A rigid container and a piston contains 1L of R-134a at 100 o C and 3.6 MPa. In an isobaric quasi-equilibrium process, the gas expands to 1.2L. The control volume has a uniform cross section 0.5 m2 and the piston can only move up and down. Ignore friction for simplicity. 

(a) The critical temperature and pressure of R-134a are 374.2 K and 4.06 MPa, respectively. Is ideal gas law reliable for this process? 

(b) What is the compressibility factor at the beginning of this process? 

(c) What is the compressibility factor at the reduced temperature of 0.8 and 3.6 MPa? 

(d) Interpolate the answers from (b) and (c) to get an estimation for the compressibility factor as a function of temperature through this process. 

(e) What are the work done and the final temperature? 

(f) Two point interpolation can be a rough estimate. How can you potentially improve the accuracy of the methodology we used in this question? 

Answer rating: 100% (QA)

Solution a Ideal Gas Law Reliability No the ideal gas law is not reliable for this process R134a operates at a pressure 36 MPa close to its critical p... View the full answer