[Equest-users] Setting DOAS system type airflow rates

Chris Hadlock cjhadlock at gmail.com
Thu May 16 07:15:51 PDT 2019 

For my most recent project for which I have a DOAS system, I've noticed a
constant (8760 hrs) heating energy consumption. I've got the DOAS set up as
a gas-fired furnace and DX cooling coil. I've set my auxiliary fuel
consumption set to 0 and no preheat. During the summer where there is
active cooling my furnace is running at about 19% of it's design capacity
(simultaneous heating and cooling). Has anyone noticed their DOAS system
doing this? Any suggestions?

Thanks,
Chris

On Wed, May 15, 2019 at 9:52 AM Brian Fountain via Equest-users <
equest-users at lists.onebuilding.org> wrote:

> Hi Chris.
>
>
>
> Yes – you can explicitly set the heating and/or cooling capacities of the
> DOAS system type.
>
>
>
>
>
> Cheers,
>
>
>
> Brian
>
>
>
>
>
> *Footprint *
> *Brian Fountain *Associate
> d 416 572 8501 m 416 562 6831
>
>
>
> *From:* Equest-users <equest-users-bounces at lists.onebuilding.org> *On
> Behalf Of *Jones, Christopher via Equest-users
> *Sent:* Wednesday, May 15, 2019 8:39 AM
> *To:* Bishop, Bill <bbishop at pathfinder-ea.com>
> *Cc:* equest-users at lists.onebuilding.org
> *Subject:* Re: [Equest-users] Setting DOAS system type airflow rates
>
>
>
> CAUTION: EXTERNAL SENDER
>
> Thanks Bill,
>
> Re. DOAS coils – is there an option to specifically size the coils?
>
>
>
> *Christopher R Jones, P.Eng.*
>
> T+ 1 416-644-0252
>
>
>
>
>
> *From:* Equest-users [mailto:equest-users-bounces at lists.onebuilding.org
> <equest-users-bounces at lists.onebuilding.org>] *On Behalf Of *Bishop, Bill
> via Equest-users
> *Sent:* Tuesday, May 14, 2019 2:02 PM
> *To:* Brian Fountain <Brian.Fountain at sa-footprint.com>
> *Cc:* equest-users at lists.onebuilding.org
> *Subject:* Re: [Equest-users] Setting DOAS system type airflow rates
>
>
>
> Thanks, Brian! You make an important point on design sizing of DOAS
> systems – the hourly ventilation rate is determined by the systems/zones
> that the DOAS serves, and the corresponding ventilation controls for those
> systems.
>
> Some additional observations:
>
> -          If you enter the DOAS SUPPLY-FLOW (Design cfm):
>
> o   The design fan power will be based on the SUPPLY-FLOW multiplied by
> SUPPLY-KW/FLOW (if entered).
>
> o   Any central airhandler coils will be autosized based on the
> SUPPLY-FLOW. (See the SV-C report in the SIM file.)
>
> -          If instead, you let the DOAS SUPPLY-FLOW (Design cfm) default
> by leaving it blank:
>
> o   The design fan power will be based on the design ventilation rate
> determined by the served systems multiplied by SUPPLY-KW/FLOW (if entered).
>
> o   Any central airhandler coils will be autosized based on the design
> ventilation rate.
>
> -          If you enter zone ventilation as OA/FLOW-PER (cfm per person),
> to simulate DCV or to size the ventilation per ASHRAE 62.1 guidelines, the
> design ventilation rate will be based on the highest hourly value in the
> occupancy schedule. So you have to have at least one hour with 1.0
> occupancy either in the weekday, weekend and/or CDD/HDD schedules.
> Otherwise, the design ventilation rate will be reduced.
>
>
>
> ~Bill
>
>
>
> *William Bishop, PE, BEMP, BEAP, CEM, LEED AP*
>
> *Senior Energy Engineer*
>
>
>
> [image: Pathfinder-EA-logo-2]*T: (585) 698-1956              *          F:
> (585) 325-6005
>
> bbishop at pathfinder-ea.com <wbishop at pathfinder-ea.com>
> www.pathfinder-ea.com
>
> 134 South Fitzhugh Street
>
> Rochester, NY 14608                       *Ask me why Carbon Fee &
> Dividend may be right for you.*
>
>
>
> *From:* Equest-users <equest-users-bounces at lists.onebuilding.org> *On
> Behalf Of *Brian Fountain via Equest-users
> *Sent:* Monday, May 13, 2019 5:47 PM
> *To:* equest-users at lists.onebuilding.org
> *Subject:* [Equest-users] Setting DOAS system type airflow rates
>
>
>
> Caution note when using DOAS systems – you cannot simply define the OA
> volume in the flow parameters tab of the DOAS fan.
>
>
>
> In DOE-2.3, there is now a system type ‘DOAS’ that will properly provide
> outdoor air either directly to zones or to the mixing section of the system
> it serves.  The volume of outdoor air delivered by this system is
> determined by the outdoor air flow rates of the zones that take air from
> this system.  The screenshot below suggests that the unit will be
> delivering 6,545 cfm of OA but in fact this system was only delivering 500
> cfm as the served zones did not have their OA volumes set properly.
>
>
>
>
>
> When the OA was defined in the zones taking air from this system, the
> volume of OA in the DOAS was as expected.
>
>
>
> Today’s lesson – define outdoor air rates properly, and hourly reports are
> your friend.
>
>
>
>
>
>
>
> *Footprint **Brian Fountain *P.Eng., LEED AP BD+C, BEMP
> Associate
> Brian.Fountain at sa-footprint.com
>
> 100 Sheppard Ave Suite 800 Toronto Ontario M2N 6Z1
> t 416 218 7025 f 416 487 9104  sa-footprint.com
>
> Vancouver  Calgary  Edmonton  Winnipeg  Kitchener  Toronto  Ottawa
>
>
>
>
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