Water vapor enters a valve with a mass flow rate of 1 kg/s at a temperature of 260 degrees C and a pressure of 3.5 MPa, and undergoes a throttling process to 2.75 MPa (T0=25, P0=100kPa).
1) Determine the total flow EXERGY rates at the valve inlet and exit, and the rate of EXERGY destruction (all in kW).
2) Evaluating EXERGY at $0.08/kWhr, determine the annual cost associated with the EXERGY destruction, assuming 8000 hours of annual operation.