The capacity of a refrigeration plant is 60 kW and its design parameters are: -Evaporation temperature: Tev = -40 °C, with DT_evaporator = 8 °C. -Condensing temperature Tcd = 35 °C. -The condenser is cooled by water, which enters at 27°C and leaves at 30°C. The subcooling ∆T it is 5°C. The refrigerant used is R717. - The ∆T of superheating is 5 °C at the outlet of the evaporator and 15 °C in the pipe of aspiration. The pressure loss in the suction pipe is 1°C while the loss of pressure in the pipe on the evaporation coil is 6°C. It is requested: a) Show the scheme of principle suitable for the indicated conditions and draw t he cycle diagram. B) Calculate the theoretical power of the compressor in kW C) Determine the COP and the efficiency of the system.
The capacity of a refrigeration plant is 60 kW and its design parameters are:
-Evaporation temperature: Tev = -40 °C, with DT_evaporator = 8 °C. -Condensing temperature Tcd = 35 °C.
-The condenser is cooled by water, which enters at 27°C and leaves at 30°C. The subcooling ∆T it is 5°C. The refrigerant used is R717.
- The ∆T of superheating is 5 °C at the outlet of the evaporator and 15 °C in the pipe of aspiration. The pressure loss in the suction pipe is 1°C while the loss of pressure in the pipe on the evaporation coil is 6°C. It is requested:
a) Show the scheme of principle suitable for the indicated conditions and draw t he cycle diagram.
B) Calculate the theoretical power of the compressor in kW
C) Determine the COP and the efficiency of the system.
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