Thursday, December 11, 2014
Wednesday, July 23, 2014
Heat Exchanger Design
Heat exchangers are any devices designed to perform heat transfers, and include refrigerators, swamp coolers, or radiators. Heat exchangers
work by transferring thermal energy from one liquid to another through a separator or by direct contact. These devices can either be used to direct heat transfers towards an object, as in refrigeration, or away, as in radiators. Because of the various applications of heat exchangers, various designs exist.
work by transferring thermal energy from one liquid to another through a separator or by direct contact. These devices can either be used to direct heat transfers towards an object, as in refrigeration, or away, as in radiators. Because of the various applications of heat exchangers, various designs exist.
Basic Heat Exchanger Principles
The basics of heat transfer involve the second law of thermodynamics, which basically states that two thermodynamic systems, when allowed to interact, will move towards a thermodynamic equilibrium. In other words, when hot and cold substances are brought into contact with one another, the hot substance will cool and the cool substance will heat up, resulting in a median temperature.
Tuesday, July 15, 2014
TRADITIONAL PLATE EXCHANGER CALCULATION
Water properties are taken at average temperatures. As the hot and cold inlet temperatures are 80 and 20 degrees Centigrade, respectively, the average temperature is 50 degree C. The film correction for the heat transfer coefficient is neglected for the hand calculation. It is small and of opposite influence at each process side. |
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