Q1: In a hypothetical cyclic steam power plant Incorporating a single direct-contact feed wa steam leaves...

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Q1: In a hypothetical cyclic steam power plant Incorporating a single direct-contact feed wa steam leaves the boiler at 6 MPa and 500 C and the condenser pressure is 10 kPa. Expansion is reversible and adiabatic. The feed water heater takes steam bled from the turbine at press and heats the feed water to the corresponding saturation temperature. Temperature and en of the fluid in passing through any pumps may be neglected. Calculate: a. the mass of steam bled from the turbine per kg of steam leaving the boiler. b. The cycle efficiency. C. The improvement in thermal efficiency due to the introduction of this single stage of fee heating, expressed as a percentage of the Rankine cycle efficiency. superheat P MPa 6 TC 500 h S 3423.1 6.8826 saturated P kPa Tsat C 100 99.61 10 45.81 hf 417.51 191.81 hfg 2257.5 hg sf 2675 1.3028 6 2392.1 2583.9 0.6492 Q1: In a hypothetical cyclic steam power plant Incorporating a single direct-contact feed wa steam leaves the boiler at 6 MPa and 500 C and the condenser pressure is 10 kPa. Expansion is reversible and adiabatic. The feed water heater takes steam bled from the turbine at press and heats the feed water to the corresponding saturation temperature. Temperature and en of the fluid in passing through any pumps may be neglected. Calculate: a. the mass of steam bled from the turbine per kg of steam leaving the boiler. b. The cycle efficiency. C. The improvement in thermal efficiency due to the introduction of this single stage of fee heating, expressed as a percentage of the Rankine cycle efficiency. superheat P MPa 6 TC 500 h S 3423.1 6.8826 saturated P kPa Tsat C 100 99.61 10 45.81 hf 417.51 191.81 hfg 2257.5 hg sf 2675 1.3028 6 2392.1 2583.9 0.6492