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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

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Fundamentals: In a reasonably airtight house does opening a window constitute ventilation?

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  1.  
    • CommentAuthortony
    • CommentTimeMay 27th 2011
     
    In a reasonably airtight house does opening a window constitute ventilation?
  2.  
    You'll get displacement ventilation due to the warm air rising out of the top of the window & cool air falling in through the bottom of the window. However, I guess you'll need to open two windows to get true purge ventilation.

    David
    • CommentAuthorpmagowan
    • CommentTimeMay 27th 2011
     
    I have now developed automatic ventilation. During the recent storms one of my single glazed sash windows was sucked out!! This certainly aided the already adequate ventilation that the rickety old windows provide. I suppose your definition of 'reasonably airtight' is stricter than mine :bigsmile:
    • CommentAuthorskyewright
    • CommentTimeMay 27th 2011 edited
     
    Posted By: pmagowan...one of my single glazed sash windows was sucked out!!...I suppose your definition of 'reasonably airtight' is stricter than mine

    Well, it must have been at least a bit airtight else there wouldn't have been a pressure differential? :wink:

    If it was on the sucking side of the house I hope that at least meant that not too much rain got in through the hole...
    •  
      CommentAuthorSteamyTea
    • CommentTimeMay 27th 2011
     
    Tony
    Do you mean for regulations or just for 'consumer controlled ventilation'. I have to ventilate by opening windows now the house seems reasonably airtight (still thinking about the relationship between pressure and flow with regard DIY pressure testing). There was some research I read a few years ago about allowing office worker to open windows rather than rely on the built in climate control. Because the workforce felt 'empowered', they were more productive, which counteracted the losses from lack of heating/cooling control.
    There is not a one size fits all answer to that issue.
    • CommentAuthorJoiner
    • CommentTimeMay 28th 2011
     
    ST - Who wasn't paying attention in the webinar yesterday?

    Related download available here...

    http://www.energybenchmarking.co.uk/Offices/download.asp
    •  
      CommentAuthorSteamyTea
    • CommentTimeMay 28th 2011
     
    I was out, Fridays are a busy day for me.:sad:
    • CommentAuthorbrig001
    • CommentTimeMay 28th 2011
     
    I would have thought diffusion would dominate on a still warm day and pumping on a windy day and, as davidfreeborough says, convection on a still cold day.

    Brian.
    • CommentAuthortony
    • CommentTimeMay 28th 2011
     
    I disagreed with the comment on webinar yesterday which prompted my question.

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