Sample_Problems_3

Sample_Problems_3 - Sample Problems #3 (Chapter 4) Ismet...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Sample Problems #3 (Chapter 4) Ismet Ugursal, J.M. Chuang Dalhousie University Dept. of Mechanical Engineering September 27, 2009 Engi2800 Engineering Thermodynamics I Problems (Textbook 7 th Ed.) Questions Page Topics 4.58 118 4.61 118 4.101 121 Rate of Work 4.118 122 Review Problems Polytropic Process Boundary Work: Multistep Process Prob. 4.58 Polytropic Process Consider a piston cylinder with 0.5 kg of R-134a as saturated vapor at . It is now compressed to a pressure of 500 kPa in a polytropic process with . Find the final volume and temperature, and determine the work done during the process. Solution: Take CV as the R-134a which is a control mass. Process: until State 1: From Table B.5.1 ( see slide #4 ) State 2: ( P , process) From B.5.2, for given : it is superheated vapor at Process gives , which is integrated for the work term, Eq.(4.5), p. 95 m 2 = m 1 = m ( T; x ) P = Cv 1 : 5 1 W 2 = Z PdV = m 1 1 : 5 ( P 2 v 2 P 1 v 1 ) n = 1 : 5 ( P; v ) P = 500kPa = 7 : 07kJ 10 o C v 2 = v 1 ( P 1 =P 2 ) 1 = 1 : 5 = 0 : 09921 (201 : 7 = 500) 2 = 3 = 0 : 05416 m 3 = kg ( see slide #5 ) Pv 1...
View Full Document

Page1 / 10

Sample_Problems_3 - Sample Problems #3 (Chapter 4) Ismet...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online