Tag: EFFECTIVENESS
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RR-6 The Second Law Efficiency of Process Heat Exchangers
April 12, 2024
An efficiency is defined for process heat exchangers using the second law of thermodynamics. This parameter accounts for the unavoidable sources of irreversibility in a real heat exchanger—e.g., heat transfer over a finite temperature difference and flow friction. Its definition is based on the destruction of flow availability, which is a function of the...
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Is My Design OK? The Challenges of High Effectiveness Exchangers
June 14, 2018
Temperature effectiveness is the change in process fluid stream temperature divided by the difference between the hottest and coldest temperatures in the exchanger. If the required effectiveness is greater than 0.8, non-ideal fabrication or variable process conditions can significantly reduce performance of many exchanger types (shell-and-tube, plate-frame, plate-fin, etc.). Learn about...
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