[Equest-users] Modeling District Energy Systems for LEED
rajendra
rajendra at kalpakrit.com
Mon Jan 6 22:19:47 PST 2014
Hi Omar,
For estimating proposed buildings cooling/heating efficiencies you can
follow any of two method's mentioned below-
1. You can use default heating cooling efficiencies as per USGBC DES
modelling document.
2. You have to calculate manually heating and cooling efficiencies of
whole plant( Including Cooling tower , pumps, chillers etc.) at part
load i.e DES system capacity.
I would suggest that modelling of whole system is not required when DES
option is availed.
Thanks & Regards
Rajendra Choudhary
Sr.Energy Analyst
e: rajendra at kalpakrit.com
On 1/6/2014 10:12 PM, Scott Parker wrote:
>
> Omar,
>
> For the "modeling" option you will need to model the plant with the
> assumed full load (which includes more than just the one building).
> In a separate energy mode: Run an energy model with load from all
> buildings on it, and then use the average efficiency (e.g. kW/ton,
> COP, etc) in the building model as a constant efficiency for the whole
> year.
>
> For example, from the plant model you may come up with a COP = 5.1 as
> an _annual average_. Then the building model would use COP = 5.1 as a
> _constant value_.
>
> I'll leave it up to you to determine the best way to model the full
> load on the DES plant, but this could be estimated with a relatively
> simple model. The modeling software Trace has a specific feature for
> this, but you can manually do this in eQuest with a little work.
>
> Regards,
>
> Scott
>
> *From:* equest-users-bounces at lists.onebuilding.org
> [mailto:equest-users-bounces at lists.onebuilding.org] *On Behalf Of
> *Omar Katanani
> *Sent:* Monday, January 06, 2014 11:30 AM
> *To:* equest-users at lists.onebuilding.org
> *Subject:* [Equest-users] Modeling District Energy Systems for LEED
>
> Dear Sirs,
>
> I am modeling a school building for LEED which has a Campus Energy
> System (water cooled chiller and diesel boiler). The DES was installed
> almost 8 months ago for the first phase of the project.
>
> Now, I am modeling for the project's second phase, and additional
> chillers / boilers will be added to the DES in order to be able to
> serve both phases in addition to any potential building on campus in
> the future.
>
> 1)Looking at the USGBC's guidance for DES (Appendix C): in order to
> determine the proposed building heating / cooling efficiency, I guess
> I have to go with the "Modeling" option because the DES will be
> expanded as part of my project (so it's not existing).
>
> For this option, do I have to create a separate model of the district
> plant, or shall I add this district plant to my project's model?
> Appendix C says "Apply measured or estimated load profiles as "process
> loads" to reflect the estimated total loads on the plant". If this is
> the case, then if I add the process loads in addition to my project's
> loads, I will be double counting the loads, right?
>
> Does this mean I have to create a dummy project building (with no
> loads) with the proposed district plant to determine the efficiencies?
>
> 2)Does anyone have additional guidance for modeling district energy
> systems, other than the one of the USGBC? Something with more examples
> or maybe a case study with actual numbers?
>
> Best regards,
>
> Omar
>
> ___________________________
>
> Omar Katanani
> Senior Sustainability Engineer
>
> Email: omar at ecoconsulting.net <mailto:omar at ecoconsulting.net>
>
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