The critical thickness of insulation is the ratio of thermal conductivity of the insulating material (k) to the heat transfer coefficient at the outer surface of the insulation (h0).
Options
A. True
B. False
Correct Answer
True
Heat Transfer, Refrigeration and Air Conditioning problems
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1. Upto the critical radius of insulation,
Options
A. added insulation will increase heat loss
B. added insulation will decrease heat loss
C. convective heat loss will be less than conductive heat loss
3. The heat transfer by conduction through a thick cylinder(Q) is given by (where T1 = Higher temperature, T2 = Lower temperature, r1 = Inside radius, r2 = Outside radius, l = Length of cylinder, and k = Thermal conductivity)
4. If the evaporator temperature is kept constant, the coefficient of performance of a refrigeration cycle __________ with the increase in condenser temperature.
7. In counter-current flow heat exchanger, the logarithmic temperature difference between the fluids is __________ as compared to parallel flow heat exchanger.