Consider a small simple Rankine Power cycle which produces 600kW power from an electric generator with an efficiency of 95%. The steam leaves the boiler at 1250psia as superheated steam and leaves the turbine at 2 psia with a quality of 90%.
a. What is the mass flow rate of steam through the turbine, lb/h?
b. If the boiler has an efficiency of 85% and burns natural gas with a heating value of 100,000 btu/therm at a cost of $1.25/therm, what does it cost to provide natural gas to this plant in $/hr?
c. What is the heat rejection for the condenser in btu/h?
d. If the condenser is water cooled with cooling water entering at 85deg F and leaving at 100 deg F, what flow rate of cooling water is required in gpm?
e. What size schedule 40 steel pipe would you recommend for this flow? And what would the actual loss factor be for this selection if ft/100ft?
(Hint: you use 2.5 ft/100 ft, in the range of 1 to 4 ft/100 ft for selection but once you make a selection, there is an actual head loss factor then for that selection).