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'[TECH] Solar Fuel Machine (for hydrogen) and Cree '
2010\12\24@031335
by
cdb
According to the BBC website a Swiss university has produced a prototype solar machine that uses cerium oxide as a catalyst to provide oxygen as the cerium cools down during the night. The prototype production is pathetic at 0.7 -> 0.8% efficiency, they hope to increase it to 19% which they think would be marvellous (I think that still sounds pretty poor).
<http://www.bbc.co.uk/news/science-environment-12051167>
Elektor report that Cree have announced their CXA20 LED array which produces 1K lumens at 11 watts (I haven't read the whole article, so assume this is input power).
<www.elektor.com/news/led-array-delivers-record-1050-lumens-at-11-wa
tts.1649039.lynkx?utm_source=UK&utm_medium=email&utm_campaign=news>
Colin
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cdb, 3/07/2009
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spam_OUTcolinTakeThisOuT
btech-online.co.uk
2010\12\24@042205
by
RussellMc
> According to the BBC website a Swiss university has produced a prototype
> solar machine that uses cerium oxide as a catalyst to provide oxygen as the
> cerium cools down during the night. The prototype production is pathetic at
> 0.7 -> 0.8% efficiency, they hope to increase it to 19% which they think
> would be marvellous (I think that still sounds pretty poor).
19% is above what you can typically buy Si PV at at present.
Higher exists.
Max theoretical Si single junction is about 28% afair.
Whether 1% is useful depends greatly on cost per area.
As a parallel example eg if you had a solar PV cloth which was about
free and which could be attached to house roofs for about free then at
1% a 1000 ft^2 roof would make about 100W.
Not very useful by most standards. But very much so in some circumstances.
> <http://www.bbc.co.uk/news/science-environment-12051167>
> Elektor report that Cree have announced their CXA20 LED array which
> produces 1K lumens at 11 watts (I haven't read the whole article, so assume
> this is input power).
>
> <www.elektor.com/news/led-array-delivers-record-1050-lumens-at-11-wa
> tts.1649039.lynkx?utm_source=UK&utm_medium=email&utm_campaign=news>
LED sounds good, but
Cree do better than that already.
XLamp ML-E guarantees 1000 lumen at 10 Watt.
Better l/W at lower W
2010\12\24@050411
by
Michael Watterson
On 24/12/2010 08:13, cdb wrote:
> According to the BBC website a Swiss university has produced a prototype
> solar machine that uses cerium oxide as a catalyst to provide oxygen as the
> cerium cools down during the night. The prototype production is pathetic at
> 0.7 -> 0.8% efficiency, they hope to increase it to 19% which they think
> would be marvellous (I think that still sounds pretty poor).
19% is good compared to PV cells, maybe poor compared to water heating panels
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