Niagara AX- Need a Pressure Temperature Conversion block

[droptchevy]

Does anyone have refrigerant pressure temperature logic blocks or something they can share with me? I need to control exv's from superheat directly in the jace. I was trying to play around with writing something in the program editor but my skill level is not up to par with line by line code.

[Right Control]

Can you just use a PID those work well in kit control. Or a reset??

[droptchevy]

Yea I am going to use a pid but I need the chart to know what the superheat is. I would need 50 reset blocks to try to make this so I'd rather write a custom module

[Right Control]

Any suction pressure transducers?? Suction line temp?? This could all help. R-22?? 410??

[lwarren]

I have a program object for R22.

[klrogers]

Lane I would be interested in that program too


Thanks


Kevin


Email in my profile

Sent from my DROID RAZR using Tapatalk 2

[lwarren]

Shoot me an email and I will send it to you. It took me forever to find the right equation for this and then when I did I had trouble getting it in the program object and functioning correctly. I have to give the final credit to Ron aka Codewriter for getting it completed for me. You can set the input to PSIG,PSIA, or KPA.

[MatrixTransform]

I have a program object for R22.

PV=mRT ... hmm would like a look at the program object too if poss.

[controlgeek]

I would be interested in a copy as well.

tia

[lwarren]

I don't see your email listed Matrix. Whoever wants it just send me an email.

[droptchevy]

Any suction pressure transducers?? Suction line temp?? This could all help. R-22?? 410??

yes i have suction pressure transducers and suction line temp. This is r134, but i can take the r-22 table and edit all the values to change it to 134.

[jcipaul]

I would appreciate a copy, thank you.

[Alpha_LHYC]

Me too, I would appreciate a copy of this program object. Thank you!

[DaveCR]

This can be done with kitControl math blocks and a little help from excel's Trendline feature. Copy and paste the temperature vs pressure values in to excel. Convert to PSIA and Deg R (curve fitting works better). Create a graph and try the various Trendlines until you get a good fit. I came up with this for R134a. y = 0.00003561 x^3 - 0.01308796 x^2 + 2.12259171 x + 421.11910836 With x = PSIA and a range of 20.7 to 149.7 and y = deg R.

[22nomo]

Could I get a copy of the program objects also, email is in my profile, Thank you.

[MatrixTransform]

I came up with this for R134a. y = 0.00003561 x^3 - 0.01308796 x^2 + 2.12259171 x + 421.11910836 ]

nice work ... though I think it maybe time to make a generic curve-fit Program Object to the 4th or 5th order.

...maybe even have an Enum setting for different refrigerants

[DaveCR]

Thanks. For 134a:
y = 9.20621E-10 x^5 - 6.26875E-07 x^4 + 1.65989E-04 x^3 - 2.26106E-02 x^2 + 2.14070E+00 x - 1.32707E+01
Input pressure range (PSIA) 14.7 to 244.7. Output °R. This turns out to be quite a good fit with R squared = 0.9999

[noskilltech]

This can be done with kitControl math blocks and a little help from excel's Trendline feature. Copy and paste the temperature vs pressure values in to excel. Convert to PSIA and Deg R (curve fitting works better). Create a graph and try the various Trendlines until you get a good fit. I came up with this for R134a. y = 0.00003561 x^3 - 0.01308796 x^2 + 2.12259171 x + 421.11910836 With x = PSIA and a range of 20.7 to 149.7 and y = deg R.

I've been attempting to set this up all morning for R410A and I can't seem to figure out for the life of me how to get it to output properly. I know lynxspring has an actual conversion block in their lynxKitControl, but unfortunately it only works with their certificate on the JACE.

Anyone else sucessfully made this work for 410?

[lwarren]

I've been attempting to set this up all morning for R410A and I can't seem to figure out for the life of me how to get it to output properly. I know lynxspring has an actual conversion block in their lynxKitControl, but unfortunately it only works with their certificate on the JACE.

Anyone else sucessfully made this work for 410?

I have a program object for 134 that you could probably change the pressure-temp tables in for 410.

[noskilltech]

I'll send you an email here in just a second. Thanks