[Equest-users] [Bldg-sim] Expert advice on Wall Insulation study in eQuest

[Joe Huang]

Mayank, Daniel,

I think it's a good idea to look at the component loads in the LS-C 
reports, but I want to add some words of caution.
The loads (actually heat flows) shown in those reports are calculated at 
the constant Reference Temperature, and categorized as either heating or 
cooling if the total load of the building that hour is negative or 
positive. These loads are corrected when DOE-2 solves for the actual 
room temperature based on simple UA-deltaT principles.  If you want the 
corrected wall loads, you need to get an hourly report of the wall loads 
and then correct for the temperature difference Troom - Treference.

I'm not sure if this level of detail is warranted, though.  I also 
suspect there's some other compounding effect that's giving you the 
results that you report.

Joe

Joe Huang 	
White Box Technologies, Inc.
346 Rheem Blvd., Suite 205A
Moraga CA 94556
yjhuang at whiteboxtechnologies.com
http://weather.whiteboxtechnologies.com for simulation-ready weather data
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On 4/23/2015 6:18 AM, Daniel Knapp wrote:
> Hi Mayank,
>
> I recommend opening up the SIM file (you can do this by going to Tools -> View Simulation Output) and looking at the LS-C and LV-D reports. In the LS-C report you can find the contribution to the peak heating and cooling loads that come from the walls. From this you should be able to figure out how the wall conduction is changing as a fraction of the peak loads as you decrease the wall U-value. In the LV-D report (scroll to the very end of it) there is a summary of the U-values for each exterior surface. This might be a good place to look to make sure that the effective U-values that eQUEST is simulating are matching up with your expectations of what the U-values should be.
>
> I would agree that the energy savings should saturate at some point.
>
> All the best,
> Dan
>
>
> —
> Daniel Knapp, PhD, PPhys, LEED® AP O+M
> danielk at arborus.ca
>
> Arborus Consulting
> Energy Strategies for the Built Environment
> www.arborus.ca
> 76 Chamberlain Avenue
> Ottawa, ON, K1S 1V9
> Phone: (613) 234-7178 ext. 113
> Fax: (613) 234-0740
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>
>
>
>> On Apr 23, 2015, at 5:00 AM, Mayank Bhatnagar <mayank.23aug at gmail.com> wrote:
>>
>> Hi Claire,
>>
>> Thanks for your response.
>>
>> The analysis has been done on an 8 hour operating office building in New Delhi. The mechanical system is packaged single zone system with electric resistance heating.
>>
>> Please let me know if you need more information.
>>
>> Thanks
>>
>> Regards,
>> Mayank
>>
>> On Thu, Apr 23, 2015 at 2:25 PM, Claire Das Bhaumik <claire at inklingllp.com> wrote:
>> Mayank,
>>
>> I think we need to know a bit more about the building:
>> - Location (some parts of India are cool, others hot!)
>> - Building usage - office, domestic, retail? Hours of use?
>> - Servicing - heating and cooling? Mechanical or natural vent?
>>
>> Regards,
>>
>> Dr Claire Das Bhaumik CEng FCIBSE
>>
>> Partner - Inkling LLP
>>
>>   
>>
>> e: claire at inklingllp.com
>>
>> t:  07950 282800
>>
>> w: www.inklingllp.com
>>
>> Follow us on Twitter: @DasInkling
>>
>> Partnership No. OC367619
>>
>>
>> On Thu, Apr 23, 2015 at 9:51 AM, Mayank Bhatnagar <mayank.23aug at gmail.com> wrote:
>> Dear All,
>>
>> We are working on a national level research project in India. A building envelope analysis is a part of this project. By doing analysis, we have found a vague results in trend (linearly downward) of reduction in energy consumption with reducing wall U-value in eQUEST.
>>
>> Theoretically, the energy consumption should approach to stagnant with reduction in wall U-value.
>>
>> Please refer figure.
>>
>> Appreciate if anyone put light on this.
>>
>> Thank you.
>>
>> Regards,
>>
>> Mayank Bhatnagar
>>
>> Theoretical should come like this.
>> <image.png>
>>
>> In eQuest the trend is-
>> <image.png>
>>
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