phinds said:So you will be supplied with tables that no one has told you how to use? Really?
smoothie king said:i have changed the question around
Chestermiller said:Let me understand correctly. You have steam tables, and you know that you have water at 5 bars with an internal energy of 2724 kJ/kg, and you are asked to determine its entropy. Is that right?
Chet
Superheated SteamChestermiller said:You found a place in the tables where the pressure is 500 kPa. What is the heading on the top of the page (e.g., saturated steam or superheated steam)?
Chet
OK. Now there are columns of numbers on the page. What are the headings on the columns of numbers?smoothie king said:Superheated Steam
Chestermiller said:OK. Now there are columns of numbers on the page. What are the headings on the columns of numbers?
Chet
What are the headings on the other columns (or rows?)?smoothie king said:They are all temperatures from 100°c to 700°c
Chestermiller said:What are the headings on the other columns (or rows?)?
Chet
I thought you said that the part of the table you were open to was for superheated steam. This table is for saturated steam. What gives?smoothie king said:there is t(sat), then h and s for all the temperatures above. also hg and sg for saturation
Chestermiller said:I thought you said that the part of the table you were open to was for superheated steam. This table is for saturated steam. What gives?
Chet
Sounds about right.smoothie king said:i have two tables and i didn't notice, i have one with h and s, another with u and v, i just realized that i have to find the value for temperature in the u and v table using internal energy, then use that temperature to find the value of entropy in the h and s table. I got the value of entropy to be 7.272.
Thank you very much!
A steam table is a graphical representation of the thermodynamic properties of water and steam. It is used to determine the internal energy, enthalpy, and other properties of water and steam at different temperatures and pressures.
To find the internal energy using a steam table, you must first determine the temperature and pressure of the water or steam. Then, locate the corresponding values on the steam table and use interpolation to find the internal energy.
The internal energy of water or steam is an important property in thermodynamics as it represents the total energy of the system. It is used to calculate other thermodynamic properties and is essential in many engineering applications, such as power generation and refrigeration.
The steam table is a reliable and accurate tool for determining the internal energy of water and steam. However, it is important to note that the values on the steam table are based on ideal conditions and may not account for all variables in a real-world system.
While the steam table is a useful tool, it has some limitations. It may not accurately represent the properties of water or steam under extreme conditions, such as very high temperatures or pressures. Additionally, the steam table may not account for non-ideal behavior, such as the presence of impurities in the water or steam.