Select from the list below, the assumption NOT made in the development of the LM

ID: 1842441 • Letter: S

Question

Select from the list below, the assumption NOT made in the development of the LMTD method applied to a parallel flow heat exchanger. Constant values of specific heat capacities. No heat loss to the surroundings. Heat only transferred between the working fluids. Constant overall heat transfer coefficient. Fluid properties are assumed to be the bulk average values. I.e. not temperature gradients within the working fluids. The hot fluid has a greater heat capacity than the cold fluid and hence will experience a smaller temperature change. Steady state operation, i.e. no time dependent effects due to heat storage within the heat exchanger structure or variation in fluid inlet temperatures.

Explanation / Answer

All the assumptions are valid except "The hot fluid has a greater heat capacity than the cold fluid and hence will experience a smaller temperature change".

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Select from the list below, the assumption NOT made in the development of the LM

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