An ideal gas refrigeration system with three stages of compression with intercooling operates with air entering the first compressor at 50 kPa and - 30oC. Each compressor in this system has a pressure ratio of 7, and the air temperature at the outlet of all intercoolers is 15oC. Calculate the COP of this system. Use constant specific heats at room temperature.

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H,I 와12 QH3 Compressor Compressor Compressor Turbine QL