Heat load device for testing heat exchange coefficient of plate heat exchanger and testing method thereof

Abstract

The application discloses a heat load device for testing the heat exchange coefficient of a plate heat exchanger and a testing method thereof. The device comprises a heat generation device, an inner circulation pipeline system, an outer circulation pipeline system and a heat dissipation device. The heat generation device, the inner circulation pipeline system, the plate heat exchanger to be tested, the outer circulation pipeline system and the heat dissipation device are sequentially connected. The plate heat exchanger to be tested has two hot side interfaces and two cold side interfaces. The inner circulation pipeline system is connected to the two hot side interfaces of the plate heat exchanger to be tested, and the outer circulation pipeline system is connected to the two cold side interfaces of the plate heat exchanger to be tested. The application can simulate the working condition of an engineering site to test the heat exchange performance of the plate heat exchanger before delivery, so that the heat exchange capacity of the plate heat exchanger can meet the design requirement.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of frequency converter testing, in particular to a heat load device for testing the heat exchange coefficient of a plate heat exchanger and a testing method thereof. BACKGROUND

[0002] With the comprehensive promotion of infrastructure construction in China, especially the construction of high-speed rail, subway, highway and other infrastructure, the application of shield tunnel boring machine has become more and more common. Because the water-cooled frequency conversion device has many advantages such as smooth operation of cutter motor, slow positioning, prolonging the service life of the motor, improving the safety of the motor, etc., its application in shield tunnel boring machine is becoming more and more popular.

[0003] At present, the overall water-cooled frequency conversion device is usually tested before leaving the factory, and the core component of the water-cooled heat transfer device is a plate heat exchanger. The plate heat exchanger is a theoretical calculation value in the design and selection, and there is a lack of testing device for the plate heat exchanger before assembly. Therefore, if the water-cooled frequency conversion device fails the test, it needs to be disassembled and analyzed, which is time-consuming and labor-intensive. Therefore, it is necessary to test the heat exchange coefficient of the core component of the plate heat exchanger of the shield water-cooled frequency conversion device in advance when designing the shield water-cooled frequency conversion device, so as to avoid the heat exchange capacity of the equipment not meeting the design requirements in the actual operation process. SUMMARY

[0004] Therefore, the present application provides a heat load device for testing the heat exchange coefficient of a plate heat exchanger and a testing method thereof, which can simulate the working conditions of the engineering site to test the heat exchange performance of the plate heat exchanger before leaving the factory, and ensure that the heat exchange capacity meets the design requirements.

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

[0006] A heat load device for testing the heat exchange coefficient of a plate heat exchanger, comprising: a heat generating device, an inner circulation pipeline system, an outer circulation pipeline system and a heat dissipation device; the heat generating device, the inner circulation pipeline system, the plate heat exchanger to be tested, the outer circulation pipeline system and the heat dissipation device are connected in sequence; the plate heat exchanger to be tested has two hot side interfaces and two cold side interfaces; the inner circulation pipeline system is connected to the two hot side interfaces of the plate heat exchanger to be tested, and the outer circulation pipeline system is connected to the two cold side interfaces of the plate heat exchanger to be tested;

[0007] The heat generating device is used for heating the fluid medium in the inner circulation pipeline system; the plate heat exchanger to be tested is used for heat exchange between the fluid medium of the inner circulation pipeline system and the fluid medium of the outer circulation pipeline system; the inner circulation pipeline system and the outer circulation pipeline system are respectively used for monitoring the related parameters of the fluid medium before and after heat exchange; and the heat dissipation device is used for heat dissipation of the fluid medium in the outer circulation pipeline system.

[0008] Further, the inner circulation pipeline system comprises an inner circulation pipeline, and an inner circulation water pump, an inner circulation water supply temperature meter, an inner circulation return water temperature meter and an inner circulation flow meter installed on the inner circulation pipeline; the inner circulation pipeline is a closed structure; two hot side interfaces of the plate heat exchanger to be tested are a hot side water supply interface and a hot side return water interface respectively; the inner circulation water supply temperature meter is installed close to the hot side water supply interface; and the inner circulation return water temperature meter is installed close to the hot side return water interface.

[0009] Further, the outer circulation pipeline system comprises an outer circulation pipeline, and an outer circulation water pump, an outer circulation water supply temperature meter, an outer circulation return water temperature meter and an outer circulation flow meter installed on the outer circulation pipeline; two cold side interfaces of the plate heat exchanger to be tested are a cold side water supply interface and a cold side return water interface respectively; the outer circulation water supply temperature meter is installed close to the cold side water supply interface, and the outer circulation return water temperature meter is installed close to the cold side return water interface; the outer circulation pipeline is an open structure, and an open end thereof is connected to the heat dissipation device.

[0010] Further, the heat dissipation device comprises a cooling tower, a spray head and a cooling fan; the open end of the outer circulation pipeline is a water supply end and a return water end respectively, the water supply end of which extends into a fluid medium in the cooling tower, and the return water end is installed with the spray head; and the cooling fan is installed close to the spray head, and is used for evaporating and dissipating heat of the fluid medium sprayed by the spray head.

[0011] Further, the heat generating device comprises a plurality of electrical heat generating components.

[0012] The application further provides a test method of a heat load device for testing a heat exchange coefficient of a plate heat exchanger, comprising the following steps:

[0013] Starting the heat generating power of the heat generating device according to a theoretically calculated heat of the plate heat exchanger to be tested;

[0014] When the heat of the heat generating device, the heat exchange device and the heat dissipation device is in a relative balance state, a plurality of groups of fluid medium related parameters in the inner circulation pipeline system and the outer circulation pipeline system are collected every interval preset time;

[0015] According to the average value of the plurality of groups of fluid medium related parameters, the heat exchange coefficient of the plate heat exchanger to be tested is calculated.

[0016] 8, further, the calculation formula of the heat exchange coefficient of the plate heat exchanger to be tested is:

[0017] Q1=C1·q m1 ·ΔT m1 =C1·ρ1·F 25 ·(T 23 -T 24 )

[0018] Q2 = C2 * q m2 * DeltaT m2 = C2 * p2 * F 45 * (T 44 - T 43 )

[0019] Q1 = Q2 = Q3

[0020]

[0021]

[0022] Wherein, Q1 is the heat production of the heat production device, Q2 is the heat dissipation of the heat dissipation device, Q3 is the heat exchange of the plate heat exchanger to be measured;C1 is the specific heat capacity of the inner circulating fluid medium, q m1 is the mass flow of the inner circulating fluid medium, DeltaT m1 is the temperature difference of the inner circulating fluid medium supply liquid and return liquid, p1 is the density of the inner circulating fluid medium, F 25 is the flow of the inner circulating fluid medium, T 23 is the supply liquid temperature of the inner circulating fluid medium, T 24 is the return liquid temperature of the inner circulating fluid medium;C2 is the specific heat capacity of the outer circulating fluid medium, q m2 is the mass flow of the outer circulating fluid medium, DeltaT m2 is the temperature difference of the outer circulating fluid medium supply liquid and return liquid, p2 is the density of the outer circulating fluid medium, F 45 is the flow of the outer circulating fluid medium, T 43 is the supply liquid temperature of the outer circulating fluid medium, T 44 is the return liquid temperature of the outer circulating fluid medium;DeltaT m3 is the logarithmic mean temperature difference;K is the heat transfer coefficient, f is the correction factor, and A is the heat exchange area of the plate heat exchanger.

[0023] Through the above technical scheme, compared with the prior art, the heat load device for testing the heat transfer coefficient of the plate heat exchanger is provided, which can test the heat transfer coefficient of the plate heat exchanger in advance by simulating the use condition of the engineering site before the product is shipped, so as to ensure that the heat exchange capacity can meet the design requirements, avoid the situation that the heat exchange capacity of the equipment does not meet the design requirements in the actual operation process, and lead to the situation that the water-cooled frequency converter sends a high temperature signal (early warning), and even may send a trip signal (shutdown). BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to make the technical solutions of 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 aim to explain part of the embodiments of the present application, and all other embodiments obtained by those skilled in the art without creative effort belong to the protection scope of the present application.

[0025] Figure 1 The structural schematic diagram of the heat load device for testing the heat exchange coefficient of the plate heat exchanger is provided. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort belong to the protection scope of the present application.

[0027] As Figure 1 shown, the embodiment of the present application discloses a heat load device for testing the heat exchange coefficient of the plate heat exchanger, which comprises a heat generating device 1, an inner circulation pipeline system 2, an outer circulation pipeline system 4 and a heat dissipating device 5; the heat generating device 1, the inner circulation pipeline system 2, the plate heat exchanger to be tested 3, the outer circulation pipeline system 4 and the heat dissipating device 5 are connected in sequence; the plate heat exchanger to be tested 3 has two hot side interfaces and two cold side interfaces; the inner circulation pipeline system 2 is connected to the two hot side interfaces of the plate heat exchanger to be tested 3, and the outer circulation pipeline system 4 is connected to the two cold side interfaces of the plate heat exchanger to be tested 3.

[0028] The heat generating device 1 is used for heating the fluid medium in the inner circulation pipeline system 2; the plate heat exchanger to be tested 3 is used for heat exchanging the fluid medium in the inner circulation pipeline system 2 and the fluid medium in the outer circulation pipeline system 4; the inner circulation pipeline system 2 and the outer circulation pipeline system 4 are respectively used for monitoring the related parameters of the fluid medium before and after heat exchange; and the heat dissipating device 5 is used for dissipating heat of the fluid medium in the outer circulation pipeline system 4.

[0029] The heat generating device 1 comprises a plurality of electrical heating devices 6. The electrical heating devices 6 with rated power continuously output heat, which is transmitted to the plate heat exchanger to be tested 3 through the inner circulation fluid medium of the inner circulation pipeline system 2 (primary heat exchange equipment), and then transmitted to the heat dissipating device 5 through the outer circulation fluid medium of the outer circulation pipeline system 4 (secondary heat exchange equipment), and finally the heat dissipating device 5 is started to evaporate and dissipate heat.

[0030] In one specific embodiment, the internal circulation pipeline system 2 includes: an internal circulation pipeline 21, and an internal circulation water pump 22, an internal circulation water supply thermometer 23, an internal circulation water return thermometer 24, and an internal circulation flow meter 25 installed on the internal circulation pipeline 21; the internal circulation pipeline 21 is a closed structure; the two hot-side interfaces of the plate heat exchanger 3 under test are a hot-side water supply interface and a hot-side water return interface, respectively; the internal circulation water supply thermometer 23 is installed near the hot-side water supply interface; the internal circulation water return thermometer 24 is installed near the hot-side water return interface.

[0031] In one specific embodiment, the external circulation pipeline system 4 includes: an external circulation pipe 41, and an external circulation water pump 42, an external circulation supply water thermometer 43, an external circulation return water thermometer 44, and an external circulation flow meter 45 installed on the external circulation pipe 41; the two cold-side interfaces of the plate heat exchanger 3 under test are a cold-side supply water interface and a cold-side return water interface, respectively; the external circulation supply water thermometer 43 is installed near the cold-side supply water interface, and the external circulation return water thermometer 44 is installed near the cold-side return water interface; the external circulation pipe 41 has an open structure, and its open end is connected to the heat dissipation device 5.

[0032] In this embodiment of the invention, when the inner and outer circulation pipeline systems circulate (connected by pipes, the flow direction of the fluid medium is the same as...) Figure 1 The arrows on the corresponding pipes are in the same direction. The fluid medium (e.g., water) of the internal circulation pipeline system 2 (primary heat exchange equipment) and the fluid medium of the external circulation pipeline system 4 (secondary heat exchange equipment) have different requirements (the former is a closed circulation system, not connected to the atmosphere, and not easily contaminated; the latter is an open circulation system, connected to the atmosphere, and easily contaminated). They are separated by the multi-layer plates of the plate heat exchanger 3 under test. The power source of the internal circulation pipeline system 2 (primary heat exchange equipment) is the internal circulation water pump 22. When the internal circulation pipeline system 2 (primary heat exchange equipment) is working, it carries the heat generated by the electrical heating device 6 installed in the heat generation device to the plate heat exchanger 3. The power source of the external circulation pipeline system 4 (secondary heat exchange equipment) is the external circulation water pump 42. When the external circulation pipeline system 4 (secondary heat exchange equipment) is working, it carries the heat on the plate heat exchanger 3 under test to the heat dissipation device 5 for evaporative heat dissipation.

[0033] In one embodiment, the heat dissipation device 5 includes a cooling tower 51, a nozzle 52, and a cooling fan 53; the open ends of the external circulation pipe 41 are the water supply end and the water return end, respectively, with the water supply end extending into the fluid medium inside the cooling tower 51 and the nozzle 52 installed at the water return end; the cooling fan 53 is installed close to the nozzle and is used to evaporate and dissipate heat from the fluid medium sprayed from the nozzle.

[0034] In the embodiment of the present application, the water supply end of the open end of the outer circulation pipeline 41 extends into the cooling fluid medium in the cooling tower 51, the plate heat exchanger 3 to be tested exchanges heat between the cooling fluid medium and the fluid in the inner circulation pipeline 21, takes away the heat in the inner circulation pipeline 21, then sprays the fluid medium after heat exchange through the spray head 52 of the water return end, and then radiates the sprayed fluid medium through the cooling fan 53, so as to reduce the temperature of the spray water of the cooling tower.

[0035] When the heat of the whole heat load device is in a balanced state, the heat exchange coefficient can be tested through six detection instruments, i.e., the inner circulation water supply temperature meter 23, the inner circulation water return temperature meter 24, the inner circulation flow meter 25 of the inner circulation pipeline system 2 (the primary heat exchange equipment) and the outer circulation water supply temperature meter 43, the outer circulation water return temperature meter 44, and the outer circulation flow meter 45 of the outer circulation pipeline system 4 (the secondary heat exchange equipment).

[0036] In view of this, the present application further provides a test method of a heat load device for testing the heat exchange coefficient of a plate heat exchanger, which comprises the following steps:

[0037] Starting the heat production power of the heat production device according to the theoretically calculated heat of the plate heat exchanger to be tested;

[0038] When the heat of the heat production device, the heat exchange device and the heat radiation device is in a relatively balanced state, collecting a plurality of groups of fluid medium related parameters in the inner circulation pipeline system and the outer circulation pipeline system every interval preset time;

[0039] According to the average value of the plurality of groups of fluid medium related parameters, calculating the heat exchange coefficient of the plate heat exchanger to be tested.

[0040] The above steps are further described as follows.

[0041] 1. Before starting, checking the heat load device (such as circuit, waterway, plate heat exchanger to be tested pipeline interface inspection, etc.).

[0042] 2. Starting the inner circulation water pump 22 on the inner circulation pipeline system 2, the outer circulation water pump 42 on the outer circulation pipeline system 4 and the cooling fan 53 on the heat radiation device 5.

[0043] 3. According to the theoretically calculated flow requirement of the plate heat exchanger to be tested 3, outputting the corresponding flow (the flow range can be adjusted through the frequency converter of the water pump motor, for example, the range is 0.001-0.01 m 3 / s), that is, checking the inner circulation flow meter 25 on the inner circulation pipeline system 2 and the inner circulation flow meter 45 on the outer circulation pipeline system 4, and the flows of the two flow meters are preferably adjusted to be different (generally, the difference is 10-30%).

[0044] 4, start the electrical heating device 6 on the heat production device 1 (according to the theoretical calculation of the heat of the plate heat exchanger 3 to be measured to determine which combination to put in, for example, there are 6 groups of electrical heating devices, and the heat production power is 10x10 3 W, 10x10 3 W, 20x10 3 W, 20x10 3 W, 50x10 3 W, and 50x10 3 W, if the theoretical calculation of the heat production power requirement is 100x10 3 W, there may be different arrangements, such as 50x10 3 +50x10 3 , 50x10 3 +20x10 3 +20x10 3 +10x10 3 , which can be started according to the actual situation.

[0045] 5, after the heat load device is stable (the process from starting to stable operation generally takes 600s, at this time the heat of the heat production device, heat exchanger and heat dissipation device is relatively balanced), then collect the data on the 6 detection instruments every certain time (generally interval 100, 200s, this process generally takes 600s), that is, the inner circulation water temperature meter 23 (T23), the inner circulation return water temperature meter 24 (T24), the inner circulation flow meter 25 (F25) on the inner circulation pipeline system 2 and the outer circulation water temperature meter 43 (T43), the outer circulation return water temperature meter 44 (T44), the outer circulation flow meter 45 (F45) on the outer circulation pipeline system 4, generally collect 3-5 groups of data (take the arithmetic mean), in order to substitute the arithmetic mean of the related collected data into formulas (1)-(5) for calculation, and finally obtain the heat exchange coefficient K of the plate heat exchanger 3 to be measured.

[0046] 6, after shutdown, restore the heat load device (initial state).

[0047] Among them, the calculation formula of the heat exchange coefficient of the plate heat exchanger to be measured is:

[0048] Q1=C1·q m1 ·ΔT m1 =C1·ρ1·F 25 ·(T 23 -T 24 ) (1)

[0049] Q2=C2·q m2 ·ΔT m2 =C2·ρ2·F 45 ·(T 44 -T43 ) (2)

[0050] Q1 = Q2 = Q3 (3)

[0051]

[0052]

[0053] wherein Q1 is the heat production of the heat production device, Q2 is the heat dissipation of the heat dissipation device, and Q3 is the heat exchange of the plate heat exchanger to be measured, all in units of watts (W); C1 is the specific heat capacity of the inner circulating fluid medium, in units of joules per kilogram kelvin (J / (kg·K)); q m1 is the mass flow rate of the inner circulating fluid medium, in units of kilograms per second (kg / s); ΔT m1 is the temperature difference between the liquid supply and the liquid return of the inner circulating fluid medium, in units of kelvin (K); ρ1 is the density of the inner circulating fluid medium, in units of kilograms per cubic meter (kg / m 3 ); F 25 is the flow rate of the inner circulating fluid medium, in units of cubic meters per second (m 3 / s); T 23 is the liquid supply temperature of the inner circulating fluid medium, in units of kelvin (K); T 24 is the liquid return temperature of the inner circulating fluid medium, in units of kelvin (K); C2 is the specific heat capacity of the outer circulating fluid medium, in units of joules per kilogram kelvin (J / (kg·K)); q m2 is the mass flow rate of the outer circulating fluid medium, in units of kilograms per second (kg / s); ΔT m2 is the temperature difference between the liquid supply and the liquid return of the outer circulating fluid medium, in units of kelvin (K); ρ2 is the density of the outer circulating fluid medium, in units of kilograms per cubic meter (kg / m 3 ); F 45 is the flow rate of the outer circulating fluid medium, in units of cubic meters per second (m 3 / s); T 43 is the liquid supply temperature of the outer circulating fluid medium, in units of kelvin (K); T 44 is the liquid return temperature of the outer circulating fluid medium, in units of kelvin (K); ΔT m3 is the logarithmic mean temperature difference, in units of kelvin (K); K is the heat transfer coefficient, in units of watts per square meter kelvin (W / (m 2 ·K)); f is a correction factor, dimensionless, which is taken as 1 here; and A is the heat exchange area of the plate heat exchanger, in units of square meters (m 2 ).

[0054] The various embodiments described in this specification are implemented in a progressive manner, each embodiment focusing on the differences from other embodiments, and the same or similar parts between embodiments can be mutually referred to. For the apparatus disclosed by the embodiments, since it corresponds to the method disclosed by the embodiments, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0055] The above description of disclosed embodiments enables one of ordinary skill in the art to make or use the application. Various modifications to these embodiments will be readily apparent to those of ordinary skill in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Therefore, the application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method of testing the heat transfer coefficient of a plate heat exchanger, characterized in that The application is applied to a heat load device, which comprises a heat generating device, an inner circulation pipeline system, an outer circulation pipeline system and a heat dissipating device; the heat generating device, the inner circulation pipeline system, a to-be-tested plate heat exchanger, the outer circulation pipeline system and the heat dissipating device are connected in sequence; the to-be-tested plate heat exchanger has two hot side interfaces and two cold side interfaces; the inner circulation pipeline system is connected to the two hot side interfaces of the to-be-tested plate heat exchanger, and the outer circulation pipeline system is connected to the two cold side interfaces of the to-be-tested plate heat exchanger. The heat generating device is used for heating fluid medium in the inner circulation pipeline system; the to-be-tested plate heat exchanger is used for heat exchange between fluid medium in the inner circulation pipeline system and fluid medium in the outer circulation pipeline system; the inner circulation pipeline system and the outer circulation pipeline system are respectively used for monitoring fluid medium related parameters before and after heat exchange; and the heat dissipating device is used for heat dissipation of fluid medium in the outer circulation pipeline system. The test method of the heat load device comprises the following steps: starting the heat generating power of the heat generating device according to the theoretical calculation heat of the to-be-tested plate heat exchanger; when the heat of the heat generating device, the to-be-tested plate heat exchanger and the heat dissipating device is in a relative balance state, collecting multiple groups of fluid medium related parameters in the inner circulation pipeline system and the outer circulation pipeline system every interval preset time; calculating the heat exchange coefficient of the to-be-tested plate heat exchanger according to the average value of the multiple groups of fluid medium related parameters; the calculation formula of the heat exchange coefficient of the to-be-tested plate heat exchanger is: Q1 = C1 - q m1 • ΔT m1 = C1 - p1 - F 25 • (T 23 - T 24 ) Q2 = C2 - q m2 • ΔT m2 = C2 - p2 - F 45 • (T 44 - T 43 ) Q1=Q2=Q3 Wherein, Q1 is the heat production of the heat production device, Q2 is the heat dissipation of the heat dissipation device, Q3 is the heat exchange of the plate heat exchanger to be measured; C1 is the specific heat capacity of the inner circulating fluid medium, q m1 is the mass flow of the inner circulating fluid medium, ΔT m1 is the temperature difference of the inner circulating fluid medium, ρ1 is the density of the inner circulating fluid medium, F 25 is the flow of the inner circulating fluid medium, T 23 is the liquid supply temperature of the inner circulating fluid medium, T 24 is the liquid return temperature of the inner circulating fluid medium; C2 is the specific heat capacity of the outer circulating fluid medium, q m2 is the mass flow of the outer circulating fluid medium, ΔT m2 is the temperature difference of the outer circulating fluid medium, ρ2 is the density of the outer circulating fluid medium, F 45 is the flow of the outer circulating fluid medium, T 43 is the liquid supply temperature of the outer circulating fluid medium, T 44 is the liquid return temperature of the outer circulating fluid medium; ΔT m3 is the logarithmic mean temperature difference; K is the heat exchange coefficient, f is the correction factor, and A is the heat exchange area of the plate heat exchanger.

2. A test method for testing the heat transfer coefficient of a plate heat exchanger according to claim 1, characterized in that, The inner circulation pipeline system comprises an inner circulation pipeline, and an inner circulation water pump, an inner circulation water supply temperature meter, an inner circulation return water temperature meter and an inner circulation flow meter installed on the inner circulation pipeline; the inner circulation pipeline is of a closed structure; the two hot side interfaces of the to-be-tested plate heat exchanger are a hot side water supply interface and a hot side return water interface respectively; the inner circulation water supply temperature meter is installed close to the hot side water supply interface; and the inner circulation return water temperature meter is installed close to the hot side return water interface.

3. The method of claim 1, wherein The outer circulation pipeline system comprises an outer circulation pipeline, and an outer circulation water pump, an outer circulation water supply temperature meter, an outer circulation return water temperature meter and an outer circulation flow meter installed on the outer circulation pipeline; the two cold side interfaces of the to-be-tested plate heat exchanger are a cold side water supply interface and a cold side return water interface respectively; the outer circulation water supply temperature meter is installed close to the cold side water supply interface, and the outer circulation return water temperature meter is installed close to the cold side return water interface; the outer circulation pipeline is of an open structure, and its open end is connected to the heat dissipating device.

4. A test method for testing the heat transfer coefficient of a plate heat exchanger according to claim 3, characterized in that, The heat dissipating device comprises a cooling tower, a spray head and a cooling fan; the open end of the outer circulation pipeline is a water supply end and a return water end respectively, the water supply end of which is inserted into fluid medium in the cooling tower, and the return water end is installed with the spray head; and the cooling fan is installed close to the spray head, and is used for evaporative heat dissipation of fluid medium sprayed by the spray head.

5. The method of claim 1, wherein The heat generating device comprises a plurality of electrical heating devices.

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