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

[Dan Barclay]

Paul,

Realistically, just reset your "cool setpoint" and "warm setpoint" based on
humidity high and low limits.   Figure out how much the humidity needs to
change for you to notice it, and use those for the humidity trips.  When the
humidity trips, reset the temps.

Dan 

> -----Original Message-----
> From: hai-users-bounces at tssi.com [mailto:hai-users-bounces at tssi.com] On
> Behalf Of Paul Whyte
> Sent: Tuesday, November 01, 2005 9:23 PM
> To: 'Mike Nolan'; hai-users at romaine.tssi.com
> Subject: RE: [Hai-users] Temperature & Humidity sensor (fwd)
> 
> Looks like an uphill battle given the tool we have to work with (PC
> Access!!!). I take it nobody has any creative code they wish to share that
> deals with this issue (and overcomes HAI's programming limitations)?
> 
> Paul
> 
> -----Original Message-----
> From: hai-users-bounces at tssi.com [mailto:hai-users-bounces at tssi.com] On
> Behalf Of Mike Nolan
> Sent: November 1, 2005 10:09 PM
> To: hai-users at romaine.tssi.com
> Subject: Re: [Hai-users] Temperature & Humidity sensor (fwd)
> 
> > If anyone has access to an ASHRAE book the enthalpy chart is in there.
> > It's not a simple algorithm. If you see the chart you'll know why,
> > nothing linear about it. However, since memory is cheap these days and
> > with some constraints on the input variables (limit the temperature
> > and humidity inputs to reasonable values) you could probably come up
> with
> a lookup table.
> > Would take some time but you'd only have to do it once.
> 
> I haven't done thermodynamic calculations since I was an undergrad at
> Northwestern.  :-)
> 
> I don't have the book, here's a paper that includes an enthalpy graph.
> It should be possible to pull several values directly off the table and
> interpolate enough to build a simple table.
> 
> http://ohioline.osu.edu/aex-fact/0120.html
> 
> And here's a site that you can download a humidity calculation app from.
> You will need IE with Active-X enabled:
> http://www.thunderscientific.com/web_humicalc/index.php
> --
> Mike Nolan
> 
> _______________________________________________
> HAI-users mailing list
> HAI-users at tssi.com
> http://romaine.tssi.com/mailman/listinfo/hai-users
> 
> 
> 
> 
> _______________________________________________
> HAI-users mailing list
> HAI-users at tssi.com
> http://romaine.tssi.com/mailman/listinfo/hai-users