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

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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