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Find the missing properties of P, v, u, and x and the
Chapter 3, Problem 73HP(choose chapter or problem)
Problem 73HP
Find the missing properties of P, v, u, and x and the phase of ammonia, NH3.
a. T = 65°C, P = 600 kPa
b. T = 20°C, P = 100 kPa
c. T = 50°C, v = 0.1185 m3/kg
Questions & Answers
QUESTION:
Problem 73HP
Find the missing properties of P, v, u, and x and the phase of ammonia, NH3.
a. T = 65°C, P = 600 kPa
b. T = 20°C, P = 100 kPa
c. T = 50°C, v = 0.1185 m3/kg
ANSWER:
Solution 73HP
Part (a)
Step 1 of 3:
We are going to find the specific volume, the specific internal energy, and the quality of ammonia (NH3) for the given pressure and temperature.
The given temperature T = 65°C
The given pressure P = 600 kPa
From the table B.2.2, at 600 kPa, we have to find the specific volume and specific internal energy using interpolation method.
S.No |
T (x) |
v (y) |
u (z) |
1 |
60 |
0.25981 |
1425.7 |
2 |
70 |
0.26888 |
1444.3 |
3 |
65 |
y3 |
z3 |
The specific volume v = 0.2644 m3/kg
Similarly
The specific internal energy u = 1435 kJ/kg
The saturated temperature at 600 kPa (Tsat) = 9.28°C
Since T > Tsat, the state of ammonia is superheated vapor. There is no quality for this state. Therefore the quality is undefined.
Part (b)