saultgeorge
Lifetime Supporting Member
Morning, folks. I hope I get some views on this and maybe a reply. I'm reaching out to the best of the best here.
I'm writing logic for some Air Handling Units (AHU's) for a customer that has contracted us to do so. I'm using RS5k v. 20.04
Anyway, to be brief, I need to perform an enthalpy calculation on outside air temp and humidity percent, which are the only 2 values I get into the logic.
If you'll note the 2 links, the equation gives you the result in kJ/kg, which I don't know how to relate to the temp. I am using the one from wiki without steam tables. I have absolutely no problem using the equation in the logic and doing the math, I just don't understand how to use the result. The reason for this routine is that an AHU can use outside air to help with cooling without using the chilled water at certain outside temps. But if the humidity is too high, even though the outside temp is low, say 50, then it would do no good to bring in that air. There will probably be some kind of a comparison I will have to make. I have emailed the engineers that do this and that sent me the links, but no reply so far. Any enlightenment is more than I have now. Thanks in advance, folks. Happy Monday.
https://sciencing.com/calculate-enthalpy-air-6118694.html
https://www.wikihow.com/Calculate-the-Enthalpy-of-Moist-Air
I'm writing logic for some Air Handling Units (AHU's) for a customer that has contracted us to do so. I'm using RS5k v. 20.04
Anyway, to be brief, I need to perform an enthalpy calculation on outside air temp and humidity percent, which are the only 2 values I get into the logic.
If you'll note the 2 links, the equation gives you the result in kJ/kg, which I don't know how to relate to the temp. I am using the one from wiki without steam tables. I have absolutely no problem using the equation in the logic and doing the math, I just don't understand how to use the result. The reason for this routine is that an AHU can use outside air to help with cooling without using the chilled water at certain outside temps. But if the humidity is too high, even though the outside temp is low, say 50, then it would do no good to bring in that air. There will probably be some kind of a comparison I will have to make. I have emailed the engineers that do this and that sent me the links, but no reply so far. Any enlightenment is more than I have now. Thanks in advance, folks. Happy Monday.
https://sciencing.com/calculate-enthalpy-air-6118694.html
https://www.wikihow.com/Calculate-the-Enthalpy-of-Moist-Air