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Thread: Thermal mass as temperature control

  1. #9
    Mark_Riga is offline Tuber
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    The same principle can be used for individual plants. e.g. If a series of cold nights are threatened in spring and your courgettes are out then putting a couple of 4pint milk bottles full of water either side and covering them with fleece/polythene/newspaper can protect them.

  2. #10
    Jwood0123 is offline Germinator
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    Quote Originally Posted by veggiechicken View Post
    How big is your GH?
    Its only 2mtr x 2mtr, it has a good position for catching sunlight though so I think I can use almost all of the space inside effectively. I have considered using water containers underground, although this would only be marginally better at regulating temp compared to soil, and I will need to make the floor dark to improve the rate of heat absorption (plus the added bonus of less sun scorch on plants maybe?)

    As this is all theoretical though, I haven't got much clue on how well it will work.

    P.S thanks for the link to the other thread, il have a look now.
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  3. #11
    Jwood0123 is offline Germinator
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    Quote Originally Posted by MyWifesBrassicas View Post
    Hi,

    Back in the 50's and 60's, Jean Pain did this through composting wood chips.
    He create a complete heating system of self sufficiency, this heated his home and all the hot water he needed to 60C
    Of course he used tons of woodchips, but this can be down scaled to heat a greenhouse, thinking of trying this very principal to slightly raise the temp of my greenhouse over winter.
    The woodchip build is outside my greenhouse with a piping system providing heat to the greenhouse, just not too sure which system to use to pump the heat (no power supply at the allotment)
    This also gives me a great supply of compost.
    This may actually be a possibility for me, I have my compost bin directly behind the greenhouse. Once I have managed to sustain a decent compost temp, I may be able to feed a pipe from the bin into the greenhouse. even if it doesn't last all the way into winter, I imagine it could still extend the growing period.
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  4. #12
    veggiechicken's Avatar
    veggiechicken is online now Warning, May contain nuts
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    To be honest with you, I think you'd do better to concentrate on growing winter hardy crops in your GH than giving up valuable space to water containers that may not make much difference to the temperature.
    A Chicken walks with small steps. Be more Chicken
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    Quote Originally Posted by Jwood0123 View Post
    This may actually be a possibility for me, I have my compost bin directly behind the greenhouse. Once I have managed to sustain a decent compost temp, I may be able to feed a pipe from the bin into the greenhouse. even if it doesn't last all the way into winter, I imagine it could still extend the growing period.
    I've been composting a large pile of wood chips since Dec 18 and it's only just started to cool down.
    Stayed at around 60C for the majority of that time, it's now 40C, that's 9 months of heat.
    However, if what i use to store the heat, say water barrels in the greenhouse, then loosing space for valuable winter growing is a little counter productive just as VC say's.
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  6. #14
    Jwood0123 is offline Germinator
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    Quote Originally Posted by veggiechicken View Post
    To be honest with you, I think you'd do better to concentrate on growing winter hardy crops in your GH than giving up valuable space to water containers that may not make much difference to the temperature.
    I think I probably will. But while I'm still designing my greenhouse layout, if I can figure out a way to stabilise temperature without sacrificing too much grow space, I'm hoping it'll help even with winter crops anyway.

  7. #15
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    Line it with bubblewrap - doesn't take up any growing space. I used to do it when I first had a GH and thought I should try to keep the temperature up if possible.................Now I have 5 GHs and just grow whatever I can with whatever the temperature may be.
    A Chicken walks with small steps. Be more Chicken
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  8. #16
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    Quote Originally Posted by Jwood0123 View Post
    I think I probably will. But while I'm still designing my greenhouse layout, if I can figure out a way to stabilise temperature without sacrificing too much grow space, I'm hoping it'll help even with winter crops anyway.
    I'm not overly convinced there's much to gain extending the growing season at the end of the year as there's a reduction in light, however I think it's more beneficial feb onwards as the light levels are increasing.
    Maybe others here may have differing thoughts?
    I did play with the idea of using the composting system outside the green house to heat a "propagator mat" as opposed to heating the whole greenhouse. I've assumed it's easier to heat a propagator than the whole greenhouse
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