[Hai-users] Temperature & Humidity sensor (fwd)

[Mike Nolan]

> I know that we didn't have barometric pressure in our algorithm, yet the
> results always seemed to match the chart. It makes sense that pressure is
> required though. Hopefully the algorithm can be found and resurrected!
> 
> As I said we used it in commercial buildings in Phoenix. When we introduced
> it number of temperature complaints by building tenants was reduced a great
> deal.

I doubt that the day-to-day differences in barometric pressure would 
make enough change in the enthalpy at a given temperature and relative 
humidity to make a perceptable difference in comfort, since that's a 
rather relative term.  It might make more of a difference at higher 
altitudes.  

If you were dealing with steam tunnels in commercial building complexes 
you would have needed to take the pressure into account, or at least that's
what I remember from my thermodynamics course in around 1970, and the 
primary reason I mentioned it earlier is that the web app I gave includes 
it as one of the variables.  
--
Mike Nolan