I am trying to come up with a design for a steam power cycle with a 40% thermal efficiency under the conditions that all turbines have isentropic efficiencies of 85% and all pumps have isentropic efficiencies of 60%. I have tried superheat, reheat, playing around with pressures/temperatures and having no luck. I also need to give a rough estimate on how much it would cost to build such a machine and I can't find anywhere that gives the cost of a steam turbine... Is there anyone who might be able to give me some advice on this subject? Perhaps something that I haven't thought of yet? I'm just looking for some ideas... Thank you for your help!