QUESTION 2
A compressor requires 35 kW to drive a refrigeration plant. The evaporator
and condenser temperatures are -10,4Β°C and 30,5Β°C respectively. The plant
converts water at 13,75Β°C to dry ice at -4Β°C.
Take the specific heat capacity of the dry ice at -4 Β°C is 1,7 kJ/kg.K. and the
latent heat of the ice as 329,8 kJ/kg.
Calculate each of the following:
2.1
Amount of cooling effect required in kJ to produce 2000 kg of dry ice
(6)
2.2
The compressor work done required in kJ to produce 1 600 kg of ice if the
actual coefficient of performance is 40 per cent of the ideal coefficient of
performance
(9)
2.3
Mass of ice in kg produced by the plant in 24 hours
(5)
[20]
