C. A firm, chooses an ideal gas, air refrigeration system to provide the cooling in their refrigerators. For the operating environment the air enters the system compressor at 37.5 kPa and -23.2C (State Point 1). The system will have a pressure ratio of 4.35 for both compressor and turbine with an isentropic efficiency for both of 89.5%. The temperature at the turbine inlet is 96.9C (State Point 3). For a fully occupied plane the system must be sized to provide 16.4 kW of cooling. Warm environment Heat exchanger USE A METHOD CONSISTENT WITH VARIABLE SPECIFIC HEATS!!! (aka: do not use constant specific heats) Turbine 4. (15 pts) In C, what is the COP for this refrigerator? 5. (10 pts) In C, what is the mass flow rate of air? dm/dt = kg/s www Compressor W net,in Heat exchanger Q Cold refrigerated space