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 Doron Bracha Apr 29, 2014 11:11  |
Interesting proposal, natural ventilation has many advantages, and the stack effect has been known for many years:
http://en.wikipedia.org/wiki/Stack_effect
http://www.arpapress.com/Volumes/Vol11Issue2/IJRRAS_11_2_14.pdf
Yet keep in mind this doesn't necessarily apply to all locations and all building types.
In cool climates, you can get sufficient ventilation and cooling by opening windows for cross ventilation during the summer. Most of the year it's too cold to consider this.
Schools, hospitals and other large public buildings need to filter the air and ensure its quality, and that includes humidity. Mechanical engineers sometimes prefer limiting the natural ventilation since it compromises the performance and efficiency of the HVAC system. Instead, they specify highly efficient systems, with energy recovery wheels and other features.
Another thing to consider is that roof access can sometimes be limited. Windows are usually more easily accessible, yet even those may be limited to opening only 4"-6" for safety.
We need to also remember the human factor, is the system automated and programmed, or operated by people? we sometimes forget to open or close, turn on or turn off etc.
Overall the proposal is valid and interesting, and I would recommend doing some more research, focusing on certain climate zones and providing more info on the system components and operation.
Cheers !..
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 Sara Magalhaes May 3, 2014 10:44  |
Hi Valles,
Thanks for your interesting proposal!
Can you please complete the rest of the categories such as the costs, benefits, reduction of CO2 emissions and time line?
Best!
Sara
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 Gunes Hellweger May 27, 2014 07:34 |
Valles,
Natural ventilation is a passive building system and is definitely preferable. Although, I think you should
develop your proposal by adding more details. You may suggest a few ventilation types for different building systems.
For instance, multi story buildings may require a more advanced system than single story buildings. You may do a comparison on that.
You may also work more on how much we could save from A/C costs as well as carbon emission reduction, refrigerant management etc.
Best wishes,
Gunesh
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 Derrek Clarke Jun 4, 2014 04:56  |
Hi Valles
Thanks for your proposal. Natural ventilation is a great idea that has many iterations. There are simple versions for single story homes such as underfloor venting. High rise construction also has a version used through the idea of a double skin wall. Where there are 2 exterior walls and the cavity created between the 2 is used to draw cool air in at the bottom, while warm air escapes through the top. This creates a vacuum effect pulling air through. When the windows on the interior wall are open you can get good circulation. With this in mind, I think you should be a bit more specific on which building types you would concentrate on and the best way to achieve the conditions you invision.
Please also keep in mind that natural air flushing of HVAC systems is common as well, but i'm sure the process can be improved upon!
Good Luck!
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Sara Magalhaes Jul 5, 2014 12:16 |
Hi Valles,
The contest deadline is near! Please don’t forget to complete your proposal so that it is easier for potential supporters to elaborate upon your ideas.
Best
Sara
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