The Steam Tables 1. Determine the vapor pressure, specific internal energy, and specific enthalpy of saturated steam at 133.5°C. 2. Show that water at 400°C and 10 bar is superheated steam and determine its specific volume, specific internal energy, and specific enthalpy relative to liquid water at the triple point, and its dew point. 3. Show that Û and Ĥ for superheated steam depend strongly on temperature and relatively slightly on pressure.
The Steam Tables 1. Determine the vapor pressure, specific internal energy, and specific enthalpy of saturated steam at 133.5°C. 2. Show that water at 400°C and 10 bar is superheated steam and determine its specific volume, specific internal energy, and specific enthalpy relative to liquid water at the triple point, and its dew point. 3. Show that Û and Ĥ for superheated steam depend strongly on temperature and relatively slightly on pressure.
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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I need help with this especially 2.
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Example 7.5-2
Example 7.5-3
+
parentheses the boiling-point temperature and in Columns 2 and 3 the properties of saturated
quid water and saturated steam/at that pressure. If you are at a point in the superheated steam
egion, you can move all the way to the left to determine the saturation temperature at the same
pressure, also known as the dew point of the superheated steam.
The next example illustrates the use of these tables to obtain physical property data for water.
The Steam Tables
391 of 695
1. Determine the vapor pressure, specific internal energy, and specific enthalpy of saturated steam at
133.5°C.
Solution Verify the results to be given.
2. Show that water at 400°C and 10 bar is superheated steam and determine its specific volume, specific
internal energy, and specific enthalpy relative to liquid water at the triple point, and its dew point.
3. Show that Û and Ĥ for superheated steam depend strongly on temperature and relatively slightly on
pressure.
Q Search
1. Table B.5 does not go up to 133.5°C, so we turn to Table B.6. For saturated steam at the given
temperature (Column 2),
p* = 3.0 bar, V = 0.606 m³/kg, Û = 2543.0 kJ/kg, Ĥ = 2724.7 kJ/kg
2. From Table B.7, [T = 400°C, P = 10 bar] falls outside the closed region, showing that water is
superheated steam at this temperature and pressure. The table also shows that at this condition,
Ĥ = 3264 kJ/kg, Û = 2958 kJ/kg, V = 0.307 m³/kg, Tdp = 179.9°C
3. Look at the properties of water at 400°C and 450°C, both at a pressure of 10 bar. You will see that
both Û and Ĥ change by about 3% when water goes from the first temperature to the second one
(3264 kJ/kg → 3371 kJ/kg for Ĥ, 2958 kJ/kg → 3041 kJ/kg for Û).
Now consider the properties at 10 bar and 20 bar, both at a temperature of 400°C. Even though
the pressure has doubled, the values of Û and Ĥ change by much less than 1%. Similar results would
be obtained for liquid water. The conclusion is that when you need a value of Û or Ĥ for water (or for
any other species) at a given T and P, you must look it up at the correct temperature-interpolating if
necessary but you don't have to find it at the exact pressure.
The next example illustrates the use of the steam tables to solve energy balance problems.
Energy Balance on a Steam Turbine
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Example 7.5-2
Example 7.5-3
+
parentheses the boiling-point temperature and in Columns 2 and 3 the properties of saturated
quid water and saturated steam/at that pressure. If you are at a point in the superheated steam
egion, you can move all the way to the left to determine the saturation temperature at the same
pressure, also known as the dew point of the superheated steam.
The next example illustrates the use of these tables to obtain physical property data for water.
The Steam Tables
391 of 695
1. Determine the vapor pressure, specific internal energy, and specific enthalpy of saturated steam at
133.5°C.
Solution Verify the results to be given.
2. Show that water at 400°C and 10 bar is superheated steam and determine its specific volume, specific
internal energy, and specific enthalpy relative to liquid water at the triple point, and its dew point.
3. Show that Û and Ĥ for superheated steam depend strongly on temperature and relatively slightly on
pressure.
Q Search
1. Table B.5 does not go up to 133.5°C, so we turn to Table B.6. For saturated steam at the given
temperature (Column 2),
p* = 3.0 bar, V = 0.606 m³/kg, Û = 2543.0 kJ/kg, Ĥ = 2724.7 kJ/kg
2. From Table B.7, [T = 400°C, P = 10 bar] falls outside the closed region, showing that water is
superheated steam at this temperature and pressure. The table also shows that at this condition,
Ĥ = 3264 kJ/kg, Û = 2958 kJ/kg, V = 0.307 m³/kg, Tdp = 179.9°C
3. Look at the properties of water at 400°C and 450°C, both at a pressure of 10 bar. You will see that
both Û and Ĥ change by about 3% when water goes from the first temperature to the second one
(3264 kJ/kg → 3371 kJ/kg for Ĥ, 2958 kJ/kg → 3041 kJ/kg for Û).
Now consider the properties at 10 bar and 20 bar, both at a temperature of 400°C. Even though
the pressure has doubled, the values of Û and Ĥ change by much less than 1%. Similar results would
be obtained for liquid water. The conclusion is that when you need a value of Û or Ĥ for water (or for
any other species) at a given T and P, you must look it up at the correct temperature-interpolating if
necessary but you don't have to find it at the exact pressure.
The next example illustrates the use of the steam tables to solve energy balance problems.
Energy Balance on a Steam Turbine
■
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