[Equest-users] defining the windows for natural ventilation

[Jason Quinn]

eQuest does calculate light through exterior windows into a zone and reduce
electrical light usage. It uses a split flux method that when compared to
Radiance can over/under estimate the effect but it is a great first order
tool (my opinion). Be aware that it only has light into the first zone with
exterior windows - other zones will only "feel" the light as conductive
heat transfer through the matched zone boundaries. There is a sunspace
module in DOE2 that might work if you need to bring daylight more into
central zones but I never sorted that out.

eQuest is much faster for daylighting studies than E+ and OpenStudio right
now. I've switched and miss the ease of eQuest on daylight harvesting. Once
my ruby is up to scratch I'll automate it similar to eQuest (or maybe
someone else will) but until that point assigning sensor locations and
setting up daylight harvesting in E+/OS is much more time consuming. E+ can
model using similar methods to eQuest and can use interior windows to allow
light to pass from an exterior zone to the next zone to the interior.

Jason Quinn
+64 21 1846 911


On Fri, Apr 26, 2013 at 3:07 AM, noa at gbwawa <noa at gbwawa.com> wrote:

> Are you sure about that?
> How about natural lighting? Does it calculate it?
>
> -----Original Message-----
> From: Daniel Knapp [mailto:danielk at arborus.ca]
> Sent: Thursday, April 25, 2013 4:59 PM
> To: noa at gbwawa
> Cc: equest-users at lists.onebuilding.org
> Subject: Re: [Equest-users] defining the windows for natural ventilation
>
> Hi Noa,
>
> My understanding is that eQuest does not calculate natural ventilation at
> all.  The program is not designed to support calculations of the movement
> of
> air between zones.  The outdoor air flow in the HVAC window is outdoor air
> introduced by the mechanical system and not through windows.  I think you
> would be better off looking to another tool (maybe EnergyPlus/OpenStudio?)
> that explicitly supports these calculations.
>
> All the best,
> Dan
>
>
> -
> Daniel Knapp, PhD, P Phys, LEEDR AP O+M
> danielk at arborus.ca
>
> Arborus Consulting
> Energy Strategies for the Built Environment www.arborus.ca
> 76 Chamberlain Avenue
> Ottawa, ON, K1S 1V9
> Phone: (613) 234-7178 ext. 113
> Fax: (613) 234-0740
>
>
>
>
> On 2013-04-24, at 11:12 AM, noa at gbwawa <noa at gbwawa.com> wrote:
>
> > Hi all,
> >
> > I just understood that e-Quest dosn't calculate natural ventilation
> without making some definitions.
> > I found that in the detailed mode, in the HVAC window, I can define the
> outdoor air flow, but how do I define what is the area of the window that
> opens? It could be only half of the window area or all of it for example.
> > So what are the parameters that I need to fill out in order to be exact
> in
> the natural ventilation definition? And where could I find it?
> >
> > Thank you
> >
> > Noa Hakak,
> >
> > Green building project manager
> > WAWA
> > _______________________________________________
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>
>
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