The heat rejection factor (HRF) is given by

More Questions from Heat Transfer, Refrigeration and Air Conditioning

• An electric cable of aluminium conductor (k = 240 W/mK) is to be insulated with rubber (k = 0.15 W/mK). The cable is to be located in air (h = 6 W/m2). The critical thickness of insulation will be
• The amount of heat flow through a body by conduction is
• In order to collect liquid refrigerant and to prevent it from going to a __________ , a device known as accumulator is used at the suction of compressor.
• The dry bulb temperature during sensible heating of air
• A reversible engine has ideal thermal efficiency of 30%. When it is used as a refrigerating machine with all other conditions unchanged, the coefficient of performance will be
• In a vapour compression system, the condition of refrigerant is dry saturated vapour
• The vertical and uniformly spaced lines on a psychrometric chart indicates
• A furnace is made of a red brick wall of thickness 0.5 m and conductivity 0.7 W/mK. For the same heat loss and temperature drop, this can be replaced by a layer of diatomite earth of conductivity 0.14 W/mK and thickness
• The coefficient of performance of a domestic refrigerator is __________ as compared to a domestic air-conditioner.
• The rate of heat flow through a body is . The term is known as temperature gradient.

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