Refrigerant 134a enters a compressor with a mass flow rate of 15 kg/s with a velocity of 10 m/s. The refrigerant enters the compressor as a saturated vapor at 10°C and leaves the compressor at 1400 kPa with an enthalpy of 281.39 kJ/kg with a negligible velocity. The rate of work done on the refrigerant is measured to be 380 kW. If the elevation change between the compressor inlet and exit is negligible, determine the rate of heat transfer associated with this process, in kW.

Determine the work required (in kJ/kg) for a pump that is used to increase the pressure of a liquid water stream from 100 kPa to 1500 kPa isothermally at 20 °C. The specific heat of water (C) is 0.0035 kJ/kg.K. its specific volume is 0.001031 m³/kg and its volume expansivity (B) is 250x10 K

Thermodynamics