Steam Tables Process Overview F un dame damental ntal s of En ginee gineeri ri ng Thermodynamics th
8 Edition by Moran, Shapiro, Boettner, and Bailey, 2014 Given Properties
Test to Determine Region of Vapor Dome Look up p in in Table A-3/3E:
Vapor Dome Diagram T T c
a. If T < < T sat sat, Compressed liquid b. If T = = T sat sat, Two-phase, liquidvapor mixture c. If T > > T sat sat, Superheated vapor d. If T > T c, Superheated vapor
1. p 2. T
Where/How to Obtain Properties
p
●
c T > T sat
•
T = T sat T < T sat a
b •
a. Table A-5/5E or Table A-2/2E (approximate as saturated liquid) b. T and p and p are are not independent; need another property c.&d. Table A-4/4E
v
Look up T in in Table A-2/2E:
a. If p If p > > p psat, Compressed liquid b. It p It p = = p psat, Two-phase, liquidvapor mixture c. If p If p < < p psat, Superheated vapor
1. p 2. T
T
p
a
p > psat
•
b
p = psat p < psat
c
•
v
Look up T in in Table A-2/2E:
a. If v < vf , Compressed liquid b. If vf < v < vg, Two-phase, 1. T liquid-vapor mixture 2. v, u, u, h, h, or s s c. If v > vg, Superheated vapor
T
T
a
b
•
•
c
•
vf
Apply the same procedure if u , h , or s is is given. Look up p in in Table A-3/3E:
a. If v < vf , Compressed liquid b. If vf < < v < vg, Two-phase, 1. p liquid-vapor mixture 2. v, u, u, h, h, or s s c. If v > vg, Superheated vapor
v
v
vg v
p
p
a
b
•
•
c
•
v
v
vg v
p x
b. Two-phase, liquid vapor mixture
T
b
v
v
vg
T
p
b. Two-phase, liquid vapor mixture
b. Table A-2/2E and quality ( x) x) calculations below
•
vf
1. p 2. x
a. Table A-5/5E or Table A-2/2E (approximate as saturated liquid) b. Table A-3/3E and quality ( x) x) calculations below c. Table A-4/4E
>vg
vf
T
1. T 2. x
a. Table A-5/5E or Table A-2/2E (approximate as saturated liquid) b. Table A-2/2E and quality ( x) x) calculations below c. Table A-4/4E
>vg
vf
vf
Apply the same procedure if , h , or s is is given. u
a. Table A-5/5E or Table A-2/2E (approximate as saturated liquid at T ) b. T and p and p are are not independent; need another property c. Table A-4/4E
b. Table A-3/3E and quality ( x) x) calculations below
x p
•
b
vf
v
v
vg
Quality Calculations (Eqs. 3.2, 3.6, 3.7, and 6.4)
x
v
vg
vf
vf
= vf + x + x((vg – vf )
v
x
u
ug
uf
uf
u = uf + x + x((ug – uf )
x
h
hg
hf
hf
h
hf
hfg
h = hf + x + x((hg – hf ) = hf + xh + xhfg
x
s sf
sg sf
s = s = s sf + x + x(( s sg – s sf )
