vapour leaves the eva form the ice. The temp rom surroundings ma e, Determine the power 26 kJ/kg-K. Latent he

Elements Of Electromagnetics
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Author:Sadiku, Matthew N. O.
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Q.13 A vapour compression refrigeration system using refrigerant F-12 is employed to
produce 8640 kg of ice per day. The condensing and evaporating temperature of
refrigcrant are 48°C and-20°C respectively. Saturated liquid leaves the condenser
and saturated vapour leaves the evaporator. Compression is isentropic, water at
35°C is used to form the ice. The temperature of ice should be-8°C. Heat flow into
the brine tank from surroundings may be taken as 10% of total heat absorbed from
water to form ice. Determine the power required to drive the compressor. Take specific
heat of ice 2.26 kJ/kg-K. Latent heat of ice = 335 kJ/kg. Specific heat of water =
4.2 kJ/kg-K. The following data may be used:
%3D
Temp. Pressure
Enthalpy
Entropy
°C
bar
kJ/lg
kJ/kg-K
Liquid Vapour Liquid
Vapour
48°C
11.64
82.83
205.83
0.2973
0.6802
-20
1.51
17.82
178.74
0.0731
0.7087
Specific heat of vapour 0.82 kJ/kg
%3D
Transcribed Image Text:Q.13 A vapour compression refrigeration system using refrigerant F-12 is employed to produce 8640 kg of ice per day. The condensing and evaporating temperature of refrigcrant are 48°C and-20°C respectively. Saturated liquid leaves the condenser and saturated vapour leaves the evaporator. Compression is isentropic, water at 35°C is used to form the ice. The temperature of ice should be-8°C. Heat flow into the brine tank from surroundings may be taken as 10% of total heat absorbed from water to form ice. Determine the power required to drive the compressor. Take specific heat of ice 2.26 kJ/kg-K. Latent heat of ice = 335 kJ/kg. Specific heat of water = 4.2 kJ/kg-K. The following data may be used: %3D Temp. Pressure Enthalpy Entropy °C bar kJ/lg kJ/kg-K Liquid Vapour Liquid Vapour 48°C 11.64 82.83 205.83 0.2973 0.6802 -20 1.51 17.82 178.74 0.0731 0.7087 Specific heat of vapour 0.82 kJ/kg %3D
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