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October 16, 2006

Comments

g bruno

Some of the highest plant growth in seen in pinus radiata tree growth
20-50m³/ha/yr = 14-35T/ha/yr = 1.4 -3.5 kg/m²/yr = 19 - 48MJ/m²/yr
(1 kg of Fuelwood = 13.8 Mj ) I oven dried tonne of wood = 16xlO9 joules
if solar = 300-700Watts for 6 hours/day/m² = 750-1,500 KwH = 2.7-5.5E3MJ/m²/yr
so efficiency ranges from 19*100/5.5E3 = 0.35% Low to 48*100/2.7E3 1.8%high
this doesnt include energy in cutting, drying, chipping, transporting

G Eddy

It would be helpful if g bruno would translate his post, above, into the English, so we could all understand what he is saying.

Harvey D.

I may be wrong, but it seems that:

1) Wood from Pinus radiata trees could produce an average (gross) 33 MJ/M2/Yr. Net energy production may be much less or as little as 4 times less or about 8 MJ/M2/Yr.

2) High performance sun panels can produce an average of 4.1 MJ/M2/Yr

Why bother with trees using (good land + hard work + transformation pollution) when clean power could be provided with sun cells on about twice the (useless desert land) area.

Economical/practical large scale sun energy storage remains to be solved. Energy production diversity + time zones + decentralized storage could help.

George

The solar cells produce electricity, a very high quality of energy. It can be converted into either motion or heat with little loss. The energy of biomass is presumably based on the heat produced from oxidation. So not only do you have polluting combustion byproducts to worry about, but if you want to convert that heat to motion you will suffer the Carnot inefficiency of a heat engine. I am in agreement with Harvey D.

A bit more on topic, does anyone know what these panels cost? 22% isn't that big of a deal on top of a building if it costs 3 times as much as 11%... On top of a car might be a different story.

Seg

The new SPR-315 solar panel is planned for commercial availability in the Spring of 2007.

No pricing yet.

Engineer-Poet

Just as long as you recognize that wood is storable energy and (on the relevant time scales) PV might as well not be, the two are not direct competitors.  But the efficiency argument is well-considered.

Kudos to Harvey D. for the excellent translation.

TObject

world's highest efficiency?
is that a freaking joke?

Spectrolab's cells(i.e. Mars rovers) are close to 40% efficiency and available NOW

Ronald Brak

Spectrolab produces solar cells of very high efficiency, but they are very expensive and I don't think they produce flat panels for intended for household use. I think they have produced a solar concentrator, but that's quite different from a flat panel.

Engineer-Poet

World's highest efficiency for polycrystalline silicon cells, if you actually care about the distinction.

solar

Cool!China solar cell silicone

galit shafir

Dear sr.

I'm a reporter at the "Calcalist" newspaper in Israel, the new economic section of "Yedioth Acharonot", which us the largest newspaper in Israel.

Lately I've started to work on an item about the issue of ecologic construction, or in another words – who to build a "green house". For this item I would like to use photos from your's lovely site – if you'll give your permeation.

galith-s@yedioth.co.ilyou can reach me in the e-mail address

Or in my cellular phone: 972-52-4004029

Thank you very much

Galit Shafir


Robert D Crago

DOES SUNPOWER PROVIDE A MORE PORTABLE PANEL OR SOLAR SYSTEM THAT WOULD FIT THE RV MOTORHOME MARKET? CAN A PERSON BUY PANELS ALONE FROM THEM WITH AN EFF. RATING OF 40%? DOES SUNPOWER HAVE A SPECIALIZED CONTROLLER AND INVERTER THAT MATCHES THE PANEL SPECIFICATIONS? IF SO, THEN CAN ONE BUY A SOLAR SYSTEM FOR AN RV AT 150 TO 250 WATTS POWERING A 3000+W INVERTER?

BOB

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Along with light, the Sun radiates a continuous stream of charged particles(a plasma) known as the solar wind. This stream of particles spreads outwards at roughly 1.5 million kilometres per hour, creating a tenuous atmosphere(the heliosphere) that permeates the Solar System out to at least 100 AU. This is known as the interplanetary medium. Geomagnetic storms on the Sun's surface, such as solar flares and coronal mass ejections, disturb the heliosphere, creating space weather. The largest structure within the heliosphere is the heliospheric current sheet, a spiral form created by the actions of the Sun's rotating magnetic field on the interplanetary medium.

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energy resources are very few,so these steps are useful to save energy and to make world clean and green..............

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This story was so real that these "characters" gave me great insight and a lot to ponder.

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Yes, There are limited source of energy available for us at this time so solar energy is important for us.I have some information related with this. For This is a hard question to answer exactly because there are a lot of variables. However, here is one way to think about it: If you were to use an acre of ground to raise corn, and you then turned that corn into ethanol (alcohol), you could get a measurement of the energy that an acre of plants can capture from the sun. Then you compare that number with solar cells.

carol

The largest structure within the heliosphere is the heliospheric current sheet, a spiral form created by the actions of the Sun's rotating magnetic field on the interplanetary medium..
***************************
carol
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solar panel

this blog is very informative and learning resource about solar panels.keep it up.

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JHON

Lately I've started to work on an item about the issue of ecologic construction, or in another words – who to build a "green house". For this item I would like to use photos from your's lovely site – if you'll give your permeation.Motorhome Insurance

make solar panels

Solar panel system are great subject to learn, Great way to produce huge electricity and save the earn, nice post, thanks

solar panel

They are very expensive, and I do not think they are making flat-panel displays and for domestic use. I think they produced a solar concentrator, but it is very different from the plate.

solar panels

Energy resources are becoming few every year. Its good to have modern and economical ways of generating electricity at a minimum cost. People should be learning these steps that are useful to save energy and make the world clean and green!

Online wholesale products

The thing is, energy sources aren't really becoming fewer, the ideas for energy are. We have so many resources that can be used for alternative energy.

 solar panels

Solar still has a few years at the current rate of growth prior to storage becomes an important issue. If one or more of the seemingly wild claims I've seen it happen which could end up with a lot of money, but time-varying power.

plumbing

This is a good development. However, cost is a major consideration here. With that increase of efficiency rate the cost will might as well increase. People will be troubled with the additional investment they will pay.

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The new SPR-315 solar panel enables our customers to generate more power with fewer panels - maximizing energy production while reducing installation cost.
_______________
Mary

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