Explanation Given: For the process ‘a’, The heat Q = + 50 J The energy at state 1, E 1 = − 20 J Energy difference Δ E = + 70 J For the process ‘b’, Work done W = + 20 J Energy at state 2, E 2 = + 50 J Energy difference Δ E = + 30 J For the process ‘c’, Work done W = − 60 J Energy at state 2, E 1 = + 40 J Energy difference E 2 = + 60 J For the process ‘d’, The heat Q = − 40 J Energy at state 1, E 1 = + 50 J Energy difference Δ E = 0 J For the process ‘e’, The heat Q = + 50 J Work done W = + 150 J Energy difference E 2 = − 80 J A closed system can be defined as the system in which the transfer of energy happens, maybe in the form of work or heat, but does not transfer the fluid or mass within its surrounding. The energy balance for the closed system is given by: E 2 − E 1 = Q − W E 2 − E 1 is the change in energy present across the system for some time interval. Q is the net energy is transferred in the system boundary by the heat transfer during some time interval. W is the net energy is transferred out across the system boundary by work during the time interval. Calculation: Considering the unit of each quantity is in J, For the process ‘a’ Energy difference for the process ‘a’ can be given as: Δ E = E 2 − E 1 + 70 J = E 2 − ( − 20 J ) The energy at state 2, E 2 = + 50 J From the energy balance equation, + 50 J − ( − 2 0

FUND OF ENG THERMODYN-WILEYPLUS NEXT GEN

9th Edition

ISBN: 9781119840589

Author: MORAN

Publisher: WILEY

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FUND OF ENG THERMODYN-WILEYPLUS NEXT GEN

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