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Overall Heat Transfer Coefficient HMT Tutorial- 26, Heat and Mass Transfer, Mechanical Engineering Video Lecture | Topper Handwritten Notes & Videos for GATE ME

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FAQs on Overall Heat Transfer Coefficient HMT Tutorial- 26, Heat and Mass Transfer, Mechanical Engineering Video Lecture - Topper Handwritten Notes & Videos for GATE ME

1. What is the overall heat transfer coefficient?
Ans. The overall heat transfer coefficient, also known as U-value, is a measure of the ability of a material or system to conduct heat. It is the reciprocal of the total thermal resistance and represents the combined effect of all heat transfer mechanisms, including conduction, convection, and radiation.
2. How is the overall heat transfer coefficient calculated?
Ans. The overall heat transfer coefficient can be calculated using the following formula: U = 1 / (1 / h_conv + R_cond + 1 / h_rad), where h_conv is the convective heat transfer coefficient, R_cond is the thermal resistance due to conduction, and h_rad is the radiative heat transfer coefficient.
3. What factors affect the overall heat transfer coefficient?
Ans. Several factors can affect the overall heat transfer coefficient, including the type of material or fluid being used, the surface area of heat transfer, the thickness of the material, the temperature difference between the hot and cold sides, and the presence of any insulation or other barriers.
4. How can the overall heat transfer coefficient be improved?
Ans. The overall heat transfer coefficient can be improved by increasing the convective heat transfer coefficient through methods such as increasing fluid velocity or using fins, reducing the thermal resistance due to conduction by using materials with higher thermal conductivity, and increasing the radiative heat transfer coefficient by using materials with higher emissivity or reflective surfaces.
5. What is the significance of the overall heat transfer coefficient in engineering applications?
Ans. The overall heat transfer coefficient is an important parameter in engineering applications as it helps in determining the rate of heat transfer through a material or system. It is used in the design and analysis of heat exchangers, boilers, refrigeration systems, and various other thermal processes. By understanding and optimizing the overall heat transfer coefficient, engineers can ensure efficient and effective heat transfer in their designs.
59 videos|204 docs
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