In a turbine air expands from 5 bar, 520°C to 1 bar, 300°C. During expansion 10 kJ/kg of heat is lost to the surroundings which is at 0.98 bar, 20°C. Neglecting kinetic and potential energy changes, determine per kg of air : (i) The decrease in availability; (ii) The maximum work; (iii) The irreversibility. For air take : e, = 1.005 kJ/kg K ; h = e T, where c, is constant. (Ans. (i) 260.7 kJ/kg ; (ii) 260.7 kJ/kg ; (iii) 49.6 kJ/kg ]
In a turbine air expands from 5 bar, 520°C to 1 bar, 300°C. During expansion 10 kJ/kg of heat is lost to the surroundings which is at 0.98 bar, 20°C. Neglecting kinetic and potential energy changes, determine per kg of air : (i) The decrease in availability; (ii) The maximum work; (iii) The irreversibility. For air take : e, = 1.005 kJ/kg K ; h = e T, where c, is constant. (Ans. (i) 260.7 kJ/kg ; (ii) 260.7 kJ/kg ; (iii) 49.6 kJ/kg ]
Elements Of Electromagnetics
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Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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![17. In a turbine air expands from 5 bar, 520°C to 1 bar, 300°C. During expansion 10 kJ/kg of heat is lost to the
surroundings which is at 0.98 bar, 20°C. Neglecting kinetic and potential energy changes, determine per kg
of air :
(i) The decrease in availability;
(ii) The maximum work ;
(iii) The irreversibility.
For air take : c, = 1.005 kJ/kg K ; h = c,T, where e, is constant.
(Ans. (i) 260.7 kJ/kg ; (ii) 260.7 kJ/kg ; (iüi) 49.6 kJ/kg ]](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F81276731-cada-440b-8703-43014b2cbd48%2F9070414b-7d66-4cce-b5c6-e9a91f8dce5a%2Fvxhpgk_processed.jpeg&w=3840&q=75)
Transcribed Image Text:17. In a turbine air expands from 5 bar, 520°C to 1 bar, 300°C. During expansion 10 kJ/kg of heat is lost to the
surroundings which is at 0.98 bar, 20°C. Neglecting kinetic and potential energy changes, determine per kg
of air :
(i) The decrease in availability;
(ii) The maximum work ;
(iii) The irreversibility.
For air take : c, = 1.005 kJ/kg K ; h = c,T, where e, is constant.
(Ans. (i) 260.7 kJ/kg ; (ii) 260.7 kJ/kg ; (iüi) 49.6 kJ/kg ]
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