【Mechanical Equipment Technology Exchange Edition】Mechanical Equipment 【Daily Question】20190905
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Question: How to reduce heat transfer? There are no answers provided for this series of posts; fellow netizens are free to share their own opinions – just reply with what you understand. Replies earn rewards ranging from 5 to 15 points; all forum members are welcome to participate actively and support the development of the forum! ! ! There were a lot of things going on at the factory recently, related to chemical equipment and machinery
Materials with a lower thermal conductivity are used to increase the thermal conduction resistance
Reducing heat transfer is primarily achieved through the heat conduction process, with the main approach being to decrease the thermal conductivity of the material (by using thermal insulation materials). Other methods are generally used as supplements: reducing the heat exchange area ； For convective heat transfer, the flow pattern can be altered, the heat transfer surface can be made smooth, and disturbances in the thermal boundary layer can be prevented in order to reduce the Nu number ； For radiative heat transfer, the arrangement of the heated surfaces can be changed to reduce the corner factor, and high-reflectivity coatings can be applied to the heated surfaces
Heat transfer methods include conduction, convection, and radiation. Reducing heat transfer is achieved mainly by decreasing the heat exchange area and the thermal conductivity of the material (by using thermal insulation materials)； Change the flow pattern, smooth the heat transfer surface, and prevent disturbances in the thermal boundary layer in order to reduce the Nu number ； Changing the arrangement of the heating surfaces, reducing the corner coefficient, and applying coatings with high reflectivity to the heating surfaces, etc.
Insulation measures involving the use of insulating materials around hot and cold equipment, altering the radiation properties of the surfaces, and adding elements to suppress convection
Use materials with a low thermal conductivity as insulation layers to increase the thermal conduction resistance； Use a warm version to reduce radiation heat transfer.
Reducing heat transfer is primarily achieved through the heat conduction process, with the main approach being to decrease the thermal conductivity of the material (by using thermal insulation materials). Other methods are generally used as supplements: reducing the heat exchange area ； For convective heat transfer, the flow pattern can be altered, the heat transfer surface can be made smooth, and disturbances in the thermal boundary layer can be prevented in order to reduce the Nu number ； For radiative heat transfer, the arrangement of the heated surfaces can be changed to reduce the corner factor, and high-reflectivity coatings can be applied to the heated surfaces
Insulation measures involving the use of insulating materials to cover hot and cold equipment. Make the casing of heat-generating devices into a vacuum insulation layer to alter the surface’s radiation properties; add elements that suppress convection, such as applying hydrophobic agents on or inside the insulation material.
Insulation measures involving the use of insulating materials to cover hot and cold equipment.
Insulation measures involving the use of insulating materials around hot and cold equipment； The enclosure of the heating device is made with a vacuum insulation layer ； Change the radiation properties of the surface ； Elements added to suppress convection.
Reducing heat transfer is primarily achieved through the heat conduction process, with the main approach being to decrease the thermal conductivity of the material (by using thermal insulation materials). Other methods are generally used as supplements: reducing the heat exchange area ； For convective heat transfer, the flow pattern can be altered, the heat transfer surface can be made smooth, and disturbances in the thermal boundary layer can be prevented in order to reduce the Nu number ； For radiative heat transfer, the arrangement of the heated surfaces can be changed to reduce the corner factor, and high-reflectivity coatings can be applied to the heated surfaces