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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.

PLEASE NOTE: A download link for Volume 1 will be sent to you by email and Volume 2 will be sent to you by post as a book.

Buy individually or both books together. Delivery is free!


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    • CommentAuthorFENG
    • CommentTimeNov 10th 2008
     
    For sale, camera plus all accessories.

    http://www.metrum.co.uk/images/TH9100pro.pdf

    Only 6 months old, used about twice a month for domestic energy surveys. Its in perfect condition.

    We are currently changing our core business.

    £15,000 Or Nearest Offer

    I am based in Ireland, please leave a message on +35391395603 if you are interested.
    • CommentAuthorGBP-Keith
    • CommentTimeNov 10th 2008
     
    Is the comma in the right place?
    • CommentAuthorFENG
    • CommentTimeNov 10th 2008
     
    It sure is Keith!

    Its a 320 x 240 camera, 60Hz, -50 degrees to 500 degrees capability....

    It retails for approx £19K I think.

    Basically, i can rent a similar camera from a guy in my local town when I need it so I am looking at selling our own camera.
  1.  
    I wouldnt mind renting something like this, how much would it cost typically for a day/night?
    • CommentAuthorjon
    • CommentTimeNov 11th 2008
     
    You will find that the price of second hand construction equipment has fallen somewhat more than you might expect in the last few months.

    Good luck selling though.
    • CommentAuthorJackyR
    • CommentTimeNov 11th 2008
     
    hotelRefurber, I've just been quoted £250+ deliver charge + VAT for a week's hire (min period) of a FLIR B50 thermal imaging camera.

    Enough to put me off the whole idea, so didn't shop around.
    • CommentAuthorFENG
    • CommentTimeNov 11th 2008
     
    Well, Its not the end of the world if I dont sell it, I am getting 2/3 jobs per month for it. Its just that I have done a deal with a guy locally in the west of ireland who'll rent me a camera so financially if I sold it it allows me to invest money elsewhere in the business...

    Thanks for the comments anyway!

    As for renting it, I can rent a similar camera for €100 a day but I know the guy!
    • CommentAuthorEd Davies
    • CommentTimeNov 13th 2008
     
    These IR cameras are no doubt really good for quickly getting an overview of the heat loss from a building and finding the hotspots in a really simple manner but a much cheaper way of exploring what's happening is to use an IR thermometer. They only cost £30ish and work just like a one-pixel poorly-focused version of an IR camera.
    • CommentAuthormark_s
    • CommentTimeNov 13th 2008
     
    How about an IR conversion of a dslr/bridge camera? Can be done cheaply enough.

    Does the fancy £££££ thing do something special? Am I being very ignorant?
    • CommentAuthorEd Davies
    • CommentTimeNov 13th 2008 edited
     
    Ordinary visible (to human eyes) light has wavelengths from around 0.4 µm (violet) to around 0.7 µm (red). The sensors in DSLRs, etc, are sensitive out to near-infrared light with wavelengths up to somewhere around 1 µm (not sure if they go to 2 µm or so). Normally they have a filter to cut out the invisible, to our eyes, IR between 0.7 and 1 µm) light to avoid having odd colour casts on images but they can be modified, as mark_s alludes to, by removing the filter. E.g., many webcams have the filter on the back of the lens so just substituting another lens (e.g., a telescope) gives you an IR sensitive camera.

    However, the thermal infrared which is of interest to housebuilders is much longer wavelength, around 10 µm. Ordinary camera sensors are not sensitive to this at all, even with all the filters removed.

    I wish there were different words for the different ranges of infrared. Lumping them all together is very misleading as they are important for different purposes and behave quite differently (particularly with respect to absorption by water vapour and COâ‚‚, so important for the greenhouse effect).
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