Heat Transfer
LMTD for counterflow and prallel flow heat exchanger will be the same, when the

Cold fluid is heated to a certain temperature by condensing steam (isothermal fluid)
None of these
Outlet temperature of hot fluid is less than the outlet temperature of the cold fluid
Outlent temperature of both the hot and cold fluid are same

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Heat Transfer
Condensing film co-efficient for steam on horizontal tubes ranges from 5000 to 15000 Kcal/hr.m² .°C. Condensation of vapor is carried out inside the tube in a shell and tube heat exchanger, when the

Temperature of the incoming vapor is very high
Higher condensing film co-efficient is desired
Condensate is corrosive in nature
Lower pressure drop through the exchanger is desired

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