A geothermal power plant uses geothermal liquid water (assume saturated liquid) at 150 °C at a rate of 210 kg/s as the heat source, and produces 5.1 MW of net power in an environment at 25 °C. If 7.5 MW of exergy entering the plant with the geothermal water is destructed within the plant, determine:
(a) the exergy of the geothermal water entering the plant, and
(b) the second-law efficiency