[Bldg-sim] Is there a point to "virtual partitions"?

[Chris Yates]

Hi Cheney,

I'm interested in your results for these equivalent models. Have you 
tried a sensitivity test with respect to time step? I'm wondering how 
much more closely the air temperature will match between the 3 "virtual 
zones" at shorter time steps.

If you can, log down the mean radiant temperatures as well. My hunch is 
that mean radiant will show more divergence than air temperature.

Cheers

Chris

On 27/01/2011 06:42, Cheney wrote:
> Hi Chris and Curtis,
> An interesting topic...
> Curtis, please advice. The virtual partition, to my understanding, is 
> actually No partition. If there is no partition, why color or spectrum 
> characteristics will take effect? I am not so familiar with Energy 
> Plus, but does it have two types of "virtual partition", one is IR 
> transparent and one is not? I also did a quick test in IES VE 
> which can calculate long wave radiant exchange. The way to define 
> virtual partition in IES VE is simply to cut a 100% hole on a solid 
> partition. I tested one room with a window first and the same room 
> divided into 3 equivalent spaces by virtual partitions. It shows the 
> results obtained from the two models are quite similar. It accords 
> with your test by Energy Plus.
>
> Chris, I agree with you that virtual partition is not a 'must' to the 
> perimeter zone. However, in some projects, it is certainly a 
> simplification: without putting up daylight sensor and conducting 
> extra lighting calculation, you can input LPD obtained from lighting 
> designer directly; Or sometimes mechanical designer has specific 
> design in perimeter area and virtual partition method can easily 
> accommodate it without modifying the whole room...etc...etc...
>
> Regards,
> Cheney

-- 

Chris Yates C Eng MCIBSE

/Building Physics Consultant/

Tel:+447960731576

Email: chris.malcolm.yates at gmail.com

Skype: christopher.m.yates

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