[Equest-users] Inquiry Regarding No Energy Usage for Ventilation Outdoor Air

[Mark Rasmussen]

Howdy Daniel,

Thank you for the reply, it is very appreciated.

Yes, we know that the ventilation load doesn't show up in any of the
standard eQuest reports (such as LS-C Building Peak Load Components)
because they don't show up in the DOE-2.2 engine reports either, which 
are the source of the eQuest reports.

However, our question pertains to the end use Natural Gas Consumption which only 
shows Natural Gas Usage due to losses from Conduction (we verified this by 
manual calculation). The Natural Gas Usage projected by the energy model
does not include any Natural Gas Usage from the ventilation air (with outdoor air).

Any idea what programming issue could prevent the end use Natural Gas Usage
from Ventilation with Outdoor Air from being included in the end use analysis?
I have been trying for a long time, and can't locate the issue. The problem is 
causing an issue with our project timeline now, so I need to get this issue solved
very soon.

Thanks & Best Wishes!
Mark


________________________________
 From: Daniel Knapp <danielk at arborus.ca>
To: Mark Rasmussen <markfrazz at yahoo.com> 
Cc: "equest-users at lists.onebuilding.org" <equest-users at lists.onebuilding.org> 
Sent: Tuesday, May 21, 2013 12:56 PM
Subject: Re: [Equest-users] Inquiry Regarding No Energy Usage for Ventilation Outdoor Air
 

Hi Mark,

The loads report which shows the conduction losses does not include loads from the HVAC systems.  The ventilation load doesn't show up in any of the standard eQuest reports.  This is because eQuest is based on DOE-2.2 which runs in sequence every hour as LOADS -> HVAC -> ECON.  LOADS calculates the loads on every space in the building according to a constant indoor space temperature and the outdoor weather conditions and then passes this information to HVAC which uses it to calculate the required response from the systems.  The load reporting comes out of LOADS before HVAC does its work.  I recommend digging into the DOE-2.2 documentation for more information.

There is probably a way to separate out the ventilation load in the hourly reporting functions.  It's something I'm looking into but haven't figured out yet.  Let me know if you find an easy way to do this.  

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 2013-05-21, at 1:13 PM, Mark Rasmussen <markfrazz at yahoo.com> wrote:

> To Whom May Be So Kind,
> 
> We are currently creating an Energy Model using eQuest for LEED NC v2.2 
> for a facility that will consist of restaurants and a bar/lounge. According to 
> LEED NC v2.2, we need to use a Packaged Single Zone (PSZ-AC)
> system for the baseline case energy model.
> 
> Currently, the energy model results for Space Heating only show usage resulting
> from Conduction Losses and not from Ventilation using Outdoor Air. This is confusing 
> to us, since the SV-A Report in the DOE-2 Engine reports shows Outdoor Air in the 
> system results.
> 
> Any help to guide us on why the energy usage from Ventilation using Outdoor Air  
> is not showing up in the results / end usage analysis in our energy model would be 
> very appreciated.
> 
> Thanks & Best Wishes!
> Mark
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
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