Geothermal liquid water at 200C is extracted from a geothermal well at a rate of 100 kg/s.
Question:
Geothermal liquid water at 200°C is extracted from a geothermal well at a rate of 100 kg/s. This water is flashed to a pressure of 500 kPa in the flash chamber of a single-flash geothermal power plant. The condenser is maintained at a pressure of 10 kPa. The quality of the steam at the turbine exit is 83 percent.
(a) What is the mass flow rate of water vapor at the turbine inlet?
(b) Determine the power output from the turbine and the thermal efficiency of the plant.
(c) Assume this single-flash plant is retrofitted to operate as a double-flash plant. The first and second flash pressures are selected as 500 kPa and 150 kPa, respectively. What are the power output and thermal efficiency of this double-flash plant? Other parameters remain the same.
Thermodynamics An Engineering Approach
ISBN: 978-0073398174
8th edition
Authors: Yunus A. Cengel, Michael A. Boles