[Equest-users] Modelling losses in chillers

Jones, Christopher Christopher.r.Jones at wsp.com
Thu Aug 9 07:05:03 PDT 2018


For example, if you are using the default chiller water efficiency of 4.4 COP. You need to reduce that efficiency by 5% to account for piping loses. DES cooling eff.: 4.4 * 0.95 = 4.18 COP.

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

[cid:image002.png at 01D42FC8.6F990150]

From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of equest user via Equest-users
Sent: Thursday, August 09, 2018 5:56 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Modelling losses in chillers

Hola Modelers,

Its time that I need some help!!

My building includes chilled water district cooling system in which I have received a review comment which is as follows:

“If following Option 2 of the district thermal guidelines the Proposed model must reflect a virtual plant with the same average efficiencies of the entire upstream district energy system based on actual loading (average efficiencies can be determined using either the Monitoring or Modeling methods described in Appendix C). Alternatively, the default plant efficiency values outlined in Section 2.4.1.2.3 of the guidelines (4.4 COP for DES cooling plant and 70% for DES heating plant) may be may be used to reflect the district energy plants in the Proposed model. In addition, thermal distribution losses must be accounted for in the Proposed model based on the losses determined in the actual design or the default values outlined in Section 2.4.1.2.3 of the guidelines may be used (5% for chilled water district cooling, 10% for hot water district heating, 15% for closed steam loop, or 25% for open steam loop)”

Can anyone help me on how should I account 5 % losses mentioned in the comment (highlighted in red)??

Waiting for the reply.

Thanks
Vishal

________________________________


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.



-LAEmHhHzdJzBlTWfa4Hgs7pbKl
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20180809/744662f7/attachment-0002.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image002.png
Type: image/png
Size: 1860 bytes
Desc: image002.png
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20180809/744662f7/attachment-0004.png>


More information about the Equest-users mailing list