A heat exchange system

Abstract

The application discloses a heat exchange system, comprising a load heat exchange device, a first mechanical refrigeration device and a natural cooling device, the first evaporator of the first mechanical refrigeration device can exchange heat with the load heat exchange device through a heat exchange fluid; the natural cooling device can exchange heat with the load heat exchange device through the heat exchange fluid and can exchange heat with the first condenser of the first mechanical refrigeration device through the heat exchange fluid. In the above-mentioned heat exchange system, by simultaneously arranging the first mechanical refrigeration device and the natural cooling device, the natural cooling device can help cool the first condenser, improve the cooling efficiency, so that the first mechanical refrigeration device and the natural cooling device can be selected according to the ambient temperature, the environment can be fully utilized for cooling, the energy consumption is reduced, the natural cooling device is fully utilized, the equipment utilization rate is improved, and the heat exchange efficiency is further improved. As a result, the heat exchange system can effectively solve the problem of large energy consumption of the heat exchange system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat exchange, more particularly, to a heat exchange system. BACKGROUND

[0002] At present, the data center air conditioner host is mainly in the traditional way of converting electric energy into mechanical energy for refrigeration, and also uses natural cold source, but no matter which cooling method is used, the optimal cooling effect cannot be obtained.

[0003] In the process of realizing the present application, the inventor found that at least the following problems exist in the prior art: when cooling the heat source equipment, the heat exchange system has the problem of relatively large energy consumption. SUMMARY

[0004] Therefore, the purpose of the present application is to provide a heat exchange system which can effectively solve the problem of relatively large energy consumption of the heat exchange system.

[0005] In order to achieve the above purpose, the present application provides the following technical scheme:

[0006] A heat exchange system, comprising a load heat exchange device, a first mechanical refrigeration device and a natural cooling device, the first evaporator of the first mechanical refrigeration device can exchange heat with the load heat exchange device through a heat exchange fluid; the natural cooling device can exchange heat with the load heat exchange device through a heat exchange fluid and can exchange heat with the first condenser of the first mechanical refrigeration device through a heat exchange fluid.

[0007] When the load heat exchange device is exchanged, it is mainly exchanged by the natural cooling device, considering the natural cooling device, which is too dependent on the environment, which makes it impossible to meet the requirements when the environmental temperature is too high. The first mechanical refrigeration device is added, which is not dependent on the environment, so that the first mechanical refrigeration device can be started when the environmental temperature is too high, and the natural cooling device can exchange heat with the first condenser in the first mechanical refrigeration device. Compared with direct exchange of environmental wind, the heat exchange efficiency is higher, so that the first mechanical refrigeration device has better refrigeration effect. This makes it possible to directly cool through the natural cooling device when the environmental temperature is relatively low; when the environmental temperature is relatively high, the first mechanical refrigeration device can be started, and the first condenser can be cooled by the natural cooling device, so that better refrigeration efficiency can be obtained. In the above heat exchange system, the first mechanical refrigeration device and the natural cooling device are provided at the same time, and the natural cooling device can help the first condenser to cool and improve the cooling efficiency, so that the first mechanical refrigeration device and the natural cooling device can be selected according to the environmental temperature, the environment can be fully utilized for cooling to reduce energy consumption, and the natural cooling equipment is fully utilized to improve the utilization rate of the equipment and further improve the heat exchange efficiency. The heat exchange system can effectively solve the problem of relatively large energy consumption of the heat exchange system.

[0008] In some embodiments, the natural cooling device comprises a first liquid supply and return channel for supplying heat exchange fluid to the load heat exchange device and a second liquid supply and return channel for supplying heat exchange fluid to the first condenser, the first and second liquid supply and return channels are connected in parallel, the first liquid supply and return channel is provided with a first on-off valve, and the second liquid supply and return channel is provided with a second on-off valve.

[0009] In some embodiments, the natural cooling device further comprises a total supply pump, and outlets of the total supply pump are connected to the first and second liquid supply and return channels respectively.

[0010] In some embodiments, the natural cooling device is a cooling water tower.

[0011] In some embodiments, the natural cooling device further comprises an evaporative heat exchanger, the evaporative heat exchanger comprises an evaporative heat exchange channel and a first cooling heat exchange channel capable of heat exchange with each other, the load heat exchange device has a load heat exchange channel, the evaporative heat exchange channel is the first evaporator, so that the heat exchange fluid in the first mechanical refrigeration device can flow through the evaporative heat exchange channel, and the first cooling heat exchange channel is connected in series with the load heat exchange channel.

[0012] In some embodiments, the natural cooling device further comprises a natural cooling heat exchanger, the natural cooling heat exchanger comprises a natural cooling heat exchange channel and a second cooling heat exchange channel capable of heat exchange with each other, the natural cooling heat exchange channel is connected to the heat exchange channel of the natural cooling device, and the second cooling heat exchange channel is connected in series with the load heat exchange channel.

[0013] In some embodiments, the first cooling heat exchange channel and the second cooling heat exchange channel are connected in parallel or in series, and the outlet of the load heat exchange channel is connected in series with a working pump.

[0014] In some embodiments, the first evaporator is arranged at the load heat exchange device, and the load heat exchange device is further provided with a load cooling channel acting on the same object as the first evaporator, and the load cooling channel is connected in series in the fluid channel of the natural cooling device.

[0015] In some embodiments, the natural cooling device further comprises a cold storage device and a second mechanical refrigeration system for cold storage operation of the cold storage device, a second evaporator of the second mechanical refrigeration system is connected to the fluid in the cold storage device to make the cold storage device perform cold storage operation, and the natural cooling device can exchange heat with a second condenser of the second mechanical refrigeration system.

[0016] In some embodiments, the cold storage device is connected to the load cooling channel. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to make the technical solutions in the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description only need to be some embodiments of the present application, and other drawings can be obtained by those of ordinary skill in the art without any creative effort.

[0018] Fig. 1 The structural schematic diagram of the heat exchange system provided by the embodiment of the present application is shown in the figure.

[0019] Fig. 2 The structural schematic diagram of another heat exchange system provided by the embodiment of the present application is shown in the figure.

[0020] The marks in the figures are as follows:

[0021] Load heat exchange device 1, first mechanical refrigeration device 2, natural cooling device 3, evaporative heat exchanger 4, natural cooling heat exchanger 5, second mechanical refrigeration system 6, load cooling channel 7, cold storage device 8.

[0022] Load heat exchange channel 1-1.

[0023] First evaporator 2-1, first condenser 2-2.

[0024] First liquid supply and return channel 3-1, second liquid supply and return channel 3-2, first on-off valve 3-3, second on-off valve 3-4, total supply pump 3-5.

[0025] First cooling heat exchange channel 4-1.

[0026] Natural cooling heat exchange channel 5-1, second cooling heat exchange channel 5-2.

[0027] Second evaporator 6-1, second condenser 6-2. DETAILED DESCRIPTION

[0028] The embodiment of the present application discloses a heat exchange system, which can effectively solve the problem of large energy consumption of the heat exchange system.

[0029] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without any creative effort belong to the protection scope of the present application.

[0030] Please refer to Figs. 1-2 , Fig. 1 The structural schematic diagram of the heat exchange system provided by the embodiment of the present application is shown in the figure. Fig. 2Another structure schematic diagram of a heat exchange system provided by the embodiment of the present application

[0031] A heat exchange system is provided in some embodiments, which mainly comprises a load heat exchange device 1, a first mechanical refrigeration device 2 and a natural cooling device 3.

[0032] The load heat exchange device 1, which is mainly arranged at the load, can also be understood as a heat source device, that is, the load heat exchange device 1 needs to absorb heat from the load to cool the load. The load, such as a server, a storage device and the like, is a heating device when working. The load heat exchange device 1 is generally provided with a heat exchange channel, and after the low-temperature fluid flows into the heat exchange channel, it absorbs heat and then flows out to quickly take out the heat. In order to accelerate the heat exchange with the surrounding air, a wind body acceleration device such as a fan can also be added.

[0033] The mechanical refrigeration device mainly works by compression refrigeration. Generally, the mechanical refrigeration device mainly comprises an evaporator, a compressor, a condenser and a throttling element which are sequentially and circularly communicated. Considering that there can be multiple mechanical refrigeration devices of different forms in the present application, in order to facilitate the distinction, the first and the second are used for distinction, wherein the first mechanical refrigeration device 2 corresponds to a first evaporator 2-1, a first compressor, a first condenser 2-2 and a first throttling element.

[0034] The natural cooling device 3, which is generally a cooling water tower, can also be an outdoor air cooling device, and can also be a natural water cooling device, which means using natural water for direct cooling. The natural water is low-temperature water in rivers, lakes and the like. The natural cooling device 3 means using an environmental low-temperature medium to absorb heat under a temperature difference, such as low-temperature wind, low-temperature water or other low-temperature fluids, and can also use the heat taken away by the evaporation of liquid fluids.

[0035] The first evaporator 2-1 of the first mechanical refrigeration device 2 can exchange heat with the load heat exchange device 1 through a heat exchange fluid, so that the first mechanical refrigeration device 2 can directly exchange heat with the load heat exchange device 1 through the first evaporator 2-1. Specifically, the heat exchange here can be used to absorb the heat at the load heat exchange device 1 to achieve cooling. It should be noted that: the first evaporator 2-1 can be arranged to exchange heat between the load heat exchange device 1 and the wind body or corresponding structure at the load heat exchange device 1; or the load heat exchange device 1 can be provided with a heat exchange channel, and the heat exchange fluid of the load heat exchange device 1 and the fluid in the first evaporator 2-1 directly exchange heat or exchange heat through a heat exchanger.

[0036] The natural cooling device 3 can exchange heat with the load heat exchange device 1 through the heat exchange fluid, so that the natural cooling device 3 can directly exchange heat with the load heat exchange device 1. Specifically, the heat exchange here can be used to absorb heat at the load heat exchange device 1 to achieve cooling. When the heat exchange channel is arranged at the load heat exchange device 1, it should be noted that the natural cooling device 3 can be directly connected in series with the heat exchange channel of the load heat exchange device 1; or the heat exchange fluid of the load heat exchange device 1 and the fluid in the first evaporator 2-1 can exchange heat through the heat exchanger. Generally, the fluid in the natural cooling device 3 is not the same as the fluid in the mechanical refrigeration device, and the heat exchange fluid in the natural cooling device 3 generally uses water and does not need to be evaporated in the heat exchange process; while the mechanical refrigeration device is generally a mechanical compression refrigeration system, which generally needs to be evaporated to absorb heat in the heat exchange process, so it has an evaporator.

[0037] The natural cooling device 3 can also exchange heat with the first condenser 2-2 of the first mechanical refrigeration device 2 through the heat exchange fluid to cool the first condenser 2-2 of the first mechanical refrigeration device 2. It should be noted that when directly cooling the load heat exchange device 1, the first mechanical refrigeration device 2 and the natural cooling device 3 are selected to work directly or simultaneously. In actual application, when the cooling capacity is large, the natural cooling device 3 alone cannot meet the cooling capacity requirement of the load heat exchange device 1, so the first mechanical refrigeration device 2 needs to be turned on, and the natural cooling device 3 is also turned on to exchange heat with the first condenser 2-2, so that the first condenser 2-2 is cooled, thereby ensuring the normal work of the first mechanical refrigeration device 2; when the cooling capacity requirement is not large, the natural cooling device 3 can be turned on alone, and the first mechanical refrigeration device 2 does not need to be turned on, and the natural cooling device 3 directly exchanges heat with the load heat exchange device 1 to cool it. When connected, a valve device can be arranged to enable the natural cooling device 3 to selectively exchange heat with one of the first condenser 2-2 or the load heat exchange device 1, so that when the first mechanical refrigeration device 2 alone exchanges heat with the load heat exchange device 1, the fluid in the natural cooling device 3 only flows to the first condenser 2-2 and does not directly flow to the load heat exchange device 1; when the natural cooling device 3 alone exchanges heat with the load heat exchange device 1, the fluid in the natural cooling device 3 only flows to the load heat exchange device 1 and does not flow to the first condenser 2-2.

[0038] In the heat exchange system, when the load heat exchange device 1 is in heat exchange, mainly through the natural cooling device 3, considering the natural cooling device 3, it is too dependent on the environment, which makes it difficult to meet the requirements when the ambient temperature is too high. The first mechanical refrigeration device 2 is added, which is not dependent on the environment, so that the first mechanical refrigeration device 2 can be started when the ambient temperature is too high, and the natural cooling device 3 can exchange heat with the first condenser 2-2 in the first mechanical refrigeration device 2. Compared with directly using ambient air for heat exchange, the heat exchange efficiency is higher, so that the first mechanical refrigeration device 2 has better refrigeration effect. This makes it possible to directly cool through the natural cooling device 3 when the ambient temperature is relatively low; when the ambient temperature is relatively high, the first mechanical refrigeration device 2 can be started, and the first condenser 2-2 is cooled by the natural cooling device 3, so that better refrigeration efficiency can be obtained. In the heat exchange system, the first mechanical refrigeration device 2 and the natural cooling device 3 are provided at the same time, and the natural cooling device 3 can help the first condenser 2-2 to cool and improve the cooling efficiency, so that the first mechanical refrigeration device 2 and the natural cooling device 3 can be selected according to the ambient temperature. The environment can be fully utilized for cooling to reduce energy consumption, and the natural cooling equipment can be fully utilized to improve equipment utilization and further improve heat exchange efficiency. The heat exchange system can effectively solve the problem of high energy consumption of the heat exchange system.

[0039] In some embodiments, in order to better make the natural cooling device 3 work, the energy consumption is reduced. Preferably, the natural cooling device 3 includes a first liquid supply and return channel 3-1 for supplying heat exchange fluid to the load heat exchange device 1 and a second liquid supply and return channel 3-2 for supplying heat exchange fluid to the first condenser 2-2. It should be noted that the liquid supply and return channel mainly includes a liquid supply channel and a liquid return channel. The liquid supply channel is used to supply the fluid cooled by the natural cooling device 3, and the heat-absorbing fluid is returned to the natural cooling device 3 through the liquid return channel, and then supplied to the liquid supply channel after being cooled by the natural cooling device 3. The first liquid supply and return channel 3-1 is used to supply heat exchange fluid to the load heat exchange device 1, and is not used to guide the heat exchange fluid to the load heat exchange device 1, because in addition to directly guiding the heat exchange fluid to the load heat exchange device 1 for heat exchange, it can also be indirectly heat exchanged through a heat exchanger. The heat exchanger is heat exchanged, for example, the first liquid supply and return channel 3-1 is connected to a heat exchange channel in the heat exchanger, and another heat exchange channel in the heat exchanger is connected to the heat exchange channel of the load heat exchange device 1.

[0040] Preferably, the first supply and return liquid channel 3-1 and the second supply and return liquid channel 3-2 are connected in parallel, meaning the heat exchange fluid in the natural cooling device 3 is diverted to the first supply and return liquid channel 3-1 and the second supply and return liquid channel 3-2. For ease of operation, the first supply and return liquid channel 3-1 can be equipped with a first switching valve 3-3, and the second supply and return liquid channel 3-2 can be equipped with a second switching valve 3-4. With this configuration, when the natural cooling device 3 is operating alone, the first switching valve 3-3 is open and the second switching valve 3-4 is closed; while when the first mechanical refrigeration device 2 is exchanging heat with the load heat exchange device 1, the first switching valve 3-3 is closed and the second switching valve 3-4 is open.

[0041] If the first supply and return liquid channel 3-1 and the second supply and return liquid channel 3-2 are connected in series, that is, the heat exchange fluid in the natural cooling device 3 first passes through the first supply and return liquid channel 3-1 and then through the second supply and return liquid channel 3-2, or the heat exchange fluid first passes through the second supply and return liquid channel 3-2 and then through the first supply and return liquid channel 3-1. Specifically, the fluid first passes through the first supply and return liquid channel 3-1 and then through the second supply and return liquid channel 3-2, for example, the fluid flows through the supply channel of the first supply and return liquid channel 3-1, then through the return channel of the first supply and return liquid channel 3-1, then through the supply channel of the second supply and return liquid channel 3-2, and then through the return channel of the second supply and return liquid channel 3-2.

[0042] In some embodiments, to better achieve fluid circulation and reduce the number of pumps used, a main supply pump 3-5 can be provided. The outlet of the main supply pump 3-5 is connected to the first supply and return liquid channel 3-1 and the second supply and return liquid channel 3-2, so that the fluid in both the first supply and return liquid channel 3-1 and the second supply and return liquid channel 3-2 is driven by the main supply pump 3-5 to ensure fluid flow.

[0043] In some embodiments, as shown in the appendix Fig. 1 As shown, to achieve better heat exchange and avoid using too many heat exchange channels in the load heat exchange device 1, an evaporator heat exchanger 4 is preferably included. The evaporator heat exchanger 4 includes an evaporator heat exchange channel and a first cooling heat exchange channel 4-1 capable of exchanging heat with each other. The load heat exchange device 1 has a load heat exchange channel 1-1. The heat exchange fluid in the first mechanical refrigeration device 2 can flow through the evaporator heat exchange channel, thus using the evaporator heat exchange channel as the first evaporator 2-1 of the first mechanical refrigeration device 2. The first cooling heat exchange channel 4-1 is connected in series with the load heat exchange channel 1-1.

[0044] At this time, the natural cooling device 3 can be connected in series with the load heat exchange channel 1-1, or it can be connected to the load heat exchange channel 1-1 through another heat exchanger.

[0045] In some embodiments, in order to better distinguish indoor and outdoor, it is preferred here that the heat exchange channels between the load heat exchange device 1 and the natural cooling device 3 are not directly connected. Based on this, it is also preferred here to further include a natural cooling heat exchanger 5, wherein the natural cooling heat exchanger 5 includes a natural cooling heat exchange channel 5-1 and a second cooling heat exchange channel 5-2 capable of exchanging heat with each other. Among them, the natural cooling heat exchange channel 5-1 is connected to the heat exchange channel of the natural cooling device 3, so that the heat exchange fluid in the natural cooling device 3 can flow into the natural cooling heat exchange channel 5-1, such as the natural cooling heat exchange channel 5-1. Both ends are respectively connected to the liquid supply channel of the first liquid supply and return channel 3-1 and the liquid return channel of the first liquid supply and return channel 3-1. Moreover, the second cooling heat exchange channel 5-2 is in series with the load heat exchange channel 1-1.

[0046] It should be noted that when the load heat exchange device 1 and the evaporation heat exchange device are provided at the same time, the first cooling heat exchange channel 4-1 and the second cooling heat exchange channel 5-2 are in parallel or in series. If it is in series, along the flow direction, the second cooling heat exchange channel 5-2 and the first cooling heat exchange channel 4-1 can be connected in sequence, so that the fluid flowing out of the load heat exchange channel 1-1 is first cooled by the second cooling heat exchange channel 5-2, and then cooled by the first cooling heat exchange channel 4-1. At this time, it means that the natural cooling device 3 and the first mechanical refrigeration device 2 directly exchange heat with the load heat exchange device 1 at the same time, and the natural cooling device 3 cools the first condenser 2-2 at the same time. It should be noted that when the natural cooling device 3 and the first mechanical refrigeration device 2 directly work on the load heat exchange device 1 alone, at this time the fluid in the load heat exchange channel 1-1 avoids the first cooling heat exchange channel 4-1 or the second cooling heat exchange channel 5-2 through the valve group corresponding to it, in order to reduce unnecessary flow path.

[0047] Since the load heat exchange channel 1-1 and the natural cooling device 3, the first mechanical refrigeration device 2 are separated, at this time the outlet of the load heat exchange channel 1-1 can be in series with a working pump; wherein the working pump is in series between the outlet of the load heat exchange channel 1-1 and the inlet of the first cooling heat exchange channel or the inlet of the second cooling heat exchange channel 5-2.

[0048] In some embodiments, correspondingly, a condensation heat exchanger can be provided, which has a condensation heat exchange channel and a cooling channel, wherein the cooling channel is connected to the second liquid supply and return channel 3-2, and the condensation heat exchange channel is used as the first condenser 2-2.

[0049] In some embodiments, as shown in the accompanying drawings Fig. 2As shown, the first evaporator 2-1 can be arranged at the load heat exchange device 1, and the load cooling channel 7 which acts on the same object as the first evaporator 2-1 is arranged at the load heat exchange device 1, and the load cooling channel 7 is connected in series in the fluid channel of the natural cooling device 3, so that when natural cooling is performed, the natural cooling device 3 directly supplies the heat exchange fluid to the load heat exchange device 1, and the heat exchange fluid in the first mechanical refrigeration device 2 is directly supplied to the load heat exchange device 1. The use of the above-mentioned evaporative heat exchanger 4 and the natural cooling heat exchanger 5 is avoided, and the heat exchange efficiency can be greatly improved.

[0050] At this time, the load heat exchange device 1 can still be provided with a load heat exchange channel 1-1, or a fan, or a heat exchange plate, to exchange heat with the above-mentioned object. The load heat exchange channel 1-1 exchanges heat with the load cooling channel 7 and the first evaporator 2-1.

[0051] In some embodiments, when the cold storage device 8 is arranged, in order to better exchange heat, a second mechanical refrigeration system 6 for cold storage operation of the cold storage device 8 is preferably further included, a second evaporator 6-1 of the second mechanical refrigeration system 6 exchanges heat with the fluid in the cold storage device 8 to make the cold storage device 8 perform cold storage operation; and the natural cooling device 3 can exchange heat with a second condenser 6-2 of the second mechanical refrigeration system 6.

[0052] The same cold storage device 8 can preferably be connected to the above-mentioned load cooling channel 7 to exchange heat with the load heat exchange device 1 by using the load cooling channel 7. At this time, the fluid in the cold storage device 8 and the second evaporator 6-1 exchange heat through a heat exchanger. The cold storage device 8 and the natural cooling device 3 use the same heat exchange fluid, and are located in the same system, so that the natural cooling device 3 can also make the cold storage device 8 perform cold storage operation.

[0053] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other.

[0054] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A heat exchange system, characterized by, The system comprises a load heat exchange device (1), a first mechanical refrigeration device (2) and a natural cooling device (3), the first evaporator (2-1) of the first mechanical refrigeration device (2) can exchange heat with the load heat exchange device (1) through a heat exchange fluid; the natural cooling device (3) can exchange heat with the load heat exchange device (1) through a heat exchange fluid, and can exchange heat with the first condenser (2-2) of the first mechanical refrigeration device (2) through a heat exchange fluid, the natural cooling device comprises a first liquid supply and return channel for supplying the load heat exchange device with a heat exchange fluid and a second liquid supply and return channel for supplying the first condenser with a heat exchange fluid, and the first liquid supply and return channel and the second liquid supply and return channel are arranged in parallel or in series.

2. The heat exchange system according to claim 1, wherein The first liquid supply and return channel is provided with a first on-off valve, and the second liquid supply and return channel is provided with a second on-off valve.

3. The heat exchange system according to claim 2, wherein A total supply pump is further included, and the outlet of the total supply pump is communicated with the first liquid supply and return channel and the second liquid supply and return channel respectively.

4. The heat exchange system according to claim 3, wherein The natural cooling device is a cooling water tower.

5. The heat exchange system according to any one of claims 1 to 4, wherein The system comprises an evaporation heat exchanger, the evaporation heat exchanger comprises an evaporation heat exchange channel and a first cooling heat exchange channel capable of exchanging heat with each other; the load heat exchange device has a load heat exchange channel; the evaporation heat exchange channel is the first evaporator, so that the heat exchange fluid in the first mechanical refrigeration device can flow through the evaporation heat exchange channel; and the first cooling heat exchange channel is in series with the load heat exchange channel.

6. The heat exchange system according to claim 5, wherein A natural cooling heat exchanger is further included, the natural cooling heat exchanger comprises a natural cooling heat exchange channel and a second cooling heat exchange channel capable of exchanging heat with each other; the natural cooling heat exchange channel is communicated to the heat exchange channel of the natural cooling device, and the second cooling heat exchange channel is in series with the load heat exchange channel.

7. The heat exchange system of claim 6, wherein, The first cooling heat exchange channel and the second cooling heat exchange channel are in parallel or in series; and the outlet of the load heat exchange channel is in series with a working pump.

8. The heat exchange system according to any one of claims 1 to 4, wherein The first evaporator is arranged at the load heat exchange device, and a load cooling channel for the same object as the first evaporator is further arranged at the load heat exchange device, and the load cooling channel is in series in the fluid channel of the natural cooling device.

9. The heat exchange system of claim 8, wherein, A cold storage device and a second mechanical refrigeration system for cold storage work of the cold storage device are further included, the second evaporator of the second mechanical refrigeration system exchanges heat with the fluid in the cold storage device to enable the cold storage device to perform cold storage work; and the natural cooling device can exchange heat with the second condenser of the second mechanical refrigeration system.

10. The heat exchange system of claim 9, wherein, The cold storage device is connected to the load cooling channel.

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