Q1// The steam at 100 bar, 500 °C is supplied to a steam turbine of 30MW output power. The vacuum reading on the condenser is 710 mmHg when the barometer reads 760 mmHg. The work developed is equivalent to isentropic enthalpy drop during expansion in the turbine. The steam coming out of the turbine is condensed using river water for cooling. The inlet and outlet temperatures of the cooling water are 20 °C and 30 °C respectively. The condensate comes out of the condenser as a saturated liquid and the over all heat transfer coefficient is 470W/m. °C. Calculate assuming 100% vacuum efficiency : 1. The mass flow rate of steam supplied to the turbine. 2. The mass flow rate of cooling water. 3. The heat transfer area of the condenser.

Q1// The steam at 100 bar, 500 °C is supplied to a steam turbine of 30MW output power. The vacuum reading on the condenser is 710 mmHg when the barometer reads 760 mmHg. The work developed is equivalent to isentropic enthalpy drop during expansion in the turbine. The steam coming out of the turbine is condensed using river water for cooling. The inlet and outlet temperatures of the cooling water are 20 °C and 30 °C respectively. The condensate comes out of the condenser as a saturated liquid and the over all heat transfer coefficient is 470W/m. °C. Calculate assuming 100% vacuum efficiency : 1. The mass flow rate of steam supplied to the turbine. 2. The mass flow rate of cooling water. 3. The heat transfer area of the condenser.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Problem (8.1) The steam at 100 bar and 500°C is supplied to a steam turbine of 30 MW capacity. The vacuum maintained in the condenser is 71 cm of Hg when the barometer reads 76 cm of Hg. The steam coming out of the turbine is condensed in a surface condenser using river water for cooling. The rise in temperature of the cooling water is limited to 10°C. The temperature of the water at the inlet of the condenser is 20°C. The condensate comes out of condenser as saturated liquid. Find (a) the mass of steam supplied to the turbine per hour, (b) Capacity of the pump to circulate water, (c) the heat transfer area of the condenser if the overall heat transfer coefficient is 400 W/m²°C.
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