[Equest-users] Setting DOAS system type airflow rates

Chris Hadlock cjhadlock at gmail.com
Thu May 16 11:17:04 PDT 2019 

Hi Nick,

It was with the custom hourly outputs specific for DOAS systems that I
noticed this behaviour. I have no dehumidification controls specified (and
no dehumidification reheat energy indicated from my hourly reports). My
DOAS fan is set to run 24/7. The hourly reports show a heating load (and
corresponding fuel consumption) all hours of the year, even during cooling
hours. Using the hourly outputs available, I am unable to find out the
source of this heating load...really not sure what to make of it.

Chris

On Thu, May 16, 2019 at 1:04 PM Nicholas Caton <Nicholas.Caton at se.com>
wrote:

> Ah sorry, I retract my guess – I read too fast and my eyes locked to
> Brian’s demonstrative screenshot, which had a hot water loop indicated for
> heating.
>
>
>
> Taking a step back, have you tried some of the custom hourly outputs
> specific for DOAS systems?  It may be helpful to figure out if this gas is
> being consumed 24/7, in sync with system operations, day vs. night, etc.
>
>
>
> One new thought is that this might be a piece of subcooling and reheat to
> accomplish dehumidification – something to look out for in those hourlies.
>
>
>
> ~Nick
>
>
>
> *Nick Caton, P.E., BEMP*
>
>   Senior Energy Engineer
>   Regional Energy Engineering Manager
>
>   Energy and Sustainability Services
>   Energy Performance Contracting
>
> D
> M
> F
> E
>
> 913 . 564 . 6361
>
> 785 . 410 . 3317
>
> 913 . 564 . 6380
>
> *nicholas.caton at se.com <nicholas.caton at se.com>*
>
> 15200 Santa Fe Trail Drive
> Suite 204
> Lenexa, KS 66219
> United States
>
>
>
>
>
> *From:* Equest-users <equest-users-bounces at lists.onebuilding.org> *On
> Behalf Of *Nicholas Caton via Equest-users
> *Sent:* Thursday, May 16, 2019 11:00 AM
> *To:* Chris Hadlock <cjhadlock at gmail.com>; 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
>
>
>
> A fast shotgun guess:  Is it possible the boiler(s) serving that hot water
> loop feature a 5:1 turndown and the loop operation is set to standby,
> meaning the boiler(s) can’t turn off completely?
>
>
>
> ~Nick
>
>
>
> *Nick Caton, P.E., BEMP*
>
>   Senior Energy Engineer
>   Regional Energy Engineering Manager
>
>   Energy and Sustainability Services
>   Energy Performance Contracting
>
> D
> M
> F
> E
>
> 913 . 564 . 6361
>
> 785 . 410 . 3317
>
> 913 . 564 . 6380
>
> *nicholas.caton at se.com <nicholas.caton at se.com>*
>
> 15200 Santa Fe Trail Drive
> Suite 204
> Lenexa, KS 66219
> United States
>
>
>
>
>
> *From:* Equest-users <equest-users-bounces at lists.onebuilding.org> *On
> Behalf Of *Chris Hadlock via Equest-users
> *Sent:* Thursday, May 16, 2019 9:16 AM
> *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
>
>
>
> 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
> <https://eur02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.pathfinder-ea.com%2F&data=02%7C01%7CNicholas.Caton%40se.com%7Cf8a85f5edc2c42cdb59508d6da17969f%7C6e51e1adc54b4b39b5980ffe9ae68fef%7C0%7C0%7C636936192180474764&sdata=ZxSS6IfOqstH6v3zU5dyJpYkPxBde709aBQo0vu81KU%3D&reserved=0>
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>
> *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
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