[Bldg-sim] LEED - What does it take?

Joe Huang yjhuang at whiteboxtechnologies.com
Wed Jan 16 16:18:22 PST 2013
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Dennis,

Not to nitpick too much, but while SEER is a ratio, it is not unitless.  It's the cooling 
extraction rate in BTU/hr, divided by the electricity consumption in Watts.  COP is a 
truly unitless number, and is  smaller than the SEER by the ratio of 3.413, which is the 
conversion of BTU/hr to Watts.

Joe

Joe Huang
White Box Technologies, Inc.
346 Rheem Blvd., Suite 108D
Moraga CA 94556
yjhuang at whiteboxtechnologies.com
www.whiteboxtechnologies.com
(o) (925)388-0265
(c) (510)928-2683
"building energy simulations at your fingertips"


On 1/16/2013 2:25 PM, Dennis Knight wrote:
> Robert,
> SEER is a seasonal energy efficiency ratio and is unitless.  It is the "cooling output 
> during a typical cooling-season divided by the total electric energy input during the 
> same period": http://en.wikipedia.org/wiki/Seasonal_energy_efficiency_ratio.  A unit 
> with 10% or better seasonal cooling energy efficiency over a 13 SEER unit would have a 
> SEER rating of 14.3 or greater (1.1x13) if all other operating parameters were held 
> constant.  See link for definitions and other references.
> Dennis
>
> On Wed, Jan 16, 2013 at 5:11 PM, RobertWichert <robert at wichert.org 
> <mailto:robert at wichert.org>> wrote:
>
>     My current project has very good windows, "standard" walls, you're right about the
>     lighting, it's right on budget (but residential doesn't really have a budget, so the
>     small common areas are right on budget), better than standard roof.
>
>     I absolutely agree with you, Nick, on achieving 10% better, but all the trades point
>     to the others.  It's kind of comical, actually.
>
>     I guess my question on this list could be rephrased, using your approach, as "What
>     SEER is 10% better than SEER 13?"
>
>
>
>
>     Robert Wichert P.Eng. LEED AP BD&C
>     +1 916 966 9060 <tel:%2B1%20916%20966%209060>
>     FAX +1 916 966 9068 <tel:%2B1%20916%20966%209068>
>
>
>
>
>
>
>
>     ============================== =================
>
>     On 1/16/2013 12:34 PM, Nick Caton wrote:
>
>         A very simple way of looking at LEED & energy, which I come back to often for
>         discussions on that level, is to consider a building's performance like a tripod
>         with three important legs:  Lights, Mechanical, and Envelope.  If any of those
>         legs is too short, the tripod falls over.
>
>         Building on that analogy, to do 10% better than a LEED baseline, a good starting
>         place is to have at least:
>         -  10% better lighting (10% lower LPD),
>         -  10% better HVAC & hot water heating (10% better efficiencies), and
>         -  10% better envelope (10% more insulation in walls/roof, 10% better windows).
>         For each of these, you can source the baseline/prescriptive levels from the
>         standard of your choosing.
>
>         Overperforming in one area can sometimes make up for underperfomance in another,
>         but with diminishing returns.  Amazing HVAC equipment/design has a harder time
>         shining when you have a poor envelope and/or the lighting designer treats LPD's
>         as a "budget" they have to use up.  For such reasons, it's advisable to always
>         consider building performance in holistic fashion in early/broader discussions.
>
>         That's my (simple) take anyway!
>
>         ~Nick
>
>         NICK CATON, P.E.
>         SENIOR ENGINEER
>
>         Smith & Boucher Engineers
>         25501 west valley parkway, suite 200
>         olathe, ks 66061
>         direct 913.344.0036 <tel:913.344.0036>
>         fax 913.345.0617 <tel:913.345.0617>
>         www.smithboucher.com <http://www.smithboucher.com>
>
>
>         -----Original Message-----
>         From: bldg-sim-bounces at lists. onebuilding.org
>         <mailto:bldg-sim-bounces at lists.onebuilding.org> [mailto:bldg-sim-bounces@
>         lists.onebuilding.org <mailto:bldg-sim-bounces at lists.onebuilding.org>] On Behalf
>         Of RobertWichert
>         Sent: Wednesday, January 16, 2013 9:24 AM
>         To: EnergyPro at yahoogroups.com <mailto:EnergyPro at yahoogroups.com>;
>         bldg-sim at lists.onebuilding.org <mailto:bldg-sim at lists.onebuilding.org>
>         Subject: [Bldg-sim] LEED - What does it take?
>
>         I know that LEED is way more than just energy, and energy is way more than just
>         equipment, but just for a basis, what SEER and EER do people have to use to get
>         10% better than ASHRAE 90.1 to qualify for LEED?  I also know that you don't
>         have to use ASHRAE 90.1, but that is what I am doing.
>
>         So, what does it take?
>
>         My shot - Residential Apartment, individual DX units, 17 SEER and 13 EER in
>         California CZ 12 (Mostly cooling).
>
>            Next?
>
>
>         --
>         Robert Wichert P.Eng. LEED AP BD&C
>         +1 916 966 9060 <tel:%2B1%20916%20966%209060>
>         FAX +1 916 966 9068 <tel:%2B1%20916%20966%209068>
>
>
>
>
>
>
>
>         ============================== =================
>
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>
>
> -- 
> M. Dennis Knight, P.E.
> Founder & CEO
> *W*hole *B*uilding *S*ystems, LLC
> P.O. Box 1845
> Mt. Pleasant, SC 29465
> Phone: 843-437-3647
> Email: dknight at wholebuildingsystems.com <mailto:dknight at wholebuildingsystems.com>
> Website: www.wholebuildingsystems.com <http://www.wholebuildingsystems.com>
>
>
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