Steam Tables Process Overview
Fundamentals of Engineering Thermodynamics
th
9 Edition by Moran, Shapiro, Boettner, and Bailey, 2018
Given
Properties
Test to Determine Region of
Vapor Dome
Look up p in Table A-3/3E:
Vapor Dome Diagram
T
Tc
a. If T < Tsat, Compressed liquid
b. If T = Tsat, Two-phase, liquidvapor mixture
c. If T > Tsat, Superheated vapor
d. If T > Tc, Superheated vapor
1. p
2. T
●
p
c
•
T > Tsat
b
T = Tsat
T < Tsat a •
v
Look up T in Table A-2/2E:
a. If p > psat, Compressed liquid
b. It p = psat, Two-phase, liquidvapor mixture
c. If p < psat, Superheated vapor
1. p
2. T
T
p
a
p > psat
•
b
p = psat
p < psat
c
•
v
Look up T in Table A-2/2E:
1. T
2. v, u, h, or s
a. If v < vf, Compressed liquid
b. If vf < v < vg, Two-phase,
liquid-vapor mixture
c. If v > vg, Superheated vapor
1. p
2. v, u, h, or s
a. If v < vf, Compressed liquid
b. If vf < v < vg, Two-phase,
liquid-vapor mixture
c. If v > vg, Superheated vapor
a
b
T •
c
•
•
v<vf
v
vg
vf<v<vg
v>vg
a
b
c
p •
•
•
v<vf
vg
vf<v<vg
v
T
b
vf
p
1. p
2. x
b. Two-phase, liquid vapor
mixture
a. Table A-5/5E or Table
A-2/2E (approximate as
saturated liquid)
b. Table A-3/3E and quality
(x) calculations below
c. Table A-4/4E
p
x
b. Two-phase, liquid vapor
mixture
a. Table A-5/5E or Table
A-2/2E (approximate as
saturated liquid)
b. Table A-2/2E and quality
(x) calculations below
c. Table A-4/4E
v>vg
T
1. T
2. x
a. Table A-5/5E or Table
A-2/2E (approximate as
saturated liquid at T)
b. T and p are not
independent; need another
property
c. Table A-4/4E
p
vf
Apply the same procedure if
u, h, or s is given.
a. Table A-5/5E or Table
A-2/2E (approximate as
saturated liquid)
b. T and p are not
independent; need another
property
c.&d. Table A-4/4E
T
vf
Apply the same procedure if
u, h, or s is given.
Look up p in Table A-3/3E:
Where/How to Obtain
Properties
b. Table A-2/2E and quality
(x) calculations below
•
v
vg
v
T
b. Table A-3/3E and quality
(x) calculations below
x
p
b
vf
•
v
vg
v
Quality Calculations (Eqs. 3.2, 3.6, 3.7, and 6.4)
x
v  vf
vg  vf
v = vf + x(vg – vf)
x
u  uf
ug  uf
u = uf + x(ug – uf)
x
h  hf
h  hf

hg  hf
hfg
h = hf + x(hg – hf) = hf + xhfg
x
s  sf
sg  sf
s = sf + x(sg – sf)