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 thesurroundings which is at 0.98 bar, 20°C. Neglecting kinetic and potential energy changes, determine per kgof 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 ]

Given: T1= 520oC P1= 5 bar T2= 300oC P2=1 bar T0= 20oC To determine: The decrease in availability…

Answered: (i) The decrease in availability; ii)…

Engineering

Mechanical Engineering

(i) The decrease in availability; ii) The maximum work; ii) The irreversibility.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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Concept explainers

Basic Thermodynamic Processes

The word 'thermodynamics' can be divided into two words, 'thermo' and 'dynamics'. The word thermo deals with the heat and thermal phenomenon, whereas dynamics deals with forces or external agent that drives the heat flow or aids in the motion of heat.

Question

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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