[Equest-users] Setting DOAS system type airflow rates

Wed May 15 05:38:37 PDT 2019

Thanks Bill,
Re. DOAS coils - is there an option to specifically size the coils?

Christopher R Jones, P.Eng.
T+ 1 416-644-0252

[cid:image001.png at 01D50AF9.94BCE700]

From: Equest-users [mailto: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):
     *   The design fan power will be based on the SUPPLY-FLOW multiplied by SUPPLY-KW/FLOW (if entered).
     *   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:
     *   The design fan power will be based on the design ventilation rate determined by the served systems multiplied by SUPPLY-KW/FLOW (if entered).
     *   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

[Pathfinder-EA-logo-2]T: (585) 698-1956                        F: (585) 325-6005
bbishop at pathfinder-ea.com<mailto:wbishop at pathfinder-ea.com>        www.pathfinder-ea.com<http://www.pathfinder-ea.com/>
134 South Fitzhugh Street
Rochester, NY 14608               [cid:image006.png at 01D50AF9.94B6A570]         Ask me why Carbon Fee & Dividend may be right for you.

From: Equest-users <equest-users-bounces at lists.onebuilding.org<mailto: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<mailto: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.

[cid:image007.jpg at 01D50AF9.94B6A570]

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<mailto: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

________________________________

NOTICE: This communication and any attachments ("this message") may contain information which is privileged, confidential, proprietary or otherwise subject to restricted disclosure under applicable law. This message is for the sole use of the intended recipient(s). Any unauthorized use, disclosure, viewing, copying, alteration, dissemination or distribution of, or reliance on, this message is strictly prohibited. If you have received this message in error, or you are not an authorized or intended recipient, please notify the sender immediately by replying to this message, delete this message and all copies from your e-mail system and destroy any printed copies. You are receiving this communication because you are listed as a current WSP contact. Should you have any questions regarding WSP's electronic communications policy, please consult our Anti-Spam Commitment at www.wsp.com/casl<http://www.wsp.com/casl>. For any concern or if you believe you should not be receiving this message, please forward this message to caslcompliance at wsp.com<mailto:caslcompliance at wsp.com> so that we can promptly address your request. Note that not all messages sent by WSP qualify as commercial electronic messages.

AVIS : Ce message, incluant tout fichier l'accompagnant (< le message >), peut contenir des renseignements ou de l'information privil?gi?s, confidentiels, propri?taires ou ? divulgation restreinte en vertu de la loi. Ce message est destin? ? l'usage exclusif du/des destinataire(s) voulu(s). Toute utilisation non permise, divulgation, lecture, reproduction, modification, diffusion ou distribution est interdite. Si vous avez re?u ce message par erreur, ou que vous n'?tes pas un destinataire autoris? ou voulu, veuillez en aviser l'exp?diteur imm?diatement et d?truire le message et toute copie ?lectronique ou imprim?e. Vous recevez cette communication car vous faites partie des contacts de WSP. Si vous avez des questions concernant la politique de communications ?lectroniques de WSP, veuillez consulter notre Engagement anti-pourriel au www.wsp.com/lcap<http://www.wsp.com/lcap>. Pour toute question ou si vous croyez que vous ne devriez pas recevoir ce message, pri?re de le transf?rer au conformitelcap at wsp.com<mailto:conformitelcap at wsp.com> afin que nous puissions rapidement traiter votre demande. Notez que ce ne sont pas tous les messages transmis par WSP qui constituent des messages electroniques commerciaux.

-LAEmHhHzdJzBlTWfa4Hgs7pbKl
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20190515/16539cfb/attachment-0001.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image004.jpg
Type: image/jpeg
Size: 9336 bytes
Desc: image004.jpg
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20190515/16539cfb/attachment-0009.jpg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image006.png
Type: image/png
Size: 1554 bytes
Desc: image006.png
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20190515/16539cfb/attachment-0006.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image007.jpg
Type: image/jpeg
Size: 31943 bytes
Desc: image007.jpg
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20190515/16539cfb/attachment-0010.jpg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.png
Type: image/png
Size: 1860 bytes
Desc: image001.png
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20190515/16539cfb/attachment-0007.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image003.jpg
Type: image/jpeg
Size: 1882 bytes
Desc: image003.jpg
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20190515/16539cfb/attachment-0011.jpg>