Steam enters an engine at a pressure 10 bar.. solved problem




Steam enters an engine at a pressure 10 bar absolute and 400°C. It is exhausted at 0.2 bar. The steam at exhaust is 0.9 dry. Find : (i) Drop in enthalpy ; (ii) Change in entropy.





Steam enters an engine at a pressure 10 bar absolute and 400°C. It is exhausted at 0.2 bar. The steam at exhaust is 0.9 dry. Find :

(i) Drop in enthalpy ;

(ii) Change in entropy.

Steam enters an engine at a pressure 10 bar.. solved problem
Steam enters an engine at a pressure 10 bar.. solved problem




1. Two boilers one with superheater and other without superheater are delivering equal quantities of steam into a common main. The pressure in the boilers and main is 20 bar. The temperature of steam from a boiler with a superheater is 350°C and temperature of the steam in the main, is 250°C.

Determine the quality of steam supplied by the other boiler. Take cps = 2.25 kJ/kg.

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2. Determine the entropy of 1 kg of wet steam at a pressure of 6 bar and 0.8 dry, reckoned from freezing point (0°C).

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3. Steam enters an engine at a pressure 10 bar absolute and 400°C. It is exhausted at 0.2 bar. The steam at exhaust is 0.9 dry. Find :

(i) Drop in enthalpy ;

(ii) Change in entropy.

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4. Find the entropy of 1 kg of superheated steam at a pressure of 12 bar and a temperature of 250°C. Take specific heat of superheated steam as 2.1 kJ/kg K.

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5. A piston-cylinder contains 3 kg of wet steam at 1.4 bar. The initial volume is 2.25 m3. The steam is heated until its temperature reaches 400°C . The piston is free to moue up or down unless it reaches the stops at the top. When the piston is up against the stops the cylinder volume is 4.65 m3. Determine the amount of work and heat transfer to or from steam.

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