Gas-liquid surface heat exchanger and thermal management system based on gas-liquid surface heat exchanger

Abstract

The invention provides a gas-liquid surface heat exchanger and a heat management system based on the gas-liquid surface heat exchanger, and belongs to the technical field of heat exchangers. According to the gas-liquid surface heat exchanger, a cavity is formed between an upper substrate and a lower substrate, the cavity formed between the upper substrate and the lower substrate is a liquid flow channel, graphene aerogel composite phase change materials arranged in an array mode are arranged in the liquid flow channel, and at least one liquid inlet and at least one liquid outlet are formed in the two ends of the liquid flow channel correspondingly. And gas is arranged on the outer side of the upper substrate. Liquid flows into the liquid flow channel from an inlet of the liquid flow channel, heat in the liquid flow channel is transferred to gas on the outer side of the upper substrate through the upper substrate and the graphene aerogel composite phase change material, and the liquid flows out of the liquid flow channel from a liquid outlet. The problems that in the prior art, a gas-liquid surface heat exchanger is low in enhanced heat exchange benefit and not suitable for variable working conditions are solved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of heat exchangers, and particularly relates to a gas-liquid surface heat exchanger and a heat management system based on the gas-liquid surface heat exchanger. BACKGROUND

[0002] The surface heat exchanger and the heat management system thereof have attracted extensive attention from the industry and academia because the surface heat exchanger can transport the waste heat generated by the electronic components and high-energy devices in the circulating cooling liquid to the ambient air by using the inherent surface of the high-speed carrier, thereby effectively avoiding the mass and size loss caused by the additional heat exchange structure.

[0003] At present, the heat load of the electronic components and high-energy devices in the high-speed carrier is continuously increasing, and higher demands are put forward for the overall heat exchange efficiency of the surface heat exchanger. However, the current surface heat exchanger has been difficult to provide sufficient cooling power for the electronic components and high-energy devices in the future high-speed carrier. As a kind of gas-liquid heat exchanger, the overall heat exchange efficiency of the surface heat exchanger is determined by the gas side. However, compared with the liquid, the heat exchange characteristics of the gas are poor. For example, the traditional heat exchange enhancement technologies such as adding fin structures and changing the flow state of the fluid are mainly carried out for the high thermal resistance link in the heat exchange process of the heat exchanger. However, the surface heat exchanger needs to be combined with the shape design of the high-speed carrier, and the gas side working medium is the ambient air. Therefore, the structure and operating conditions of the main thermal resistance side of the surface heat exchanger, i.e. the gas side, limit the application of the traditional heat exchange enhancement technologies. Moreover, the heat exchange enhancement effect of the traditional heat exchange enhancement technologies for the secondary thermal resistance side of the surface heat exchanger, i.e. the liquid side, is not significant.

[0004] In addition, the surface heat exchanger and the heat management system based on the surface heat exchanger are often not applicable to the variable operating conditions of the high-speed carrier and the variable heat load conditions of the electronic components and high-energy devices. However, the surface heat exchanger and the heat management system thereof that can respond to the variable operating conditions of the high-speed carrier and the instantaneous peak of the heat load of the electronic components and high-energy devices are extremely complex. SUMMARY

[0005] The purpose of the present application is to provide a gas-liquid surface heat exchanger and a heat management system based on the gas-liquid surface heat exchanger, which can solve the problem of low heat exchange enhancement benefit and inapplicability to variable conditions of the gas-liquid surface heat exchanger in the prior art.

[0006] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows: In a first aspect, the present application provides a gas-liquid surface heat exchanger, which comprises an upper substrate and a lower substrate, a cavity is formed between the upper substrate and the lower substrate, the cavity formed between the upper substrate and the lower substrate is a liquid flow channel, an array of graphene aerogel composite phase change materials is arranged in the liquid flow channel, at least one liquid inlet and at least one liquid outlet are arranged at both ends of the liquid flow channel respectively, and the outer side of the upper substrate is a gas. Liquid flows into the liquid channel from the liquid inlet, and in the liquid channel, the liquid transfers heat to the gas outside the upper substrate through the upper substrate and the graphene aerogel composite phase change material, and the liquid flows out of the liquid channel from the liquid outlet.

[0007] The application further improves by further comprising an inlet header and an outlet header, the inlet header is arranged at one end of the liquid channel and communicates with the liquid channel, and at least one liquid inlet is arranged on the inlet header; the outlet header is arranged at the other end of the liquid channel and communicates with the liquid channel, and at least one liquid outlet is arranged on the outlet header.

[0008] The application further improves by that the upper substrate has the same shape as the outer contour of the high-speed vehicle.

[0009] The application further improves by that the high-speed vehicle is a Formula One racing car.

[0010] The application further improves by that the lower substrate is made of heat insulation material or is wrapped with heat insulation material outside.

[0011] The application further improves by that the liquid channel further comprises a support structure connecting the upper substrate and the lower substrate. The application further improves by that the fluid flow mode of the gas-liquid surface heat exchanger is counter flow or mixed flow.

[0012] The application further improves by that the liquid is fluorinated liquid or silicon oil.

[0013] The application further improves by that the graphene aerogel composite phase change material is made of graphene aerogel and phase change material paraffin.

[0014] In the second aspect, the application provides a heat management system based on the above-mentioned gas-liquid surface heat exchanger, comprising a gas-liquid surface heat exchanger, a pipeline, a liquid storage tank, a pump and a cooling assembly, the pipeline sequentially communicates the cooling assembly, the gas-liquid surface heat exchanger, the liquid storage tank and the pump. The cooling assembly is used for cooling electronic components and high-energy devices carried by the high-speed vehicle, and the cooling assembly comprises at least one liquid cooling plate, and each liquid cooling plate comprises at least one liquid loop. The liquid inlet of the gas-liquid surface heat exchanger is connected to the outlet end of the liquid loop in the cooling assembly through the pipeline, and is used for cooling liquid. The inlet end of the liquid storage tank is connected to the liquid outlet of the gas-liquid surface heat exchanger through the pipeline, and is used for storing cooled liquid. The inlet end and the outlet end of the pump are connected to the outlet end of the liquid storage tank and the inlet end of the liquid loop in the cooling assembly respectively through the pipelines, so as to deliver the cooled liquid stored in the liquid storage tank to the cooling assembly.

[0015] Compared with the prior art, the present application has the following beneficial effects: On the one hand, the gas-liquid surface heat exchanger utilizes the high latent heat constant-temperature phase change process of the graphene aerogel composite phase change material, so that the heat exchange temperature difference of the gas-liquid surface heat exchanger can be maintained at a high level for a long time and serves as an additional heat sink in the liquid flow channel of the gas-liquid surface heat exchanger, thereby avoiding the limitation of the structure and operating conditions of the gas side, which is the main heat resistance side of the gas-liquid surface heat exchanger, on the heat exchange enhancement, effectively improving the heat exchange efficiency of the gas-liquid surface heat exchanger, and further solving the problem of low benefit of using traditional heat exchange enhancement technology for the gas-liquid surface heat exchanger.

[0016] On the other hand, the graphene aerogel composite phase change material only melts when the heat exchange condition of the gas-liquid surface heat exchanger is poor and the thermal load of electronic components and high-energy equipment is high, so that the efficiency of the gas-liquid surface heat exchanger and the heat management system based on the gas-liquid surface heat exchanger can be adaptively adjusted, and the problem that the traditional gas-liquid surface heat exchanger and the heat management system thereof are not suitable for variable working conditions is solved.

[0017] In addition, the graphene aerogel composite phase change material has low density, so that the gas-liquid surface heat exchanger and the heat management system thereof using the graphene aerogel composite phase change material are more lightweight than the existing gas-liquid surface heat exchanger and the heat management system thereof. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the gas-liquid surface heat exchanger embodiment of the present application; Figure 2 It is a schematic diagram of the heat management system based on the gas-liquid surface heat exchanger of the present application; In the figure: 1, liquid inlet; 2, inlet header; 3, graphene aerogel composite phase change material; 4, liquid flow channel; 5, pin column; 6, lower base plate; 7, liquid outlet; 8, high-speed carrier; 9, outlet header; 10, upper base plate; 11, gas-liquid surface heat exchanger; 12, pipeline; 13, liquid storage tank; 14, pump; 15, cooling assembly. DETAILED DESCRIPTION

[0019] In order to further understand the content of the present application, the present application will be described in detail below in combination with the drawings and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments.

[0020] The gas-liquid surface heat exchanger and the heat management system thereof of the present application effectively solve the problems of low heat exchange enhancement benefit and unsuitability for variable working conditions of the gas-liquid surface heat exchanger in the prior art.

[0021] Embodiment one: Referring to Figure 1 The embodiment discloses a gas-liquid surface heat exchanger, which comprises an upper substrate 10 and a lower substrate 6, a cavity is formed between the upper substrate 10 and the lower substrate 6, the cavity formed between the upper substrate 10 and the lower substrate 6 is a liquid flow channel 4, an array of graphene aerogel composite phase change materials 3 is arranged in the liquid flow channel 4, and the outside of the upper substrate 10 is a gas, and the gas outside the upper substrate 10 in the embodiment is ambient air.

[0022] The gas-liquid surface heat exchanger disclosed by the embodiment further comprises an inlet header 2 and an outlet header 9, the inlet header 2 is arranged at one end of the liquid flow channel 4 and communicates with the liquid flow channel 4, and one liquid inlet 1 is arranged on the inlet header 2 in the embodiment; the outlet header 9 is arranged at the other end of the liquid flow channel 4 and communicates with the liquid flow channel 4, and one liquid outlet 6 is arranged on the outlet header 9 in the embodiment.

[0023] The upper substrate 10 in the embodiment has the same shape as the outer contour of the high-speed carrier 8.

[0024] The lower substrate 6 in the embodiment is made of a heat-insulating material, so that heat of the liquid in the liquid flow channel 4 can be prevented from being transmitted to the inside of the body of the high-speed carrier 8 through the lower substrate 6.

[0025] The support structure connecting the upper substrate 10 and the lower substrate 6 is further arranged in the liquid flow channel 4 in the embodiment, which is used to provide a supporting force to the upper substrate 10 and the lower substrate 6, so that the upper substrate 10 and the lower substrate 6 have the ability to keep the profile. The support structure in the embodiment is a nail column 5, and other structures similar to the nail column 5 are also applicable. In addition, the nail column 5 can also be used to strengthen the flow disturbance in the liquid flow channel 4, so as to improve the overall heat exchange efficiency of the gas-liquid surface heat exchanger.

[0026] The fluid flow mode of the gas-liquid surface heat exchanger in the embodiment is countercurrent, that is, the flow directions of the liquid in the liquid flow channel 4 and the ambient air outside the upper substrate 10 are opposite.

[0027] The liquid in the embodiment is fluorinated liquid FC-770.

[0028] The graphene aerogel composite phase change material 3 in the embodiment is made of graphene aerogel and phase change material paraffin, the high-efficiency heat conduction path and high capillary force provided by the rich pore structure of the graphene aerogel improve the thermal conductivity of the phase change material paraffin and bind the melted phase change material paraffin in the pore structure of the graphene aerogel. Because the graphene aerogel composite phase change material 3 has excellent shape stability before and after the phase change process, it can be equivalent to a fin-like structure in the liquid flow channel 4 to strengthen the flow disturbance in the liquid flow channel 4, so as to improve the overall heat exchange efficiency of the gas-liquid surface heat exchanger.

[0029] The high-speed vehicle 8 of the embodiment is a Formula One racing car, and other high-speed vehicles similar to the Formula One racing car are also applicable.

[0030] The specific working principle of the gas-liquid surface heat exchanger of the embodiment is described as follows: When the thermal load of the electronic components and high-energy devices in the Formula One racing car is low or the driving speed of the Formula One racing car is high, on the one hand, the waste heat generated by the electronic components and high-energy devices is small; on the other hand, the high flow speed makes the heat exchange condition of the gas-liquid surface heat exchanger good, so the temperature of the fluorinated liquid FC-770 is lower than the melting point of the graphene aerogel composite phase change material 3. At this time, the fluorinated liquid FC-770 flows into the liquid flow channel 4 from the liquid inlet 1 through the inlet header 2, and the fluorinated liquid FC-770 unidirectionally flows in the liquid flow channel 4 while transferring the waste heat generated by the electronic components and high-energy devices carried by the fluorinated liquid FC-770 to the ambient air outside the upper substrate 10 through the upper substrate 10, and then the fluorinated liquid FC-770 flows out of the liquid flow channel 4 through the liquid outlet 6 via the outlet header 9.

[0031] When the thermal load of the electronic components and high-energy devices in the Formula One racing car is high or the driving speed of the Formula One racing car is low, on the one hand, the waste heat generated by the electronic components and high-energy devices is large; on the other hand, the low flow speed makes the heat exchange condition of the gas-liquid surface heat exchanger poor, so the temperature of the fluorinated liquid FC-770 is higher than the melting point of the graphene aerogel composite phase change material 3. At this time, the fluorinated liquid FC-770 flows into the liquid flow channel 4 from the liquid inlet 1 through the inlet header 2, and the fluorinated liquid FC-770 unidirectionally flows in the liquid flow channel 4 while transferring the waste heat generated by the electronic components and high-energy devices carried by the fluorinated liquid FC-770 to the ambient air outside the upper substrate 10 through the upper substrate 10 on the one hand, and to the graphene aerogel composite phase change material 3 on the other hand, and then the fluorinated liquid FC-770 flows out of the liquid flow channel 4 through the liquid outlet 6 via the outlet header 9. At the same time, the heat absorbed by the graphene aerogel composite phase change material 3 due to phase change melting is also transferred to the ambient air outside the upper substrate 10 through the upper substrate 10.

[0032] Embodiment two: Referring to Figure 2 The embodiment discloses a heat management system based on a gas-liquid surface heat exchanger, the core component of which is the gas-liquid surface heat exchanger 11 described above, and the direction of the black arrow is the flow direction of the liquid. The technical scheme of the embodiment is described as follows: The heat management system based on the gas-liquid surface heat exchanger disclosed by the embodiment comprises the gas-liquid surface heat exchanger 11, the pipeline 12, the liquid storage tank 13, the pump 14, and the cooling assembly 15. The pipeline 12 sequentially communicates the cooling assembly 15, the gas-liquid surface heat exchanger 11, the liquid storage tank 13, and the pump 14.

[0033] The cooling assembly 15 is used to cool the electronic components and high-energy devices carried by the Formula One racing car. The cooling assembly 15 comprises at least one liquid cooling plate, and one liquid cooling plate is arranged in the embodiment. Each liquid cooling plate comprises at least one liquid loop, and one liquid loop is arranged in the embodiment.

[0034] The liquid inlet 1 of the gas-liquid surface heat exchanger 11 is connected to the outlet end of the liquid loop in the cooling assembly 15 through the pipeline 12, and is used to cool the liquid.

[0035] The inlet end of the liquid storage tank 13 is connected to the liquid outlet 7 of the gas-liquid surface heat exchanger 11 through the pipeline 12, and is used to store the cooled liquid.

[0036] The inlet end and the outlet end of the pump 14 are respectively connected to the outlet end of the liquid storage tank 13 and the inlet end of the liquid loop in the cooling assembly 15 through the pipeline 12, and are used to pump the cooled liquid stored in the liquid storage tank 13 to the cooling assembly 15.

[0037] The gas-liquid surface heat exchanger 11 in the embodiment is the same as the gas-liquid surface heat exchanger in the embodiment one.

[0038] The specific working principle of the heat management system based on the gas-liquid surface heat exchanger in the embodiment is described as follows: The fluorinated liquid FC-770 flows in the liquid loop in the cooling assembly 15, absorbs the waste heat generated by the electronic components and high-energy devices carried by the Formula One racing car, and then enters the gas-liquid surface heat exchanger 11 through the pipeline 12 after the temperature is increased. The fluorinated liquid FC-770 in the liquid flow channel 4 of the gas-liquid surface heat exchanger 11 transmits the waste heat generated by the electronic components and high-energy devices to the ambient air outside the upper substrate 10 through the upper substrate 10 and the graphene aerogel composite phase change material 3, and then enters the liquid storage tank 13 through the pipeline 12 after the temperature is decreased. Part of the fluorinated liquid FC-770 in the liquid storage tank 13 enters the liquid loop in the cooling assembly 15 through the pipeline 12 again, so as to continue to cool the electronic components and high-energy devices carried by the Formula One racing car.

[0039] It should be understood that some technical terms involved in the description of the present application, such as "upper", "lower", "two ends" and "outer side", indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the indicated device or element must have a specific orientation, and therefore cannot be understood as a limitation on the protection scope of the present application.

[0040] It should be pointed out finally that the above embodiments are only used to illustrate the technical solutions of the present application but not to limit it. Although the present application has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the specific embodiments of the present application can be modified or replaced equivalently without departing from the spirit and scope of the present application, and any modification or equivalent replacement without departing from the spirit and scope of the present application should be covered in the protection scope of the claims of the present application.

Claims

1. A gas-liquid surface heat exchanger, characterized in that, It includes an upper substrate (10) and a lower substrate (6), a cavity is formed between the upper substrate (10) and the lower substrate (6), the cavity formed between the upper substrate (10) and the lower substrate (6) is a liquid channel (4), an array of graphene aerogel composite phase change material (3) is disposed in the liquid channel (4), at least one liquid inlet (1) and at least one liquid outlet (7) are respectively provided at both ends of the liquid channel (4), and the outside of the upper substrate (10) is gas; Liquid flows into the liquid channel (4) from the liquid inlet (1). In the liquid channel (4), the liquid transfers heat through the upper substrate (10) and the graphene aerogel composite phase change material (3) to the gas outside the upper substrate (10). The liquid flows out of the liquid channel (4) from the liquid outlet (7).

2. The gas-liquid surface heat exchanger according to claim 1, characterized in that, It also includes an inlet header (2) and an outlet header (9). The inlet header (2) is located at one end of the liquid flow channel (4) and is connected to the liquid flow channel (4). The inlet header (2) is provided with at least one liquid inlet (1). The outlet header (9) is located at the other end of the liquid flow channel (4) and is connected to the liquid flow channel (4). The outlet header (9) is provided with at least one liquid outlet (7).

3. The gas-liquid surface heat exchanger according to claim 1, characterized in that, The upper substrate (10) has the same shape as the outer contour of the high-speed vehicle (8).

4. The gas-liquid surface heat exchanger according to claim 3, characterized in that, The high-speed vehicle (8) is a Formula One race car.

5. The gas-liquid surface heat exchanger according to claim 1, characterized in that, The lower substrate (6) is made of heat-insulating material or the lower substrate (6) is wrapped with heat-insulating material on the outside.

6. The gas-liquid surface heat exchanger according to claim 1, characterized in that, The liquid flow channel (4) is also provided with a support structure that connects the upper substrate (10) and the lower substrate (6).

7. The gas-liquid surface heat exchanger according to claim 1, characterized in that, The fluid flow mode of the gas-liquid surface heat exchanger is countercurrent or mixed flow.

8. The gas-liquid surface heat exchanger according to claim 1, characterized in that, The liquid is a fluorinated liquid or silicone oil.

9. The gas-liquid surface heat exchanger according to claim 1, characterized in that, The graphene aerogel composite phase change material (3) is made of graphene aerogel and phase change material paraffin.

10. A thermal management system based on a gas-liquid surface heat exchanger as described in any one of claims 1-9, characterized in that, It includes a gas-liquid surface heat exchanger (11), a pipeline (12), a liquid storage tank (13), a pump (14), and a cooling assembly (15). The pipeline (12) is connected in sequence to the cooling assembly (15), the gas-liquid surface heat exchanger (11), the liquid storage tank (13), and the pump (14). The cooling assembly (15) is used to cool the electronic components and high-energy equipment carried by the high-speed vehicle (8). The cooling assembly (15) includes at least one liquid cooling plate, and each liquid cooling plate includes at least one liquid circuit. The liquid inlet (1) of the gas-liquid surface heat exchanger (11) is connected to the outlet end of the liquid circuit in the cooling assembly (15) through the pipeline (12) for cooling liquid; The inlet end of the liquid storage tank (13) is connected to the liquid outlet (7) of the gas-liquid surface heat exchanger (11) through the pipeline (12) for storing the cooled liquid; The inlet and outlet of the pump (14) are connected to the outlet of the liquid storage tank (13) and the inlet of the liquid circuit in the cooling assembly (15) through the pipeline (12), respectively, for conveying the cooled liquid stored in the liquid storage tank (13) to the cooling assembly (15).

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