[Equest-users] HRV Modelling

[Patrick J. O'Leary, Jr.]

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>
>
>
>
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