15. A reheat-regenerative engine receives steam at 207 bar and 593C, expanding it to 38.6 bar, 343C. At this point, the steam passes through a reheater and reenters the turbine at 34.5 bar, 593C, hence expands to 9 bar, 492C, 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 171C 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