8th Edition

ISBN: 9780077624811

Author: CENGEL

Publisher: MCG

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Chapter 9.12, Problem 124P

Repeat Prob. 9–123 using argon as the working fluid.

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Chapter 9.12, Problem 123P

Chapter 9.12, Problem 125P

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3. Show that the thermal efficiency of the Carnct cycle in terms of the isentropic compression ratio r is given by e = 1-1. k-1

The working fluid of a liquid-vapor cycle is 1kg of R-134a (Hint: Use the R-134a thermodynamic tables.) The cycle operates between two pressures 100kPa and 1000kPa. Process A-B: An isobaric compression at the high pressure from a saturated vapor to a saturated liquid. • ProcessB-C: An iso-entropic process from the high pressure to the low pressure. • Process C-D: An isobaric expansion at the low pressure. •Process D-A: An iso-entropic process from the low pressure to the high pressure. •a) Make a table of the temperature, pressure, volume, internal energy, enthalpy, entropy and quality factor (T, P, V, U, H, S & x) at the start of each process. b) Make a table of the change in internal energy, heat flow, work done, change in enthalpy, and change in S) during each leg of the cycle.AH, AU, Q, W, Aentropy (c) Draw a well-labeled T-S diagram (indicating lines of constant pressure and the saturation dome.) d) Calculate the coefficient of performance of the cycle "nglish (United States)

The working fluid of a liquid-vapor cycle is 1kg of R-134a. The cycle operates between two pressures 100kPa and 1200kPa. • Process A-B: An isobaric compression at the high pressure to a saturated liquid. • Process B-C: An iso-entropic process from the high pressure to the low pressure. • Process C-D: An isobaric expansion at the low pressure to a saturated vapor. • Process D-A: An iso-entropic process from the low pressure to the high pressure. a) Make a table of the temperature, pressure, volume, internal energy, enthalpy, entropy and quality factor (T, P, V, U, H, S & x) at the start of each process. b) Make a table of the change in internal energy, heat flow, work done, change in enthalpy, and change in entropy (AU, Q, W, AH, AS) during each leg of the cycle. c) Draw well-labelled P-V & T-S diagrams (indicating lines of constant pressure, the saturation dome, heat flow, work, etc.) d) Calculate the coefficient of performance of the cycle (Q₁ / W).

Chapter 9 Solutions

Thermodynamics: An Engineering Approach

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Repeat Prob. 9–123 using argon as the working fluid.

Solution Summary: The author explains the mass flow rate of air through the cycle and the temperature and pressure relation for the isentropic process 1-2.

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