[Bldg-sim] Outdoor ice rink modeling

Matt Steen msteen at ambient-e.com
Wed Jun 20 15:29:35 PDT 2018

Hi Christopher,

I just did this in OpenStudio/EnergyPlus, albeit not explicitly because EnergyPlus isn’t currently able to model a PlantLoop using refrigerant as the working fluid.

Here’s a summary of the system I modeled for an outdoor ~16k ft2 ice rink at a city park in Indiana.

(1) Flooded Chiller (refrigerant/brine)
(3) Compressors
(1) Evaporative Condenser (refrigerant/water)
(1) Condenser Pump
(1) Condenser Fan
(3) Brine Pumps

Here’s the methodology I used, which I plan to use to claim savings for LEED through an exceptional calculation.

 1.  Have the design engineer calculate the hourly cooling load on the plant using the weather data from the TMY file.

[cid:image003.png at 01D408B3.DB75B6C0]

 1.  Adjust the cooling load profile to remove loads during the months when the ice rink is not expected to typically operate (Mar – Nov).

[cid:image005.png at 01D408B3.DB75B6C0]

 1.  Calculate the gross COP of the plant by dividing the total cooling capacity (W) by the total HP (W) of the compressors, pumps, and fans.

 1.  Calculate the hourly electrical load of the plant by dividing the hourly cooling load (W) by the COP (W/W).

 1.  Determine the peak electrical load of the plant (W).

 1.  Calculate the hourly peak electrical load fraction by dividing the electrical load for each hour of the year by the peak electrical load, which results in a constant (greater than zero) operating schedule during the ice rink season.

[cid:image006.png at 01D408B3.DB75B6C0]

 1.  Adjust the peak electrical load fraction profile to account for the system cycling/staging on/off by setting fractions below 25% to zero. This was my main assumption based on the number of compressors, so adjust to fit your project.

[cid:image012.png at 01D408B3.DB75B6C0]

 1.  I used a Ruby script to add the annual hourly schedule as a ScheduleFixedInterval object to my model using the OpenStudio API (example<https://unmethours.com/question/14348/can-you-load-schedulefile-in-openstudio/>).

 1.  The ice rink system was modeled using the EnergyPlus object Exterior:FuelEquipment<https://bigladdersoftware.com/epx/docs/8-9/input-output-reference/group-exterior-energy-use-equipment.html#exteriorfuelequipment> with the Design Level field set to the peak electrical load in (W) and the peak electrical load fraction profile as the Schedule. For each hour of the year, the peak load value is multiplied by the peak load fraction to determine the energy use (Wh) during the simulation. I used an OpenStudio measure to add this object to the model during the simulation.

Hope that helps.

Matt Steen
Building Performance Engineer
ambient energy
1449 7th Street, Suite 440 | Denver, CO 80204
303.278.1532 x 215 | msteen at ambient-e.com<mailto:msteen at ambient-e.com>
Denver • San Francisco
Learn about our new office on MSU Denver's website here<https://insider.msudenver.edu/rising-star-aes-building-shines-with-prestigious-honor>.
[cid:home1_41d5b6f9-7fe1-45fa-a1d1-214a3435d975.png]<http://ambient-e.com/>  [cid:006184-linkedin-16_242073c4-3270-4322-9929-8de986e69919.png] <https://www.linkedin.com/company/ambient-energy/>   [cid:006184-facebook-16_3bdd30f1-16ec-4cb2-9690-d706842d9f43.png] <https://www.facebook.com/Ambient-Energy-102037989630/>

From: Jones, Christopher <Christopher.r.Jones at wsp.com>
Sent: Wednesday, June 20, 2018 1:35 PM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] Outdoor ice rink modeling

Hello Simulistas,
I am working on a large community centre – swimming pools, indoor ice arenas, multi-purpose rooms, library, admin offices plus an outdoor ice rink cooled by the ice plant. I have experience modeling indoor ice rinks but not outdoor. Any ideas?

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

[cid:image001.png at 01D408A1.DE8FCD30]


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 privilégiés, confidentiels, propriétaires ou à divulgation restreinte en vertu de la loi. Ce message est destiné à 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 reçu ce message par erreur, ou que vous n'êtes pas un destinataire autorisé ou voulu, veuillez en aviser l'expéditeur immédiatement et détruire le message et toute copie électronique ou imprimée. Vous recevez cette communication car vous faites partie des contacts de WSP. Si vous avez des questions concernant la politique de communications électroniques 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, prière de le transférer 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.

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/bldg-sim-onebuilding.org/attachments/20180620/11ed69ea/attachment-0002.html>
-------------- 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/bldg-sim-onebuilding.org/attachments/20180620/11ed69ea/attachment-0016.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image003.png
Type: image/png
Size: 13302 bytes
Desc: image003.png
URL: <http://lists.onebuilding.org/pipermail/bldg-sim-onebuilding.org/attachments/20180620/11ed69ea/attachment-0017.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image005.png
Type: image/png
Size: 7072 bytes
Desc: image005.png
URL: <http://lists.onebuilding.org/pipermail/bldg-sim-onebuilding.org/attachments/20180620/11ed69ea/attachment-0018.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image006.png
Type: image/png
Size: 8147 bytes
Desc: image006.png
URL: <http://lists.onebuilding.org/pipermail/bldg-sim-onebuilding.org/attachments/20180620/11ed69ea/attachment-0019.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image012.png
Type: image/png
Size: 8292 bytes
Desc: image012.png
URL: <http://lists.onebuilding.org/pipermail/bldg-sim-onebuilding.org/attachments/20180620/11ed69ea/attachment-0020.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: home1_41d5b6f9-7fe1-45fa-a1d1-214a3435d975.png
Type: image/png
Size: 404 bytes
Desc: home1_41d5b6f9-7fe1-45fa-a1d1-214a3435d975.png
URL: <http://lists.onebuilding.org/pipermail/bldg-sim-onebuilding.org/attachments/20180620/11ed69ea/attachment-0021.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: 006184-linkedin-16_242073c4-3270-4322-9929-8de986e69919.png
Type: image/png
Size: 318 bytes
Desc: 006184-linkedin-16_242073c4-3270-4322-9929-8de986e69919.png
URL: <http://lists.onebuilding.org/pipermail/bldg-sim-onebuilding.org/attachments/20180620/11ed69ea/attachment-0022.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: 006184-facebook-16_3bdd30f1-16ec-4cb2-9690-d706842d9f43.png
Type: image/png
Size: 260 bytes
Desc: 006184-facebook-16_3bdd30f1-16ec-4cb2-9690-d706842d9f43.png
URL: <http://lists.onebuilding.org/pipermail/bldg-sim-onebuilding.org/attachments/20180620/11ed69ea/attachment-0023.png>

More information about the Bldg-sim mailing list