A proposed Ocean Thermal Energy Conversion (OTEC) plant drawsheat from the ocean surface at 22°C and rejects heat to the waternear the ocean bed at 4°C. What is the highest thermal efficiencythe plant could achieve? [4] (b) Consider a system undergoing anadiabatic process from a fixed state 1 to a fixed state 2. Use theSecond Law of Thermodynamics to prove that the maximum work is doneby the system if the process is reversible. [6] (c) Steam at 20 MPaand 460°C flows at 12 kg/s into an adiabatic turbine and exits at20 kPa. What is the maximum possible power output of the turbine?What is the temperature of the steam at the exit in that case? [5](d) Steam at 20 MPa and 460°C flows at 12 kg/s into an adiabaticturbine and exits at 20 kPa and 85% quality. What is the isentropicefficiency of the turbine?
