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

[Jim Dirkes]

That's good to know and rules out my scenario.

I think I can't help more without more details, but I'm also unfamiliar
with eQuest.

If you were using EnergyPlus, I'd recommend adding a set of detailed output
variables to study the energy use pattern more closely. Perhaps you can do
something like that with eQuest....

On Fri, Nov 3, 2017 at 9:18 AM, akshay gupta <akshaykg at gmail.com> wrote:

> Hi Jim
>
> Thanks for the reply. Actually, the project we are modelling are designed
> to be energy efficient commercial spaces. So for example, interior LPD is
> not more than 0.5 W/sqft (LED lights), EPD is around 2.0 - 2.5 W/sqft,
> Occupant Density is around 50 Sqft /person. So I dont see any area where
> internal heat gain is unusually higher where the building needs to cool
> itself off by conducting heat outside (inside hotter than outside).
>
> I think there something else.
>
> Regards
>
> Akshay
>
> On 3 November 2017 at 18:42, Jim Dirkes <jim at buildingperformanceteam.com>
> wrote:
>
>> 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
>> <https://maps.google.com/?q=1631+Acacia+Dr,+Grand+Rapids,+MI+49504&entry=gmail&source=g>
>>
>> (alphabet soup of efforts for greater understanding: PE, BEMP, BCxP, LEED
>> AP)
>>
>> Direct / Mobile: 616.450.8653 <(616)%20450-8653>
>> jim at buildingperformanceteam.com
>>
>> Website <http://buildingperformanceteam.com>l  LinkedIn
>> <https://www.linkedin.com/pub/jim-dirkes/7/444/413>
>>
>> *Coffee conversation:*Humility is loving the truth so much that you are willing to hear it from everyone.
>>
>>
>>
>>
>


-- 

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
jim at buildingperformanceteam.com

Website <http://buildingperformanceteam.com>l  LinkedIn
<https://www.linkedin.com/pub/jim-dirkes/7/444/413>

*Coffee conversation:*Humility is loving the truth so much that you
are willing to hear it from everyone.
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