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. USE A METHOD CONSISTENT WITH VARIABLE SPECIFIC HEATS!!! (aka: do not use constant specific heats) 4. (15 pts) In C, what is the COP for this refrigerator? Turbine Warm environment Heat exchanger (2) Compressor W net,in 1-0 5. (10 pts) In C, what is the mass flow rate of air? dm/dt = kg/s www Heat exchanger QL Cold refrigerated space