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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.<br>
<br>
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.<br>
<br>
On 11/14/13 12:30 PM, Simge Andolsun wrote:
<blockquote
cite="mid:CAHm8iRMFu5akDzM+aU62NVm_8inekxnAsR0Dr7EuiWHo5=8ZAw@mail.gmail.com"
type="cite">
<div dir="ltr">
<div>Dear eQuest users,</div>
<div> </div>
<div>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.</div>
<div> </div>
<div>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. </div>
<div> </div>
<div>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?</div>
<div> </div>
<div>Would you please help me with this question?</div>
<div>I'd appreciate it very much.</div>
<div> </div>
<div>Thanks,</div>
<div>Best Regards,</div>
<div>S. Andolsun, PhD</div>
</div>
<br>
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