3. Saturated water vapor at 300°F enters a compressor operating at steady state with a mass...
Problem 4.041 SI Refrigerant 134a enters an insulated compressor operating at steady state as saturated vapor at -26°C with a volumetric flow rate of 0.18 m3/s. Refrigerant exits at 9 bar, 70°C. Changes in kinetic and potential energy from inlet to exit can be ignored. Determine the volumetric flow rate at the exit, in m3/s, and the compressor power, in kW.
Problem 4. Water vapor at 6 MPa, 600 °C enters a turbine operating at steady state and expands to 10 kPa. The mass flow rate is 2 kg/s, and the power developed is 2626 kW. Stray heat transfer and kinetic and potential energy effects are negligible. Determine (a) the isentropic turbine efficiency and (b) the rate of entropy production within the turbine in kw/K.
Water vapor at 5 MPa, 320 C enters a turbine operating at steady state and expands to 0.1 bar. The mass flow rate is 6.52 kg/s, and the isentropic turbine efficiency is 92%. Stray heat and kinetic and potential energy effects are negligible. Determine the power developed by the turbine in kW. ht 6/3 of En Help I S Water vapor at 5 MPa, 320°C enters a turbine operating at steady state and expands to 0.1 bar. The mass flow...
A mixture having a molar analysis of 60% N2 and 40% CO2 enters an insulated compressor operating at steady state at 1 bar, 30°C with a mass flow rate of 1 kg/s and is compressed to 3 bar, 157°C. Neglecting kinetic and potential energy effects, determine: (a) the magnitude of the power required, in kW. (b) the isentropic compressor efficiency, in percent. (c) the rate of exergy destruction, in kW, for T0 = 300 K.
6. Refrigerant-134a enters an adiabatic compressor as saturated vapor at 100 kPa at a rate of 0.7 m3/min and exits at 1 MPa pressure. If the isentropic efficiency of the compressor is 87%, determine (a) the temperature of the refrigerant at the exit of the compressor, (b) the power input (in kW), and (c) the rate of entropy generation during this process.
1 MPa Isentropic Efficiency of a Compressor Refrigerant-134a enters an adiabatic compressor as a saturated vapor at 100kPa at a rate of 0.7 m/min and exits at 1-MPa pressure. The isentropic efficiency of the compressor is 87%. R-134a Compressor Isentropic Compressor Work hs-h 100 kPa sat. vapor Actual Compressor Work Determine the refrigerant properties at the inlet and outlet for an isentropic process. Actual 2s entropic procEss Inlet state Determine the actual isentropic enthalpy from the efficiency. (Ans: 289.71 J/kg)...
Problem 3 (70 points) Water vapor at 10 MPa, 600°C enters a turbine operating at steady state with a mass flow rate of 9.5 kg/s and exits at 0.1 bar and a quality of 92%. Stray heat transfer and kinetic and potential energy effects are negligible. (a) (30 points) Determine the rate of entropy production, Ocv, in kW/K. (b) (40 points) Determine the isentropic turbine efficiency, .
1. Saturated R134a vapor enters the uninsulated compressor of a home central air- conditioning system at 4 °C. The flow rate of R134a through the compressor is 0.1 kg/s, and the electrical power input is 5 kW. The exit state is 65 °C with 1000 kPa. Any heat transfer from the compressor is to the ambient environment at 27 °C. a) Determine the rate of entropy production for the process in kW/K. b) If the change in enthalpy for the...
Water vapor at 6 MPa and 500 °C enters a turbine operating at steady state and expands to 1 bar. Mass flow rate is 2kg/s. Neglect heat transfer, kinetic energy and potential energy changes. For the actual process (1-2), water leaves the turbine with a specific entropy S2 = 7.1176 kJ / kg / k Find: a) Plot isentropic process in the turbine (1-2s) and the actual process in the turbine (1-2) on a T-s diagram. Justify the location of...
. Steam enters a turbine at 140 psi and 1000°F at steady state and expands adiabatically to 5 psi, 275°F. The mass flow rate of the steam is 4 lb/s. Determine for the turbine a. (3) Draw your complete understanding of this problem on a T-s diagram b. (8) The power developed, in hp c. (7) The rate of entropy production, in hp/°R d. (7) The isentropic turbine efficiency, %