Out of the Following Four Assumptions Used in the Derivation

question 19

Multiple Choice

Out of the following four assumptions used in the derivation of the equation for LMTD [LMTD = (?t1 - ?t2) /ln(?t1/?t2) ], which one is subject to the largest deviation in practice ?

• A)Constant overall heat transfer co-efficient.
• B)Constant rate of fluid flow
• C)Constant specific heat
• D)No partial phase change in the system

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