[Bldg-sim] Help: Simulation of External Zone_Courtyard

[Vikram Sami]

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 

LORD, AECK & SARGENT ARCHITECTURE
1201 Peachtree Street NE, Suite 300, Atlanta, GA 30361 
Responsive Design * Technological Expertise * Exceptional Service 
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P Think GREEN before you print.

 

 

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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