A system that transmits the heat energy of a high-temperature fluid to a low temperature one. It is used for heater, cooler, vaporizer, condenser etc. Air or liquid is used as fluid and sometimes solid and fluid are used at the same time. There are three types: a diaphragm type which has a diaphragm between two fluids, an accumulative (regenerative) type that delivers heat by using a heat accumulator, and a direct contact type in which two fluids are in direct contact. Because two fluids are completely separate in the diaphragm type, it is used in the chemical industry, or the food processing industry which must avoid mixing of fluids or for a boiler that is heated with combustion flue gas. A metal pipe is used as a heat plate and double or multiple pipe type (or shell and tube type) is widely used.
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