The thermal diffusivity for solids is generally less than those for liquids and gases.

More Questions from Heat Transfer, Refrigeration and Air Conditioning

• The by-pass factor (B. P. F.) in case of sensible heating of air is (Where td1 = Dry bulb temperature of air entering the heating coil, td2 = Dry bulb temperature of air leaving the heating coil, and td3 = Dry bulb temperature of heating coil)
• A condenser of refrigeration system rejects heat at the rate of 120 kW, while its compressor consumes a power of 30 kW. The coefficient of performance of the system will be
• The capacity of a domestic refrigerator is in the range of
• Carbon dioxide is
• The difference between dry bulb temperature and dew point temperature, is called
• Conduction is the process of heat transfer from one particle of the body to another by the actual motion of the heated particles.
• If the condenser temperature is kept constant, the coefficient of performance of a refrigeration cycle increases with the increase in evaporator temperature.
• When α is absorptivity, ρ is reflectivity and τ is transmittivity, then for a diathermanous body,
• The central air conditioning system has __________ overall efficiency as compared to individual systems.
• Logarithmic mean temperature difference is the same as the arithmetic mean temperature difference.

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