4. Steam enters the turbine at 10 MPa and 500 °C with mass flow rate of 10 kg is condensed in the condenser at a pressure of 10 KPa. Some Steam is extracted f the turbine at 0.8 MPa and enters in an open feedwater heater. Determine the an of steam that is condensed in the condenser. a. 20.7 kg/s b. 1000 kg/s 475 5 ka/min

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SITUATIONAL PROBLEM NO IV A reheat cycle with two stages of reheating is executed with steam expanding initially from 20MPA and 540degC. The two reheater pressures are 3.8MPA and 0.97MPa, and the steam leavers each reheater at 540degC. Condensation occurs at 60degC. For an Ideal cycle of 1kg/s of steam find: 14. Heat Added 15. Turbine Work 16. Heat Rejected 17. Pump Work 18. Net Work 19. Thermal Efficiency of the system

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Power plant.

A standard vapour compression cycle using freon 22 operates on simple saturation cycle at the following conditions: Refregirating capacity 15TR condensing temperature 42 C and evaporating temperature -2 C. Calculate (10) a) Volume flow rate of refrigerant at compressor suction. b) Compressor discharge temperature.

Pevap=4 bar, Pcond=20 bar, Qevap=6 kW, p6= 8.9 bar Refrigerant ( ammonia (R717) ) leaves the condenser as saturated liquid and as saturated vapor from the evaporator. Compression process in the compressor is isentropic. A) Based on the simple vapor-compression refrigeration cycle below, determine the compressor power and COP. Condenser 3 Evaporator ### Plot the T-s and P-h diagrams for options A Licensed for single user. © 2009 ASHRAE, Inc. -200 40 200 400 600 800 1000 1200 1400 1600 R-717 1800 2000 2200 2400 40 (ammonia) 20 Reference state: h- 200.0 kg. 1.00 kJjko KI for saturated kquid at OC 350 300 150 P: 100 kgm 80 200 10 20 60 8 120 6 40 10 100 30 4 8 80 20 6. 15 2 4 10 8.0 1 6.0 0.8 0.6 T= 20°C 4.0 1 0.8 3.0 0.4 20 0.6 1.5 0.2 0.4 1.0 0.80 0.1 0.2 0.60 0.08 0.06 0.40 0.1 0.30 0.04 0.08 0.20 0.06 0.15 0.02 8.00 0.04 0.10 840 KJkg K) 0.080 0.02 0.01 -200 8.80 0.060 200 400 600 800 Properties computed with: NIST REFPROP 1000 1200 1400 1600 0.01 2400 1800 2000 version 7.0 2200…

In an ideal reheat-regenerative cycle, steam enters the turbine at 8.1356Mpa and 400.356oC. After expansion to 280.356oC the steam is withdrawn and reheated to 340oC. Extractions for feedwater heating occur at 1.6356Mpa and 0.70356Mpa and condenser pressure is 0.005356 Mpa.a) For ideal cycle, find ec. b) Draw the schematic diagram and T-s diagram with label

A reheat-regenerative rankine cycle needs to produce 150MW of net power. Boiler pressure is at 15MPa. Reheat occurs at 10MPa. extractions occur at 5MPa and 2MPa for open feedwater heaters. These extractions occur after the expansion after reheating. Steam leaves the boiler and reheater at 600C. Condenser pressure is at 10kPa. SOLVE FOR: a.) Determine the amount of steam needed passing through the boiler to produce the required net power (kg/s) b.) Determine the amount of heat added to the system (kJ/s) c.) Determine the thermal efficiency of this cycle (%) PLS PLS USE THE ATTACHED IMAGE OF THE STEAM TABLE FOR THE VALUES FOR ENTHALPHYS ANSWERS ROUND OFF TO SIG SIGNIFICANT FIGURES