How Does the Bloom Box Energy Server Work?

[M.D. Holloway]

Just another trade off? You gotta love the ideas...


How Does the Bloom Box Energy Server Work?
BY Ariel SchwartzWed Feb 24, 2010

Now that the dust has started to settle on the unveiling of the Bloom Energy Server, we thought it might be useful to take a more detailed look at some of the technology behind the fuel cell-powered electricity generator.

•The Bloom Energy Server is made out of fuel cells, or electrochemical cells. A single fuel cell consists of an anode, a cathode, and an electrolyte stuck between the two. As fuel flows in through the anode side and an oxidant comes in over the cathode, a reaction is triggered that causes electrons to move into the fuel cell's circuit, producing electricity.

•The Bloom Energy Server isn't actually a server--that's just a PR buzzword. In actuality, it's a distributed power generator. Each "server" produces 100 kW of power, consists of thousands of fuel cells, costs between $700,000 and $800,000, and pays for itself in three to 5 years based on an energy cost of 8 to 9 cents per kW hour.

•There are many different types of fuel cells. Some of the more popular ones include methanol fuel cells, hydrogen fuel cells, and zinc-air batteries. The Bloom Energy Server consists of solid oxide fuel cells, which are attractive because they can be made out of low-cost materials with high energy efficiencies.

•The cells can run on a variety of fuels, including traditional fuel, natural gas, biomass gas, landfill gas, and ethanol.

•Until now, technical challenges have stopped solid oxide fuel cells from being commercialized, but the company's cells ("sand" baked into ceramic squares that are coated with green and black inks) supposedly have overcome most of the issues. Bloom's Web site has a great animation showing how solid oxide fuel cells work.

•One of the biggest problems with solid oxide fuel cells is their temperature requirement--the ceramic squares only become active at extremely high temperatures (up to 1800 F). That means Bloom's cells will have to prove that they can remain durable under the stress--already, the company has had to come out to replace cells at eBay's installation, which has been running for just 7 months. In general, Bloom expects that its fuel cell stacks will have to be switched out twice during the device's 10 year lifespan.

•Bloom's device generates electricity at 50% to 55% conversion efficiency. In comparison, solar generally produces power at between 10% to 15% efficiency. But unlike solar panels, the Bloom Energy Server produces CO2 as a byproduct. According to the Energy Collective, "CO2 emissions when running on natural gas would be just under 0.8 pounds/kWh, which compares favorably to electricity from central station coal-fired plants (2 lbs/kWh) or natural gas plants (roughly 1.3 lbs/kWh) and the national average for on-grid electricity (around 1.3-1.5 lbs/kWh)." If the box runs on landfill gas or biogas, it produces net zero carbon emissions.

•Eventually, Bloom hopes that a scaled-down version device can be used in homes. A residential Bloom Box would produce 1 kW of power and cost approximately $3,000. But that probably won't happen for at least 10 years.

[red-beard]

When they did the big PR push last year, I tried to get details on the costs, to evaluate operation of the thing with Natural Gas.

[M.D. Holloway]

I'm thinking that the cost doesn't play out...or GE has bought up the technology!

[red-beard]

GE was big into this in the late 90's. They were going to sell an appliance version of this, which would also produce hot water. They bought up a startup in Schenectady, NY. It never panned out.

They bought out PlugPower. A bunch of the better GE engineers went there. The problem was the reformer, which strips the Hydrogen from the methane.

[krystar]

combine this generator with

Inside the giant batteries that will power Russia's Sochi Winter Olympic Games (video) -- Engadget

sounds like a win win