Heat Transfer
Air is best heated with steam in a heat exchanger of

plate type
shell and tube type
double pipe type with fin on steam side
double pipe type with fin on air side

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Heat Transfer
Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer across an equal area held at the

Temperature of the fin end
Surrounding temperature
Constant temperature equal to that of the base
Average temperature of the fin

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