A binary geothermal power plant uses geothermal water at 160°C as the heat source. The plant...

A binary geothermal power plant uses geothermal water at 160°C as the heat source. The plant operates on the simple Rankine cycle with isobutane as the working fluid. Heat is transferred to the cycle by a heat exchanger in which geothermal liquid water enters at 160°C at a rate of 555.9 kg/s and leaves at 90°C. Isobutane enters the turbine at 3.25 MPa and 147°C and leaves at 79.5°C and 410 kPa. Isobutane is condensed in an air-cooled condenser and pumped to the heat exchanger pressure. Assume that the pump to has an isentropic efficiency of 90 percent. Take the specific heat of geothermal water is taken to be 4.258 kJ/kg·C. The properties of isobutane are given as h1 = 273.01 kJ/kg, v1 = 0.001842 m3/kg, h3 = 761.54 kJ/kg, h4 = 689.74 kJ/kg, and h4s = 670.40 kJ/kg. (a) the isentropic efficiency of the turbine, (b) the net power output of the plant, and (c) the thermal efficiency of the cycle.

Expert Solution

genius_generous answered 2 years ago

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