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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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    • CommentAuthortony
    • CommentTimeOct 23rd 2017
     
    No, you would need anhydrous copper sulphate and several lorry loads would last a year.
    •  
      CommentAuthordjh
    • CommentTimeOct 23rd 2017
     
    Has anybody tried using a desiccant dehumidifier? I see there is a solar thermal powered product in the US, but I have no idea whether that's any better than using PV to power a normal one.
    •  
      CommentAuthorfostertom
    • CommentTimeOct 23rd 2017
     
    Got a desiccant dehumidifier - extremely good. Don't think of buying a compressor-type one - only efficient in the hot humid tropics.
    • CommentAuthorgoodevans
    • CommentTimeOct 24th 2017
     
    I've just done a back of the envelope for Bodmin airfield (Warleggan) from the historic data on the weather underground site - for the whole of 2016 I get an average due point of around 7.25 degrees (I'm not sure its valid to average due pint temperatures like this but it will be close-ish) This when air with a duepoint of 7.25 degrees is heated to 20 deg C it gives a RH of about 45% - with a massive moisture buffer in the fabric of a house I can see it is possible to keep internal RH in this region for a whole year.
    •  
      CommentAuthorSteamyTea
    • CommentTimeOct 24th 2017
     
    I think it is very easy to sucker ourselves into believing that a 'damp' climate is a lot worse than it really is.

    Here is the mean air temperature and RH for Gander, NL (so far this year), Gander is at a latitude of 50°N, so the same as Hayle.

    Gander
    Mean Temp 7°C
    Mean RH 79%
    Mean Dewpoint 3°C

    Hayle
    Mean Temp 13°C
    Mean RH 85%
    Mean Dewpoint 10°C

    So while that are different, and only for a part year, they are similar on RH
    • CommentAuthorBeau
    • CommentTimeOct 24th 2017
     
    Not sure the mean RH is the issue though. It's times like this when outside RH is 100% with 15C and it's been similar for days.
    •  
      CommentAuthorSteamyTea
    • CommentTimeOct 24th 2017 edited
     
    Gander has a much flatter RH distribution when binned by temperature than Hayle, but still not that different.
      Gander and Hayle RH.jpg
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