Steam Megawatt-hours calculation
Steam Megawatt-hours calculation
(OP)
Hi All,
I have been tasked to specify a function block for our control system that uses the pressure (bar a), temperature (degC) and flow (kg s-1) to obtain a Megawatt-hours (energy) value for steam exported. I have had a look at various research papers and cant find a straight cut answer. Any help would be greatly appreciated.
Thanks
James
I have been tasked to specify a function block for our control system that uses the pressure (bar a), temperature (degC) and flow (kg s-1) to obtain a Megawatt-hours (energy) value for steam exported. I have had a look at various research papers and cant find a straight cut answer. Any help would be greatly appreciated.
Thanks
James





RE: Steam Megawatt-hours calculation
RE: Steam Megawatt-hours calculation
If you can't get a ready made module, you could probably make a simple linear model yourself if the pressure and temperature ranges aren't too wide. Do a linear regression of the data from the steam tables for the steam enthalpy over the ranges (Excel will do this for you), and then multiply by the mass flow rate to give the energy per time.
Katmar Software - Uconeer 3.0
http://katmarsoftware.com
"An undefined problem has an infinite number of solutions"
RE: Steam Megawatt-hours calculation
Since posting this I have contacted our site DCS guys who have made a block in fb cad for this purpose!
RE: Steam Megawatt-hours calculation
RE: Steam Megawatt-hours calculation
Enthalpy of steam * flow * 2.7E-7 = Energy in MWh
The enthalpy of steam is calculated by our DCS using a function block with inputs: pressure and temperature.
This allows the use of the temp, pressure and flow to calculate the energy in a steam process stream.
RE: Steam Megawatt-hours calculation