For a white body, absorptivity (α ) = 0, reflectivity (ρ) = 1 and transmittivity (τ) = 0.

More Questions from Heat Transfer, Refrigeration and Air Conditioning

• The use of heat exchangers is made in
• The ratio of the thickness of thermal boundary layer to the thickness of hydrodynamic boundary layer is equal to (Prandtl number)n, where n is equal to
• The sensible heat factor during the heating and humidification process is given by (where h1 = Enthalpy of air entering the heating coil, h2 = Enthalpy of air leaving the heating coil, and hA = Enthalpy of air at the end of humidification process)
• The horizontal and uniformly spaced lines on a psychrometric chart indicates relative humidity.
• Bell-Coleman cycle is a
• Which of the following statement is correct?
• The sulphur sticks, in case of leakage of ammonia refrigerant, gives white smoke.
• The transfer of heat from one body to another takes place only when there is a temperature difference between the bodies.
• During gas charging in an ammonia vapour compression system, the connection is made at the compressor outlet.
• The water, alcohol and ammonia have same refrigerating effect at different altitudes.

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