{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

# HW14s - Spring 2006 Thermodynamics Homework 14 Solution 1...

This preview shows pages 1–3. Sign up to view the full content.

Spring 2006 1 ME 201 Thermodynamics Homework 14 Solution 1. Consider the Carnot cycle occurring in a piston-cylinder device containing refrigerant-134a with operating conditions given below: Process A: Isothermal heat addition at T H = 30 ° C to convert saturated liquid to saturated vapor Process B: Isentropic and adiabatic expansion to T L = -20 ° C Process C: Isothermal heat removal at -20 ° C Process D: Isentropic and adiabatic compression back to the initial state With R-134a as the working fluid for this cycle calculate the thermal efficiency using η th net in = W Q Compare this to the ideal Carnot cycle efficiency given by η Carnot L H = 1 - T T Solution: We shall make our calculations process by process Process A Working Fluid: R-134a(compressible) System: Closed System Process: Isothermal State 1 State 2 T 1 = 30°C T 2 = 30°C P 1 = 770.64 kPa P 2 = 770.64 kPa v 1 = 0.0008421 m 3 /kg v 2 = 0.026622 m 3 /kg u 1 = 92.93 kJ/kg u 2 = 246.14 kJ/kg s 1 = 0.34789 kJ/(kg K) s 2 = 0.91879 kJ/(kg K) phase: sat.liq . phase: sat.vap. italicized values from tables Initial State: Fixed

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
ME 201 Thermodynamics Spring 2006 2 Final State: Fixed W sh = 0 Q = ????
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern