[Equest-users] Ventilation Energy

[Dave Weigel]

Thank you all --

Dan, that's a great idea. I'll share the enthalpy calculation when I get it 
smoothed out.

Best to you,

Dave

-----Original Message----- 
From: Daniel Knapp
Sent: Thursday, September 12, 2013 10:53 AM
To: Sami, Vikram
Cc: Pasha Korber-Gonzalez ; The Watt Doctors - Dave Weigel ; eQuest Users
Subject: Re: [Equest-users] Ventilation Energy

This is something I've been trying to figure out myself and I think there is 
a direct way to do. I haven't tried this, but one ought to be able to 
calculate the hourly load due to OA at the system level by printing out 
hourly reports of the supply air temperature and humidity, the return air 
temperature and humidity, the outdoor air temperature and humidity and the 
outdoor air fraction, the heating coil load and the cooling coil load. From 
these values, the enthalpy of the three air streams can be calculated and 
the hourly load due to OA on the coils can be calculated. It might be a 
little tricky to sort out the psychometrics, but it should be doable.

Cheers,
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 2013-09-11, at 5:07 PM, "Sami, Vikram" <vikram.sami at zgf.com> wrote:

> I don’t think there is a direct way to do this. Could you just run it with 
> zero outside air and see the difference?
>
> Another way I guess would be to subtract the space loads from the system 
> loads – which would in theory get you the ventilation loads. This won’t 
> actually tell you how much energy is being used to meet that load though. 
> Much simpler to zero out the OA.
>
> Vikram Sami
> Associate Partner
>
> ZGF ARCHITECTS LLP
> T 206.521.3509 E vikram.sami at zgf.com
> 925 Fourth Avenue, Suite 2400
> Seattle, WA 98104
>
> From: equest-users-bounces at lists.onebuilding.org 
> [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Pasha 
> Korber-Gonzalez
> Sent: Wednesday, September 11, 2013 1:28 PM
> To: The Watt Doctors - Dave Weigel
> Cc: eQuest Users
> Subject: Re: [Equest-users] Ventilation Energy
>
> Hi Dave,   I use the quick and dirty way for peak vent loads from the SV-A 
> report using the multiplier of the supply cfm and the OA% values at the 
> top of the report.  You can also compare the peak Vent CFM at the zone 
> level at the bottom of the report where they show the OA CFM for each 
> zone.
>
> Does anybody else use hourly reports to compile the Ventilation data?
>
> Pasha
> www.korberenergyconsultants.com
>
>
>
> On Wed, Sep 11, 2013 at 1:21 PM, The Watt Doctors - Dave Weigel 
> <Dave.Weigel at thewattdoctors.com> wrote:
> Hi eQuest Group,
>
> I was wondering if there is a quick way to determine how much of the 
> projected energy use in a building is due to conditioning of ventilation 
> air?  I have scoured through the eQuest reports and detailed simulation 
> output but no luck (unless I’m missing something). I suppose I can run the 
> simulation again with ventilation set to zero, but it would be great if it 
> could be drawn straight from the simulation output.
>
> Thanks!
>
> Dave
>
>
> David R. Weigel, PE
> Managing Member
> 1189 Golden Circle SW,  Lilburn GA 30047
> 678-353-6394 office       901-619-1716 cell
>
>
> _______________________________________________
> Equest-users mailing list
> http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org
> To unsubscribe from this mailing list send  a blank message to 
> EQUEST-USERS-UNSUBSCRIBE at ONEBUILDING.ORG
>
>
>
> The contents of this email and any attachments to it contain confidential 
> and/or legally privileged information from Zimmer Gunsul Frasca Architects 
> LLP or its affiliates. If you are not the intended recipient, or an 
> employee or agent responsible for delivering this message to the intended 
> recipient, be aware that any disclosure, copying, distribution, or use of 
> the information contained herein is strictly prohibited. If you received 
> this transmission in error, please contact the sender and destroy the 
> material in its entirety, whether in electronic or hard copy format.
> _______________________________________________
> Equest-users mailing list
> http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org
> To unsubscribe from this mailing list send  a blank message to 
> EQUEST-USERS-UNSUBSCRIBE at ONEBUILDING.ORG