A binary geothermal power plant produces 5 MW power using a geothermal resource at 175oC at a

Question:

A binary geothermal power plant produces 5 MW power using a geothermal resource at 175oC at a rate of 110 kg/s. If the temperature of geothermal water is decreased to 90oC in the heat exchanger after giving its heat to binary fluid, the thermal efficiency of the binary cycle is
(a) 7.5%
(b) 16.3%
(c) 14.4%
(d) 12.5%
(e) 9.7%