15. A reheat-regenerative engine receives steam at 207 bar and 593C, expanding it to 38.6 bar,...

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15. A reheat-regenerative engine receives steam at 207 bar and 593°C, expanding it to 38.6 bar, 343°C. At this point, the steam passes through a reheater and reenters the turbine at 34.5 bar, 593°C, hence expands to 9 bar, 492°C, at which point the steam is bled for feedwater heating. Exhaust occurs at 0.07 bar. Beginning at the throttle (point 1), these enthal- pies are known (kJ/kg): h, = 3511.3 h, = 3082.1 h, = 3010.0 h. = 3205.4 h, = 3662.5 h, = 163.4 h. = 322.9 h, = 723.59 h, = 2308.1 h, = 742.83 For ideal engine, sketch the events on the Ts plane and for 1 kg of throttle steam, find (a) the mass of bled steam, (b) the work, (c) the efficiency, and (d) the steam rate. In the actual case, water enters the boiler at 171°C and the brake engine efficiency is 75% (e) determine the brake work and the brake thermal efficiency. (f) Let the pump efficiency be 65%, esti- mate the enthalpy of the exhaust steam. Ans. (a) 0.19 kg/kg, (b) 1685.1 kj/kg, (c) 49.26%, (d) 2.14 kg/ kwh, (e) 1263.8 kJ/kg, 37.5%%; (f) 2742 kJ/kg 15. A reheat-regenerative engine receives steam at 207 bar and 593°C, expanding it to 38.6 bar, 343°C. At this point, the steam passes through a reheater and reenters the turbine at 34.5 bar, 593°C, hence expands to 9 bar, 492°C, at which point the steam is bled for feedwater heating. Exhaust occurs at 0.07 bar. Beginning at the throttle (point 1), these enthal- pies are known (kJ/kg): h, = 3511.3 h, = 3082.1 h, = 3010.0 h. = 3205.4 h, = 3662.5 h, = 163.4 h. = 322.9 h, = 723.59 h, = 2308.1 h, = 742.83 For ideal engine, sketch the events on the Ts plane and for 1 kg of throttle steam, find (a) the mass of bled steam, (b) the work, (c) the efficiency, and (d) the steam rate. In the actual case, water enters the boiler at 171°C and the brake engine efficiency is 75% (e) determine the brake work and the brake thermal efficiency. (f) Let the pump efficiency be 65%, esti- mate the enthalpy of the exhaust steam. Ans. (a) 0.19 kg/kg, (b) 1685.1 kj/kg, (c) 49.26%, (d) 2.14 kg/ kwh, (e) 1263.8 kJ/kg, 37.5%%; (f) 2742 kJ/kg

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