CN204421253U - Internal melt ice-chilling air conditioning system - Google Patents

Abstract

The utility model provides an internal ice-melting ice-storage air-conditioning system, which includes a cooling tower, a single-working-condition ice-making refrigerator, an ice storage tank, a heat exchanger, a refrigeration unit, terminal equipment, valves and a corresponding circulation pump. The utility model aims to use the single-working-condition ice-making refrigerator to replace the low-efficiency double-working-condition refrigerator in the existing ice-storage air-conditioning system. High refrigeration unit and ice storage tank are jointly undertaken, which improves the operating efficiency of the daytime cooling system, reduces the power distribution power of the cooling system, and reduces the operating cost of the cooling system. In addition, the utility model has five operating modes , the control is simpler and more reliable, and has good economic and social benefits.

Description

Internal ice-melting ice storage air-conditioning system

technical field

The utility model relates to the technical field of refrigeration and air conditioning, in particular to an ice-melting ice-storage air-conditioning system.

Background technique

The ice-storage air-conditioning system uses low-valley power at night to make ice and store cold. It melts the ice and cools it during the peak hours of the day. It can cut peaks and fill valleys, balance the load of the power grid, reduce the construction cost of peak-shaving power stations and reduce environmental pollution. Good economic and social benefits.

However, the existing public buildings using ice storage air-conditioning systems all adopt the partial load ice storage method, that is, the ice storage air-conditioning system consists of a double-working condition refrigerator with ice-making and cooling functions, an ice storage device, and a base-load main engine under normal working conditions. In order to apply to the two working conditions of ice making and cooling, the dual-working condition refrigerator can only be used in the ice making working condition when configuring compressors, heat exchangers and other components, resulting in the unit operating performance COP (cooling energy efficiency) during cooling. The ratio) value is much lower than that of the single-cooling refrigeration unit; in addition, the double-working refrigerator needs to exchange heat through a heat exchanger and a refrigerant circulating pump to indirectly supply cold water, resulting in a low COP value of the cooling system and power consumption. Large capacity, high installed power, increased capacity of the power transformation and distribution system, and high operating costs; in addition, during daytime cooling, dual-working condition refrigerators, ice storage devices, and normal-working condition base-load hosts need to be jointly operated. There are many operating modes and the control system is complex.

In addition, there are many forms of ice-storage air-conditioning systems. Among them, the ice-melting ice-storage air-conditioning system in the coil has high ice storage rate, stable temperature for ice-melting cooling, low investment, and simple control. Both are relatively simple and economical, so they are widely used in ice storage air conditioners. If the internal ice-melting ice-storage air-conditioning system is improved to increase its operating efficiency, reduce energy consumption, and simplify control, it will have good economic and social benefits.

Therefore, in order to overcome the shortcomings of low operating efficiency, high energy consumption and complex system control of the existing ice storage air-conditioning system with dual operating conditions, it is urgent to propose an ice storage air-conditioning system with internal ice melting, so as to improve the efficiency of the existing ice storage air-conditioning system. The operating efficiency of the system is improved, its energy consumption is reduced, and the system control is simpler.

Utility model content

The purpose of this utility model is to provide an ice-melting ice-storage air-conditioning system with high operating efficiency, low energy consumption and simple control, so as to overcome the low operating efficiency, high energy consumption and system Control complex disadvantages.

In order to solve the above technical problems, the utility model provides an internal ice-melting ice-storage air-conditioning system, which is characterized in that it includes a cooling water circulation system, a cold storage and cooling system, and an air-conditioning cold water circulation system;

The cooling water circulation system includes a cooling tower, a single-working-condition ice-making refrigerator, a refrigeration unit, a cooling water pump, a first valve, and a second valve; the single-working-condition ice-making refrigerator and the refrigeration unit both include sequentially connected A refrigeration compressor, a condenser, a throttling device and an evaporator; the cooling tower, the condenser of the single-working condition ice-making refrigerator and the condenser of the refrigerating unit are sequentially connected to form a circuit, wherein the single-working condition The condenser of the ice freezer is connected in parallel with the condenser of the refrigerating unit; the cooling water pump is arranged on the main pipe connected to the cooling tower; the first valve and the second valve are respectively arranged in the On the branch pipe connected to the condenser of the ice-making refrigerator and the condenser of the refrigeration unit;

The cold storage system includes a single-working-condition ice-making refrigerator evaporator, a brine circulation pump, and an ice storage tank that are sequentially connected to form a circuit, and also includes a third valve arranged at the single-working-condition ice-making refrigerator evaporator The cooling system includes a heat exchanger, a brine circulation pump and an ice storage tank connected in turn to form a loop, and also includes a fourth valve arranged at the heat exchanger; wherein, the brine circulation pump Set at the entrance of the ice storage tank;

The air-conditioning cold water circulation system includes terminal equipment, refrigerating unit evaporators and heat exchangers connected in sequence to form a circuit, and also includes a chilled water pump arranged on the main pipe after the refrigerating unit evaporator is connected in parallel with the heat exchanger; wherein , the evaporator of the refrigeration unit is connected in parallel with the heat exchanger.

Further, the air-conditioning cold water circulation system further includes a fifth valve disposed at the heat exchanger and a sixth valve disposed at the evaporator of the refrigeration unit.

Further, the single-working-condition ice-making refrigerator and the refrigeration unit share a cooling tower.

Further, when there are two cooling water pumps, they are respectively arranged on branch pipes connected to the condenser of the single-working condition ice-making refrigerator and the condenser of the refrigerating unit.

Further, when there are two chilled water pumps, they are respectively arranged on branch pipes connected to the evaporator of the refrigeration unit and the heat exchanger.

Further, the brine circulation pump is both a cold storage circulation pump and a cooling circulation pump.

Further, the cooling water pump and the chilled water pump are circulation pumps.

Further, the inner ice-melting ice storage tank is a metal serpentine coil ice storage tank.

Further, the valve is an electric two-way valve.

To sum up, the utility model provides an internal ice-melting ice-storage air-conditioning system, which has the following beneficial effects:

First of all, the single-working-condition ice-making freezer is only responsible for ice-making and cooling at night, while the high-efficiency refrigeration unit and the ice storage tank are responsible for cooling during the day, which improves the COP value of the ice storage system for cooling and reduces The distribution power of the refrigeration system is improved, the investment in the power transformation and distribution system is saved, and the energy consumption and cost of operation are reduced;

Secondly, the single-working-condition ice-making freezer and the ice storage tank are only responsible for ice-making and cold storage at night, while the high-efficiency refrigeration unit and the ice storage tank are responsible for cooling during the day, overcoming the existing ice The cold-storage air-conditioning system dual-working condition refrigerator needs to take into account the shortcomings of both ice-making and cooling conditions when configuring compressors, heat exchangers and other components, which improves the COP value of the ice-making refrigerator;

In addition, the ice storage tank and the refrigerating unit are responsible for daytime cooling, which overcomes the need for dual-working-condition refrigerators, ice storage tanks and conventional refrigerating units to jointly operate for cooling during daytime cooling in the existing ice storage air conditioning system The shortcomings of the refrigeration system reduce the energy consumption of the refrigeration system, and the operating equipment and modes are reduced, and the control becomes simpler.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the ice-melting ice-storage air-conditioning system of the embodiment of the utility model;

Fig. 2 is a schematic structural diagram of the cooling water circulation system of the ice-melting ice-storage air-conditioning system shown in Fig. 1;

Fig. 3 is a structural schematic diagram of the cold storage system and the cooling system of the ice-melting ice storage air-conditioning system shown in Fig. 1;

Fig. 4 is a schematic structural diagram of the air-conditioning cold water circulation system of the ice-melting ice-storage air-conditioning system shown in Fig. 1;

Fig. 5 is a schematic diagram of the overall structure of the ice-melting ice-storage air-conditioning system according to the embodiment of the present invention.

Detailed ways

The ice-melting ice-storage air-conditioning system proposed by the utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. According to the following description and claims, the advantages and features of the utility model will be more clear. It should be noted that all the drawings are in very simplified form and use inaccurate scales, which are only used to facilitate and clearly illustrate the purpose of the embodiment of the present utility model.

1 to 5 are embodiments of the present utility model, please refer to FIG. 1 first. As shown in FIG. 1 , the ice-melting ice-storage air-conditioning system provided by the utility model includes a cooling water circulation system 100 , a cold storage system 200 , a cooling system 300 and an air-conditioning cold water circulation system 400 .

Then refer to Fig. 2, Fig. 2 is the structure of the cooling water circulation system 100 of the ice-melting ice-storage air-conditioning system shown in Fig. The water pump P12, the first valve V1 and the second valve V2, wherein the single-working condition ice-making refrigerator 103 includes a refrigeration compressor 103-1, a condenser 103-2, a throttling device 103-3 and an evaporator connected in sequence to form a circuit. Correspondingly, the refrigeration unit 104 includes a refrigeration compressor 104-1, a condenser 104-2, a throttling device 104-3 and an evaporator 104-4 which are sequentially connected to form a circuit. What needs to be explained here is that since the ice-making refrigerator 103 in single-working condition is only responsible for ice-making and cold storage at night, the configuration of its components is different from that of the refrigeration unit 104, so that the ice-making refrigerator 103 in single-working condition is only suitable for ice making As a result, the power distribution of the system is reduced, and the investment in the power transformation and distribution system is reduced.

As shown in Figure 2, the cooling water pipe 101 connects the outlet of the cooling tower 102, the inlet of the condenser 103-2 of the single-working condition ice-making refrigerator 103 and the inlet of the condenser 104-2 of the refrigeration unit 104, and connects the inlet of the cooling tower 102 The inlet, the outlet of the condenser 103-2 of the single working condition ice-making refrigerator 103 are connected with the outlet of the condenser 104-2 of the refrigeration unit 104, wherein the condenser 103-2 and the condenser 104-2 are connected in parallel; at the same time, the cooling water pump P12 Set on the main pipe of the cooling water pipe 101 connected to the cooling tower 102, or as shown in Figure 5, the cooling water pumps P1 and P2 are respectively arranged on the cooling water pipe 101 connected to the condenser 103-2 and the condenser 104-2 In order to ensure that the system can still operate normally when the cooling water pump P1 or P2 is overhauled, of course, multiple cooling water pumps P1 or P2 can be connected in parallel as backup; in addition, the first valve V1 and the second valve V2 are respectively set at On the branch of the cooling water pipe 101 connected to the condenser 103-2 and the condenser 104-2.

Further, as shown in FIGS. 1 and 5 , the ice-making refrigerator 103 and the refrigerating unit 104 share one cooling tower 102 to save power distribution equipment and reduce operating costs.

In this embodiment, the working process of the cooling water circulation system 100 shown in FIG. 2 is as follows: open the first valve V1 and the second valve V2, and the cooling water produced by the cooling tower 102 is transported to the single-working condition ice-making refrigerator by the cooling water pump P12 The condenser 103-2 of 103 and the condenser 104-2 of the refrigeration unit 104 return to the cooling tower 102 to dissipate heat and cool down after the cooling water absorbs heat and heats up.

Referring next to FIG. 3 , FIG. 3 is a structure of the cold storage system 200 and the cooling system 300 of the ice-melting ice storage air-conditioning system shown in FIG. 1 . Among them, the cold storage system 200 includes a single-working-condition ice-making refrigerator evaporator 103-4, a brine circulating pump P3, and an ice storage tank 202 that are sequentially connected to form a circuit through a cold storage pipeline 201. The third valve V3 at 4; in addition, the cooling system 300 includes a heat exchanger 302, a brine circulation pump P3, and an ice storage tank 202 that are sequentially connected through a cooling pipeline 301 to form a loop, and also includes a The fourth valve V4 at the device 302; wherein, the brine circulation pump P3 is arranged at the entrance of the ice storage tank 202. Here, the ice storage tank 202 can adopt a metal serpentine coil ice storage tank, which has a fast cooling speed, and the temperature can basically remain constant during the cooling process, which can improve the stability of the system. However, the utility model does not limit the coil structure of the ice storage tank 202, which can be selected according to needs. In addition, it is better to choose ethylene glycol aqueous solution as the refrigerant in the utility model, or other refrigerants used in the ice-storage coil air-conditioning system, so as to ensure the safe operation of the system.

In this embodiment, the working process of the cold storage system 200 shown in Fig. 3 is as follows: open the third valve V3, and close the fourth valve V4, after the brine passes through the evaporator 103-4 of the ice-making refrigerator 103 in a single working condition to cool down , is transported by the brine circulation pump P3 to the ice storage tank 202 to absorb heat, and returns to the evaporator 103-4 of the single-working condition ice-making refrigerator 103 after heating up, thereby completing the ice-making and cold-storage cycle; the cooling system 300 shown The working process is as follows: open the fourth valve V4 and close the third valve V3. After the refrigerant passes through the heat exchanger 302 to absorb heat and heat up, it is transported by the refrigerant circulation pump P3 to the ice storage tank 202 to release heat and cool down, and then returns to the The heat exchanger 302 absorbs heat, thereby completing the ice-melting and cooling cycle.

Then refer to Fig. 4, Fig. 4 is the structure of the air-conditioning cold water circulation system 400 of the ice-melting ice-storage air-conditioning system shown in Fig. The fifth valve V5 at the heat exchanger 302 and the sixth valve V6 at the evaporator 104-4 of the refrigeration unit 104; wherein, the chilled water pipe 401 connects the outlet of the terminal equipment 402, the inlet of the heat exchanger 302 and the evaporation of the refrigeration unit 104 Connect the inlet of the device 104-4, and connect the inlet of the terminal equipment 402, the outlet of the heat exchanger 302 and the outlet of the evaporator 104-4 of the refrigeration unit 104, and at the same time, the evaporator 104-4 of the refrigeration unit 104 is connected in parallel with the heat exchanger 302; in addition , the air-conditioning cold water circulation system 400 also includes a chilled water pump P45 arranged on the main pipe of the chilled water pipe 401 after the evaporator 104-4 of the refrigeration unit 104 is connected in parallel with the heat exchanger 302, or as shown in Figure 5, the chilled water pumps P4 and P5 are respectively It is installed on the branch pipe of the chilled water pipe 401 connected to the evaporator 104-4 of the refrigeration unit 104 and the heat exchanger 302, so as to ensure that the system can still operate normally when the chilled water pump P4 or P5 is overhauled. Of course, the chilled water pump P4, P5 You can also connect multiple in parallel as a backup.

In this embodiment, the working process of the air-conditioning cold water circulation system 400 shown in FIG. 4 is: open the fifth valve V5 and the sixth valve V6, and the cold water prepared by the refrigeration unit 104 and the heat exchanger 302 is transported to the terminal equipment by the chilled water pump P45 402, return to the refrigeration unit 104 evaporator 104-4 and the heat exchanger 302 after absorbing heat and raising the temperature.

Further, in order to overcome the pressure drop of the circulation system, the cooling water pump P12 and chilled water pump P45 shown in Figure 1, or the cooling water pumps P1, P2 and chilled water pumps P4, P5 shown in Figure 5 are all circulation pumps; wherein, in order to save Energy consumption, all circulating pumps can also be controlled by frequency conversion. In addition, the brine circulation pump P3 is also used as a cold storage circulation pump and a cooling circulation pump, which can simplify system control, further reduce the power distribution of the refrigeration system, and save investment in power transformation and distribution systems. In addition, the valve described in the utility model can be an electric two-way valve because of its good reliability, convenient installation and economy.

Here, based on the internal ice-melting ice-storage air-conditioning system shown in Fig. 1 and Fig. 5, the utility model has independent ice-making and cold-storage, ice-making and cold-storage and refrigerating unit 104 for cooling, ice-melting and cooling combined with refrigerating unit 104 for cooling, independent There are five operation modes of ice melting and cooling and refrigeration unit 104 providing cooling alone. Taking the internal ice-melting ice-storage air-conditioning system shown in FIG. 1 as an example, these five operation modes will be described respectively.

In the independent ice-making and cold-storage mode, the cooling tower 102, the cooling water pump P12, the first valve V1, the single-working condition ice-making refrigerator 103, the third valve V3, and the brine circulating pump P3 are turned on, and the second valve V2, Refrigeration unit 104, terminal equipment 402, chilled water pump P45, fourth valve V4, fifth valve V5 and sixth valve V6. In this mode, the cooling water pump P12 sends cooling water to the condenser 103-2 of the single-working condition ice-making refrigerator 103, and the cooling water absorbs heat and heats up and sends it to the cooling tower 102 for cooling, forming a cooling water cycle and a refrigerant cycle The pump P3 sends the brine to the ice storage tank 202 for ice-making and cold storage. After the brine is heated up, it is sent to the evaporator 103-4 of the single-working-mode ice-making refrigerator 103 for cooling, forming an ice-making and cold storage cycle.

In the cooling mode of ice-making cold storage and refrigeration unit 104, turn on the cooling tower 102, the cooling water pump P12, the first valve V1, the single-working condition ice-making refrigerator 103, the third valve V3, the brine circulation pump P3, and the terminal equipment 402. The chilled water pump P45, the sixth valve V6, the refrigeration unit 104, and the second valve V2, and close the fourth valve V4 and the fifth valve V5. In the ice-making and cold-storage mode, the cooling water pump P12 delivers the cooling water to the condenser 103-2 of the ice-making refrigerator 103 under single-working condition. The refrigerant circulation pump P3 sends the low-temperature brine to the ice storage tank 202 for ice-making and cold storage. After the brine is heated up, it is sent to the evaporator 103-4 of the single-working ice-making refrigerator 103 for cooling, forming an ice-making and cold storage system. Circulation; in the cooling mode of the refrigeration unit, the cooling water pump P12 sends the cooling water to the condenser 104-2 of the refrigeration unit 104, and the cooling water absorbs heat and heats up and sends it to the cooling tower 102 for cooling to form a cooling water cycle. The water pump P45 sends the chilled water to the evaporator 104-4 of the refrigeration unit 104 for cooling, and then sends the chilled water to the terminal equipment 402 for cooling, forming an air-conditioning cooling cycle.

In the joint cooling mode of melting ice and cooling with the refrigeration unit 104, turn on the cooling tower 102, the cooling water pump P12, the second valve V2, the refrigeration unit 104, the terminal equipment 402, the chilled water pump P45, the fourth valve V4, and the fifth valve V5 , the sixth valve V6 and the brine circulation pump P3, and close the first valve V1, the single-working condition ice-making refrigerator 103 and the third valve V3. In the ice melting and cooling mode, the brine circulation pump P3 sends the brine to the ice storage tank 202 for cooling and cooling, and then sends the brine to the heat exchanger 302 for heat exchange and heating, forming a cycle of ice melting and cooling; , in the cooling mode of the refrigeration unit, the cooling water pump P12 transports the cooling water to the condenser 104-2 of the refrigeration unit 104, and the cooling water absorbs heat and heats up and sends it to the cooling tower 102 for cooling, forming a cooling water cycle. Correspondingly, the chilled water pump P45 sends the chilled water to the evaporator 104-4 of the refrigeration unit 104 for cooling, and then sends it to the terminal equipment 402 for cooling, forming an air-conditioning cooling cycle.

In the mode of only melting ice and cooling, turn on the terminal equipment 402, the chilled water pump P45, the fourth valve V4, the fifth valve V5 and the brine circulation pump P3, and turn off the cooling tower 102, the cooling water pump P12, the first valve V1, A single working condition ice-making refrigerator 103 , a third valve V3 , a second valve V2 , a sixth valve V6 and a refrigeration unit 104 . In this mode, the brine circulation pump P3 sends the brine to the ice storage tank 202 for cooling down, and then sends it to the heat exchanger 302 for heat exchange and temperature rise, forming a cycle of ice melting and cooling. At the same time, the chilled water pump P45 The chilled water of the air conditioner is sent to the heat exchanger 302 for heat exchange and cooling, and then sent to the terminal equipment 402 for cooling, forming an ice-melting and cooling cycle.

In the independent cooling mode of the refrigeration unit 104, the cooling tower 102, the cooling water pump P12, the terminal equipment 402, the chilled water pump P45, the refrigeration unit 104, the sixth valve V6 and the second valve V2 are turned on, and the first valve V1 and the simplex valve are closed. Condition ice-making refrigerator 103, third valve V3, brine circulation pump P3, fourth valve V4 and fifth valve V5. In this mode, the cooling water pump P12 sends the cooling water to the condenser 104-2 of the refrigeration unit 104. It is sent to the evaporator 104-4 of the refrigeration unit 104 for cooling, and then sent to the terminal equipment 402 for cooling, forming an air-conditioning and cooling cycle.

In summary, the utility model provides an internal ice-melting ice-storage air-conditioning system: since the ice-making freezer 103 in a single working condition is only responsible for ice-making and cold storage at night, the high-efficiency refrigeration unit 104 and ice storage tank 202 are responsible for daytime ice storage. Cooling, improve the COP value of the ice storage system for cooling, reduce the power distribution power of the refrigeration system, and save the investment in the power transformation and distribution system; When configuring compressors, heat exchangers and other components of the ice freezer, it is necessary to take into account the shortcomings of both ice-making and refrigeration conditions, which improves the COP value of the ice-making freezer; in addition, the utility model also overcomes the existing ice cold storage The air conditioning system needs dual-working condition refrigerators, ice storage tanks and conventional refrigeration units to jointly operate for cooling during daytime cooling, which reduces the energy consumption of the refrigeration system, and the number of operating equipment and modes is reduced, and the control becomes simpler.

The above description is only a description of the preferred embodiments of the present utility model, and is not any limitation to the scope of the present utility model. Any changes and modifications made by those of ordinary skill in the field of the utility model according to the above disclosures all belong to the protection scope of the claims .

Claims (9)

1. An ice-melting ice-storage air-conditioning system is characterized in that: it comprises a cooling water circulation system, a cold storage and cooling system and an air-conditioning cold water circulation system; The cooling water circulation system includes a cooling tower, a single-working-condition ice-making refrigerator, a refrigeration unit, a cooling water pump, a first valve, and a second valve; the single-working-condition ice-making refrigerator and the refrigeration unit both include sequentially connected A refrigeration compressor, a condenser, a throttling device and an evaporator; the cooling tower, the condenser of the single-working condition ice-making refrigerator and the condenser of the refrigerating unit are sequentially connected to form a circuit, wherein the single-working condition The condenser of the ice freezer is connected in parallel with the condenser of the refrigerating unit; the cooling water pump is arranged on the main pipe connected to the cooling tower; the first valve and the second valve are respectively arranged in the On the branch pipe connected to the condenser of the ice-making refrigerator and the condenser of the refrigeration unit; The cold storage system includes a single-working-condition ice-making refrigerator evaporator, a brine circulation pump, and an ice storage tank that are sequentially connected to form a circuit, and also includes a third valve arranged at the single-working-condition ice-making refrigerator evaporator The cooling system includes a heat exchanger, a brine circulation pump and an ice storage tank connected in turn to form a loop, and also includes a fourth valve arranged at the heat exchanger; wherein, the brine circulation pump Set at the entrance of the ice storage tank; The air-conditioning cold water circulation system includes terminal equipment, refrigerating unit evaporators and heat exchangers connected in sequence to form a circuit, and also includes a chilled water pump arranged on the main pipe after the refrigerating unit evaporator is connected in parallel with the heat exchanger; wherein , the evaporator of the refrigeration unit is connected in parallel with the heat exchanger. 2. The ice-melting ice-storage air-conditioning system according to claim 1, characterized in that: the air-conditioning cold water circulation system further comprises a fifth valve arranged at the heat exchanger and a fifth valve at the evaporator of the refrigeration unit. Six valves. 3. The internal ice-melting ice-storage air-conditioning system according to claim 1 or 2, characterized in that: the single-working-condition ice-making refrigerator and the refrigeration unit share a cooling tower. 4. The ice-melting ice-storage air-conditioning system according to claim 3, characterized in that: when there are two cooling water pumps, they are respectively arranged in the condenser of the single-working condition ice-making refrigerator and the refrigeration unit On the branch pipe connected to the condenser. 5. The ice-melting ice-storage air-conditioning system according to claim 4, characterized in that: when there are two chilled water pumps, they are respectively arranged on the branch pipes connected to the evaporator of the refrigeration unit and the heat exchanger . 6. The internal ice-melting ice-storage air-conditioning system according to claim 5, characterized in that: the brine circulation pump is both a cold storage circulation pump and a cooling circulation pump. 7. The ice-melting ice-storage air-conditioning system according to claim 6, characterized in that: the cooling water pump and the freezing water pump are circulation pumps. 8. The internal ice-melting ice-storage air-conditioning system according to claim 7, characterized in that: the internal ice-melting ice storage tank is a metal serpentine coil ice storage tank. 9. The ice-melting ice-storage air-conditioning system according to claim 8, characterized in that: the valve is an electric two-way valve.