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General Knowledge of Heat Exchanger
Jul 25, 2017

Heat must be transferred from one place to another or from one fluid to another in most of chemical, electronic, or mechanical system. Heat exchangers are used to transfer heat from one fluid to another. A basic understanding of the mechanical components of a heat exchanger is important to understanding how they function and operate.

Heat exchanger allows the transfer of heat from one   fluid (liquid or gas) to another fluid. Principles for heat transfer include   the following:

1. To heat a cooler fluid by means of a hotter fluid.

2. To reduce the temperature of a hot fluid by means of   a cooler fluid.

3. To boil a liquid by means of a hotter fluid.

4. To condense a gaseous fluid by means of a cooler   fluid.

5. To boil a liquid while condensing a hotter gaseous   fluid.

Regardless of the function the heat exchanger fulfills,   the fluids involved must be at different temperatures and they must conduct   thermal contact. Heat can flow only from the hotter to the cooler fluid.

There is no direct contact between the two fluids in a   heat exchanger. The heat is transferred from the hot fluid to the metal   isolating the two fluids and then to the cooler fluid.