A/L Physics | Past Paper Question | 2007 GCE A/L 59th MCQ | Physics Explanation Tamil

A/L Physics | Past Paper Question | 2007 GCE A/L 59th MCQ | Physics Explanation Tamil

A heat exchanger is a system used to transfer heat between two or more fluids. Heat exchangers are used in both cooling and heating processes. The fluids may be separated by a solid wall to prevent mixing or they may be in direct contact. They are widely used in space heating, refrigeration, air conditioning, power stations, chemical plants, petrochemical plants, petroleum refineries, natural-gas processing, and sewage treatment. The classic example of a heat exchanger is found in an internal combustion engine in which a circulating fluid known as engine coolant flows through radiator coils and air flows past the coils, which cools the coolant and heats the incoming air. Another example is the heat sink, which is a passive heat exchanger that transfers the heat generated by an electronic or a mechanical device to a fluid medium, often air or a liquid coolant. The heat exchange between two objects is proportional to the difference of their temperatures. For the process of heat loss, internal heat has to be transported from the various tissues and organs to the cooler body surface. Heat transfer from the body core to the shell is called internal heat transport. Heat exchangers are used to transfer heat from one medium to another. These media may be a gas, liquid, or a combination of both. The media may be separated by a solid wall to prevent mixing or may be in direct contact. Plate exchanger is the most efficient due to turbulent flow on both sides. High heat-transfer coefficient and high turbulence due to even flow distribution are important. However, a plate heat exchanger regenerator is restricted to low viscosities. Plate exchangers fulfill these requirements best

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