In the case of a shell and tube heat exchanger, the logarithmic mean temperature difference ______________________?

A. Is always more than arithmetic mean value and the geometric mean value

B. Is always less than arithmetic average value

C. Is always less than arithmetic mean value, but more than geometric mean value

D. May be either more or less than geometric mean and arithmetic mean value depending upon

E. ther the flow of stream is co-current or counter-current

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