![]() ![]() ![]() 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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