[Bldg-sim] Help: Simulation of External Zone_Courtyard

[RACHIT KUMAR]

Hello Sir,

Thanks for the reply.
I understand there are certain limitations with the approach because I am
attempting to model an external space using an enclosed zone.
I need few more favors regarding the solution you explained for 24/265
simulation in CFD. I am not very familiar with technicality of tools,
weather files and such stuffs. But I have to go in depth to solve the
problem. So can you please help me out in this? Could you explain me the
programming part and things related to precede this.

I am trying Design Builder CFD tool.


Thanks


Rachit



On Mon, Mar 30, 2009 at 9:14 PM, Vikram Sami <VSami at lasarchitect.com> wrote:

>  Rachit,
>
>
>
> When dealing with comfort conditions in passively conditioned spaces,
> you’re going to have a hard time coming up with accurate models – especially
> outdoor conditions. That being said, I think CFD is probably the best
> equipped for this. Your hourly analysis program (like E+, eQUEST etc) use a
> lumped node method of calculation – so a space (or thermal zone) will have a
> single temperature, a wall has a uniform temperature. In a mechanically
> conditioned space, this is a reasonable approximation since most often the
> air is mixed and not stratified. However, in passively conditioned spaces,
> there is often a larger degree of thermal variation within spaces – in both
> temperature and MRT, so it becomes necessary to study it with full-field
> solution tools like CFD.
>
>
>
> One method to overcome the inability to do a 24/365 simulation in cfd is to
> create temperature bins from your weather file and run separate simulations
> for each bin. You can then approximate how many hours fall into each bin. In
> most cases (especially the hotter hours), the temperature bins will also
> correspond to times of day, so you might be able to get away with doing a
> single sun position for each temp bin.
>
>
>
> Hope this helps.
>
>
>
> *Vikram Sami,* LEED AP
> Direct Phone 404-253-1466 | Direct Fax 404-253-1366
>
> *L**ORD**, A**ECK** & S**ARGENT** A**RCHITECTURE**
> *1201 Peachtree Street NE, Suite 300, Atlanta, GA 30361
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>
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>
>
>
>
>
> *From:* bldg-sim-bounces at lists.onebuilding.org [mailto:
> bldg-sim-bounces at lists.onebuilding.org] *On Behalf Of *RACHIT KUMAR
> *Sent:* Monday, March 30, 2009 11:26 AM
> *To:* bldg-sim at lists.onebuilding.org
> *Subject:* [Bldg-sim] Help: Simulation of External Zone_Courtyard
>
>
>
> Hello
>
> I am trying to understand the thermal comfort of the courtyard with varying
> proportions, height, glazing (building glazing adjacent to courtyard) in
> different climatic zones of India. I want to study the thermal comfort only
> till 10 feet height of the courtyard from ground level (average operable
> temperature of the courtyard zone till 10 feet height).
>
> So few questions regarding model and simulation tools:
> 1) Which tool can model and simulate outdoor spaces (courtyard) ?
> 2) How to make a open courtyard as a zone? Courtyard is a part of building.
>
> 3) I need to make a virtual horizontal partition in the courtyard at a
> height of 10 feet from ground floor.
>
> I tried some simulation on Design Builder but could not get correct
> results.
> I don't want to use CFD because I am interested in hourly thermal
> performance of the courtyard and want to find the comfortable hours
> throughout the year. Kindly help me.
>
> Thanks
>
> Rachit
>
>
>
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