[Equest-users] Increased Energy for Cooling with Increasing Insulation and Decreasing Infiltration

[Cristian Salvador Jara Toro]

I agree with both, Jeremiah and Christian. In my IES<VE> experience, I
hhave had the same results by increasing insulation in exterior walls and
roof, without any changes on internal gains. And my conclusion was, while
increasing insulation, heat from internal gains cant "escape through the
walls", so cooling equipment have to do his job whatever is happening
outiside with dry bulb temperature.

Hope this helps.
*

Cristian Jara Toro*
Ingeniero Acústico

Cel: 6 207 8566




On Mon, Jun 11, 2012 at 8:43 AM, Christian Kaltreider <
ckaltreider at sudassociates.com> wrote:

> Hi Dan,****
>
> ** **
>
> This is a common result.  You may want to search the archives, as this has
> been discussed in depth before.****
>
> ** **
>
> Many buildings, particularly non-residential buildings, are ‘internal
> loads dominant’ rather than ‘envelope dominant’.  This means that the
> majority of the cooling energy is spent removing heat from lighting, plug
> loads, people and perhaps solar gains.  None of these things are dependent
> on outside temperature.  So in an internal loads dominant building, there
> can be many hours out of the year in which the building is in cooling mode
> while the outside temperature is lower than the inside temperature.  During
> these hours, heat transfer through the walls (from inside to outside) and
> infiltration are beneficial from a cooling standpoint.  They act as a sort
> of uncontrolled economizer, reducing the amount of cooling required by the
> mechanical system.  Increasing insulation reduces this beneficial effect.*
> ***
>
> ** **
>
> I hope this helps,****
>
> Christian****
>
> ** **
>
> *From:* equest-users-bounces at lists.onebuilding.org [mailto:
> equest-users-bounces at lists.onebuilding.org] *On Behalf Of *Daniel Wright
> *Sent:* Monday, June 11, 2012 1:03 AM
> *To:* equest-users at lists.onebuilding.org
> *Subject:* [Equest-users] Increased Energy for Cooling with Increasing
> Insulation and Decreasing Infiltration****
>
> ** **
>
> Hello all,
>
> I am a relatively new eQuest user and am encountering some non-intuitive
> results.
>
> If I make an eQuest model for a default building using just the default
> values for everything, and then use the Energy Efficiency Measurement
> Wizard to increase the insulation (roof or wall) or decrease the
> infiltration, I see the annual energy used for heating decrease in both
> cases (which I would expect), and the cooling energy increase in both cases
> (which I wouldn't expect). I've tried this for two of the default building
> types (Two story office building and Mutifamily low rise) and two different
> climates (LA and NYC), and get the same results. I've also seen the same
> behavior in other building models that I've created that differ in many
> respects to these default cases.
>
> Can someone please explain how this is possible?
>
> Dan****
>
> _______________________________________________
> Equest-users mailing list
> http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org
> To unsubscribe from this mailing list send  a blank message to
> EQUEST-USERS-UNSUBSCRIBE at ONEBUILDING.ORG
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20120611/74474c6b/attachment-0002.htm>