[Bldg-sim] Different versions of eQuest produce different results?

[Justin Spencer]

This just happens. None of these models or model versions are "100%
accurate" for estimating consumption. They will vary from version to
version in ASHRAE 140 tests. I'd like to see that different versions of
mature software stay within 5% on each end use, but that's all I'd expect.
For example, check out some Trane Trace results:
https://www.trane.com/content/dam/Trane/Commercial/global/products-systems/design-analysis-tools/analysis-tools/trace-700/ASHRAE%20140-2007%20Results%20-%20v63.pdf

They are 10-20% different than the mean of the comparison suite on a bunch
of different test cases. Is that a problem? Not necessarily.

Simulation is useful for estimating differences in consumption much more so
than actual consumption. If you can pin one end or one point through
calibration of some kind, then your actual savings estimates mean
something. Likewise, if you are just using a model to say whether design
change A or design change B uses less energy, then the model can give you
that kind of decision-making data input.

My advice, which I think is typical practice, is to keep the same software
version for all runs of a given building, even if you go back to it 3 or 4
years later.

On Thu, Jan 28, 2016 at 7:40 AM, Veronica Ochoa <
veronica.ochoa at hurleypalmerflatt.com> wrote:

> Hi all,
>
>
>
> Is anyone aware of any bugs in eQuest that modify specifically the space
> cooling energy results? A LEED model was originally produced in version
> 3.64 build 7130, and when I run it in my later 3.65 build 7154 (without
> making any changes) version the space cooling increases from 60,000 kWh to
> 2,300,000 kWh! Note the heat pump supplementary variable also changes, but
> not by 3,000%.
>
>
>
> I noticed that in the PS-H report my chillers are working (in the later
> version) and in the previous version they are all in 0s. Note nothing was
> changed, just re-ran in different versions.
>
>
>
> I have searched, but haven’t found any bugs related to these specific
> versions. Any thoughts would be much appreciated.
>
>
>
> Thanks in advance,
>
> [image: HPFLogo]
>
> *Veronica Ochoa* | Consultant
>
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>
> *t*    +44 20 7535 3100
>
> *e*   veronica.ochoa at hurleypalmerflatt.com
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