Refrigeration and Air Conditioning A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of -23°C. The Carnot coefficient of performance of cycle will be 5 6 1.2 0.2 5 6 1.2 0.2 ANSWER DOWNLOAD EXAMIANS APP
Refrigeration and Air Conditioning 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 7.44 kW 18.6 kW 3.72 kW 1.86 kW 7.44 kW 18.6 kW 3.72 kW 1.86 kW ANSWER DOWNLOAD EXAMIANS APP
Refrigeration and Air Conditioning A good refrigerant should have High latent heat of vaporisation and low freezing point High specific volume and high latent heat of vaporisation High operating pressures and low freezing point Low C.O.P. and low freezing point High latent heat of vaporisation and low freezing point High specific volume and high latent heat of vaporisation High operating pressures and low freezing point Low C.O.P. and low freezing point ANSWER DOWNLOAD EXAMIANS APP
Refrigeration and Air Conditioning The coefficient of performance (C.O.P.) of a refrigerator working as a heat pump is given by ( ( O.P)P = ( O.P.)R + 1 O.P.)P = ( ( ( O.P.)P = ( O.P.)R + 2 O.P)R O.P)R - 1 O.P)P = ( ( ( O.P)P = ( O.P.)R + 1 O.P.)P = ( ( ( O.P.)P = ( O.P.)R + 2 O.P)R O.P)R - 1 O.P)P = ( ANSWER DOWNLOAD EXAMIANS APP
Refrigeration and Air Conditioning Under cooling in a refrigeration cycle Decreases C.O.P Increases C.O.P Other factors decide C.O.P O.P remains unaltered Decreases C.O.P Increases C.O.P Other factors decide C.O.P O.P remains unaltered ANSWER DOWNLOAD EXAMIANS APP
Refrigeration and Air Conditioning Formation of frost on evaporator in refrigerator Increases heat transfer rate Results in loss of heat due to poor heat transfer Can be avoided by proper design Is immaterial Increases heat transfer rate Results in loss of heat due to poor heat transfer Can be avoided by proper design Is immaterial ANSWER DOWNLOAD EXAMIANS APP
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