[Equest-users] Energy Recovery

[Simge Andolsun]

Dear Patrick,

Thanks for your response. I actually had set my schedule to OA Exhaust DT
when get these results. The delta T I used was "0" so that the system would
benefit from every bit of temperature difference.

Thanks,
Best Regards,
S. Andolsun


On Thu, Nov 14, 2013 at 2:32 PM, Patrick J. O'Leary, Jr. <
poleary1969 at gmail.com> wrote:

>  how are you controlling the erv/energy recovery?  the default is for it
> to run when the supply fan runs.  this will cost you more in energy than it
> saves.  set the control method based on a delta T between the exhaust air
> and the outside air you'll see the savings in cooling mode.  in my climate
> zone (2b/southern arizona) the best delta t i found is 27 d f.
>
> once you set up the erv to run based on a delta t you can set up some
> parametric runs (set up one & then copy & rename it in the .inp file to
> save time) to try different delta t values without having to change each
> hvac unit every time you want to try a different delta t.
>
>
> On 11/14/13 12:30 PM, Simge Andolsun wrote:
>
>  Dear eQuest users,
>
> In my models, I realized that using energy recovery in the cooling season
> always gives higher cooling energy consumption results than turning off the
> energy recovery and using economizer only instead. I tried using OA
> Heat/Cool with Bypass OA or Bypass Exhaust thinking that such configuration
> would capture the best benefit of energy recovery and let the
> outside/exhaust air bypass when economizer is more beneficial. Then, I read
> in the eQuest manuals that this configuration still lets the energy
> recovery run when it is not beneficial in warm months and just opens up the
> economizer dampers to compensate for the unnecessary heating of the outside
> air. So, the loss caused by the energy recovery eats up the benefit that is
> provided with the economizer.
>
> Thus, I thought, may be, I should use two separate files to maximize the
> benefit from both the economizer and the energy recovery. The first file
> would be for heating (with OA Heating) where the energy recovery would be
> on whenever it can heat the outside air. Then the second file would be for
> cooling where there would be no energy recovery but the economizer would
> be available whenever the outside air is favorable for cooling. Finally, I
> would get heating energy consumption from the heating file and the cooling
> energy consumption from the cooling file.
>
> The only thing that stops me from following this approach is that I am
> wondering whether there was a logical reason why bypass configurations of
> eQuest give higher cooling energy consumption than the economizer only
> case. Shouldn't they be giving exactly the same cooling energy consumption?
> Is it because part of the outside/exhaust air is being bypassed in the
> bypass configurations instead of fully? or may it be because it is known
> that setting the energy recovery and economizer for the best benefit is
> pretty hard in reality and that's why it was assumed that it would not
> function ideally? Or, is there a completely different reason that I do not
> know?
>
> Would you please help me with this question?
> I'd appreciate it very much.
>
> Thanks,
> Best Regards,
> S. Andolsun, PhD
>
>
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