[Bldg-sim] eQuest - Energy consumption increasing on reducing Glass U-Value

Jim Dirkes jim at buildingperformanceteam.com
Fri Nov 3 06:12:00 PDT 2017


Akshay,
While there are many things that could contribute to this situation,
consider:
A smaller U value means that there is *less *conduction through the
construction. With less conduction, a smaller cooling load will normally
decrease cooling energy.

An exception to this is when internal loads are higher than normal. In that
case, the building needs to get rid of internal heat (provide cooling) most
of the year. When the envelope has more insulation (lower U-value), it
inhibits heat removal and can increase cooling energy.

Thanks to my friend Javed Iqbal for reminding me of this recently. He is
preparing a paper which discusses this phenomenon for buildings in the
central European climate.

On Fri, Nov 3, 2017 at 8:37 AM, akshay gupta via Bldg-sim <
bldg-sim at lists.onebuilding.org> wrote:

> Hi There
>
> I am facing an issue in eQuest in almost all simulation models for most
> hot and composite indian climates. Whenever we reduce U-value of glass in
> model, from Single Glazing U-Value of 1 Btu/hr Sqft F to 0.32 Btu/hr Sqft F
> (or any other U-value lower than 1), we see an increase in energy
> consumption.
>
> Can someone point out principal mistake that may be making in the model.
>
> Thanks in advance.
>
> Regards
>
> Akshay Gupta
>
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-- 

James V Dirkes II, CEO / President
The Building Performance Team Inc.
1631 Acacia Dr, Grand Rapids, MI 49504

(alphabet soup of efforts for greater understanding: PE, BEMP, BCxP, LEED
AP)

Direct / Mobile: 616.450.8653
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