SUNNYVALE, Calif. — As a scientist working for NASA in the 1990s, K. R. Sridhar developed a contraption that could use energy from the sun to transform the elements of the Martian atmosphere into breathable air or propulsion fuel.

It passed all its tests, but a planned mission to send it to Mars in 2001 was canceled and Dr. Sridhar moved on, looking to apply what he had learned to help stem climate change on earth instead.

“I came full circle — I was trying to make a really uninhabitable planet habitable,” Dr. Sridhar, 56, said recently, holding a black-domed prototype of the shelved device at his Silicon Valley office. “I was thinking, ‘I can do something to make this planet a little more sustainable.’ ”

Almost two decades later, that thought has led to a fleet of fuel-cell generators that produce electricity through a chemical reaction. And with a recent deal for Dr. Sridhar’s company, Bloom Energy, to install generators at a dozen data centers in California and New Jersey for Equinix, a leading operator, it is poised for a major expansion.

The aim of the deal, financed by a subsidiary of a deep-pocketed electric utility, Southern Company, is not only to create a reliable energy source for a power-thirsty industry, but also to help validate a technology that has struggled to gain mainstream acceptance.

What is striking is that the fuel cells are not running on hydrogen, like the ones long seen as a promising power source for cars. Instead, they use natural gas, which has become plentiful after a production boom over the last decade.

Even though they consume fossil fuels, the gas-powered cells have attracted the attention of some environment-minded policymakers, investors and entrepreneurs because they release less of the heat-trapping gases like carbon dioxide than conventional plants. And they have been slowly finding fans among energy-conscious corporations — in Walmart stores, eBay data centers and Morgan Stanley’s corporate headquarters.

Scott Samuelsen, director of the National Fuel Cell Research Center at the University of California, Irvine, said data centers could become an important market for fuel cells because the industry “appears to want to be more environmentally sensitive but more reliant on their own resources.”

Part of the environmental appeal lies in their efficiency. Fuel cells are generally installed on site, so they do not need to burn extra fuel to compensate for energy lost over long transmission lines. In addition, they use less fuel per watt of power than conventional plants because they don’t

burn fuels to heat water or air to spin turbines.

That also makes them quiet, which has proved a surprising barrier to their acceptance among potential customers, Professor Samuelsen said. “It’s hard for anyone to believe that they’re making any power,” he said. “It’s not like a jet engine.”

The innovations at Bloom stem from Dr. Sridhar’s work on NASA’s Mars exploration program when he was director of the Space Technologies Laboratory at the University of Arizona. Trained as a mechanical engineer in his native India, Dr. Sridhar arrived at the lab after getting a doctorate at the University of Illinois.

On the Mars project, he focused on using electricity to fuel chemical reactions among elements found on the Red Planet, even creating dirt capable of germinating a seed. Figuring that he should be able to reverse the process, he founded Bloom and worked on converting chemical energy to electricity using readily available fuels and conductors.

Eventually, he and his team hit upon a version of the current design of roughly 5-inch-square fuel cells fused together in stacks — each about the size of a half-loaf of bread and capable of powering an average home. The stacks are loaded into tubular metal casings before being enclosed in banks about the size of a refrigerator that can then be arrayed on the ground or a roof to run large facilities.

The equipment, produced at the company headquarters here with final assembly at a factory in Delaware, is simultaneously high- and low-tech. Each cell is made from a thin ceramic wafer that is mainly zirconia — a relative of the diamond substitute. In a process reminiscent of high school art class, the wafers are screen printed with chemical inks on each side in an automated sequence and then fired in kilns. They are sandwiched between metal plates, and the resulting structure is a solid oxide fuel cell that can operate at very high temperatures, about 800 degrees Celsius, or 1,472 degrees Fahrenheit.

At that temperature, when natural gas mixed with steam flows over one surface of the cell while oxygen flows over the other, a reaction results in the release of electricity, steam that is recycled through the process and carbon dioxide.

Equinix tested the Bloom cells at a data center in San Jose for 18 months before committing to the current arrangement, in which it will buy the energy under a 15-year power purchase agreement. The company, which runs more than 185 data centers on five continents, serves as a kind of cloud and network broker. It builds and operates facilities that provide space, power and cooling as well as work rooms, showers and a security system featuring a series of locked chambers like something out of “Get Smart.” The client companies bring their own servers and other hardware to plug into more than 1,000 networks that connect them to customers and to each other.

The Southern Company, based in Atlanta, comes into the partnership because it has unregulated businesses that sell power nationwide. In this case, Southern buys the fuel-cell generators from Bloom and then, through a subsidiary called PowerSecure, sells the output to Equinix under a 15-year agreement.

The Bloom deal with Equinix and Southern is among the largest ever for a fuel-cell business, but Bloom faces competition from other providers, like Fuel Cell Energy, which is based in Danbury, Conn., and has a partnership with Exxon Mobil. It has won a number of recent contracts, which include installing and operating three fuel-cell projects for the Long Island Power Authority and one that will supply power for the Navy submarine base in Groton, Conn.

Indeed, the United States government has had a hand in the technology’s development through grant programs at the Energy Department and a federal tax credit that expired at the end of last year.

The natural-gas fuel cells provide some environmental advantages over traditional power plants that run on fossil fuels: They use little water and release almost no harmful smog emissions. The Bloom cells can also run on biogas or hydrogen, which would make them even more environmentally friendly, given a steady supply of those fuels.

The usefulness of natural-gas fuel cells in reducing greenhouse gas emissions is a matter of some debate, however. Some environmentalists and public-utility officials say the fuel cells’ emissions may be understated and question whether their carbon reductions are sufficient to warrant public subsidies.

Still, their emissions are well below the average for coal-fired plants. Bloom puts the emissions of its natural-gas cells in the range of 679 to 833 pounds of carbon dioxide per megawatt-hour, while coal plants released 2,252 pounds of carbon dioxide per megawatt-hour in the second quarter of this year, according to the Power Sector Carbon Index, an analysis published by the Scott Institute for Energy Innovation at Carnegie Mellon University. They are much closer to those of natural-gas plants, which, according to the index, averaged 938 pounds per megawatt-hour during the same period.

Though companies looking to power energy-hungry data centers have often sought out hydroelectric power, which does not depend on fossil fuels and is generally inexpensive, fuel-cell technology is gaining traction, especially for customers who need an extremely steady power supply even during storms. For Tom Fanning, chief executive of Southern Company, the partnership with Bloom is part of a bid to take advantage of the technological advances that are upending the electric industry by allowing customers to make their own power, known as distributed generation.

“For 100 years, we have had a business model predicated on the notion of making, moving and selling electricity, essentially up to a meter,” he said in a telephone interview. “We started seeing this make-move-and-sell model moving to the customer premises. And so we decided to become involved in this space.”

Ref : NYtimes.com

Article 2

K. R. SRIDHAR – THE INVENTOR OF BLOOM BOX, THE HOLY GRAIL OF CLEAN ENERGY

Dr. K. R. Sridhar is a man of many talents: a true Indian scholar, nuclear physicist, professor of aerospace and mechanical engineering, innovator, entrepreneur and, a passionate futurist who envisions a self-reliant world. Currently, serving as the principal co-founder and CEO of Bloom Energy, his innovation, the Bloom Box, has been widely regarded as the the “Holy Grail” of clean energy.

Born in India, in 1960, Sridhar completed his B Tech in Mechanical Engineering from National Institute of Technology, Tiruchirappalli under the University of Madras. On completion, he moved to the United States to complete an M.S. and Ph.D. in Nuclear Engineering at the University of Illinois.
After graduating from the university, in 1990, he started his career at the the University of Arizona sponsored Space Technologies Laboratory (STL) and was soon promoted to the post of the director.

In 1994, Dr. Sridhar joined NASA to develop a device that could convert water into oxygen for their futuristic Mars mission. Over the next seven years, he led the team of scientists and engineers that successfully developed a device that used solar power and water extracted from the planets and subsequently powered a reactor cell that produced oxygen to breathe and hydrogen to power machines and vehicles. Unfortunately, he could never see his device being used on NASA’s Mars Surveyor 2001 Lander mission. The mission was cancelled for some technical reasons.

Instead of getting disheartened, Dr. Sridhar got a unique idea – he decided to reverse the process and use oxygen and hydrogen to create power, the electricity. In 2001, he founded a company called Ion America to develop fuel-cell technology that could generate eco-friendly electricity at highly inexpensive prices. In less than 3 years, Sridhar managed to raise $400 million through venture capital. In 2002, he shifted the company center to the NASA Ames Research Center; and in 2006, he renamed the company to Bloom Energy and called his fuel cells the ‘Bloom Box’.

The Bloom Box Technology

According to Dr. Sridhar, a Bloom Box comprises of some fuel cells or skinny square-like batteries that use oxygen and fuel to generate electricity with zero emissions. The fuel cells are primarily made of sea sand that is baked and molded into ceramic squares and then painted with black and green ink on the both sides. Each fuel cell is so powerful that it can light a 40 watt bulb. The fuel cells are then stacked in a metal box sandwiched with metal alloy plates. Finally the power boxes are housed in a refrigerator-like large boxes that are called the Bloom Box. Finally, to generate electricity, the box is supplied with the oxygen is supplied from one side and and fuel ( it could be anything the fossil-fuel, bio-fuel, or solar power) is fed from the other side. When they combine, they create a chemical reaction and thus electricity is generated without any pollution or noise.

Watch the following interview in which Dr. Sridhar sheds light on his technology and his dream of lighting the whole world with clean and environmentally friendly energy.

Ref : Brainprick.com