Heat Transfer - Section 1

A 10 cm dia steam pipe, carrying steam at 180°C, is covered with an insulation (conductivity = 0.6 W/m.°C). It losses heat to the surroundings at 30°C. Assume a heat transfer co-efficient of 0.8 W/m2.°C for heat transfer from surface to the surroundings. Neglect wall resistance of the pipe and film resistance of steam. If the insulation thickness is 2 cms, the rate of heat loss from this insulated pipe will be

A backward feed multiple effect evaporator is better than forward feed for concentrating cold feed, because it provides

Which of the following is concerned with both heat and mass transfer ?

Bulk of the convective heat transfer resistance from a hot tube surface to the fluid flowing in it, is

The average heat transfer co-efficient for laminar film condensation on vertical surface is inversely proportional to (where, ΔT = Temperature drop across condensate film )

Pick out the  wrong statement.

Thermal conductivity of a conducting solid material depends upon its

The heat flux (from outside to inside) across an insulating wall with thermal conductivity, K= 0.04 W/m.°K and thickness 0.16m is 10 W/m2. The temperature of the inside wall is - 5°C. The outside wall temperature is