Counter Flow Heat Exchanger Lmtd

Or perpendicular to each other cross flow. The overall measure of heat transfer driving force the log mean temperature difference is greater for counter flow so the heat exchanger surface area requirement will be larger than for a counter flow heat exchanger with the same inlet and outlet temperatures for the hot and the cold fluid. 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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