Asimple rankine cycle operates with water as the working fluid between the pressures of 4 mpa and 20 kpa. the fluid leaves the boiler at 550°c, the turbine efficiency is 89% and the fluid exits the condenser as saturated liquid. the flow rate is 81.5 kg/s and the pump efficiency is 52%. determine: a)- the net power output, in kw. b)- the rate of heat input in the boiler, in kw. c)- the rate of heat rejection in the condenser, in kw. d)- the overall efficiency of the bankine cycle engine.

Amass of m 1.5 kg of steam is contained in a closed rigid container. initially the pressure and temperature of the steam are: p 1.5 mpa and t 240°c (superheated state), respectively. then the temperature drops to t2= 100°c as the result of heat transfer to the surroundings. determine: a) quality of the steam at the end of the process, b) heat transfer with the surroundings. for: p1.5 mpa and t 240°c: enthalpy of superheated vapour is 2900 kj/kg, specific volume of superheated vapour is 0. 1483 m/kg, while for t 100°c: enthalpy of saturated liquid water is 419kj/kg, specific volume of saturated liquid water is 0.001043m/kg, enthalpy of saturated vapour is 2676 kj/kg, specific volume of saturated vapour is 1.672 m/kg and pressure is 0.1 mpa.