Steam Power Plant, Calcs

simonre7

Hi guys, very similar to my other thread apart from this is work from Thermofluids 2!

Steam ar 40 bar and 400C enters the high pressure turbine of a steam power plant at a rate of 20kg/s and explands to a pressure of 3 bar at which point it is just dry saturated. at this point part of the steam is re heated to 400C and then expands in the low pressure turbine to a condenser pressure of 0.05 bar with an isentropic efficiency of 88%. the remainder passes directly to asingle 'open' feed heater. the water leaving the condenser is raised to the feed heater pressure which it enters at a temp of 50C

1) Draw a schematic diagram of the plant and a corredponding cycle diagram on a temperature-entropy axes

2) neglecting feed pump work inputs, find:
a) the mass flow rates of steam and water entering the feed heater
b) the plnats power output and heat input
c) the plants thermal efficiency

any help would be greatly appriciated even jsut a shove in the right direction

cheers guys!