To reduce the volume flow rate and hence turbine physical size, powerplants that operate with low initial temperature water as a heat source, such as some types of geothermal (Chap. 12) and ocean temperature energy conversion, OTEC (Chap. 15), powerplants, use working fluids other than steam, such as Freon- 12, ammonia, and propane. Compare the mass flow rates, pound mass per hour, volume flow rates, cubic feet per second, and boiler and condenser pressures of (a) Freon-12, (b) propane, and (c) steam, if all cycles operate with adiabatic reversible turbines that receive saturated vapor at 200F and condense at 70F, and each produces 100 kW.