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1. What is heat transfer and why is it important in engineering?
Ans. Heat transfer is the process of transferring thermal energy from one object or substance to another. It is an important concept in engineering because it helps in understanding how heat is transferred in various systems and how to design efficient thermal management systems.
2. What are the three modes of heat transfer?
Ans. The three modes of heat transfer are conduction, convection, and radiation. Conduction is the transfer of heat through direct contact between solids. Convection is the transfer of heat through the movement of fluids (liquids or gases). Radiation is the transfer of heat through electromagnetic waves.
3. How does insulation affect heat transfer?
Ans. Insulation reduces heat transfer by minimizing the flow of heat energy between two objects with different temperatures. It acts as a barrier that slows down the conduction, convection, and radiation processes, thereby reducing heat loss or gain.
4. What is a heat exchanger and how does it work?
Ans. A heat exchanger is a device used to efficiently transfer heat from one fluid to another. It consists of two fluid streams that are separated by a solid wall. Heat is transferred from the hot fluid to the cold fluid through conduction, convection, or radiation, depending on the design of the heat exchanger.
5. What factors affect the rate of heat transfer?
Ans. Several factors affect the rate of heat transfer, including the temperature difference between the two objects, the surface area available for heat transfer, the thermal conductivity of the materials involved, the distance between the objects, and the presence of any insulating materials. These factors determine the efficiency and effectiveness of heat transfer in a system.
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