Why we use LMTD to calculate overall heat transfer co efficient in shell and tube than arithmetic average?
In a heat exchanger the heat being lost by the hot fluid as well as the heat gained by the cold fluid is not linear. So we need to use logarithmic average than arithmetic average to calculate correct value of overall heat transfer co efficient.
In a heat exchanger the heat being lost by the hot fluid as well as the heat gained by the cold fluid is not linear. So we need to use logarithmic average than arithmetic average to calculate correct value of overall heat transfer co efficient.
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