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permaculture - Re: [permaculture] Infeasible power fantasies (Was: Energy-EnergyPolicy-Bioregional Design-The Sustainability of Biofuels.US.FL)

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  • From: Robyn Francis <erda@nor.com.au>
  • To: permaculture <permaculture@lists.ibiblio.org>
  • Subject: Re: [permaculture] Infeasible power fantasies (Was: Energy-EnergyPolicy-Bioregional Design-The Sustainability of Biofuels.US.FL)
  • Date: Sat, 16 Jun 2007 16:56:05 +1000

Oops, last line should read peak daily at 2-3am, not pm.
Robyn


On 16/6/07 4:31 PM, "Robyn Francis" <erda@nor.com.au> wrote:

>
>
>
> On 16/6/07 1:02 PM, "jedd" <jedd@progsoc.org> wrote:
>
>> On Sat, 16 Jun 2007, Robyn Francis wrote:
>>> Solar Voltaics are only one means of solar power generation. Many of the
>>> new solar thermal systems actually peak at 2am so the issue and some store
>>> heat to generate energy for several days. The only issue then is backup
>>> for
>>> extended cloudy wet periods.
>>
>> Hi Robyn,
>>
>> Are these the things that look like a black corrugated iron roof,
>> and that get stupidly hot in even the mildest heat .. ? I've seen
>> these, and am expect I'll head down that path for my own hot
>> water system. Do you have some pointers to manufacturer or retail
>> pages of the 2am-peak style systems that you're referring to?
>
> Jedd, you need to think beyond the isolated individual household systems. At
> that scale currently solar voltaics are pretty-much all that's on offer.
> However there's a lot of innovation happening with solar thermal systems and
> most of these operate on a larger scale to power from 20 up to 200,000
> households. Many of these employ parabolic reflectors. Some store heat
> overnight using various liquids.
>
> Some of these could be installed on flat rooftops in innercity areas and
> industrial estates or even over roofed carparks. Other prototypes have been
> set up on farmland with no disturbance to livestock free-range grazing
> underneath.
>
> You might like to check out
> http://en.wikipedia.org/wiki/Solar_thermal_energy just to see how a few
> solarthermal power generation systems work. I've seen other
> systems/variations in documentaries and various science & technology
> articles.
>
> There's also the solarthermal power station being built in Western NSW with
> a big glasshouse covering hectares of land. The hot air accumulating under
> the glass feeds convectively through a huge tower in the centre driving a
> turbine. This system also is expected to peak daily at 2-3pm.
>
> Ciao
> Robyn
>
>
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