If the minimum and maximum allowed refrigerant pressures
Chapter 11, Problem 19P(choose chapter or problem)
The p–y–T relation for chlorofluorinated hydrocarbons can be described by the Carnahan–Starling–DeSantis equation of state
\(\frac{p \bar{v}}{\bar{R} T}=\frac{1+\beta+\beta^{2}-\beta^{3}}{(1+\beta)^{3}}-\frac{a}{\bar{R} T(\bar{v}+b)}\)
where \(\beta=b / 4 \bar{v}, \ a=a_{0}\) exp \(\left(a_{1} T+a_{2} T^{2}\right)\), and \(b=b_{0}+b_{1} T+b_{2} T^{2}\). For Refrigerants 12 and 13, the required coefficients for T in K, a in \(\mathrm{J} \cdot \mathrm{L} /(\mathrm{mol})^{2}\), and b in L/mol are given in Table P11.19. Specify which of the two refrigerants would allow the smaller amount of mass to be stored in a \(10-\mathrm{m}^{3}\) vessel at 0.2 MPa, \(80^{\circ} \mathrm{C}\).
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