Question 12.180E: R-410A is a 1:1 mass ratio mixture of R-32 and R-125. Find t...

Fundamentals of Thermodynamics-Solution Manual [EXP-6595]

R-410A is a 1:1 mass ratio mixture of R-32 and R-125. Find the specific volume at 80 F, 200 psia using Kays rule and the generalized charts and compare to Table F.9

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Kay’s rule Eq.12.84

\begin{aligned}& P _{ c  mix }=0.5 \times 838+0.5 \times 525=681.5   psia \\& T _{ c  mix }=0.5 \times 632.3+0.5 \times 610.6=621.45   R\end{aligned}

Reduced properties: $P _{ r }=\frac{200}{681.5}=0.293, \quad T _{ r }=\frac{539.67}{621.45}=0.868$

Table F.1: R = 1545.36 / 72.585 = 21.29 lbf-ft/lbm-R
Fig. D.1: Z = 0.82

v =\frac{ ZRT }{ P }=\frac{0.82 \times 21.29 \times 539.67}{200 \times 144} \frac{ lbf – ft / lbm }{ psi \times in ^{2} / ft ^{2}}= 0 . 3 2 7   f t ^{3} / lbm

Table F.9: $v = 0 . 3 1 7 4 ~ f t ^{ 3 } / lbm$

………………………………………….

Eq.12.84 : $\left(P_{c}\right)_{\operatorname{mix}}=\sum_{i} y_{i} P_{c i}, \quad\left(T_{c}\right)_{\operatorname{mix}}=\sum_{i} y_{i} T_{c i}$

F.1

F.1'

F.9.1

F.9.1'

F.9.1''

F.9.1'''

D.1

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