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Natural ventilation with wind-powered roof turbine ventilator and earth-tube

asked 2022-02-09 10:03:17 -0600

fededea94's avatar

updated 2022-02-16 13:47:15 -0600


I need to model a natural ventilation system with an undeground pipe for introduce cool air (I think it can be considered an earth tube) and then I need to model a wind-powered roof turbine ventilator for natural extract the warm air form inside the room of the house. How can I model this? I use DesignBuilder v7.


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@fededea94 what simulation tool are you planning to use? Please mention it in your title or body of the post, as well as the tag, so that others can provide better help.

Aaron Boranian's avatar Aaron Boranian  ( 2022-02-09 15:12:51 -0600 )edit

@Aaron Boranian thanks, I have modified the question.

fededea94's avatar fededea94  ( 2022-02-09 15:21:46 -0600 )edit

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answered 2022-02-11 02:51:10 -0600

Dave's avatar

You will find the earth tube option at the bottom of the HVAC tab. I've seen passive roof ventilators modelled to enhance natural ventilation via both buoyancy and external wind pressure (Monodraught etc.), but I haven't see a wind-powered roof "turbine" ventilator. I'd suggest you raise a ticket on the DesignBuilder Support Desk here for guidance on that:

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Thank you very much, I've seen the earth tube now (I never see before because usually I use calculated natural ventilation and the earth tube there is only with scheduled natural ventilation). I have opened a ticket on the DesignBuilder Support a week ago but I've not yet received an answer. Which kind of passive roof ventilators modelled you have seen? I'm looking for different idea.

fededea94's avatar fededea94  ( 2022-02-11 03:04:48 -0600 )edit

It's been a few years since I modeled one, but try looking for products like a Monodraught Windcatcher: As far as I recall these are fairly easy to model in DesignBuilder.

Dave's avatar Dave  ( 2022-02-11 09:32:26 -0600 )edit

Thank you for the answer. I'll try to start my analysis from this kind of windcatcher. I have a question about this: do I need to model them just as a zone with hole and connected to the zone where I need to have this? Do I need to model other things? Thanks

fededea94's avatar fededea94  ( 2022-02-14 05:10:27 -0600 )edit

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Asked: 2022-02-09 10:03:17 -0600

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Last updated: Feb 11 '22