[Bldg-sim] wetbulb formula

[R B]

You should be able to find these routines in the HVAC Toolkit book - sold by
ashrae. I don't have it handy so not sure if you can use the routine
directly in excel - you might need visual basic. I have done this previously
in matlab, C++
-Rohini

On Thu, Dec 9, 2010 at 4:43 PM, Alec Stevens <astevens at dmiinc.com> wrote:

> Hi,
>
> Does anyone have an Excel-friendly equation they would be willing to share
> that can convert Tdb and RH into Twb?  We have metered data giving us Tdb,
> RH, and Tdp, but we need to know wetbulb.  We usually solve this problem
> with an Excel psychrometric add-in, but we need to distribute this
> spreadsheet to a client and cannot distribute the add-in at the same time.
>
>
>
> We’ve tried a couple of multivariable regressions on the data, but because
> it is nonlinear, it is not proving to be that straightforward.  Next stop
> might be a two-way lookup table, but that is kind of cumbersome and was
> hoping to avoid it.
>
>
>
> Any help much appreciated.
>
>
>
> Sincerely,
> Alec Stevens
>
>
>
> DMI
> 35 Walnut Street, Wellesley, MA 02481
> p: 781 431 1100 x11   f:781 431 1109
> e: astevens at dmiinc.com
>
>
>
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-- 
--------------------------------------------------------------------------------
Rohini Brahme, Ph.D. LEED AP
Building energy analysis, tool development, and training
Dallas/Fort Worth, TX
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