[Bldg-sim] Fan formula System 1 & 2 ASHRAE 90.1 - 2007

[Chris Yates]

Yes, it appears to be part of the SI edition that hasn't been fully
converted from IP.

For System 7 (I haven't done a system 1 or 2), I used the SI calc and found
that it matched the fan power of a VAV system in E+ with 1300Pa pressure
drop and about 70% fan efficiency. You just have to do half of the calc in
IP units!

-----Original Message-----
From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Jason Glazer
Sent: 27 January 2010 14:46
To: bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] Fan formula System 1 & 2 ASHRAE 90.1 - 2007

The IP version is correct.

Jason

On 1/27/2010 7:56 AM, Jaigath Chandraprakash wrote:
> Hi All,
>
>
> Appendix G3.1.2.9 of ASHRAE 90.1-2007 gives the formula for systems 1 &
> 2: Pfan = CFMs x 0.3 where CFMs is the supply fan airflow rate in cfm
> and Pfan is in watts. I just noticed that in SI version, the formula is
> the same Pfan = CFMs x 0.3 where Pfan is also in watts but CFMs is in
> lps. Which is version correct? I have already looked into the erratas
> and addendum but did not find any corrections.
>
>
> Thank you all in advance.
>
>
> Jaigath Chandraprakash
>
>
>
>
>
>
> _______________________________________________
> Bldg-sim mailing list
> http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org
> To unsubscribe from this mailing list send  a blank message to
BLDG-SIM-UNSUBSCRIBE at ONEBUILDING.ORG

-- 
Jason Glazer, P.E., GARD Analytics, 90.1 ECB chair
Admin for onebuilding.org building performance mailing lists
_______________________________________________
Bldg-sim mailing list
http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org
To unsubscribe from this mailing list send  a blank message to
BLDG-SIM-UNSUBSCRIBE at ONEBUILDING.ORG