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

Robyn Francis erda at nor.com.au
Sat Jun 16 02:56:05 EDT 2007


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


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

> 
> 
> 
> On 16/6/07 1:02 PM, "jedd" <jedd at 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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