![]() You could always try this which I think is the correct equations behind the steam tablesĮco = bet ^ 2 + nreg4(3) * bet + nreg4(6)įco = nreg4(1) * bet ^ 2 + nreg4(4) * bet + nreg4(7) RE: How to calculate Tsat when given a pressure athomas236 (Mechanical) 22 Jun 06 15:28 I wish I had been born 30 years later life would have been much easier in engineering. All you have to do is ask - and that is one of the functions this Forum has as its goal: furnish an "asking" platform. I know Harvey and I have had accurate ones for years now. With the advent of readily available thermodynamic databases such as NIST, timbones' comment about there not being an equation has become history. The result is as "accurate" as you're going to get in the USA - mainly because it's authoritative and backed up by NIST. The result is a mathematical equation for saturated steam that I use in Visual Basic programs I write sometimes. I can choose the resulting equation(s) I wish, depending on the accuracy and range I opt for. I take the tabular results and regress the data using my favorite regression program, DataFit. I use present-day, free, authoritative and readily accessible thermodynamic properties for water available at: I do the same, except I use a technique that has proven much more accurate and flexible than V Ganapathy's 1986 version. Harvey is absolutely correct in logic and technique. RE: How to calculate Tsat when given a pressure Montemayor (Chemical) 22 Jun 06 13:14 For example, this short cut gives the temperature for 15 bar(abs) steam as 196.8 C, but a more accurate formula will give 198.3 C The answer is within 1 or 2 degrees for "normal" plant pressures. ![]() ![]() ![]() This is easy to do with a hand held calculator because you enter the pressure in bar(abs), hit the square root button twice, and mutiply by 100. T = Ax + B/x + C(x^0.5) + D(ln(x)) + E(x^2) + F(x^3) + Gįor quick estimates in the field you can use Ganapathy references his source as V Gonzales-Pozo, Chem Eng, May 12, 1986, pg 123. One that I use from time to time was published by V Ganapathy, Hydrocarbon Processing, Nov 1988, pgs 105-108. Dozens of these formulas have been developed. ![]()
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