Hot water (0.01 m3 /min) enters the tube side of a counter current shell and tube heat exchanger at 80°C and leaves at 50°C. Cold oil (0.05 m3/min) of density 800 kg/m3 and specific heat of 2 kJ/kg.K enters at 20°C. The log mean temperature difference in °C is approximately ?

Related Mcqs:

For a laminar flow of fluid in a circular tube, ‘h1’ is the convective heat transfer co-efficient at velocity ‘V1’. If the velocity is reduced by half and assuming the fluid properties are constant, the new convective heat transfer co-efficient is________________?

A. 1.26 h1 B. 0.794 h1 C. 0.574 h1 D. 1.741 h1...

Multiple effect evaporation accounts for___________________?

A. Steam economy B. Lower operating costs C. Investment economy D. None of these...

With increase in temperature, the thermal conductivity of fresh lubricating oil ___________________?

A. Increases B. Decreases C. Remains unchanged D. May increase or decrease; depends on its composition...

Heat transfer by conduction results due to the transfer of free electrons, kinetic energy & vibrational energy from one molecule to another. Conduction heat transfer cannot take place____________________?

A. Between two bodies in physical contact with each other B. Between two bodies not in physical contact with each other C. From one part of a body to the another part of the same body D. Both B & C...

For what value of Prandtl number, the Col-burn analogy is valid ?

A. 0.06 to 120 B. 0.6 to 120 C. 1 to 103 D. 1 to 50...