This Table shows the output power and efficiency for the selected four working fluids calculated at geothermal temperature of 92˚C, reinjection temperature of 70˚C and geothermal flow rate of 20 kg/s. It was found from the Table that, Pentane meets our customers’ demand, giving the highest output power of approximately 213 kW and the highest thermal efficiency of 11.5%. On the other hand, R245fa yielded the lowest power output and the lowest efficiency.