Use of arithmetic mean temperature difference instead of LMTD - Heat Transfer

Q.  When is the arithmetic mean temperature difference of heat exchanger used instead of LMTD?
- Published on 12 Aug 15

a. when the temperature profiles of two fluids of heat exchanger are sloping downward with curve
b. when the temperature profiles of two fluids of heat exchanger are sloping upward with curve
c. when the temperature profiles of two fluids of heat exchanger are straight
d. none of the above

ANSWER: when the temperature profiles of two fluids of heat exchanger are straight

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