[Equest-users] Energy Recovery

Simge Andolsun simgeandolsun at gmail.com
Thu Nov 14 16:15:36 PST 2013


I see. Thanks for this information. When I model the cooling season
separately in another file with economizer and without energy recovery,
then I am avoiding having to use these inefficient motors, which saves
energy. Can we say that modeling cooling season with no energy recovery is
a good idea then? Can you think of any problem that might arise with this
approach? Would you please let me know?

Thank you very much,
Best Regards,

Simge Andolsun, PhD.


On Thu, Nov 14, 2013 at 3:13 PM, Patrick J. O'Leary, Jr. <
poleary1969 at gmail.com> wrote:

>  a delta t of "0" will make it run all of the time.  i.e. erv supply fan
> motor, exhaust motor, and wheel motor.  and these motors aren't typically
> very efficient.
>
>
> On 11/14/13 1:36 PM, Simge Andolsun wrote:
>
>  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
>>
>>
>>  _______________________________________________
>> Equest-users mailing listhttp://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
>>
>>
>>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20131114/ce7ea518/attachment-0001.htm>


More information about the Equest-users mailing list