Question 2 In a steam plant, the steam leaves the boiler at 2.0 MN/m and at...

 

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Question 2 In a steam plant, the steam leaves the boiler at 2.0 MN/m and at a temperature of 250 °C. it is then expanded in an engine and finally exhausted into a condenser. The pressure and the condition of the steam at entry to the condenser are 14 KN/m and 0.82 dry, respectively. Assuming the whole of the enthalpy drop is converted into useful work in the engine. Determine, a) The power developed for the steam flow of 15 000 kg/h b) The thermal efficiency of the engine if the feed temperature is 50 °C Estimate the mass of cooling water circulated in the condenser /kg of steam condensed, if the cooling water enters at 18 °C and leaves at 36 °C and the condensates leaves at 50 °C. how much energy is lost from the condensate/h due to its being cooled below the saturation temperature corresponding to the condenser pressure. [3.055 MW, 27.3%, 26.1 kg/kg steam, 156000 kJ/h] Question 2 In a steam plant, the steam leaves the boiler at 2.0 MN/m and at a temperature of 250 °C. it is then expanded in an engine and finally exhausted into a condenser. The pressure and the condition of the steam at entry to the condenser are 14 KN/m and 0.82 dry, respectively. Assuming the whole of the enthalpy drop is converted into useful work in the engine. Determine, a) The power developed for the steam flow of 15 000 kg/h b) The thermal efficiency of the engine if the feed temperature is 50 °C Estimate the mass of cooling water circulated in the condenser /kg of steam condensed, if the cooling water enters at 18 °C and leaves at 36 °C and the condensates leaves at 50 °C. how much energy is lost from the condensate/h due to its being cooled below the saturation temperature corresponding to the condenser pressure. [3.055 MW, 27.3%, 26.1 kg/kg steam, 156000 kJ/h]