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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.
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Heating and cooling: They are winding me up!

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  1.  
    • CommentAuthortony
    • CommentTimeSep 21st 2023 edited
     
    Room 13m x 6m with suspended un insulated wooden floor, single glazed draughty windows, 380mm solid brick walls and a bay window with French doors and 225 brick walls under the windows and un insulated hipped roof over it. Main room two outside walls.

    I said insulate the floor 150mm 100mm batts with 50mm EPS, and IWI 80mm PIR, draughtproofing, secondary glazing, insulate bay roof

    What is the difference gas heated 7 days and 7 evenings 21C, night time 14C

    Any guesstimates or do we need more info
    • CommentAuthorbhommels
    • CommentTimeSep 22nd 2023
     
    The main difference is that it is a nasty room to be in currently, and it will be nice and cosy afterwards.
    I guess the answer expected is savings in £/year? Then let's put a price on comfort first.
  3.  
    Is the hipped roof over the whole room?

    If so Current heating
    (13+6)X2.5 m² x 2U + 13x6m² x 2U + 13x6m² X 1U
    x 2000 HDD X 24h/d / 3600
    +20% for drafts

    = 5000 kWh/y = £500/y


    Proposed
    (13+6)X2.5 m² x 0.5U + 13x6m² x 0.1U + 13x6m² X 0.2U
    x 2000 HDD X 24h/d / 3600
    +10% for ventilation

    = 700 kWh = £70

    Save £400/y

    Biggest losses are the roof and floor

    If there is a heated upstairs, then less.

    Want better numbers, do a SAP.
    • CommentAuthortony
    • CommentTimeSep 22nd 2023
     
    G/f room in a big house, hipped roof over the bay window only

    Thanks millions Will.

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