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Thread: NH3 Conversion Help
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22-06-2010, 04:41 PM #1
NH3 Conversion Help
I know that for a given Pressure you have a given temperture. What i need help with is the math formula top get to the temperture with a given pressure. I'm trying to write a PLC program and need this forumla. I have tryed google and all i came up with was the chart. I need the math behind the chart. Thanks for your help
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22-06-2010, 04:51 PM #2
Re: NH3 Conversion Help
Pick 10 points, put them in excel, regress the curve, export the coefficient of the polynomial.
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22-06-2010, 04:56 PM #3
Re: NH3 Conversion Help
We have tried that and it works for temperature to pressure. It doesn't seem to work for pressure to temperature. Thanks for the response. Any further help would be great!
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22-06-2010, 06:52 PM #4
Re: NH3 Conversion Help
It depends whether you are in a single phase or two phase area of the state diagram.
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14-08-2010, 11:30 PM #5
Re: NH3 Conversion Help
Hello Festerbot
Did you ever suceed with this calculation? I do have a mitsi plc with the program installed but it was never really good as there were times that it was so inaccurate that the superheat was negative. If you did suceed can you help me with this?
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15-08-2010, 10:57 AM #6
Re: NH3 Conversion Help
Maybe you need more points...Do you want covered superheat and subcooling regions or only saturated temperatures?
To make progress is never good enough, I want to do better and better and better
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