[Bldg-sim] wetbulb formula

[Dusko Nikolic]

 Hi there,

Spreadsheet is attached that does exactly what you want to do. If you 
unprotected the sheet you will see how the wb formula is used.


Regards




________________________________
From: Alec Stevens <astevens at dmiinc.com>
To: bldg-sim at lists.onebuilding.org
Sent: Fri, 10 December, 2010 11:43:23 AM
Subject: [Bldg-sim] wetbulb formula


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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