CN115540103A - heat exchange system - Google Patents

Abstract

The invention provides a heat exchange system which comprises a liquid storage tank, a single heat exchange unit, a first circulation pipeline connected between the liquid storage tank and the heat exchange unit and a second circulation pipeline respectively connected with the liquid storage tank and the heat exchange unit, wherein the heat exchange system has a first operation mode, in the first operation mode, a heat transfer medium in the liquid storage tank flows through the heat exchange unit through the first circulation pipeline for heat exchange and then returns to the liquid storage tank, and meanwhile, the heat transfer medium from an external water return end flows through the heat exchange unit through the second circulation pipeline for heat exchange and then is supplied to an external water supply end. The heat exchange system can simultaneously meet the requirements of cold accumulation (or heat accumulation) and cold supply (or heat supply) through a single heat exchange unit, so that the electrical load of the system is greatly reduced, the overall energy consumption is reduced, and the energy-saving effect is obvious.

Description

heat exchange system

technical field

The present invention relates to a heat exchange system, more specifically to a water cold storage system or a water heat storage system.

Background technique

At present, most water storage systems adopt the joint supply method of multiple chillers in the design. When there is still a demand for cooling load at the end of the air conditioner during the low power period, when some chillers are turned on for cold storage, another part will be turned on. The cooling machine provides cooling to meet the demand of terminal cooling load.

However, when the cooling load at the end of the water storage system is very low at night, at least two cooling machines need to be turned on to meet the needs of cold storage and cooling supply at the same time, which has at least the following disadvantages: the overall energy consumption of the system is high, It is not conducive to energy saving and emission reduction; the design requires at least 2 chillers, and the investment is high; the capacity of the transformer is high, and the system load is large.

Contents of the invention

Therefore, the present invention aims to solve the above-mentioned problems existing in the prior art. More specifically, the present invention aims to provide a heat exchange system that can realize side storage and side supply through a single heat exchange unit, such as at the end of night or When the cooling load on the user side is low, only a single heat exchange unit is turned on for cold storage, and at the same time, the same heat exchange unit can be used for cooling by switching the valve to meet the functional requirements of low load at night.

According to one aspect of the present invention, a heat exchange system is provided, the heat exchange system includes a liquid storage tank, a single heat exchange unit, and a first circulation pipeline connected between the liquid storage tank and the heat exchange unit and a second circulation pipeline respectively connected to the liquid storage tank and the heat exchange unit, the heat exchange system has a first operation mode, and in the first operation mode, the heat exchanger in the liquid storage tank The heat medium flows through the heat exchange unit through the first circulation pipeline for heat exchange and then returns to the liquid storage tank, while the heat transfer medium from the external return water end flows through the second circulation pipeline through the The heat exchange unit is supplied to the external water supply end after heat exchange.

Preferably, the first circulation pipeline may include a first pipeline and a second pipeline, and the second circulation pipeline may include a third pipeline, a fourth pipeline and a fifth pipeline, wherein the The first pipeline can be connected between the first end of the liquid storage tank and the water inlet pipeline of the heat exchange unit; the second pipeline can be connected between the water outlet pipeline of the heat exchange unit and the between the second ends of the liquid storage tank; the third pipeline may be connected between the first pipeline and the external water supply end; the fourth pipeline may be connected between the external return water end and the between the first pipelines; the fifth pipeline can be connected between the first pipeline and the second pipeline, and in the first operation mode, the first end of the liquid storage tank The heat transfer medium can flow through the first pipeline, the fourth pipeline, the water inlet pipeline of the heat exchange unit, the heat exchange unit, the water outlet pipeline of the heat exchange unit, the first Two pipelines to the second end of the liquid storage tank; and, the heat transfer medium from the external return water end can flow through the water inlet pipeline of the heat exchange unit, the heat exchange unit, and the heat exchange unit Outlet pipeline to the external water supply end.

Preferably, the heat exchange system can also have a second operation mode, and in the second operation mode, the heat transfer medium at the first end of the liquid storage tank can flow through the first pipeline, the The water inlet pipeline of the heat exchange unit, the heat exchange unit, the water outlet pipeline of the heat exchange unit, the second pipeline, and the second end of the liquid storage tank.

Preferably, the heat exchange system can also have a third operation mode, in the third operation mode, the heat transfer medium at the second end of the liquid storage tank can flow through the second pipeline, the first Five pipelines, the first pipeline, the third pipeline to the external water supply end, the fourth pipeline from the external return water end, the first pipeline to the The first end of the reservoir.

Preferably, the heat exchange system may further include: a first valve, a second valve, set on the first pipeline; a third valve, set on the second pipeline; a fourth valve, set on the On the water inlet pipeline of the heat exchange unit; the fifth valve is set on the water outlet pipeline of the heat exchange unit; the sixth valve is set on the third pipeline; the seventh valve is set on the fourth pipeline; The eighth valve is arranged on the fifth pipeline, and the first pipeline can be connected to the water inlet pipeline of the heat exchange unit between the water inlet end of the heat exchange unit and the fourth valve; The second pipeline can be connected to the water outlet pipeline of the heat exchange unit between the water outlet end of the heat exchange unit and the fifth valve; the third pipeline can be connected between the first valve and the fifth valve. connected to the first pipeline between the second valve; the fourth pipeline may be connected to the first pipeline between the first end of the liquid storage tank and the first valve; The fifth line may be connected to the first line between the first valve and the second valve and to the second end of the reservoir between the third valve and the reservoir. the second pipeline.

Preferably, in the first operation mode, the seventh valve, the fourth valve, the third valve, and the fifth valve can be opened, and the first valve, the second valve, and the The sixth valve, the eighth valve can be closed.

Preferably, in the second operation mode, the first valve, the second valve, and the third valve can be opened, and the fourth valve, the fifth valve, the sixth valve, the The seventh valve and said eighth valve may be closed.

Preferably, in the third operation mode, the eighth valve, the sixth valve, and the seventh valve can be opened, and the first valve, the second valve, the third valve, the The fourth valve and said fifth valve may be closed.

Preferably, a first pump may be provided on the first pipeline, and a second pump may be provided on the pipeline between the heat exchange unit and the external return water end.

Preferably, the heat exchange system further includes a controller, the controller can control the opening and closing of each valve, so that the heat exchange system can selectively operate in the first operation mode, the second operation mode or the third operation mode. run in mode.

Preferably, the heat exchange system is a water cold storage system, the heat exchange unit may be a water chiller, the first end of the liquid storage tank may be a high temperature end, and the second end of the liquid storage tank may be a low temperature end or the heat exchange system may be a water heat storage system, the heat exchange unit may be a heating unit, the first end of the liquid storage tank may be a low-temperature end, and the second end of the liquid storage tank may be a high temperature end.

Description of drawings

Fig. 1 schematically shows a schematic diagram of a heat exchange system according to an embodiment of the present invention;

Fig. 2 schematically shows a schematic diagram of a heat exchange system operating in a second operating mode (eg, cold storage mode);

Fig. 3 schematically shows a schematic diagram of a heat exchange system operating in a third operating mode (for example, a cooling mode);

Fig. 4 schematically shows a schematic diagram of a heat exchange system operating in a first operating mode (for example, a storage-while-supply mode).

Explanation of reference signs:

1-first valve; 2-second valve; 3-third valve; 4-fourth valve; 5-fifth valve; 6-sixth valve; 7-seventh valve; 8-eighth valve; 9- Ninth valve; 10-liquid storage tank; 11-first pipeline; 12-second pipeline; 13-third pipeline; 14-fourth pipeline; 15-fifth pipeline; 20-heat exchange unit ; 21-water inlet pipeline; 22-water outlet pipeline; 30-cooling tower; 41-first pump; 42-second pump; 43-third pump.

detailed description

In order to enable those skilled in the art to better understand the technical concept of the present invention, specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. In the accompanying drawings, the same reference numerals always represent the same components.

As shown in FIG. 1, the heat exchange system according to the embodiment of the present invention may include a liquid storage tank 10, a heat exchange unit 20, a first circulation pipeline connected between the liquid storage tank 10 and the heat exchange unit 20, and a The liquid storage tank 10 and the second circulation pipeline connected to the heat exchange unit 20 can also be connected to the outside (user side or end user). The heat exchange system described herein may be a water cold storage system or a water heat storage system. In the following, the heat exchange system is described by taking the water cold storage system as an example. The heat exchange system can have multiple operating modes, for example, the heat exchange system can operate in the cold storage mode, the cooling or cooling mode, and the side storage and side supply mode.

When the power is low at night and there is no cooling load demand at the end, the heat exchange system can be operated in the cold storage mode, and the heat transfer medium (for example, high-temperature heat transfer medium) from the liquid storage tank 10 can pass through the first circulation pipe After passing through the heat exchange unit 20 for heat exchange (that is, cooling down), the road flows back to the liquid storage tank 10 to realize cold storage.

During peak power hours during the day, the heat exchange system can be operated in cooling or cooling mode, and the heat exchange unit 20 can be deactivated, and the low-temperature heat transfer medium in the liquid storage tank 10 can be used for external (for example, user side or terminal) users) for cooling. The heat transfer medium (for example, low-temperature heat transfer medium) from the liquid storage tank 10 is supplied to the external water supply end through the second circulation pipeline (user-side water supply as shown in FIG. 1 ), and then the heat transfer medium passes through the external return water end (The return water on the user side as shown in FIG. 1 ) returns to the liquid storage tank 10, thereby realizing cooling or cooling.

When the power is low at night and there is still a cooling load demand at the end, the heat exchange system can be operated in the mode of side storage and side supply. Obviously different from the traditional heat exchange system that relies on at least two heat exchange units to meet the demands of cold storage and cooling supply, the heat exchange system proposed by the present invention can meet the demands of simultaneous cold storage and cooling supply through a single heat exchange unit 20 . Specifically, in the side-storage-while-supply mode, the heat transfer medium in the liquid storage tank 10 can flow through the heat exchange unit 20 through the first circulation pipeline for heat exchange and then return to the liquid storage tank 10 for cold storage. The heat transfer medium at the external return water end flows through the same heat exchange unit 20 through the second circulation pipeline for heat exchange, and then is supplied to the external water supply end for cooling.

Through the different designs of the circulation pipeline and the control of each valve set in the circulation pipeline, different heat transfer medium flow paths are planned for different operation modes, so that each operation mode can operate independently of each other without affecting each other, and In the mode of side storage and side supply, a single heat exchange unit can be used to realize cold storage and cold supply at the same time, and at this time, the cold storage path and the cold supply path do not interfere with each other.

1, the heat exchange system may include a first pipeline 11 to a fifth pipeline 15, the first pipeline 11 may be connected between the first end of the liquid storage tank 10 and the water inlet pipeline 21 of the heat exchange unit 20, The second pipeline 12 can be connected between the outlet pipeline 22 of the heat exchange unit 20 and the second end of the liquid storage tank 10, and the third pipeline 13 can be connected between the first pipeline 11 and the external water supply end (as shown in Figure 1 Between the user side water supply shown in ), the fourth pipeline 14 can be connected between the external return water end (user side return water shown in Figure 1) and the first pipeline 11, the fifth pipeline 15 It can be connected between the first pipeline 11 and the second pipeline 12 .

The above-mentioned first circulation pipeline may include a first pipeline 11 and a second pipeline 12 , and the second circulation pipeline may include a third pipeline 13 , a fourth pipeline 14 and a fifth pipeline 15 .

In addition, the heat exchange system also includes a first valve 1 to an eighth valve 8, the first valve 1 and the second valve 2 are set on the first pipeline 11, the third valve 3 is set on the second pipeline 12, and the fourth valve 3 is set on the second pipeline 12. The valve 4 is set on the water inlet pipeline 21 of the heat exchange unit 20, the fifth valve 5 is set on the water outlet pipeline 22 of the heat exchange unit 20, the sixth valve 6 is set on the third pipeline 13, and the seventh valve 7 is set on the On the fourth line 14 the eighth valve 8 is arranged on the fifth line 15 . The first pipeline 11 is connected to the water inlet pipeline 21 of the heat exchange unit 20 between the water inlet end of the heat exchange unit 20 and the fourth valve 4 , and the second pipeline 12 is connected between the water outlet end of the heat exchange unit 20 and the fifth valve 5 connected to the outlet pipeline 22 of the heat exchange unit 20, the third pipeline 13 is connected to the first pipeline 11 between the first valve 1 and the second valve 2, and the fourth pipeline 14 is connected to the liquid storage tank 10. The first end and the first valve 1 are connected to the first pipeline 11, the fifth pipeline 15 is connected to the first pipeline 11 between the first valve 1 and the second valve 2, and connected between the third valve 3 and the second valve 2. The second ends of the liquid storage tank 10 are connected to a second pipeline 12 .

In addition, a first pump 41 may also be provided on the first pipeline 11 , and a second pump 42 may be provided on the pipeline between the heat exchange unit 20 and the external return water end. The first pump 41 may be a cold water storage pump, which is used as a cold water storage pump when storing cold, and as a cold water discharge pump when cooling.

These valves can be electric valves or other types of valves, and the heat exchange system can include a controller to control the opening and closing of each valve, and can also control the operation of each pump to arrange different heat transfer medium flow paths so that The heat exchange system operates selectively in different operating modes.

Fig. 2 to Fig. 4 respectively show the schematic diagrams of the operation of the heat exchange system in the cold storage mode, the cooling mode and the side storage and side supply mode.

In the cold storage mode shown in Figure 2, the controller can control the first valve 1, the second valve 2, and the third valve 3 to open, so that the fourth valve 4, the fifth valve 5, the sixth valve 6, and the seventh valve 7 and the eighth valve 8 are closed, and the first pump 41 is operated. Furthermore, the substation 20 is switched on. As indicated by the solid line arrow in Figure 2, the heat transfer medium at the first end of the liquid storage tank 10 (for example, the high temperature end, such as the upper end of the liquid storage tank 10 shown in Figure 2) flows through the first pipeline 11. The water inlet pipeline 21 of the heat exchange unit 20, the heat exchange unit 20, the water outlet pipeline 22 of the heat exchange unit 20, the second pipeline 12, and the second end of the liquid storage tank 10 (for example, the low temperature end, as shown in the figure 2) in the lower end of the liquid storage tank 10 shown in 2), thereby realizing cold storage.

In the case where the heat exchange system is a water storage system, the heat exchange unit 20 can be a water chiller to cool down the heat transfer medium flowing through the heat exchange unit 20, and in this case, it can also be provided with the heat exchange unit 20 is connected to the cooling tower 30, and the ninth valve 9 and the third pump 43 are arranged on the pipeline of the heat exchange unit 20 and the cooling tower 30, thereby forming a cooling circulation loop for cooling the heat transfer medium. When the heat exchange unit is turned on At 20 o'clock, the cooling tower 30, the ninth valve 9 and the third pump 43 can also be opened to allow the heat transfer medium to flow therethrough.

Here, the heat exchange unit 20 is described only by way of example (if necessary, a cooling tower 30 and related pumps and valves can be provided), but the form of the heat exchange unit 20 is not limited thereto, as long as the requirements for the flow through the heat exchange unit can be satisfied. The heat transfer medium can perform heat exchange. In addition, here only the water storage system is used to describe the heat exchange system. If the heat exchange system is a heat storage system, the heat exchange unit 20 may be a heating unit for heating the heat transfer medium flowing through the heat exchange unit.

In the cooling or cooling mode shown in Figure 3, the controller controls the eighth valve 8, the sixth valve 6, and the seventh valve 7 to open, the first valve 1, the second valve 2, the third valve 3, the The four valves 4 and the fifth valve 5 are closed, and the first pump 41 is operated. As indicated by the solid line arrow in FIG. 3 , the heat transfer medium (for example, low-temperature heat transfer medium) at the second end (for example, the low-temperature end, such as the lower end of the liquid storage tank 10 shown in FIG. 3 ) of the liquid storage tank 10 medium) flows through the second pipeline 12, the fifth pipeline 15, the first pipeline 11, and the third pipeline 13 to the external water supply end, enters the external water supply end for cooling and becomes a high-temperature heat transfer medium, and returns from the outside The water end flows through the fourth pipeline 14, the first pipeline 11 to the first end of the liquid storage tank 10 (for example, the high temperature end, such as the upper end of the liquid storage tank 10 shown in Figure 3), thus completing the cooling Or let cool.

In the side-storage-while-supply mode shown in Figure 4, the controller controls the opening of the seventh valve 7, the fourth valve 4, the third valve 3, and the fifth valve 5, and the first valve 1, the second valve 2, and the sixth valve The valve 6 and the eighth valve 8 are closed, the second pump 42 is turned on, and the heat exchange unit 20 , the cooling tower 30 , the ninth valve 9 and the third pump 43 are turned on. As indicated by the solid arrow in FIG. 4 , the heat transfer medium at the first end of the liquid storage tank 10 (for example, the high temperature end, such as the upper end of the liquid storage tank 10 shown in FIG. 4 ) flows through the first pipeline. 11. The fourth pipeline 14, the water inlet pipeline 21 of the heat exchange unit 20, the heat exchange unit 20, the cooling tower 30, the water outlet pipeline 22 of the heat exchange unit 20, the second pipeline 12 to the second pipe of the liquid storage tank 10 end, to realize cold storage; and, as indicated by the hollow arrow in Figure 4, the heat transfer medium from the external return water end flows through the water inlet pipeline 21 of the heat exchange unit 20, the heat exchange unit 20, and the outlet of the heat exchange unit 20 The water pipeline 22 is connected to an external water supply end to realize cooling. Thus, cold storage and cooling requirements are realized through a single heat exchange unit 20 .

The above only describes the heat exchange system by taking the water cold storage system as an example. The flow path arrangement and valve control mode of the above heat exchange system of the present invention are also applicable to the heat storage system. The applicable temperature range of the medium is different. For example, for a heat storage system, the heat exchange unit may be a heating unit. In this case, in order to realize heat storage, the heat transfer medium at the low temperature end of the liquid storage tank may flow to the heat exchange unit (that is, the heating unit) After the temperature is raised, it returns to the high temperature end of the liquid storage tank 10, thereby realizing heat storage. The mode of releasing heat or supplying heat and supplying while storing can also be performed in a manner similar to the mode of releasing or supplying cooling and supplying while storing.

By using the above-mentioned heat exchange system, when there is still a load demand at the end of the night, only a single heat exchange unit can be turned on to meet the cold storage (or heat storage) and cooling (or heat supply) at the same time, so that the system's electricity load Significantly reduced, the overall energy consumption is reduced, and the energy-saving effect is very obvious.

Specific embodiments of the present invention have been described in detail above. Although some embodiments have been shown and described, those skilled in the art should understand that without departing from the principle and spirit of the present invention whose scope is defined by the claims, These embodiments can be combined, modified and perfected (for example, different technical features of the present invention can be combined to obtain a new technical solution). These combinations, modifications and improvements should also be within the protection scope of the present invention.

Claims (11)

1. A heat exchange system, characterized in that, the heat exchange system comprises a liquid storage tank (10), a single heat exchange unit (20), connected between the liquid storage tank (10) and the heat exchange unit ( 20) between the first circulation pipeline and the second circulation pipeline connected with the liquid storage tank (10) and the heat exchange unit (20) respectively, The heat exchange system has a first operation mode, and in the first operation mode, the heat transfer medium in the liquid storage tank (10) flows through the heat exchange unit (20) through the first circulation pipeline ) to return to the liquid storage tank (10) after heat exchange, while the heat transfer medium from the external return water end flows through the second circulation pipeline through the heat exchange unit (20) for heat exchange and then is supplied to external water supply. 2. The heat exchange system according to claim 1, characterized in that, the first circulation pipeline comprises a first pipeline (11) and a second pipeline (12), and the second circulation pipeline comprises a first pipeline Three pipelines (13), the fourth pipeline (14) and the fifth pipeline (15), wherein, The first pipeline (11) is connected between the first end of the liquid storage tank (10) and the water inlet pipeline (21) of the heat exchange unit (20); The second pipeline (12) is connected between the outlet pipeline (22) of the heat exchange unit (20) and the second end of the liquid storage tank (10); The third pipeline (13) is connected between the first pipeline (11) and the external water supply end; The fourth pipeline (14) is connected between the external return water end and the first pipeline (11); The fifth pipeline (15) is connected between the first pipeline (11) and the second pipeline (12), In the first operation mode, the heat transfer medium at the first end of the liquid storage tank (10) flows through the first pipeline (11), the fourth pipeline (14), the exchange The water inlet pipeline (21) of the thermal unit (20), the heat exchange unit (20), the water outlet pipeline (22) of the heat exchange unit (20), the second pipeline (12) to the The second end of the liquid storage tank (10); and, the heat transfer medium from the external return water end flows through the water inlet pipeline (21) of the heat exchange unit (20), the heat exchange unit (20), The water outlet pipeline (22) of the heat exchange unit (20) is connected to the external water supply end. 3. The heat exchange system according to claim 2, characterized in that, The heat exchange system also has a second operation mode. In the second operation mode, the heat transfer medium at the first end of the liquid storage tank (10) flows through the first pipeline (11), the The water inlet pipeline (21) of the heat exchange unit (20), the heat exchange unit (20), the water outlet pipeline (22) of the heat exchange unit (20), the second pipeline (12), to the second end of the reservoir (10). 4. The heat exchange system according to claim 2, characterized in that, The heat exchange system also has a third operation mode. In the third operation mode, the heat transfer medium at the second end of the liquid storage tank (10) flows through the second pipeline (12), the The fifth pipeline (15), the first pipeline (11), the third pipeline (13) to the external water supply end, and flows through the fourth pipeline from the external water return end ( 14), the first pipeline (11) to the first end of the liquid storage tank (10). 5. The heat exchange system according to any one of claims 2 to 4, wherein the heat exchange system further comprises: The first valve (1) and the second valve (2) are arranged on the first pipeline (11); a third valve (3), arranged on the second pipeline (12); The fourth valve (4) is arranged on the water inlet pipeline (21) of the heat exchange unit (20); The fifth valve (5) is arranged on the water outlet pipeline (22) of the heat exchange unit (20); a sixth valve (6), arranged on the third pipeline (13); a seventh valve (7), arranged on the fourth pipeline (14); The eighth valve (8), set on the fifth pipeline (15), The first pipeline (11) is connected to the water inlet pipeline (21) of the heat exchange unit (20) between the water inlet end of the heat exchange unit (20) and the fourth valve (4); The second pipeline (12) is connected to the water outlet pipeline (22) of the heat exchange unit (20) between the water outlet end of the heat exchange unit (20) and the fifth valve (5); said third pipeline (13) is connected to said first pipeline (11) between said first valve (1) and said second valve (2); The fourth pipeline (14) is connected to the first pipeline (11) between the first end of the liquid storage tank (10) and the first valve (1); The fifth pipeline (15) is connected to the first pipeline (11) between the first valve (1) and the second valve (2), and is connected to the third valve (3 ) and the second end of the liquid storage tank (10) are connected to the second pipeline (12). 6. The heat exchange system according to claim 5, characterized in that, In the first operation mode, the seventh valve (7), the fourth valve (4), the third valve (3), and the fifth valve (5) are opened, and the first valve ( 1), the second valve (2), the sixth valve (6), and the eighth valve (8) are closed. 7. The heat exchange system according to claim 5, characterized in that, In the second operating mode, the first valve (1), the second valve (2), and the third valve (3) are opened, and the fourth valve (4), the fifth valve ( 5), the sixth valve (6), the seventh valve (7) and the eighth valve (8) are closed. 8. The heat exchange system according to claim 5, wherein: In the third operation mode, the eighth valve (8), the sixth valve (6), and the seventh valve (7) are opened, and the first valve (1), the second valve ( 2), the third valve (3), the fourth valve (4) and the fifth valve (5) are closed. 9. The heat exchange system according to claim 5, characterized in that, the first pipeline (11) is provided with a first pump (41), and the heat exchange unit (20) and the external return water A second pump (42) is provided on the pipeline between the ends. 10. The heat exchange system according to claim 5, characterized in that, the heat exchange system further comprises a controller, the controller controls the opening and closing of each valve, so that the heat exchange system selectively Running in the first operation mode, the second operation mode or the third operation mode. 11. The heat exchange system according to claim 2, characterized in that, the heat exchange system is a water cold storage system, the heat exchange unit (20) is a chiller unit, and the first storage tank (10) end is a high temperature end, and the second end of the liquid storage tank (10) is a low temperature end; or The heat exchange system is a water heat storage system, the heat exchange unit (20) is a heating unit, the first end of the liquid storage tank (10) is a low temperature end, and the first end of the liquid storage tank (10) The two ends are high temperature ends.

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