[Equest-users] Heat Recovery

[Robby Oylear]

To piggy back onto this discussion, I've been having trouble with a heat
recovery system that's increasing the cooling energy of my system.  I can
understand that under certain control schemes, this might actually be the
case, but even when I set the control method to OA-DT and select that the
ERV will only run during heating operation, the end result is still an
increase in cooling.

Does anyone have any insight into what could be causing this?

Thanks,

*Robby Oylear, LEED**®** AP BD+C*

*Mechanical Project Engineer*

*Energy Analyst*

* *

*D* 206-788-4571 | *C* 206-354-2721

*www.rushingco.com* <http://www.rushingco.com/>

On Mon, Aug 1, 2011 at 6:13 AM, Bishop, Bill <wbishop at pathfinder-ea.com>wrote:

> Bill,
>
> There should always be at least a slight increase in fan energy when you
> add heat recovery to a system, leaving everything else equal (duct size,
> cabinet size, airflow rate etc.). By default, eQUEST adds either 1.5" or
> 1.0" static pressure (depending on the ERV device type you select) to
> both the make-up and exhaust air streams. The extra static is added to
> the system supply and return fans, unless you create separate
> "self-contained" ERV-FANS under the system Outdoor Air -> Heat Recovery
> 2 tab. If you don't have separate fans in the ERV/HRV, and you know what
> the total static pressure of the system is with heat recovery included,
> you can enter the system SUPPLY-STATIC under Fans -> Fan Power and
> Control, and zero out the ERV-OA-STATIC and ERV-EXH-STATIC.
>
> If the heat recovery system is not designed yet and you are running
> what-if scenarios, try different control strategies under system Outdoor
> Air -> Heat Recovery 1, ERV-RUN-CTRL and ERV-RECOVER-MODE. Optimizing
> the control strategy will help you find the best balance between fan
> energy penalty, cooling energy savings/penalty and heating energy
> savings.
>
> Regards,
> Bill
>
>
> -----Original Message-----
> From: equest-users-bounces at lists.onebuilding.org
> [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Bill
> Lafley
> Sent: Saturday, July 30, 2011 1:34 PM
> To: equest-users at lists.onebuilding.org
> Subject: [Equest-users] Heat Recovery
>
> Hello,
>
> When I add heat recovery to my proposed model the natural gas usage
> drops significantly but the vent fan electrical usage skyrockets to
> almost 6 times the base vent fan usage without heat recovery.  I
> searched the archives and tried adjusting down the in W.G. but it does
> not seem to reduce it.  Is there something else I should be looking at?
>
> Thanks,
>
> <http://www.cetonline.org>
>
> Bill Lafley <mailto:blafley at cetonline.org> | Energy Analyst
> Center for EcoTechnology
> <http://www.cetonline.org>
> <http://www.cetonline.org/Mailist/VR_Signup.php>
>
>
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