Steam enters the high-pressure turbine of a steam power plant that operates on the ideal reheat Rankine cycle at 800 psia and 900 °F and leaves as saturated vapor. Steam is then reheated to 800 deg F before it expands to a pressure of 1 psia. Heat is transferred to the steam in the boiler at a rate of 6x104 Btu/s. Steam is cooled in the condenser by the cooling water from a nearby river, which enters the condenser at 45 °F. Show the cycle on a T-s diagram with respect to saturation lines. Determine also the following: the pressure at which reheating takes place, the net power output and thermal efficiency, and the minimum mass flow rate of the cooling water required. A. 741.0 Ibm/s, 39.4%, 62.23 psia B. 641.0 Ibm/s, 49.4%, 62.23 psia C. 641.0 Ibm/s, 39.4%, 62.23 psia D. 641.0 Ibm/s, 39.4%, 72.23 psia

Steam enters the high-pressure turbine of a steam power plant that operates on the ideal reheat Rankine cycle at 800 psia and 900 °F and leaves as saturated vapor. Steam is then reheated to 800 deg F before it expands to a pressure of 1 psia. Heat is transferred to the steam in the boiler at a rate of 6x104 Btu/s. Steam is cooled in the condenser by the cooling water from a nearby river, which enters the condenser at 45 °F. Show the cycle on a T-s diagram with respect to saturation lines. Determine also the following: the pressure at which reheating takes place, the net power output and thermal efficiency, and the minimum mass flow rate of the cooling water required. A. 741.0 Ibm/s, 39.4%, 62.23 psia B. 641.0 Ibm/s, 49.4%, 62.23 psia C. 641.0 Ibm/s, 39.4%, 62.23 psia D. 641.0 Ibm/s, 39.4%, 72.23 psia

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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