15 Short Answer Question about Heat Transfer

Please see the attached file for the fully formatted problem(s). Short Type Questions with Answers and Reasons of Heat Transfer 1. What is the reason for the low conductivity of heat insulating materials? 2. When the LMTD (Log Mean Temperature Difference) correction factor used in Heat Exchanger Calculations? 3. Arrange the following in increasing order of Prandtl number. Glycerol, Mercury, Water and Oxygen. 4. What are the factors on which the the thickness of condensate layer in film wise condensation depend? 5. On what factors does the Shell Side pressure drop in shell and tube heat exchanger depend? 6. Why water is used extensively used as a coolant in Heat Exchange Equipme... click for more

Mass Transfer: 21 Short Answer Questions

Please see the attached file for the fully formatted problem(s). 1. What happens to the rate of leaching with increase in temperature? 2. State some common problems of packed columns. 3. What types of towers are suitable for corrosive and foamy liquids? 4. Why plate towers are preferred to packed columns when large temperature changes are involved? 5. for vacuum operation why packed towers are desirable? 6. Give some essential characteristics of a good absorbent. 7. What are the main criteria for a binary fractionation? 8. When is steam distillation recommended? 9. When a natural draft cooling tower is generally used? 10. What are spray chambers? 11. What do you mean by consta... click for more

Heat Loss through the Roof of a House

Please see the attached file for the fully formatted problem(s). The roof of a house with a gas furnace consists of 3 cm thick concrete that is losing heat to the outdoors by radiation and convection. Determine the rate of heat transfer through the roof and money lost through the roof that night during a 14 hour period.

Thickness of Insulation for Avoiding Condensation on Refrigerator Wall

Please see the attached file for the fully formatted problem(s). The wall of a refrigerator is costructed of fiberglass insulation sandwiched between two layers of sheet metal.The minimum thickness of insulation that needs to be used in the wall in order to avoid condensation on the outer surface to be determined. given that Thermal conductivity for sheet metal = 15.5 W/m deg C Thermal conductivity for fiberglass insulation = 0.035 W/m deg C

Steady Heat Conduction: Thermal Resistance

Thickness of copper plate whose thermal resistance is equal to thermal contact resistance is to be determined, given that: Thermal conductivity of copper = 386 W/m deg C