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Re: [EnergyPlus_Support] How define n50 ifiltration
If you know the ACH at 50 pascals, you need to convert that information
to the ACH at normal building pressure. Here in Florida we use a factor
of 40 (which would mean ACH = 0.025 at normal building pressure), in the
rest of the United States the factor is 20 (which would mean ACH =
0.05). The different factors represent the differences in altitude,
local average wind speed, stack effect, etc. So in Florida, 2.5% of the
total building volume is exchanged each hour (m3/hr) and then that
number would have to be converted to m3/s (divide by 3600).
There are tables in the Residential Energy book by Krigger (pg 286 in
the appendix) that specify the factors used for other locations, but for
other countries, I am not sure where that information would be found.
v s wrote:
>
>
> Dear all.,
>
> I want to have an input for infiltration 1ACH for a pressure of 50
> Pascal (n50).
> How this can be done?
>
> Thanks
> vaggelis
>
> ------------------------------------------------------------------------
> *From:* Richard Raustad <RRaustad@xxxxxxxxxxxx>
> *To:* EnergyPlus_Support@xxxxxxxxxxxxxxx
> *Sent:* Friday, July 10, 2009 4:11:10 PM
> *Subject:* Re: [EnergyPlus_Support] Output analysis : Zone Air Balance
> Surface Convection Rate
>
> If you want to know the definition of any report variable, search for it
> in the Input Output Reference document. Here is what I found:
>
> The Zone Air Balance Surface Convection Rate is the sum, in watts, of
> heat transferred to the zone air from all the surfaces. This field is
> not multiplied by zone or group multipliers.
>
> I don't think that Window Convection Heat Gain from Glazing to Zone is
> included in the Zone Air Balance Surface Convection Rate. Leave the
> glazing gain out and see if the numbers match up better.
>
> le_carambar wrote:
> >
> >
> > Dear users,
> >
> > I try to understand what is include in the output variable : Zone Air
> > Balance Surface Convection Rate.
> >
> > I did the sum of the "Surface Int Convection Heat Rate" for every
> > surfaces (1 ext wall, 3 interzone surfaces, 1 roof, 1 floor) and
> > "Window Convection Heat Gainfrom Glazing to Zone". And the result is
> > not the same value than "Zone Air Balance Surface Convection Rate".
> >
> > I check output variable "Window Gap Convective Heat Flow" and "Window
> > Convection Heat Gain from Gap between Shade and Glazing to Zone " but
> > they are equal to 0.
> >
> > Can you help me ?
> >
> > thanks,
> >
> > Camille T.
> >
> >
>
> --
> Richard A. Raustad
> Senior Research Engineer
> Florida Solar Energy Center
> University of Central Florida
> 1679 Clearlake Road
> Cocoa, FL 32922-5703
> Phone: (321) 638-1454
> Fax: (321) 638-1439 or 1010
> Visit our web site at: http://www.fsec. ucf.edu <http://www.fsec.ucf.edu>
>
> UCF - From Promise to Prominence: Celebrating 40 Years
>
>
>
--
Richard A. Raustad
Senior Research Engineer
Florida Solar Energy Center
University of Central Florida
1679 Clearlake Road
Cocoa, FL 32922-5703
Phone: (321) 638-1454
Fax: (321) 638-1439 or 1010
Visit our web site at: http://www.fsec.ucf.edu
UCF - From Promise to Prominence: Celebrating 40 Years
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