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

[Lee Chorney]

That is correct it is a 4 story residential building. I did a parametric
run were I changed the Air Chang per hour and U-values for the windows and
wall. I only saw a five percent energy savings when I thought with such a
drastic change (Wall R value from 4 to 30), the difference would be much
better. I have attached the file as a rar.

Thanks in advance,

Lee

On Wed, Aug 22, 2012 at 4:44 PM, Umesh Atre <umesh at innovativedesign.net>wrote:

> **
> Could you also share the equest pd2 files so that someone may take a look
> at the output?
> From the input files, it looks like the only changes you have are on the
> u-value and air-changes/hr (?). No change on the wall/roof construction.
> Also, looks like you are modeling a 3-4 story residential building.
>
>
>  ------------------------------
> *From:* equest-users-bounces at lists.onebuilding.org [mailto:
> equest-users-bounces at lists.onebuilding.org] *On Behalf Of *Lee Chorney
> *Sent:* Wednesday, August 22, 2012 3:43 PM
> *To:* equest-users at lists.onebuilding.org
> *Subject:* Re: [Equest-users] Huge envelope changes having small affect
> onenergy savings
>
> 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>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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