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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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Green Living: Burning woody garden waste

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    • CommentAuthorjules
    • CommentTimeJul 21st 2008
     
    ludite
    I didn't pay too much, I didn't have to drive too far to collect it (how many miles are you from Surrey??), it's second hand of course so it ticks that box as well, thus I don't regret buying it. It gives me an extra option, and the shredded mulch will be very useful. But yes your point was well made.

    And no-one actually answered my question: does a very slow fire result in more ash and less gas/CO2 than a fierce fire, or vice versa? Ignoring the smoke issue, I'm still wondering whether a slow fire is better when you don't need the heat.
    •  
      CommentAuthorfostertom
    • CommentTimeJul 21st 2008
     
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      CommentAuthorfostertom
    • CommentTimeJul 21st 2008
     
    Posted By: fostertomManual labour is powered by oxidising hydrocarbon food, releasing CO2, H2O and exothermic energy. The food is produced, transported and cooked, worldwide, thanks to many kinds fossil fuel input. The fossil fuel content of the world's food-as-stored-energy is, I believe, about 80% - without fossil fuel input, world food production would be one fifth of what it is now, with implications for sustainable population levels. The world food industry is a way of converting fossil fuel into food. Doing things by manual labour may well be more fossil fuel intensive than e.g. using a chain saw (or chipper)
    In http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=2112&page=2#Item_2
    Posted By: Chris Wardleyou use less fossil fuel energy travelling by electric bike, charged from the grid, than pedalling due to the huge amount of fossil fuel that goes into getting food to our tables
    • CommentAuthormike7
    • CommentTimeJul 21st 2008 edited
     
    I have a Bosch shredder which is quiet-ish. It is also slow-ish and chops up to about 30mm dia depending on the tree. Cherry is a particular sod because of the way it branches to create fat knuckles - birch tops go through a treat. As I'm only dealing with two or three trees per session it has seemed reasonable if a bit laborious to persist with this, and we've made some gratifyingly large heaps of mulch with it.
    It is rated at 2kw but in general the electric motors on them only use as much power as they need to maintain their speed. When there's nothing much going through, little power is used, 450w on mine.
    Jules, I don't know the answer to your real question but I do know that CO2 is not the only greenhouse gas, and that many of the vapours in incompletely burnt woodsmoke are thought to be carcinogens. I think I'd go for the fast burn myself.

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