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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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Building Regulations and Standards: SAP 2010 (or whateffa?)

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  1.  
    • CommentAuthorbobirving
    • CommentTimeAug 18th 2009
     
    I have been researching SAP2009 as part of my thesis on the dreaded heat pumps and came across this luverley document at http://www.2010ncm.bre.co.uk/page.jsp?id=2. It's called the "Detailed description of the flat 25% approach for dwellings". At the moment, I honestly can't be bothered to try to understand it, but at first sight, it looks like a giant fudge. How can anyone claim that the SAP approach is at all authoritative, while producing schemes like this? Would it have been avoided by adopting the PassivHaus approach of requiring an absolute value for energy load? When will BRE realise that they are in a Code for Sustainable Hole and stop digging?

    Bob
    • CommentAuthorbobirving
    • CommentTimeAug 12th 2010
     
    I've just noticed that nobody has responded to the above in almost exactly a year..... In which time, I have moved on to Appendix N/Q (honest, I've done other things in the meantime).

    I really think that SAP is now almost meaningless. It is so convoluted that I cannot see how anyone can think that its ratings mean anything any longer. The SAP document needs re-writing in English with some kind of meaningful structure. There are tables that contain equations and equations that contain tables. It has breakdowns by month which it admits are erroneous, with only the yearly totals being valid. The heat pump appendix is slinkied lovingly around the microCHP calculations and hyperventilates through the HRV estimates.

    Wonder if anyone will reply to this post????
    • CommentAuthorevan
    • CommentTimeAug 12th 2010
     
    No idea what you're talking about but you have a great writing style, keep it up ;)
    •  
      CommentAuthorSteamyTea
    • CommentTimeAug 12th 2010
     
    What is this research for?
    •  
      CommentAuthorDamonHD
    • CommentTimeAug 12th 2010
     
    Polemic aside, I found that the SAP gave a pretty damn good estimate (ie vs real bills) of my house's energy performance, overall and in details such as the construction of our walls, long since lost/forgotten by the council for whom the properties were built.

    Rgds

    Damon

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