Superheated steam at 18 MPa, 560C, enters the turbine of a vapor power plant. The pressure at the exit of the turbine is 0.06 bar, and liquid leaves the condenser at 0.045 bar, 26C. The pressure is increased to 18.2 MPa across the pump. The turbine and pump have isentropic efficiencies of 82 and 77%, respectively. For the cycle, determine (a) the net work per unit mass of steam flow, in kJ/kg. (b) the heat transfer to steam passing through the boiler, in kJ per kg of steam flowing. (c) the thermal efficiency. (d) the heat transfer to cooling water passing through the condenser, in kJ per kg of steam condensed. In t he preliminary design of a power plant, water is chosen as the working fluid and it is determined that the turbine inlet temperature may not exceed 520C. Based on expected cooling water temperatures, the condenser is to operate at a pressure of 0.06 bar. Determine the steam generator pressure required if the isentropic turbine efficiency is 80% and the quality of steam at the turbine exit must be at least 90%.
-Superheated steam at 18 MPa, 560C, enters the turbine of a vapor power plant. The pressure at the
exit of the turbine is 0.06 bar, and liquid leaves the condenser at 0.045 bar, 26C. The pressure is
increased to 18.2 MPa across the pump. The turbine and pump have isentropic efficiencies of 82 and
77%, respectively. For the cycle, determine (a) the net work per unit mass of steam flow, in kJ/kg. (b) the
heat transfer to steam passing through the boiler, in kJ per kg of steam flowing. (c) the thermal
efficiency. (d) the heat transfer to cooling water passing through the condenser, in kJ per kg of steam
condensed.
In t he preliminary design of a power plant, water is chosen as the working fluid and it is determined
that the turbine inlet temperature may not exceed 520C. Based on expected cooling water
temperatures, the condenser is to operate at a pressure of 0.06 bar. Determine the steam generator
pressure required if the isentropic turbine efficiency is 80% and the quality of steam at the turbine exit
must be at least 90%.
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