Showing posts with label Fuel Cells. Show all posts
Showing posts with label Fuel Cells. Show all posts

The lost history of biofuels

It's surprising that the history of something as important as renewable energy in general, and biofuels in particular, would be so little known. If you read current historical works on energy, there is no mention of ethanol or other biofuels. The Prize or most other histories of the energy have little or no mention of alternatives.

Its like we have a history of Rock and Roll with the Beatles but not the Stones. Or of aviation with the Wrights but not Curtis. Or of dance with Fred but without Ginger.

Before we open a narrative on the history of renewable energy and biofuels and the people who fought for their recognition, we might take a minute to think about history itself.

Thucydides (460 - 400 BC) once said: "The way that most men deal with traditions, even traditions of their own country, is to receive them all alike as they are delivered, without applying any critical test whatever..."

Plenthy of material

To ignore alcohol as a fuel entirely in the history of energy certainly seems fishy. There is plenty of raw material to go on. For example:

  • At least 152 popular and scholarly articles under the heading "Alcohol as a Fuel" can be found the the Readers Guide to Periodical Literature between 1900 and 1921.
  • About 20 references to papers and books written before 1925 are found in the Library of Congress database catalog; a 1933 Chemical Foundation report lists 52 references before 1925 on alcohol fuels. A1944 Senate report lists 24 USDA publications on alcohol fuels before 1920. Technical books from the period document hundreds of additional references .
  • The New York Times database returns 408 results for alcohol and fuel in the 1900 to 1925 time period and 602 in the next 25 years. In the 1951-1975 period the number drops off to 268. But the last quarter of the 20th century, 645 articles are found.

Why? We could chalk it up to several things, including these:

Roads not taken. Historians love to tell stories about success and heroism. Writing about "failures" -- even failures that may later prove useful -- is rarely done.

Women's history. Many of the people who were most vocal on issues like air pollution and the need to put public health ahead of corporate profit were ignored by traditional historians precisely because of their gender.

Industrial history. Historians who have written histories of businesses or of great enterprises are often the recipients of generous grants and cooperation from the industries about which they are writing.

Why its important now

We are only about two centuries into the industrial revolution, we often forget that renewable energy was the only energy source for most of human history.

We can appreciate the history of renewable energy as part of our "useable past." There are lessons here about roads not taken. In terms of social context, we need to understand the history of renewable energy as part of our tradition of reform.

Most importantly, renewable systems are flexible and rapidly scalable. Massive outputs of ethanol or butanol or other biofuels, in the range of billions of gallons, could be scaled up within a matter of months or a few short years. Coal and petroleum bases systems take much longer to build, as we learned in World War II.

Renewable energy sources tend to be more expensive, it's true.

Unlike fossil energy from coal or oil, or nuclear energy from uranium, renewable energy is dispersed, decentralized and more difficult to collect and concentrate.

Solar, wind and hydro power have no fuel costs, but have much higher capital costs that have to be covered initially. Fossil energy, on the other hand, has been economically more attractive even when renewables cost the same because fossil energy fuel costs are spread out over the life of the power generating plant.

Traditional economics have put renewables at a disadvantage for other reasons as well:

    External environmental costs of fossil fuels and nuclear power have been imposed on populations, especially weaker segments

    The costs of resource extraction from politically unstable foreign lands have been placed on taxpayers through bloated military establishments.

    And so the true cost of oil, by one estimate, is between $5.60 and $15.14 a gallon.

    Another cost is political. For instance, America's oil habit certainly helped turn U.S. citizens into targets of choice (Washington Post, 2001)

US government policy signals about energy have been unrealistic and totally unreliable.

But the question is, really: Can renewable technology ever be cheap enough, and provide enough power, to avert catastrophe?

Learning the lessons of the past as a guide to the future, as Thucydides said, is the point of studying history

NEXT: Renewable energy history categories

SunPower increasing solar cell capacity by 150 percent in 2008

In announcing financial results for the first quarter of 2008, SunPower Corporation stated that it would be increasing solar cell capacity by 150 percent in 2008, compared to capacity levels in 2007. The company also said that nearly half of its cell production was its ‘Gen2’ solar cell technology that has a minimum conversion efficiency of 22 percent.

“Our proprietary technology delivers the highest output per unit area of any commercially available solar system and we intend to leverage this technology by aggressively expanding our solar cell production by more than 150 percent in 2008 compared to 2007,” commented Tom Werner, SunPower's CEO, in a financial statement. “This scale, combined with lower silicon costs, higher efficiencies, thinner wafers and on-going quality and cost improvements in our factories, will drive unit cost reduction. During the first quarter of 2008, we continued to meet or exceed our manufacturing targets across both of our fabs and our panel manufacturing facility.”

The company also noted that it has secured 100 percent of its required polysilicon supply through 2010 to meet its revised capacity expansion plans. Last year, SunPower projected that production would top 250MW in 2008. However, revised figures revealed by the company show that figure to be 255MW for 2008.

The same is true for 2009. SunPower previously stated that it would produce 430MW in 2009; that figure has been raised to 450MW-plus. For 2010, the company is still expecting production of 650MW-plus, but has not adjusted the baseline figure upwards.

SunPower also reiterated that its capacity ramp at Fab 2 remained on schedule and was expected to be completed by the end of 2009. Its fourth solar panel manufacturing line had also completed its production ramp allowing the company to produce more than half of its PV panels in-house.

SunPower

Biofuels emissions may be 'worse than petrol'


Biofuels, once seen as a useful way of combating climate change, could actually increase greenhouse gas emissions, say two major new studies.

And it may take tens or hundreds of years to pay back the "carbon debt" accrued by growing biofuels in the first place, say researchers. The calculations join a growing list of studies questioning whether switching to biofuels really will help combat climate change.

Biofuel production has accelerated over the last 5 years, spurred in part by a US drive to produce corn-derived ethanol as an alternative to petrol.

See more

FUEL CELLS

Fuel cells, which can convert chemical energy directly into electricity, have been proposed as a replacement for other methods of generating power from fossil fuels for 100 years. Till recently there have been numerous difficulties in commercializing them however. Will these problems be overcome in the new century? If the problems can be overcome, fuel cells will likely be the favored technology of the future for all CHP as well as large centralized powerplants. Not only do fuel cells produce reasonable efficiencies at the smaller sizes, they will likely be able to run quietly, need infrequent maintenance and emit little pollution.
A fuel cell works similar to a battery. In a battery, electricity is generated as a result of a fixed amount of substance undergoing a chemical change inside the cell. In a fuel cell, a continuous flow of chemical substance flows through the cell and is made into electricity. While a battery has a limited amount of electricity it can produce per cycle, a fuel cell can produce electricity as long as more fuel is pumped through it.
Solid oxide fuel cells will likely be the favored fuel cell for CHP [2]. Small solid oxide fuel cells will be about 50% fuel to electricity efficient, medium powerplants 60% efficient, and large one's up to 70% efficient. Their efficiency is good from about 15%-100% power. Most solid oxide fuel cells utilize both hydrogen and carbon monoxide fuel inside the cell. This means that they can readily operate on hydrocarbon fuels such as coal gas, gasoline, diesel fuel, jet fuel, alcohol, and natural gas. The efficiency of the solid oxide fuel cell used in CHP applications will be higher than the polymer electrolyte fuel cells for two major reasons. The first reason is that the hydrocarbon fuel is reformed into hydrogen and carbon monoxide fuel largely inside the solid oxide fuel cell. This results in some of the high temperature waste thermal energy being recycled back into the fuel. The second reason is that air compression is not required. Especially on smaller systems, this results in a higher amount of net electricity being produced and quieter operation.
Most polymer electrolyte fuel cells that are being developed for automobiles and CHP use hydrogen gas as a fuel. It is not likely that we will have hydrogen pipelines supplying homes and businesses in the near future. This means that hydrogen will often be extracted from hydrocarbon fuels in CHP systems. Because the polymer electrolyte fuel cell operates at a low temperature, there is no waste thermal energy recycling in the reformer. Air compression to about 3 atmospheres or higher must be used to have a reasonable power density [3]. On small systems this results in a substantial loss of efficiency. Small polymer electrolyte fuel cells will be about 35% fuel to electricity efficient, medium powerplants 40% efficient, and large one's up to 45% efficient.
Because of the high temperatures that the solid oxide fuel cell must run , they may not be practical for sizes much below 1,000 watts or when portable applications are involved. Several companies in the world are presently working on direct alcohol fuel cells. In this type of fuel cell, the alcohol is not reformed but used directly in a very simple type of fuel cell. This fuel cell is ideal for portable equipment such as power tools, laptop computers, portable phones, and emergency generators. For more information on fuel cells read the web-booklet "The Future of Fuel Cells"