[Equest-users] PSZ Dehumidification reheat?

[Michael Campbell via Equest-users]

Thanks for the input Bill.  This is actually very similar to how I have my
system set up right now.  My issue is that if I have ZONE-HEAT-SOURCE as
electric with 18F DT I will get the same exact results as if I have
ZONE-HEAT-SOURCE as "Not Installed."  My PSZ DOAS is only attached to my
dummy space... could this be why?

On Mon, Apr 25, 2016 at 5:23 PM, Bishop, Bill <bbishop at pathfinder-ea.com>
wrote:

> Hi Mike,
>
> With a PSZ, your ZONE-HEAT-SOURCE will only get applied at your subzones
> (non-control zone(s)). The heat pump will operate to satisfy both the
> control zone thermostat and the humidity requirement based on the RH of the
> return air. For a DOAS heat pump PSZ serving multiple zones, the supply air
> temperature at the control zone will vary considerably on a sub-hourly
> basis as the heat pump cycles between cooling and heating mode to prevent
> overcooling the zone, but reheat can be used to keep the SAT to the
> subzones relatively constant. Give this input a try to get you close to
> your description:
>
> *"DOAS me no questions" = SYSTEM          *
>
> *   TYPE             = PSZ*
>
> *   HEAT-SOURCE      = HEAT-PUMP*
>
> *   ZONE-HEAT-SOURCE = ELECTRIC*
>
> *   MAX-SUPPLY-T     = 73*
>
> *   MIN-SUPPLY-T     = 55*
>
> *   MAX-HUMIDITY     = 60*
>
> *   REHEAT-DELTA-T   = 18*
>
>
>
> Regards,
>
> ~Bill
>
>
>
> *William Bishop, PE, BEMP, BEAP, CEM, LEED AP **|** Pathfinder Engineers
> & Architects LLP*
>
> *Senior Energy Engineer*
>
>
>
>
>
> 134 South Fitzhugh Street                 Rochester, NY 14608
>
> *T: (585) 698-1956 <%28585%29%20698-1956>*                        F: (585)
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>
> bbishop at pathfinder-ea.com <wbishop at pathfinder-ea.com>
> www.pathfinder-ea.com
>
> [image: http://png-5.findicons.com/files/icons/977/rrze/720/globe.png]Carbon
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>
> *From:* Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] *On
> Behalf Of *Michael Campbell via Equest-users
> *Sent:* Monday, April 25, 2016 9:17 AM
> *To:* equest-users at lists.onebuilding.org
> *Subject:* [Equest-users] PSZ Dehumidification reheat?
>
>
>
> Hello,
>
> Hoping someone can help me out here.  I am modeling a PSZ heat pump with
> ERV as a DOAS.  It is supposed to dehumidify to keep RH below 60%.  It
> appears to be doing this currently based on the hourly reports.  However, I
> need to also model an electric resistance coil that will reheat the
> dehumidified air back up to 73F.  Does anyone know how I can accomplish
> this with PSZ?  I've tried making "ZONE-HEAT-SOURCE" electric resistance,
> but this does not seem to have any effect at all.  I also thought about
> applying preheat to the zones served by the DOAS but  it states in the item
> description that preheat is appled to the mixed air flow, not just outside
> air so that won't work for me.  Any recommendations?
>
> Thank you,
>
> Mike C
>
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