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Thread: Thermal mass as temperature control

  1. #17
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    there's loads of winter crops that don't need heat, though. And it's far easier than creating elaborate warming devices
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  2. #18
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    veggiechicken is online now Gardening Guru
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  3. #19
    Jwood0123 is offline Germinator
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    Seems like the general consensus is that there is little benefit to GH heating, especially based on the poll veggiechicken linked. I'll probably still make the ground a dark colour to help heat absorption, but just not bother with anything complicated.

    I'll look into what winter crops i want to grow once im set up.

    Thanks guys

  4. #20
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    There's nothing wrong with trying, loads of gardeners provide extra heat early in the growing season.
    There's a fellow in yorkshire call Jack First, google him, he runs courses in hotbeds and has a fantastic hotbed setup, he's even written a book.
    Good luck, keep it posted what you do, it's really interesting
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  5. #21
    Jwood0123 is offline Germinator
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    Quote Originally Posted by MyWifesBrassicas View Post
    There's nothing wrong with trying, loads of gardeners provide extra heat early in the growing season.
    There's a fellow in yorkshire call Jack First, google him, he runs courses in hotbeds and has a fantastic hotbed setup, he's even written a book.
    Good luck, keep it posted what you do, it's really interesting
    I just had a little bit of a look into the hotbed system. I might give it a go as i have the materials to make a sort of "coffin" below the walkway inside the greenhouse. while it wouldn't be directly below any growing space, it will be in the centre so it may still work. Other than that, I personally wouldn't be keen on doing it directly under grow space - i imagine it being too much hassle and one of the main crops im growing are strawberries (which i hope will survive winter) so they would get in the way.

    Thanks for the suggestion, do you think the system i have mentioned would work? it would be 2 layers of approx. 20mm thick fibreglass plywood floor. hopefully insulating it so that the heat gets slightly dispersed towards the grow spaces that surround it. the "coffin" itself would probably be around 1.5mtrs long and 1/2 a mtr deep and wide. My main concern with this method would be the smell from anaerobic activity.

  6. #22
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    Quote Originally Posted by Jwood0123 View Post
    I just had a little bit of a look into the hotbed system. I might give it a go as i have the materials to make a sort of "coffin" below the walkway inside the greenhouse. while it wouldn't be directly below any growing space, it will be in the centre so it may still work. Other than that, I personally wouldn't be keen on doing it directly under grow space - i imagine it being too much hassle and one of the main crops im growing are strawberries (which i hope will survive winter) so they would get in the way.

    Thanks for the suggestion, do you think the system i have mentioned would work? it would be 2 layers of approx. 20mm thick fibreglass plywood floor. hopefully insulating it so that the heat gets slightly dispersed towards the grow spaces that surround it. the "coffin" itself would probably be around 1.5mtrs long and 1/2 a mtr deep and wide. My main concern with this method would be the smell from anaerobic activity.
    Give it a go, it's worth a shot.
    Not sure how much heat it'll produce and for how long, anaerobic activity is colder than aerobic.
    I think the french hotbeds were about 1-2 ft underground, but built up so that it was above ground by another ft or so, making it about 3ft deep, they were very successful

  7. #23
    Jwood0123 is offline Germinator
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    Il look into it in further detail once I get around to building the storage space in my GH. Even if it doesn't help heat the GH, you can never have too much compost. Thanks again for your help.
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  8. #24
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    Quote Originally Posted by Jwood0123 View Post
    Il look into it in further detail once I get around to building the storage space in my GH. Even if it doesn't help heat the GH, you can never have too much compost. Thanks again for your help.
    When you've done it, post a picture.
    Always exciting to see, especially if there's a compost thermometer in there giving a warm reading

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