Using u?h Data For each case, determine the specified

Chapter 3, Problem 43P

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QUESTION:

For each case, determine the specified property value and locate the state by hand on sketches of the p-v and T-v diagrams.

(a) For Refrigerant 134a at \(T=160^{\circ} \mathrm{F}, h=127.7 \mathrm{Btu} / \mathrm{lb}\). Find v, in \(\mathrm{ft}^3 / \mathrm{lb}\).

(b) For Refrigerant 134a at \(T=90^{\circ} \mathrm{F}, u=72.71 \mathrm{Btu} / \mathrm{lb}\). Find h, in Btu/lb.

(c) For ammonia at \(T=160^{\circ} \mathrm{F}, p=60 \mathrm{lbf} / \mathrm{in} .{ }^2\) Find u, in Btu/lb.

(d) For ammonia at \(T=0^{\circ} \mathrm{F}, p=35 \mathrm{lbf} / \mathrm{in}^2{ }^2\) Find u, in Btu/lb.

(e) For Refrigerant 22 at \(p=350 \mathrm{lbf} / \mathrm{in}^2, T=350^{\circ} \mathrm{F}\). Find u, in Btu/lb.

Questions & Answers

QUESTION:

For each case, determine the specified property value and locate the state by hand on sketches of the p-v and T-v diagrams.

(a) For Refrigerant 134a at \(T=160^{\circ} \mathrm{F}, h=127.7 \mathrm{Btu} / \mathrm{lb}\). Find v, in \(\mathrm{ft}^3 / \mathrm{lb}\).

(b) For Refrigerant 134a at \(T=90^{\circ} \mathrm{F}, u=72.71 \mathrm{Btu} / \mathrm{lb}\). Find h, in Btu/lb.

(c) For ammonia at \(T=160^{\circ} \mathrm{F}, p=60 \mathrm{lbf} / \mathrm{in} .{ }^2\) Find u, in Btu/lb.

(d) For ammonia at \(T=0^{\circ} \mathrm{F}, p=35 \mathrm{lbf} / \mathrm{in}^2{ }^2\) Find u, in Btu/lb.

(e) For Refrigerant 22 at \(p=350 \mathrm{lbf} / \mathrm{in}^2, T=350^{\circ} \mathrm{F}\). Find u, in Btu/lb.

ANSWER:

Step 1 of 5

(a)

Obtain the properties of the refrigerant  at  and , from superheated vapor tables of refrigerant  :

Pressure,

Obtain the properties of the refrigerant  at  and  from

Super-heated vapor tables of refrigerant 134 .

Specific volume,

Therefore, the specific volume of superheated refrigerant  is .

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