Chapter 8, Problem 8.30CU

PLEASE SHOW COMPLETE SOLUTION (DRAW THE TS DIAGRAM)

Please match the formulate (energy and/or mass balance) to the corresponding steady flow devices:                                                                        A not well insulated nozzles by neglecting the potential energy change.                                                                        An adiabatic turbine by neglecting the kinetic and potential energy change.                                                                        A not well insulated compressor by neglecting the kinetic and potential energy change.                                                                        An adiabatic mixing chamber with two inlets and one exit by neglecting the kinetic and potential energy change.                                                                        An adiabatic throttling valve by neglecting the kinetic and potential energy change. A.   B.   C.   D.   E.

In an ideal gas refrigeration cycle, helium enters the compressor at a temperature of 15 ̊C and a pressure of 100 kPa and leaves at a pressure of 300 kPa. The temperature of helium at the turbine inlet is 30 ̊C. Assuming that the isentropic efficiency of the compressor and turbine is 80%; Calculate a) the lowest and highest temperatures of the cycle, b) the efficiency coefficient of the cycle, c) the required helium flow rate for 5 kW cooling capacity