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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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    • CommentAuthorSprocket
    • CommentTimeApr 24th 2013
    ... for a few of these?


    Though, am I missing something?
    Don't you think they sound a bit big for 25kW?

    25kW of regular 20% efficient PV isn't all that large.

    So with micro-fluidic cooling and 80% efficient triple-junction PV cells I would expect to get 25kW from something more like the size of a suitcase.
    • CommentTimeApr 24th 2013
    May be waiting a while for a clear day. You ever seen St. Just?
    • CommentAuthorEd Davies
    • CommentTimeApr 24th 2013
    Yes, sounds about the same efficiency as normal PV. Only advantage I can see is that it's probably lighter if you want to make the thing track. Can't imagine the costs are much different.
    • CommentTimeApr 24th 2013
    I think the cost is the whole point, isn't it? It uses a lot less actual PV cell area than regular panels and the rest is mirrors so it should be possible to make it a lot cheaper. And it collects the waste heat as an extra income stream.
    • CommentAuthorEd Davies
    • CommentTimeApr 24th 2013
    Dunno, never built one but a steerable 50 foot dish for less than, say, £40k (guesstimated installed cost of a bit more than 25 kW of ground-mounted PV)?
    • CommentAuthorjms452
    • CommentTimeApr 24th 2013
    80% = 30% electrical and 50% thermal

    'the cost of commercial dishes should drop to about $250 per square meter--three-times lower that existing photovoltaic concentrators today, according to IBM.'

    Compared to basic silicon PV at ~$150/m2 @15% this is slightly cheaper and you get the heat for free!
    • CommentAuthorchuckey
    • CommentTimeApr 24th 2013
    "of high-concentration photovoltaic cells by as much as 10-times by using micro-fluidic water" . So 10 X 20% = 200% efficiency?
    So water cooled PV, so thats a pump, super pure water +anti freeze, heat exchanger - Do I need more heat in the summer? or some other way of keeping the cooling water cool. Not going to be used in the home, never. I doubt if it will be used in this country except for a few very specialized areas - Tomato growing in Guernsey? Might be some other spin offs from this project that could be useful.
    • CommentAuthorEd Davies
    • CommentTimeApr 24th 2013
    Posted By: chuckey"of high-concentration photovoltaic cells by as much as 10-times by using micro-fluidic water" . So 10 X 20% = 200% efficiency?
    No, 10 times the output. Since the input is increased (by an only vaguely specified amount from 300 to 500 up to 2000 to 5000 concentration) by using a bigger dish or focusing the light more tightly the change in efficiency, if any, is also not specified.
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