![]() ![]() Isobutane is heated at 3400 kPa (a pressure just a little below its critical pressure) to a temperature of 140oC, at which conditions it enters the turbine. Pump efficiency = 85% Turbine efficiency = 80% Sketch the process in a T-S and a P-H diagramĤ Problem 8.11 A power plant operating on heat from a geothermal source uses isobutane as the working medium in a Rankine cycle. ![]() To show the effect of superheating on the performance of the cycle, calculate the thermal efficiency of the cycle and the quality of the exhaust steam from the turbine for turbine-inlet steam temperature of 450, 550, and 650 oC. The processes: > 1 2 Reversible adiabatic pumping > 2 3 Isobaric heating & evaporation > 3 4 Reversible adiabatic expansion red: irreversible > 4 1 Constant pressure,constant temperature ondensationģ Problem 8.4 Steam enters the turbine of a power plant operating on the Rankine cycle at 3300 kPa and exhausts at 50 kPa. ![]() 3 sks 6 – Production of Power from Heat & Refrigeration Dicky Dermawan ![]()
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