[Equest-users] defining the windows for natural ventilation

[Paul Diglio]

Noa:

You can select natural ventilation in eQuest under the Air-Side  HVAC System 
Parameters, Outdoor Air, Natural Ventilation.  I would use the Sherman-Grimsrud 
method.  From eQuest help - "Sherman-Grimsrud" method in which the air change 
rate depends on  wind speed, inside-outside temperature difference, and wind 
shielding of the  building. In this case, the keywords MAX-VENT-RATE, 
HOR-VENT-FRAC, and  FRAC-VENT-AREA are applicable.

Therefore I would calculate the vent area (window opening) and set up a 
fractional schedule to account for the percent the windows are opened throughout 
the occupied schedule. 


 Paul Diglio, CEM, CBCP


87 Fairmont Avenue
New Haven, CT  06513
203-415-0082


www.pdigliollc.com




________________________________
From: Daniel Knapp <danielk at arborus.ca>
To: noa at gbwawa
Cc: equest-users at lists.onebuilding.org
Sent: Thu, April 25, 2013 9:59:36 AM
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, LEED® 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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