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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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    • CommentAuthorAbbaye
    • CommentTimeMar 12th 2008
     
    Ummng and ahhing about log boiler compared to cooking range plus back up system. Looking at the log boilers I just need to get my head around how they work ...... you need a boiler, and an accumulator tank .... does the accumulator tank store your hot water?? Is that basically your supply of DHW plus water for rads/underfloor heating??

    Sorry for such a basic question but I am new to this!
    Thanks
    Abbaye
    • CommentAuthortony
    • CommentTimeMar 12th 2008
     
    No, not usually, it stores hot water from which your DHW is made and supplies heat to the heating system too -- kind of heat store/buffer tank often very hot.
    • CommentAuthorJohan
    • CommentTimeMar 12th 2008
     
    The accumulator tanks come in two main versions really.

    1. With a coil at the top for the DHW. In which case the DHW is generated on demand, just like a combi boiler.

    2. With a built in hot water cylinder at the top of the accumulator tank, which works as a normal hotwater tank in that case.

    Have you got free logs? You'll need more logs then you think to keep the house warm...
  1.  
    Johan is right, I burn 10 cubic metres of paid for logs a year and no end of free waste softwood in a 20kw boiler and 5 kw stove.

    The moral is if you look hard enough there are plenty of people with waste wood to dispose of. Like all things in life theres no such thing as a fre meal!

    However would I go back to oil heating? No way Pedro! (as Del boy would say)
  2.  
    abbaye

    we have both a log boiler and a cooking range.we have two tanks a DHW and an accumulator.Output from range goes through coil in DHW tank and then into accumulator and back to range. log boiler goes straight to the accumulator tank.coil then from accumulator goes to radiators. Theory is range on 24/7 heating DHW once hot excess goes to accumulator. Any additional heat required then we light log boiler in living room which provides extra heat to accumulator and the thermostatic radiators in the living room switch off giving more heat to the rest of the house.
    • CommentAuthorskywalker
    • CommentTimeMar 13th 2008
     
    Have a look here:

    http://www.heatweb.com/

    explains how one flavour of heat store works.

    S.
    • CommentAuthorsune
    • CommentTimeMar 13th 2008
     
    You don't need a heat accumulator tank at all traditionally people would plumb a range in so it heats the hot water and some radiators. You light it when you need to. If you want a bath you'd need to light it beforehand.

    Having said that they can be a really good idea if you want to:

    1 - store up heat so you do not have to burn the stove all they time
    2 - regulate the heat output to your house
    3 - combine heat sources

    Basically the tank holds a large volume of water which your heat source(s) heat up. This is now stored energy and stays in the tank as it's well insulated.
    You extract heat from the top of the tank to provide hot water (Because the top of the tank is hottest ).
    You extract heat from lower down to provide heating.
    Good tanks will tend to striate - ie you'll have a layer of hot water at the top and then cooler water below. This means you can carry on getting hot water for longer.

    That site that Skywalker mentioned is very good. Dunster wood fuels also deal in some tanks here is their site:
    http://www.dunsterwoodfuels.co.uk/tanks.html

    I made my own from steel (well I got a metal fabricator to make it) but it won't be as good as these other ones....then again it cost around £250 all in which is probably about 10 times less....
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