[Equest-users] Modeling ERV's in Equest

[Charles Land]

What is the climate like?  If you have a lot of cooling hours where the outside air temperature is lower than the space temperature it will hurt your cooling.  For example, if it is 60 outside and your building is calling for cooling.  With a 74 degree space temperature, if your running your ERV your actually raising the outside air temp to lets say 65 then cooling it back down.  One way to help this out is to set your ERV to run "when minimum outside air" rather than "when fans on".  This will allow the unit to economize.  You can then continue to play with the controls until you get the best savings out of it.  If the units cant economize you can also set the ERV to run based on outside air  delta t's or delta h's.  You can also set the ERV to put off a particular temperature, such as 55. I believe you can set both a cooling and a heating temp.   You will then have to choose the method of either bypassing air or modulating the wheel speed to give you your specified leaving air temperature.
Hope this helps.

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Walson, Kristy
Sent: Thursday, January 07, 2010 8:15 AM
To: 'equest-users at lists.onebuilding.org'
Subject: [Equest-users] Modeling ERV's in Equest

Hi all,

We are using Equest to model a 500,000 sq ft federal prison facility.  More than half of the AHU's have energy recovery, so we modeled this at each applicable unit.  When we run the model with ERV's vs. the model with no ERV's, it appears as though the ERV's are actually hurting us on the cooling energy.  Is there a quirk when modeling ERV's in Equest (much like the bug fix in the Advanced Edit section of VisDOE)?  Does anyone have any suggestions, or has anyone run into a similar problem before?

Thanks in advance for the advice...

P.S. Kim - are you happy I'm finally asking a question about Equest??  :)


Kristy M. Walson, PE, LEED AP
Mechanical Engineer / Sustainable Design

TLC Engineering for Architecture
Your Architecture 2030 Partner

255 South Orange Avenue, Suite 1600
Orlando, FL 32801-3463

phone:

407-841-9050

fax:

407-425-7367

direct:

407-487-1118

website:

www.tlc-engineers.com<http://www.tlc-engineers.com>


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