[Bldg-sim] LEED 2009 Modelling - Electric Vehicles and Rainwater Cisterns

Dahlstrom, Aaron ADahlstrom at in-posse.com
Wed Aug 10 07:06:01 PDT 2011

Aaron -

I agree with Kevin - my understanding is, if the load is served from the building meter and located within the LEED boundary, it should be included in the LEED model.

Both items would show up in the design and the baseline, as process energy consumers.

There is a tradeoff between water efficiency and energy efficiency that is made when a building decides to install its own water pressurization pumps. I'm not sure if your municipal water supply system has the controllability to reduce its water pressurization pumping energy based on your use of recovered water - but I haven't had the chance to work on those systems before, and I'm not sure how those systems are assembled.

If there are any efficiency measures on the rainwater pump that would be considered above "documented industry standard", you could look at documenting a reduction from the baseline via an Exceptional Calculation method.

That said, I imagine that the key thing for both loads would be determining a realistic schedule of use. You might find that the electric charging station in particular has a high peak power draw but a relatively low consumption, due to limited hours of use.

In line with Kevin's suggestion - if the electric vehicles are replacing fleet vehicles that would "traditionally" be sourced from another fuel, there may be an opportunity to claim a different baseline and show savings. But if they are just for visitors / employees, you might just use a baseline that is identical to your design.

Aaron Dahlstrom , PE, LEED(r) AP
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From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Kevin Kyte
Sent: Wednesday, August 10, 2011 8:28 AM
To: Aaron Smith; bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] LEED 2009 Modelling - Electric Vehicles and Rainwater Cisterns


I would think you would include these measures as an external load directly on the meter.  Each one individually is probably contributing to its own LEED point.  However, it does raise questions on how one could benchmark such measures.  For the electric vehicle charging stations, what if an on-site gas station was theorized as a base case?  Sounds like a lot of extra work, and what takes more energy to make, coal or gasoline?  Also, the rainwater pump is used for toilet rooms or for gardening?  Last I checked pumping energy to water flowers was not included, though I suppose it probably is not.


From: Aaron Smith [mailto:asmith at mreng.ca]<mailto:[mailto:asmith at mreng.ca]>
Sent: Tuesday, August 09, 2011 10:21 AM
To: bldg-sim at lists.onebuilding.org<mailto:bldg-sim at lists.onebuilding.org>
Subject: [Bldg-sim] LEED 2009 Modelling - Electric Vehicles and Rainwater Cisterns


I'm putting together a LEED 2009 Submission and the rules now state that "Both the baseline building model and the proposed model must cover all building energy components..." (pg. 286 of LEED Canada 2009).

I have no trouble including computer equipment, elevators and exterior lights but we also have a rainwater cistern pump and electric vehicle charging stations.  I'm not sure if the electric vehicles should be considered "building energy components".  As well, both technologies actually save energy elsewhere (gasoline/diesel and water utility pumping power) so I don't think we should be penalized in our % energy cost savings by adding these two energy uses to both reference model and proposed model.  Any thoughts on these?


Aaron Smith, P.Eng
LEED(r) AP BD+C, M-ASHRAE, Mechanical Engineer
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