connected in sequence , the second valve 23 , the second plate heat exchanger 16 , the water separator 8 , the terminal equipment 10 , the water collector 9 and the chilled water pump 7 form a circulating chilled water loop to deliver chilled water with a relatively low temperature to the terminal equipment 10 To provide cooling for the air conditioner, here, the branch function of the seventh valve 28 is to adjust the flow of refrigerant water. The advantage of this working condition is that the centrifugal cold water system and the ice storage device 15 are combined for cooling, which has higher efficiency and effectively saves energy.

(7) Combined cooling condition of the unit system and the ice storage system under dual working conditions: the second cooling tower 18, the second cooling water pump 19, the tenth valve 31, the second condenser 12, the eleventh valve 32, The second cooling tower 18 forms a dual-working-condition cooling water circuit, including the second condenser 12, the second throttling device 13, the second evaporator 14 and the second compressor 11 to form a dual-working-condition main machine, and a refrigerant pump 17. The refrigerant water loop formed by the second evaporator 14, the seventh valve 28, the eighth valve 29, the second plate heat exchanger 16, and the refrigerant pump 17, combined with the chilled water pump 7, the second valve 23, the The second plate heat exchanger 16 , the water distributor 8 , the terminal equipment 10 , the water collector 9 and the chilled water pump 7 form a circulating double-working-condition chilled water loop. The second cooling tower 18 and the dual-working-mode main engine 21 make the temperature of the cooling water in the second evaporator 14 rise and the temperature of the refrigerant drops, and then the temperature of the refrigerant in the second evaporator 14 rises, while the temperature of the refrigerant water decreases, so that the second plate exchange The temperature of the refrigerant water in the heater 16 rises to lower the temperature of the chilled water, and the chilled water cools the air conditioner connected to the terminal equipment 10 that flows through it. At the same time, combined with the dual-working condition ice storage combined refrigerant water circuit formed by the refrigerant pump 17, the second evaporator 14, the middle valve group, the eighth valve 29, the second plate heat exchanger 16, and the refrigerant pump 17 connected in sequence, the The middle valve group includes the branch of the seventh valve 28 in parallel and the branch of the sixth valve 27 and the ice storage device 15, so that the temperature of the refrigerant water in the second evaporator 14 is reduced to minus 5°C, and then Ice is made in the ice storage device 15 and the temperature of the refrigerant water in the second plate heat exchanger 16 is very low, and the temperature of the chilled water is lowered in the second plate heat exchanger 16, and then the chilled water pump 7, which is connected in sequence, The circulating chilled water loop formed by the second valve 23, the second plate heat exchanger 16, the water separator 8, the terminal equipment 10, the water collector 9 and the chilled water pump 7 delivers the chilled water with a relatively low temperature to the terminal equipment 10 to the The air conditioner provides cooling. Here, the branch function of the seventh valve 28 is to adjust the flow of refrigerant water. In this way, the dual working condition unit system and the ice storage system will be combined for cooling, effectively saving energy and electricity.

(8), combined cooling of the centrifugal chilled water system and the dual-working unit system: the first cooling tower 5, the first cooling water pump 6, the first condenser 2 and the first cooling tower connected in sequence in the centrifugal chilled water system The cooling tower 5 forms a circulating centrifugal cooling water circuit, and the first condenser 2, the first throttling device 3, the first evaporator 4, and the first compressor 1 connected in sequence form a centrifugal chiller 20, Combining the chilled water pump 7, the first valve 22, the first evaporator 4 of the centrifugal chilled water system, the third valve 24, the water separator 8, the terminal equipment 10, the water collector 9 and the freezing water pump connected in sequence The water pump 7 forms a circulating centrifugal chilled water circuit, so that the cooling water in the cooling tower and the centrifugal chiller 20 heat up the cooling water in the cooling water circuit and reduce the temperature of the chilled water in the chilled water circuit. The chilled water cools the air conditioner connected to the terminal equipment 10 that flows through it. Simultaneously open the cooling of the double-working condition unit system, that is, the second cooling tower 18, the second cooling water pump 19, the tenth valve 31, the second condenser 12, the eleventh valve 32, and the second cooling tower 18 are connected in sequence to form a double cooling tower. The working condition cooling water circuit includes the second condenser 12, the second throttling device 13, the second evaporator 14 and the second compressor 11 to form a dual working condition machine host, and the refrigerant pump 17, the second evaporator 14 , the seventh valve 28, the eighth valve 29 and the second plate heat exchanger 16, the refrigerant water circuit formed by the refrigerant pump 17, combined with the chilled water pump 7, the second valve 23, the second plate heat exchanger 16 , the water separator 8 , the terminal equipment 10 , the water collector 9 and the chilled water pump 7 form a circulating double-working-condition chilled water loop. The second cooling tower 18 and the dual-working-mode main engine 21 make the temperature of the cooling water in the second evaporator 14 rise and the temperature of the refrigerant drops, and then the temperature of the refrigerant in the second evaporator 14 rises, while the temperature of the refrigerant water decreases, so that the second plate exchange The temperature of the refrigerant water in the heater 16 rises to lower the temperature of the chilled water, and the chilled water cools the air conditioner connected to the terminal equipment 10 that flows through it. In this way, the centrifugal chiller system and the double working condition unit system can be combined for cooling, that is, efficient and reliable cooling can be provided, and there is no need to equip a spare unit to reduce costs.

(9) Cooling by the centrifugal chilled water system, the dual working condition unit system and the ice storage system: the first cooling tower 5, the first cooling water pump 6, and the first condenser 2 connected sequentially in the centrifugal chilled water system Form a circulating centrifugal cooling water loop with the first cooling tower 5, the first condenser 2, the first throttling device 3, the first evaporator 4, and the first compressor 1 connected in sequence form a centrifugal Type chiller 20, combined with the chilled water pump 7, the first valve 22, the first evaporator 4 of the centrifugal chilled water system, the third valve 24, the water separator 8, the terminal equipment 10, and the water collector connected in sequence 9 and the chilled water pump 7 form a circulating centrifugal chilled water circuit, so that the cooling water in the cooling tower and the centrifugal chiller 20 heat up the cooling water in the cooling water circuit and reduce the temperature of the chilled water in the chilled water circuit The low-temperature chilled water cools the air conditioner connected to the terminal equipment 10 that flows through it. Simultaneously start the cooling of the dual-working condition unit system, that is, the second cooling tower 18, the second cooling water pump 19, the tenth valve 31, the second condenser 12, the eleventh valve 32, and the second cooling tower 18 are connected in sequence to form The dual-working-condition cooling water circuit includes the second condenser 12, the second throttling device 13, the second evaporator 14 and the second compressor 11 to form a dual-working-condition main engine, and the refrigerant pump 17 and the second evaporator 14. The refrigerant water circuit formed by the seventh valve 28, the eighth valve 29, the second plate heat exchanger 16, and the refrigerant pump 17, combined with the chilled water pump 7, the second valve 23, and the second plate heat exchanger 16. The water separator 8, the terminal equipment 10, the water collector 9 and the chilled water pump 7 form a circulating dual-working-condition chilled water loop. The second cooling tower 18 and the dual-working-mode main engine 21 make the temperature of the cooling water in the second evaporator 14 rise and the temperature of the refrigerant drops, and then the temperature of the refrigerant in the second evaporator 14 rises, while the temperature of the refrigerant water decreases, so that the second plate exchange The temperature of the refrigerant water in the heater 16 rises to lower the temperature of the chilled water, and the chilled water cools the air conditioner connected to the terminal equipment 10 that flows through it. At the same time, the cooling of the ice storage system is also carried out, that is, the duplex formed by the sequentially connected refrigerant pump 17, the second evaporator 14, the middle valve group, the eighth valve 29, the second plate heat exchanger 16, and the refrigerant pump 17. In the case of ice storage joint refrigerant water circuit, the intermediate valve group includes a parallel branch of the seventh valve 28 and a branch composed of the sixth valve 27 and the ice storage device 15, so that the refrigerant water in the second evaporator 14 The temperature is lowered to minus 5°C, then ice is made in the ice storage device 15 and the temperature of the refrigerant water in the second plate heat exchanger 16 is very low, and the temperature of the frozen water in the second plate heat exchanger 16 is reduced, The chilled water circuit of the cycle formed by the chilled water pump 7, the second valve 23, the second plate heat exchanger 16, the water separator 8, the terminal equipment 10, the water collector 9 and the chilled water pump 7 connected in sequence will have a lower temperature. The chilled water is sent to the terminal equipment 10 to supply cooling for the air conditioner. Here, the branch function of the seventh valve 28 is to adjust the flow rate of the refrigerant water. In this way, during the peak period of electricity consumption, if the required cooling capacity is very large, the three cooling systems can be activated to supply cooling at the same time, which saves part of the electricity bill, and can provide sufficient cooling capacity efficiently and reliably, expanding the cooling range of the system. It also improves the ability of the system to cope with load changes.

The above only illustrates several specific embodiments of the present utility model, but it cannot be regarded as the protection scope of the present utility model. All equivalent changes or modifications made according to the design spirit of the present utility model or proportional enlargement or reduction, etc. , all should be considered as falling into the protection scope of the present utility model.

Claims (7)

1. The cascade ice storage air conditioning system is characterized in that it includes a centrifugal chilled water system, a dual-working condition unit system and an ice cold storage system, and the centrifugal chilled water system includes a first cooling tower, a first cooling water pump, a first The centrifugal cooling water circuit formed by the condenser and the circulating centrifugal refrigerant circuit formed by the first compressor, the first condenser, the first evaporator, and the first throttling device connected in sequence, the dual working condition unit system includes A dual-working-condition cooling water circuit formed by the second cooling tower, a control valve, a second cooling water pump and a second condenser, and a second compressor, a second condenser, a second evaporator, and a second throttle connected in sequence The circulating dual-working-condition refrigerant circuit formed by the device, the ice cold storage system includes a refrigerant water circuit circulating with the second evaporator, control valve, refrigerant pump, ice storage equipment and the second plate heat exchanger, the first The evaporator and the second plate heat exchanger respectively form a circulating chilled water circuit independently connected with the shared chilled water pump, control valve, water separator, terminal equipment and water collector. The centrifugal chilled water system and the The double-working condition unit systems are connected through the first plate heat exchanger, and the first plate heat exchanger is respectively connected to the second cooling water pump, the second condenser, the chilled water pump and the centrifugal chilled water system through the control valve. The first condenser is connected to form a circulating chilled water circuit, and the terminal equipment is connected to an air conditioner that needs cooling. 2. The cascade ice-storage air-conditioning system according to claim 1, characterized in that: the control valves are electric valves, and the electric valves are all connected to a controller, and the controller controls the opening and closing of each control valve. closure. 3. The cascade ice-storage air-conditioning system according to claim 1, characterized in that: the first plate heat exchanger, the second cooling water pump and the second condenser pass through the thirteenth valve and the second condenser respectively. The fourteenth valve is connected, and the second cooling water pump, the thirteenth valve, the first plate heat exchanger, the fourteenth valve, the second condenser, the twelfth valve, and the second cooling water pump are connected in sequence to form a cycle of ice making In the cooling water circuit, the first plate heat exchanger is connected to the chilled water pump and the first evaporator of the centrifugal chilled water system respectively through the fifth valve and the fourth valve, and the chilled water pump, The first valve, the first evaporator, the fourth valve, the first plate heat exchanger and the chilled water pump form an ice-making chilled water loop. 4. The cascade ice-storage air-conditioning system according to claim 1, 2 or 3, characterized in that: the chilled water pump, the first valve, the first evaporator, and the first valve of the centrifugal cold water system are sequentially connected. Three valves, a water separator, terminal equipment, a water collector and the chilled water pump form a circulating centrifugal chilled water loop, the chilled water pump, the second valve, the second plate heat exchanger, and the water divider , the terminal equipment, the water collector and the chilled water pump form a circulating double-working-condition chilled water circuit. 5. The cascade ice-storage air-conditioning system according to claim 4, characterized in that: the first cooling tower, the first cooling water pump, the first condenser and the The first cooling tower forms a circulating centrifugal cooling water circuit, and the first condenser, the first throttling device, the first evaporator, and the first compressor connected in sequence form a centrifugal chiller for the cooling water The cooling water in the circuit warms up and lowers the temperature of the chilled water in the chilled water circuit. 6. The cascade ice-storage air-conditioning system according to claim 4, characterized in that: the second cooling tower, the second cooling water pump, the tenth valve, and the second condenser are sequentially connected in the dual-working mode unit system The eleventh valve and the second cooling tower form a dual-working-condition cooling water circuit, including the second condenser, the second throttling device, the second evaporator and the second compressor to form a dual-working-condition machine host to the dual-working condition In working condition, the cooling water in the cooling water circuit heats up and cools down the refrigerant in the refrigerant circuit at the same time. 7. The cascade ice-storage air-conditioning system according to claim 4, characterized in that: the refrigerant pump, the second evaporator, the sixth valve, the ice storage device, the ninth valve and the refrigerant pump connected in sequence form an accumulator The ice-cooling medium-water circuit, the double-working condition ice-storage combined refrigerant-water circuit formed by the refrigerant pump, the second evaporator, the intermediate valve group, the eighth valve, the second plate heat exchanger, and the refrigerant pump in sequence, the intermediate valve The group includes the seventh valve branch circuit and the branch circuit composed of the sixth valve and the ice storage device connected in parallel.