Find the missing properties of P, v, u, and x and the

Chapter 3, Problem 73HP

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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

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)


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