[Bldg-sim] Reg: Query For DesignBuilder

Kiran Ghosh kirankghosh31 at gmail.com
Wed Sep 5 22:17:26 PDT 2018


Hi Jim,

I have checked each IDF file and the inputs and schedules. It is literally
the same model with only the U values for external walls changed. Could
this possibly affect the equipment and lighting load?

On Thu, 6 Sep 2018 at 01:38, Jim Dirkes <jim at buildingperformanceteam.com>
wrote:

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> All lighting and equipment values are within 1% of each other. That's
> probably close enough to be considered "the same", considering the complex
> E+ calculations and some rounding errors, but it is less close than seems
> reasonable. Have you compared inputs and schedules for each of those in
> each IDF?
>
> On Wed, Sep 5, 2018 at 8:56 AM, Kiran Ghosh via Bldg-sim <
> bldg-sim at lists.onebuilding.org> wrote:
>
>> Hi,
>>
>> I am currently modelling a simple HVAC model on DesignBuilder. I need to
>> run the simulation to obtain annual electricity consumption due to Cooling,
>> Lighting and Interior Equipment for different construction materials. For
>> some reason, while all the input is the same apart from the U value for the
>> external wall, the electricity end-use for lighting and interior equipment
>> changes as follows:
>>
>> U value Lighting Equipment
>> 2.04 496.38 885.89
>> 2 494.72 880.84
>> 1.85 487.9 860.3
>>
>> The LPD and Equipment Power Density remains the same with the same
>> schedule, why is the annual electricity consumption changing?
>> --
>> Thanks and Regards
>> Kiran K Ghosh
>> +919582904515
>> +918152036434
>> kirankghosh31 at gmail.com
>>
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>
>
> --
>
> James V Dirkes II, CEO / President
> The Building Performance Team Inc.
> 1631 Acacia Dr, Grand Rapids, MI 49504
>
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>
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>
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>

-- 
Thanks and Regards
Kiran K Ghosh
+919582904515
+918152036434
kirankghosh31 at gmail.com
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