Tag Archives: curve fitting

The Steam Table Form… Finally!

Posted on April 25, 2016 by R.P. Churchill

About two months ago I started making a web form that allowed a user to calculate thermodynamic values for saturated water as functions of either temperature and pressure. I got sidetracked for quite a while working on the graphing capability … Continue reading →

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Extending the Thermodynamic Functions To Their Full Range: Functions vs. Pressure

Posted on April 21, 2016 by R.P. Churchill

While finishing up the process of generating the plots of the thermodynamic functions vs. pressure I found an issue with how plots are drawn on the x-axis when the x-axis has a logarithmic scale. I calculated numeric values for every … Continue reading →

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Extending the Thermodynamic Functions To Their Full Range

Posted on April 20, 2016 by R.P. Churchill

Today I extended all 24 functions to their full range, 0-705.44 °F and 0.08866-3203.6 psi. I’ve shown the functions vs. temperature; the functions vs. pressure are generally derived from the same lines in the steam tables so the only difference … Continue reading →

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Fixing the Thermodynamic Functions for Saturated Water As A Function of Temperature

Posted on April 19, 2016 by R.P. Churchill

I’ve updated five of the thermodynamic property functions vs. temperature. Note that most of these define properties only up to a bit above 600 °F and, more importantly, to 1800 psi. The values for saturated water are defined up to … Continue reading →

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Steam Table Functions, Curve Fitting, and Yes, the Graph Project

Posted on April 13, 2016 by R.P. Churchill

I’m finally detouring back to fixing the handful of errant segments in the steam table functions I created for my simulation work in the early 90s. This graph, originally posted on March 16th, shows a hiccup in the segment from … Continue reading →

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Reverse Engineering Or… What Was It I Was Trying To Do There?

Posted on February 23, 2016 by R.P. Churchill

While continuing the process of turning the JavaScript graph widget into an object I found I needed to create labels of various kinds, which you see added in the examples below. I also wanted to test out some more of … Continue reading →

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Checking My Steam Table Functions

Posted on February 17, 2016 by R.P. Churchill

While I was working out a steam table page yesterday I found it necessary to graph the functions out as a means of verifying them.  Here’s the first graph I created in JavaScript.  It shows not only the curve of … Continue reading →

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Steam Tables (and Thermodynamic Properties of Fluids In General)

Posted on February 16, 2016 by R.P. Churchill

A little while ago I was ruminating on the subject of needing to know the thermodynamic properties of materials before you could do simulations of those materials. I therefore figured I’d spend the week dusting off some old functions I’d … Continue reading →

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