Thermodynamics

MECH 332 Thermodynamics Prob. Set 3 (Chap. 3) Lecturer: Dr. W.R. Johnson Fall 2014 Due September 22rd

Complete the tables as indicated. Show calculations on separate work pages.

1. Find from the steam tables the saturation temperature or pressure as indicated (i.e. fill in the blanks)

Tsat, oC PSat, kPa Tsat, oC PSat, kPa

1 40 5 270

2 60 6 6,000

3 110 7 360

4 110 8 21,000

2. Determine the phase of the steam (compress liquid, saturated liquid, saturation mixture, saturated vapor,

superheated vapor, or supercritical vapor). For 2.1-2.7 use Table A-5, for 2.8-2.14 use Table A-4.

T, oC P Region T, oC P, kPa Phase Description

1 99 100 kPa 8 80 51.486

2 100 100 kPa 9 110 55.732

3 150 500 kPa 10 160 618.23

4 225 1500 kPa 11 210 1901.0

5 250 5 MPa 12 260 3970.2

6 250 22 MPa 13 310 8590.0

7 250 50 MPa 14 400 8590.0

4. Complete this table for H2O:

State T, oC P, kPa v, m3/kg u, kJ/kg Calculate

(u+Pv) h, kJ/kg s, kJ/kg-K x

4.1 240 .7

4.2 225 0.070

4.3 1000 2300

Locate the 3 states on the same T-v chart used in question 3.

5 Complete this table for refrigerant-134a:

T, oF P, psia h, Btu/lbm x, quality Phase description

1 80 78

2 15 0.6

3 10 70

4 180 129.46 (N/A)

5 110 1.0

3. Complete this table for H2O:

State T, oC P, kPa h, kJ/kg x, quality Phase description

3.1 500 0.80

3.2 200 2200

3.3 1200 0.0

3.4 100 1,000

3.5 800 3162.2

Locate the 5 states on the T-v chart (Tv_600__h_P_x__LOD_2.pdf).