No.4
Refrigeration Problem. Calculate the power required in Ref-22 system which serves a 21 kW evaporator at -20°C. The system uses two-stage compression with intercooling and removal of flash gas. The condensing temperature is 36°C.
System Diagram:
5
Condenser 36°C
3
Intercooler and flash tank
2
High-stage compressor
Low-stage compressor
Evaporator 210 kW, -20°C
Cycle p-h diagram:
Pressure, kPa 360 -20°C Enthalpy, kJ/kg