Emissivity of a body will be equal to its absorptivity at all temperatures.

More Questions from Heat Transfer, Refrigeration and Air Conditioning

• The by-pass factor, in case of sensible cooling of air, is given by (where td1 = Dry bulb temperature of air entering the cooling coil, td2 = Dry bulb temperature of air leaving the cooling coil, and td3 = Dry bulb temperature of the cooling coil)
• A mixture of dry air and water vapour, when the air has diffused the maximum amount of water vapour into it, is called
• The pressure at the outlet of a refrigerant compressor is called
• For unsaturated air, the dew point temperature is __________ wet bulb temperature.
• A thermostatic expansion valve in a refrigeration system
• The inclined and non-uniformly spaced straight lines on a psychrometric chart indicates wet bulb temperature.
• The C.O.P. of a heat pump working on a reversed Carnot cycle is
• The operating temperature of a cold storage is - 2° C. The heat leakage from the surrounding is 30 kW for the ambient temperature of 40° C. The actual C.O.P. of refrigeration plant used is one fourth that of ideal plant working between the same temperatures. The power required to drive the plant is
• The dry bulb temperature lines, on the psychrometric chart are
• The temperature rise, between the condenser outlet and expansion valve in ammonia vapour compression system, should be as low as possible.

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