[Bldg-sim] LEED - What does it take?
Joe Huang
yjhuang at whiteboxtechnologies.com
Wed Jan 16 16:18:22 PST 2013
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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