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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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    • CommentAuthorgyrogear
    • CommentTimeJul 31st 2018 edited
    I just came across a thought-provoking comment in another thread, which I'd prefer not to hijack, viz:


    "(...) maybe with some freezer blocks or bottles of salty water to act as stores of cold?"

    This bought my eye, as I am currently configuring my crawlspace as a solar-thermal heat store (using warm air...).
    The essential part of the storage will be the concrete structure and (hopefully) the ground. In addition I intend to use a couple of 1000-liter static water batteries (plastic dustbins filled with water).

    I have apparently ingested the fact that a tonne of water through one kelvin represents 1.16 kWh of storage capacity.

    I am now wondering whether the water ought, in fact to be BRINE - cannot seem to find any info about specific heat of brine via web searches, and my O-level physics was several decades ago...

    In addition I have planned for a third storage comprising a 3x3 matrix of nine 240-liter tanks (wheely bins) buried up to their shoulders, the central bin being circulated through a PEX HEX comprising 75 meters of tube inside a hot-air tunnel. The idea being to inject heat into soil... The question is, if BRINE is OK for static storage, would it be OK in a circulated system, or would it corrode the circulator?

    Any assistance much appreciated as usual !

    Hi gg, I suggested that Damon should use brine to store cold in his freezer because it melts and freezes at a low temperature so will keep the food frozen without using much space or being toxic. This uses latent heat of freezing/melting.

    If you want to store heat, you ideally want a cheap substance that melts and freezes at a nice warm room temperature. Unfortunately there aren't many common substances that fit that bill, so you may be better just using a lot of water.
    • CommentAuthorgyrogear
    • CommentTimeJul 31st 2018
    Thanks, Will, I think I get the picture - change of phase ?

    Now : where to get hold of a few tons of candlefat going cheap !
    Or maybe try my local abattoir :shocked:

    • CommentAuthortony
    • CommentTimeJul 31st 2018
    Water would be better, cheaper, non corrosive,
    • CommentAuthorgyrogear
    • CommentTimeJul 31st 2018 edited
    Thanks, Tony, I shall look no further !

    (and just get on with the dig instead... )

    • CommentAuthortony
    • CommentTimeJul 31st 2018
    I use water in my solar thermal/inter seasonal store with electronic frost proofing now OK for nine years
    • CommentAuthorgyrogear
    • CommentTimeJul 31st 2018
    Thank you, that is good 2No :cool:

    If mine works as well as yours, I'll be a well happy lad !

    • CommentTimeJul 31st 2018

    Also magnetite (see later).

    But note Sunamp's 3x-denser-than-water phase-change storage, commercially available now.


    • CommentAuthorgyrogear
    • CommentTimeAug 1st 2018
    Hmm, thanks for the ideas !

    However, I doubt a milk tanker would fit inside my crawlspace, and as for 15 tonnes of magnetite, it would take a very long bucket-chain not to mention several weekends :surprised:

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