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Re: [EnergyPlus_Support] How define n50 ifiltration
I assumed the ACH at 50 pascals would apply towards infiltration.
The infiltration object is called "ZoneInfiltration:DesignFlowRate"
In an AirlfowNetwork simulation, this infiltration object is not used.
Instead the flow pressure relationship is defined
Q= c DeltaP ^n and assuming n=0.65
Since you know Q, DeltaP and n, you can back calculate c with your data.
Read the documentation for AirflowNetwork in the IO Ref and Eng Ref.
v s wrote:
>
>
> How can i enter this imformation to E+?
> In the "natural ventilation and duct leakage", at "airflownetwork
> multizone component detailed opening"
> how can i define the "air mass flow coefficient when opening is closed"?
> If i suppose that i have 0.001 kg/sec/m of opening, should i put this
> number there?
> Because the difference between the factors 40 and 20 is large, since i
> cannot find the exact factor for my place, Greece.
>
> Thank you Richard.
>
> 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@FSEC. UCF.EDU
> <mailto:RRaustad%40FSEC.UCF.EDU>>
> > *To:* EnergyPlus_Support@ yahoogroups. com
> <mailto:EnergyPlus_Support%40yahoogroups.com>
> > *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://ucf.edu>
> <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 <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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