FUND OF ENG THERMODYN(LLF)+WILEYPLUS
9th Edition
ISBN: 9781119391777
Author: MORAN
Publisher: WILEY
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A closed system undergoes a cycle consisting of three process 1-2, 2-3 and 3-1. Given that Q12 = 30kJ, Q23 = 10 kJ, 1w2 = 5 kJ, 3w2 = 5 kJ and DE31 = 15 kJ, Evaluate Q31, w23, DE12 and DE23.
A gas within a piston-cylinder assembly executes a Carnot power cycle during which the isothermal expansion occurs at TH = 500 K and the isothermal compression occurs at TC = 290 K.
Determine:
(a) the thermal efficiency.
(b) the percent change in thermal efficiency if TH increases by 5% while TC remains the same.
(c) the percent change in thermal efficiency if TC decreases by 5% while TH remains the same.
(d) the percent change in thermal efficiency if TH increases by 5% and TC decreases by 5%.
A gas within a piston-cylinder assembly executes a Carnot power cycle during which the isothermal expansion occurs at TH = 500 K
and the isothermal compression occurs at Tc = 290 K.
Determine:
(a) the thermal efficiency.
(b) the percent change in thermal efficiency if TH increases by 15% while Tc remains the same.
(c) the percent change in thermal efficiency if Tc decreases by 15% while TH remains the same.
(d) the percent change in thermal efficiency if TH increases by 15% and Tc decreases by 15%.
Part A
Determine the thermal efficiency.
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