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

Akshay Gupta akshaykg at gmail.com
Sun Nov 5 06:18:23 PST 2017

Hi Attiq

I understand how the heat loss is reduced. But in real world, the space is conditioned to 24 deg c inside while outside is more than 40 deg c. Hence there would always be a heat gain from outside and if the glass- u value is reduced then  cooling consumption should reduce. Otherwise with both wall and glass u-value reduction there should be increase in cooling consumption. Which means that envelope insulation is not good strategy.

Or is it that the simulation calculations are based in natural heat loss or gain first and based on the resultant load, the building cooling energy is calculated.

Your views are welcome on the above.



Sent from my iPhone

> On 4 Nov 2017, at 02:01, attiq.urrahman <aur at bepc.biz> wrote:
> Akshay,
> You are not making a mistake. The electric consumption for cooling will be increasing as the heat loss is reduced from the building. Check the cooling consumption in the output file.
> Attiq
> From: akshay gupta [mailto:akshaykg at gmail.com] 
> Sent: Friday, November 03, 2017 8:38 AM
> To: bldg-sim at lists.onebuilding.org
> Subject: [Bldg-sim] eQuest - Energy consumption increasing on reducing Glass U-Value
> 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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