[Bldg-sim] help in PhD research - solar chimney simulation

[Paul Carey]

Hi Leticia

 

I note you are going to be attending the DesignBuilder webinar I'm giving
soon, so hopefully I'll be able to cover things in that which will allow you
to see how this could to some extent be carried out in DesignBuilder E+ and
CFD.

 

I would however note, the issue of flow instability will be difficult to
correctly establish and model in many tools.   Further, as you will need to
consider the effects of buoyancy combined with wind effects on chimneys, I'm
not certain that the algorithms used in the E+ will be able to deal with
this sufficiently accurately to allow comparison with the test cell.
Perhaps others on this list might be able to provide further insight on
this, but things that spring to mind include unsteady flow effects and
discharge coefficient variation.  At the very least your modelling will
require careful application of appropriate wind surface coefficient values
in the E+ model but I won't go into too much here as it will bore everyone
else rigid.  It is possible to get reasonable comparison as is pointed out
in the following IJoV paper, but I think you may be forced down the route of
complex turbulence modelling to get good accuracy of your CFD which may
force you down an alternative software route.   That being the case, it will
still be worth carrying out the E+ model and getting some boundary
conditions that puts your CFD simulations in the right area first off and
hence should increase the accuracy of them or at least allow them to get
somewhere near a reasonable solution.  You might want to check out FDS which
will allow you to carry out transient LES turbulence models which I think
will be better for your research.  

 

I'll try and get an electronic copy of my PhD thesis together for you and
you might also wish to check out the links to following papers that might
help you:

 

http://www.ijovent.org.uk/IJV%20Vol%204/IJV%20V4%20No%204/IJV%20Abstract%20V
ol%204%20No4%20Paper%204.htm

 

http://bse.sagepub.com/cgi/content/abstract/20/3/131 (CIBSE BSERT paper
based on early portion of my research)

 

http://linkinghub.elsevier.com/retrieve/pii/S0167610599001361

 

 

Regards

Paul

 

 

 

 


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Dr Paul Carey

BSc (Hons) PhD FRSA

Director

Low Carbon Energy Assessor

 

Zero Energy Design Ltd

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Stalybridge

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From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Leticia Neves
Sent: 09 December 2009 19:03
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] help in PhD research - solar chimney simulation

 

Hi,

 

My PhD research is about the use of a tilted solar chimney to enhance
natural ventilation by stack effect, in Brazil.

I have built a test cell (picture attached) and I want to do computer
simulations of the solar chimney I proposed, in order to do some parametric
analysis and to verify the performance in several locations through the
country.

I tried to use EnergyPlus but it wasn't very successfull.

I need a suggestion of sotware that is suitable for what I need. Does anyone
have an indication?

In case of using TRNSYS, it is possible to do this kind of simulation with
the demo version, or do I have to have the TRNFlow module? (not available at
demo version)

 

Thanks.

Leticia

 

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