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

[Dennis Knight]

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> 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
> FAX +1 916 966 9068
>
>
>
>
>
>
>
> ==============================**=================
>
> 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
>> fax 913.345.0617
>> www.smithboucher.com
>>
>>
>> -----Original Message-----
>> From: bldg-sim-bounces at lists.**onebuilding.org<bldg-sim-bounces at lists.onebuilding.org>[mailto:
>> bldg-sim-bounces@**lists.onebuilding.org<bldg-sim-bounces at lists.onebuilding.org>]
>> On Behalf Of RobertWichert
>> Sent: Wednesday, January 16, 2013 9:24 AM
>> To: EnergyPro at yahoogroups.com; 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
>> FAX +1 916 966 9068
>>
>>
>>
>>
>>
>>
>>
>> ==============================**=================
>>
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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
Website: www.wholebuildingsystems.com
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