A vapour compression refrigeration plant, which uses refrigerant-134a operates at an evaporator pressure of 240 kPa and a condenser pressure of 1.2 MPa. The refrigerant leaves the evaporator at 0 oC and exits the condenser at 40oC. The two-stage compression is isentropic. The refrigerant that leaves the condenser is throttled to a flash chamber with a saturation temperature of 15.71oC. Saturated vapour is extracted from the flash chamber and mixes with the refrigerant that leaves the low-pressure compressor, before entering the high-pressure compressor. Saturated liquid from the flash chamber is throttled to the evaporator. If the refrigeration load is 500 kW, determine the: a) mass flow rate of refrigerant through the condenser (kg/s), b) mass flow rate of refrigerant extracted from the flash chamber (kg/s) c) Power required by the low pressure compressor (kW).
A vapour compression refrigeration plant, which uses refrigerant-134a
operates at an evaporator pressure of 240 kPa and a condenser pressure
of 1.2 MPa. The refrigerant leaves the evaporator at 0
oC and exits the
condenser at 40oC. The two-stage compression is isentropic. The
refrigerant that leaves the condenser is throttled to a flash chamber with a
saturation temperature of 15.71oC. Saturated vapour is extracted from the
flash chamber and mixes with the refrigerant that leaves the low-pressure
compressor, before entering the high-pressure compressor. Saturated
liquid from the flash chamber is throttled to the evaporator. If the
refrigeration load is 500 kW, determine the:
a) mass flow rate of refrigerant through the condenser (kg/s),
b) mass flow rate of refrigerant extracted from the flash chamber (kg/s)
c) Power required by the low pressure compressor (kW).
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