TW202113281A - Phase-change cold storage emergency cold supply system - Google Patents

Abstract

The invention provides a phase-change cold storage emergency cold supply system which includes an air-conditioning refrigeration main unit, a main water pump, an air-conditioning terminal, a plate type heat exchanger, a PCM cold storage tank, a sub-water pump, a main pipeline and an electric valve. By means of the phase-change cold storage emergency cold supply system, at night when the power load is relatively low, that is at the power using low-ebb period, the air-conditioning main unit runs to achieve refrigeration and energy storage, and the cold capacity is stored; in the daytime when the power load is high, that is at the electricity use peak period, the stored cold capacity is released to meet the requirement of the air-conditioning load of a building, and peak shifting and valley filling of the power load are realized; with the cooperation of a PCM cold storage tank, the air-conditioning refrigeration main unit runs at night, and the average cooling temperature is 32 DEG C; when the same cold capacity is produced, the energy consumption of an air-conditioning refrigerator can be reduced by 3% when the cooling temperature is decreased by 1 DEG C, the energy consumption can be reduced by about 15%; and the air-conditioning refrigeration main unit can run for a long time at the high efficiency point, so that about 20% or more of energy can be saved compared with a common system.

Description

Phase change cold storage emergency cooling system

The invention belongs to the technical field of cooling systems, and in particular relates to a phase change cold storage emergency cooling system.

With the rapid development of China’s economy, the demand for electricity is also growing very rapidly, especially as the gap between peak and trough power consumption continues to widen within a day, and the unevenness of grid operation is becoming more and more serious. During peak power consumption, power generation and transmission equipment are serious. Overloading, the Ministry of Electric Power can only cut off the power to ensure the safety of the grid, which affects the use of users. In addition, it has to invest a lot of money to build power stations to meet the power supply; when the power is low, the production capacity of power generation and transmission equipment is serious. Excess and waste, resulting in low grid operation efficiency, and rising costs. Because electricity has the characteristics of generating, transmitting, distributing and using at the same instant, that is, the inherent characteristic that electricity cannot be stored in large quantities, there is excess power generation during the day and night. The phenomenon of waste that cannot be stored; China’s electricity distribution is very uneven, some areas have sufficient electricity, some areas have poor electricity, large cities and industrial areas have insufficient electricity during the day, and excess electricity at night; as long as the electricity energy is fully and reasonably used, the country will Benefit, users will also benefit, the higher the electricity usage rate.

In the 1970s, taking the world-wide energy crisis as an opportunity, some developed countries successively introduced some advanced cold storage technology as a means of power peak shaving. At this stage, energy is still in a period of tension, especially the power consumption of urban air-conditioning is basically in electricity. During the peak load period, it is destined to become an important area of cold storage technology application. Therefore, air-conditioning cold storage technology can play a role in shifting peaks and filling valleys by storing cold during the low power consumption period at night and releasing the cold during the peak power consumption during the day. , To alleviate the contradiction between power supply and demand, but also to save operating costs and obtain good environmental benefits.

Therefore, it is very necessary to invent a phase change cold storage emergency cooling system.

In order to solve the above technical problems, the present invention provides a phase-change cold storage emergency cooling system. By adopting four modes: direct system supply, independent cold storage, separate cold release, and combined cold release, it can realize the side storage and side supply mode and the cold storage mode. At the same time, it does not affect the operation of the central air-conditioning system. Because the PCM phase change cold storage material freezes at a positive temperature, there is no need to purchase an additional ice making host, which reduces the initial investment to solve the above problems. A phase-change cold storage emergency cooling system includes an air-conditioning refrigeration host, a main water pump, an air-conditioning terminal, a plate heat exchanger, a PCM cold storage pool, a secondary water pump, a main pipeline, and an electric valve. The main water pump is connected to the main water pump, the plate heat exchanger and the main pipeline respectively; the main water pump is connected to the water outlet at the end of the air conditioner and the plate heat exchanger through the pipeline; The heat exchanger is connected with the auxiliary water pump; the auxiliary water pumps are provided with two; the main pipeline is arranged at the water inlet at the end of the air conditioner.

The electric valve adopts a plurality of: V01, V02, V03, V04, V05, V06 and V07; the air conditioner terminal refers to an indoor refrigeration unit, such as a fan coil and a wind cabinet; the air conditioner refrigeration host specifically adopts 150RT type.

The phase change cold storage emergency cooling system includes four operating modes during operation, namely: direct supply mode, pure cold storage mode, separate cooling mode and combined cooling mode.

The direct supply mode: during operation, the electric valve V01 is opened, V02, V03, V04 and V05 are closed, the air-conditioning refrigeration host is started, the outlet water temperature is adjusted to 7°C, and the ice water at 7°C enters the main pipe through V01, and then enters the air conditioner At the end, the 13°C ice water flowing out of the end of the air conditioner flows back to the air conditioner refrigeration host.

The pure cold storage mode: start the air-conditioning refrigeration host, the electric valves V01, V02 and V04 are closed, V03 and V05 are opened, the outlet water temperature of the air-conditioning refrigeration host is adjusted to 5°C, the outlet water, 5°C ice water enters the plate heat exchanger first, and the other After heat exchange on the side, the temperature rises to 8°C, and the cold water at 8°C is sent to the main pipe and transported to the end of the air conditioner. After the cold water on the other side of the plate heat exchanger drops to 5°C, it enters the PCM cold storage pool and stores the cold with PCM The phase change cold storage module in the pool performs heat exchange, and the internal material of the cold storage module undergoes a phase change to convert the cold energy into latent heat for storage. At this time, the temperature of the ice water rises to 8°C and flows back to the plate heat exchanger to form a cycle.

The separate cooling mode: all air-conditioning refrigeration hosts stop running, the electric valves V01, V03 and V05 are closed, V02 and V04 are opened, the 12℃ air-conditioning terminal return water flows through V04 and enters the primary side of the plate heat exchanger. After the side heat exchange, the temperature drops to 8°C, flows through the V02 and then sent to the main pipe, and transported to the end of the air conditioner for use.

The combined cooling mode: during the daytime, the air-conditioning refrigeration host is operated first. When the return water temperature continues to exceed 12.5°C, the combined cooling mode starts. At this time, the electric valves V03 and V05 are closed, and V01, V02 and V04 are closed. Turn on, return water in two ways: 12.5°C return water enters the air conditioning refrigeration host, after cooling, 7°C outlet water, flows through V01, and enters the main pipeline; 12.5°C return water flows through the V04 valve, enters the PCM cold storage pool, and is absorbed by the cold storage module After the latent heat is absorbed and released, it becomes 8℃ ice water, which flows through V02 and enters the main pipe.

Compared with the conventional technology, the present invention has the following beneficial effects: 1. In the present invention, during the night when the power load is relatively low, that is, during the low power consumption period, the air conditioner is operated to cool and store the energy to store the cold; and during the day when the power load is high, that is, during the peak power consumption period, the The stored cold energy is released to meet the needs of the building’s air-conditioning load and realize the "peak shift and valley filling" of the electricity load. In layman's terms, it is to use the electricity price of 0.1 to 0.3 yuan at night to do more than 1 yuan during the day. Maximize savings in energy operating costs for central air-conditioning users. 2. In the present invention, the air-conditioning refrigeration host runs under normal air-conditioning conditions during the daytime in summer, and the average cooling temperature is 37°C. With the cooperation of the PCM cold storage pool, the air-conditioning refrigeration host runs at night, and the average cooling temperature is 32°C; production is also cold For every 1°C decrease in cooling temperature, the power consumption of the air-conditioning chiller will drop by 3%, and the energy consumption will drop by about 15%. 3. In the present invention, during the day, the cooling load has a large relationship with the sun, and the cooling load changes greatly with time. Therefore, the main engine runs at different efficiency points, and the actual time at the high efficiency point is very small. The air-conditioning refrigeration host runs at night, and the load changes Not big, the air-conditioning and refrigeration host can run for a long time at the high-efficiency point, so it saves about 20% more than ordinary systems.

The present invention will be further described below in conjunction with the accompanying drawings:

Examples:

As shown in Figure 1 to Figure 6

The present invention provides a phase change cold storage emergency cooling system, which includes an air conditioning refrigeration host 1, a main water pump 2, an air conditioner terminal 3, a plate heat exchanger 4, a PCM (Phase Change Material) cold storage pool 5, an auxiliary water pump 6, There are multiple main pipes and electric valves. The air-conditioning refrigeration hosts 1 are connected to the main water pump 2, the plate heat exchanger 4, and the main pipe 7 respectively through pipes; the main water pump 2 is connected to the air conditioner terminal 3 through the pipes. The water outlet of the PCM is connected to the plate heat exchanger 4; the PCM cold storage pool 5 is provided with two, which are respectively connected with the plate heat exchanger 4 and the auxiliary water pump 6 through pipes; the auxiliary water pump 6 is provided with two; the main pipeline 7 is installed at the water inlet of the end 3 of the air conditioner.

The electric valve adopts a plurality of: V01, V02, V03, V04, V05, V06 and V07; the air-conditioning terminal 3 refers to an indoor refrigeration unit, such as a fan coil and a wind cabinet; the air-conditioning refrigeration host 1 specifically Use 150RT type.

The phase change cold storage emergency cooling system includes four operating modes during operation, namely: direct supply mode, pure cold storage mode, separate cooling mode and combined cooling mode.

The direct supply mode: during operation, the electric valve V01 is opened, V02, V03, V04 and V05 are closed, the air-conditioning refrigeration host 1 is started, the outlet water temperature is adjusted to 7°C, and the ice water at 7°C enters the main pipe 7 through V01, and then Entering the air conditioning terminal 3, the 13°C ice water flowing out of the air conditioning terminal 3 flows back to the air conditioning refrigeration host 1.

The pure cold storage mode: start the air conditioning refrigeration host 1, the electric valves V01, V02 and V04 are closed, V03 and V05 are opened, the outlet water temperature of the air conditioning refrigeration host 1 is adjusted to 5°C, the outlet water, 5°C ice water enters the plate heat exchanger 4 first, After heat exchange with the other side, the temperature rises to 8°C, and the cold water at 8°C is sent to the main pipe 7 and sent to the air conditioner terminal 3 for use; the cold water on the other side of the plate heat exchanger 4 drops to 5°C before entering the PCM The cold storage pool 5 exchanges heat with the phase change cold storage module in the PCM cold storage pool 5. The internal material of the cold storage module undergoes a phase change to convert the cold energy into latent heat for storage. At this time, the ice water temperature rises to 8°C and flows back to the plate heat exchange.器4，Form a loop.

The separate cooling mode: all air-conditioning refrigeration hosts 1 stop running, electric valves V01, V03, and V05 are closed, V02 and V04 are opened, and the 12°C air-conditioning terminal 3 return water flows through V04 and enters the primary side of the plate heat exchanger 4. After the heat exchange with the other side, the temperature drops to 8°C, flows through V02 and then sent to the main pipe 7, and transported to the air conditioner terminal 3 for use.

The combined cooling mode: during the daytime, the air-conditioning refrigeration host 1 is operated first. When the return water temperature continues to exceed 12.5°C, the combined cooling mode is started. At this time, the electric valves V03 and V05 are closed, and V01, V02 and V04 is turned on, and there are two ways to return water: 12.5°C return water enters the air conditioning refrigeration host 1, after cooling, 7°C outlet water, flows through V01, and enters the main pipe 7; 12.5°C return water flows through the V04 valve and enters the PCM cold storage pool 5. After absorbing the latent heat absorbed and released by the cold storage module, it becomes 8°C ice water, which flows through V02 and enters the main pipe 7.

Using the technical solutions of the present invention, or those with ordinary knowledge in the technical field, under the inspiration of the technical solutions of the present invention, design similar technical solutions, and achieving the above technical effects fall within the protection scope of the present invention.

1: Air conditioning and refrigeration host 2: Main water pump 3: Air conditioner end 4: Plate heat exchanger 5: PCM cold storage pool 6: Secondary water pump 7: Main pipeline V01, V02, V03, V04, V05, V06, V07: electric valve

Figure 1 is a schematic diagram of the structure of the present invention. Figure 2 is a schematic diagram of the system of the present invention. Figure 3 is a schematic diagram of the direct supply mode of the present invention. Figure 4 is a schematic diagram of the pure cold storage mode of the present invention. Figure 5 is a schematic diagram of the independent cold storage mode of the present invention. Figure 6 is a schematic diagram of the combined cold storage mode of the present invention.

1: Air conditioning and refrigeration host

2: Main water pump

3: Air conditioner end

4: Plate heat exchanger

5: PCM cold storage pool

6: Secondary water pump

7: Main pipeline

V01, V02, V03, V04, V05, V06, V07: electric valve

Claims (7)

A phase change cold storage emergency cooling system, which includes an air conditioning refrigeration host (1), a main water pump (2), an air conditioning terminal (3), a plate heat exchanger (4), and a PCM cold storage pool (5) , A secondary water pump (6), a main pipeline (7) and an electric valve, the air conditioning refrigeration host (1) adopts multiple, through the pipeline respectively with the main water pump (2), the plate heat exchanger (4) Connected to the main pipeline (7); the main water pump (2) is connected to the outlet of the air conditioner terminal (3) and the plate heat exchanger (4) through the pipeline; the PCM cold storage pool (5) is provided with two , The plate heat exchanger (4) and the auxiliary water pump (6) are connected by pipes; the auxiliary water pumps (6) are provided with two; the main pipe (7) is installed at the water inlet of the air conditioner end (3) Place. The phase-change cold storage emergency cooling system described in claim 1, wherein: the electric valve adopts a plurality of: V01, V02, V03, V04, V05, V06 and V07; the air-conditioning terminal (3) refers to indoor refrigeration Units, such as fan coils and wind cabinets; the air-conditioning refrigeration host (1) specifically adopts the 150RT type. The phase-change cold storage emergency cooling system as described in claim 2, wherein: the phase-change cold storage emergency cooling system includes four operating modes during operation, namely: a continuous supply mode, a pure cold storage mode, and a separate cooling mode And a joint cooling mode. The phase-change cold storage emergency cooling system described in claim 3, wherein: the direct supply mode: during operation, the electric valve V01 is opened, V02, V03, V04 and V05 are closed, and the air-conditioning refrigeration host (1) is turned on. The temperature of the outlet water is adjusted to 7°C. The ice water at 7°C enters the main pipe (7) through V01, and then enters the air conditioner terminal (3). The ice water at 13°C flowing out of the air conditioner terminal (3) flows back to the air conditioner refrigeration host ( 1). The phase-change cold storage emergency cooling system according to claim 3, wherein: the pure cold storage mode: start the air-conditioning refrigeration host (1), the electric valves V01, V02 and V04 are closed, V03 and V05 are opened, the air-conditioning refrigeration host (1) The temperature of the outlet water is adjusted to 5°C, and the outlet water, 5°C ice water first enters the plate heat exchanger (4), and after heat exchange with the other side, the temperature rises to 8°C, and the cold water at 8°C is sent to the main pipe ( 7), and transported to the end of the air conditioner (3) for use; after the cold water on the other side of the plate heat exchanger (4) drops to 5°C, it enters the PCM cold storage pool (5), and the PCM cold storage pool (5) The internal phase change cold storage module performs heat exchange, and the internal material of the cold storage module undergoes a phase change to convert the cold energy into latent heat for storage. At this time, the ice water temperature rises to 8°C and flows back to the plate heat exchanger (4) to form a cycle. The phase-change cold storage emergency cooling system described in claim 3, wherein: the separate cooling mode: the air-conditioning refrigeration host (1) all stop running, the electric valves V01, V03 and V05 are closed, V02 and V04 are open, 12 The return water from the end (3) of the air conditioner at ℃ flows through V04 and enters the primary side of the plate heat exchanger (4). After heat exchange with the other side, the temperature drops to 8℃, and then flows through V02 to the main pipe (7). ), and transported to the end of the air conditioner (3) for use. The phase-change cold storage emergency cooling system described in claim 3, wherein: the combined cooling mode: during the daytime, the air-conditioning refrigeration host (1) is operated first, and when the return water temperature continues to exceed 12.5°C, it starts to start In this combined cooling mode, at this time, the electric valves V03 and V05 are closed, V01, V02 and V04 are opened, and there are two ways to return water: 12.5°C return water enters the air-conditioning refrigeration main unit (1), and after cooling, the water is discharged at 7°C. Flows through V01 and enters the main pipe (7); 12.5°C return water flows through V04 and enters the PCM cold storage pool (5). After absorbing the latent heat absorbed by the cold storage module, it becomes 8°C ice water and flows through V02 to enter the PCM cold storage pool (5). Main pipe (7).

Images