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

[David Eldridge]

Also the SEER only helps you while the A/C is on...meanwhile the lights are chugging along at "budgeted" rates every day eating away your 10% reduction in cooling end-use.

DSE Mobile

On Jan 16, 2013, at 4:12 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?"
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> 
> Robert Wichert P.Eng. LEED AP BD&C
> +1 916 966 9060
> FAX +1 916 966 9068
> 
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> ===============================================
> 
> 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 [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; 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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