[Equest-users] HRV Modelling

[Samantha MacHardy]

I changed the Make-up air temperature control to "Mixed Air Reset" and this solved the problems I had with Cooling and Fans. I took your advice with changing the control type and Delta T but the best I can do is reduce it to be 93% better than reference instead of 97%. I've tried fiddling with different options and am still having way too much heat being produced.

From: Patrick J. O'Leary, Jr. [mailto:poleary1969 at gmail.com]
Sent: Thursday, June 07, 2012 2:55 PM
To: Samantha MacHardy
Cc: 'equest-users at lists.onebuilding.org'
Subject: Re: [Equest-users] HRV Modelling

hrv/erv savings are all about controls.  the default setting is on when system fans are on.  this can easily cost you more money & energy than not having the erv at all.

if the project is not designed for the hrv to operate on a delta t between the exhaust air & outside air this isn't really obvious.  i suggest changing the control type to delta t & try a few different amounts.  10 d f, 15 d f, 20 d f & see what the results are.  these can also be set up with an eem so you don't have to keep changing the main system & seeing what the results are.

look in the march 2012 ashrae journal.  there's an article explaining how to control a total energy wheel & the 2nd paragraph or so actually says an uncontrolled erv can result in more energy & more cost.  though you only have an hrv the concepts in the article will still apply for heating mode of course.

On 6/7/12 9:16 AM, Samantha MacHardy wrote:
Hello!

I'm working on modeling a Student Learning Centre and am having a bit of trouble with modeling an HRV. I go to the Air-Side HVAC and edit the Heat Recovery to say:

Device Installed - Yes
Device Type: Sensible HX
Effectiveness: 0.7

with everything else left as defaults to each of my systems. In my end results, my Domestic Hot Water and Space Heating are over 97% better, and my cooling is 50% worse than the reference. These numbers aren't making sense but I can't find much help anywhere with HRV in EQuest. Any help you could provide would be great!

Thanks!

Samantha MacHardy, B. Arch. Sci.
Energy Analyst
Provident Energy Management Inc.
T: 416-736-0630 x 2983 | smachardy at pemi.com<mailto:smachardy at pemi.com>





_______________________________________________

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/20120607/b881faa5/attachment-0001.htm>