Download - MET 211 steam-tables
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Steam Tables
Chapter 5
Dr.Khaled S. Al-Zahrani
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Steam Formation
T°C
H
-20 - a
0 -b c
d e
f
S S+L L L+V V
100 -
S = SolidL = LiquidV = Vapour
Sensib
le
Sensib
le
Sensib
le
Latent
Latent
374 -Critical Point
Saturated Vapour
Saturated Liquid1 Bar
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Steam Formation
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Mollier Chart
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Mollier Chart
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Steam TablesSteam tables commonly consist of two sets of tables of the energy transfer properties of water and steam:
1. saturated steam tables
I. Temperature basis
II. Pressure basis
2. superheated steam tables
Both sets of tables are tabulations of pressure (P)temperature (T)specific volume (v)specific internal energy (u)specific enthalpy (h)specific entropy (s)
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The following notation is used in steam tables.T : temperature (°C)P : pressure (bar)v : specific volume (m3/kg)u: specific internal energy (kJ/kg)h: specific enthalpy (kJ/kg)s: specific entropy (kJ/kg K)
Steam Tables
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Important points
1. Steam tables give values for 1 kg of water and 1 kg of steam.
2. The steam table gives values of properties from the triple point of
water to the critical point of steam.
3. If pressure is known use the table on pressure basis.
4. If temperature is known use the table on temperature basis.
5. At low pressure the volume of saturated (vf) liquid is very small as
compared to the volume of dry steam and usually the specific
volume of liquid is neglected.
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Definitions
Sub cooled or compressed: is a fluid under thermodynamic
conditions that force it to be a liquid
Saturated liquid: fully in the liquid state but is about to vaporize
Wet steam: When steam contains water in the form of fine water
particles suspended in steam
Dry steam: When steam contains no moisture.
Saturated steam: is steam at equilibrium with liquid water
Superheated steam: a steam heated above its (boiling point)
saturation point
Qality (x): quantity of dry steam in 1 kg of wet steam
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Steam Formation
vspecific volume
uspecific internal energy
hspecific enthalpy
sspecific entropy
v = (1 – x) vf + xvg
vf is neglected
v = x vg
u = (1 – x) uf + x ug
u = uf + x (ug– uf)
u = uf + x ufg
h = (1 – x) hf + x hg
h = hf + x (hg – hf)
h = hf + x hfg
s = (1 – x) sf + x sg
s = sf + x (sg – sf)
s = sf + x sfg
Sub cooled water (A) Saturated liquid (B) (x = 0) Evaporation of saturated liquid (B-C) 10x
Wet steam (F) x Dry Saturated steam (C) ) (x = 1) Superheated steam (D)
masstotal
massvapourx
A
D T
F B
s
C
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Group WorkUsing your Thermodynamic Properties of Fluids Tables, determine.
1. The specific enthalpy of: i. Saturated water at a temperature of 130 C⁰ ,
ii. Dry saturated steam at a temperature of 130 C ⁰
2. The saturated water pressure at 130 C. ⁰3. The specific volume of dry saturated steam at a pressure of
2.7bar.
4. The specific enthalpy of steam at a pressure of 2.7 bar and x =0.9.
5. The specific enthalpy of steam at pressure of 20 bar and a temperature of 400 C ⁰
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Assignment
Fill in the tables in the given handout