Consider a parallel flow heat exchanger which is used to cool oil from 70 c to 40 c using water available at 30 c the outlet temperature of the water is 36 c. The overall heat transfer coefficient u 200 w m 2 k. The logarithmic mean temperature difference also known as log mean temperature difference lmtd is used to determine the temperature driving force for heat transfer in flow systems most notably in heat exchangers the lmtd is a logarithmic average of the temperature difference between the hot and cold feeds at each end of the double pipe exchanger.
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