Counter Flow Heat Exchanger Lmtd

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. For a given heat exchanger with constant. Q is the overall heat transfer rate across a given heat exchanger in watts u is the overall heat transfer coefficient for that exchanger a overall is the overall effective heat transfer area between the hot and cold sides of the exchanger lmtd is the logarithmic mean of temperature differences as discussed above.

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