Superheated steam at 20 MPa, 560 deg C enters the turbine of a vapor power plant. The pressure at the exit of the turbine is 0.5 bar, and liquid leaves the condenser at 0.4 bar at 75 deg C. The pressure is increased to 20.1 MPa across the pump. The turbine and pump have isentropic efficiencies of 81% and 85%, respectively. Cooling water enters the condenser at 20 deg C with a mass flow rate of 70.7 kg/s and exits the condenser at 38 deg C. For the cycle, determine (a) the mass flow rate of steam, in kg/s. (b) the thermal efficiency.
Superheated steam at 20 MPa, 560 deg C enters the turbine of a vapor power plant. The pressure at the exit of the turbine is 0.5 bar, and liquid leaves the condenser at 0.4 bar at 75 deg C. The pressure is increased to 20.1 MPa across the pump. The turbine and pump have isentropic efficiencies of 81% and 85%, respectively. Cooling water enters the condenser at 20 deg C with a mass flow rate of 70.7 kg/s and exits the condenser at 38 deg C. For the cycle, determine (a) the mass flow rate of steam, in kg/s. (b) the thermal efficiency.
Refrigeration and Air Conditioning Technology (MindTap Course List)
8th Edition
ISBN:9781305578296
Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Chapter28: Special Refrigeration Applications
Section: Chapter Questions
Problem 15RQ: Why is two-stage compression popular for extra-low-temperature refrigeration systems?
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Superheated steam at 20 MPa, 560 deg C enters the turbine of a vapor power plant. The pressure at the exit of the turbine is 0.5 bar, and liquid leaves the condenser at 0.4 bar at 75 deg C. The pressure is increased to 20.1 MPa across the pump. The turbine and pump have isentropic efficiencies of 81% and 85%, respectively. Cooling water enters the condenser at 20 deg C with a mass flow rate of 70.7 kg/s and exits the condenser at 38 deg C. For the cycle, determine
(a) the mass flow rate of steam, in kg/s.
(b) the thermal efficiency.
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