[Equest-users] Huge envelope changes having small affect on energy savings

[Sami, Vikram]

I didn't see any changes in the envelope between the 2 inp files you sent me. However the first file (Rindge-1) seemed to have a California weather file while the second one had Boston. When I switched them both to Boston - the numbers were almost identical.

I don't think you have modeled your skin correctly.



Vikram Sami, LEED AP BD+C
Sustainable Design Analyst
1315 Peachtree St. NE, Atlanta, GA 30309
t: 404-443-7462    f: 404.892.5823       e: vikram.sami at perkinswill.com   www.perkinswill.com<http://www.perkinswill.com/>
Perkins+Will.  Ideas + buildings that honor the broader goals of society


From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Ron Pecarina
Sent: Wednesday, August 22, 2012 4:44 PM
To: Lee Chorney
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Huge envelope changes having small affect on energy savings

>From what I see from these input files, the zone AC/Hr went from 0.2 to 0.8.  I did not note a change in any R-value from 4 to 20.  The increased ventilation load is the likely culprit.
On Wed, Aug 22, 2012 at 1:42 PM, Lee Chorney <leec at alliedconsulting.net<mailto:leec at alliedconsulting.net>> wrote:
Hi Guys,

Here all the .inp files. 1.inp is the base and 2.inp is the proposed.

Thank you,

Lee

On Wed, Aug 22, 2012 at 12:48 PM, Lee Chorney <leec at alliedconsulting.net<mailto:leec at alliedconsulting.net>> wrote:
Hi All,


I recently did a model where I had the same system in both base and proposed but I changed the R-Value from 4 (base) to 20 (proposed). I also changed the window U-value from .80 (base) to .35 (proposed). After I did the run, I saw only a 5% savings between the heating and cooling use in the model. When I looked at the loads I saw the base had twice as much cooling and heating load than the proposed. Does any know why the energy savings would only be 5% when you have a huge difference between the cooling and heating loads?

Thanks,

Lee


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--
Ron Pecarina, PE, CEM, LEED-AP BD&C
Energy and Sustainable Design Consultants, Inc.
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