[Equest-users] Equest - adding Heat Recovery to VAVS system

[Nick Caton]

Hi Ginnie,

I believe this needs to be an ON/OFF schedule.

Also take note of this help entry snippet:
ERV-SCHEDULE specifies that the ERV has its own operating schedule. Note that this schedule can lock out the ERV when it would otherwise be running, but cannot force the ERV to run when the HVAC fans are off.

Choosing "when minimum-OA" means the program won't use any schedule you've defined, you'll need to select the scheduling option in the same dropdown, then select your custom schedule.

Finally, be sure to take note of Bill's reply/advice (attached):  Selecting "when minimum-OA," while not defining an economizer function (fixed fraction), means in net effect you are telling the heat recovery to operate at all hours the system fans are running.  This can definitely be counter-productive, adding building heat into your airstream when you don't want to, increasing cooling energies, and so forth.

Regards,

~Nick
[cid:489575314 at 22072009-0ABB]

NICK CATON, P.E.
SENIOR ENGINEER

Smith & Boucher Engineers
25501 west valley parkway, suite 200
olathe, ks 66061
direct 913.344.0036
fax 913.345.0617
www.smithboucher.com

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Ginnie Schofield
Sent: Thursday, June 06, 2013 12:30 PM
To: Bruce Easterbrook
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Equest - adding Heat Recovery to VAVS system

Bruce & Users:
Since an ERV/HRV schedule was not created with system, I tried to create one.  That didn't work out so well for me.  I believe my results are being calculated on 24/7 operation and NOT bypassed or off when running.   Getting a proper operation schedule should help with the additional cooling shown on simulation reports.   Any ideas or methods to create a schedule that will work?

Again, thank you all in advance.


GINNIE SCHOFIELD
MECHANICAL ENGINEER
gschofield at edaengineering.com<mailto:gschofield at edaengineering.com>



From: Bruce Easterbrook [mailto:bruce5 at bellnet.ca]
Sent: Wednesday, June 05, 2013 10:47 AM
To: Ginnie Schofield
Cc: equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: Re: [Equest-users] Equest - adding Heat Recovery to VAVS system

Hi Ginnie,
IAQ costs money and bringing in fresh outside air to improve it is the solution.  Heat recovery depending on your climate doesn't always save money but typically if you have hot humid summers or cold winters it will.  I would first take a look at your ERV/HRV schedule to make sure it isn't running 24/7.  You should also check it's relationship with the economizers.  It should be off and bypassed when they are running.  You only need fresh air for people when they are there occupying the building.
Bruce Easterbrook P.Eng.
Abode Engineering
On 05/06/2013 11:22 AM, Ginnie Schofield wrote:
Equest Users:

In my school model, I have added the Heat Recovery option to my VAVS system in the current model, and it throws results clear out of line, increasing electric power usage almost 3 times, with increased  ventilation fan operation and space cooling year round, which shouldn't be necessary in Wyoming.

Looking for methods to modify input and correct these obviously errant results.  There has been some discussion here earlier this week, tried a couple of the suggestions, without acceptable results.  If adding another system to handle the heat recovery or adding smaller heat recover to each zone is the right answer, please share the method for creating the new system in detailed edit mode.

Thank you in advance for your time and suggestions.


GINNIE SCHOFIELD
ENGINEERING DESIGN ASSOCIATES
(Ph) 307-266-5033   (Fx) 307-234-3805






_______________________________________________

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<mailto:EQUEST-USERS-UNSUBSCRIBE at ONEBUILDING.ORG>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20130607/16c74d15/attachment-0002.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.jpg
Type: image/jpeg
Size: 1459 bytes
Desc: image001.jpg
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20130607/16c74d15/attachment-0002.jpg>
-------------- next part --------------
An embedded message was scrubbed...
From: "Bishop, Bill" <bbishop at pathfinder-ea.com>
Subject: Re: [Equest-users] Equest - adding Heat Recovery to VAVS system
Date: Wed, 5 Jun 2013 16:51:46 +0000
Size: 29225
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20130607/16c74d15/attachment-0002.eml>