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News that effects the sustainability of life on Earth
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Warm in winter, thanks to summer heat

Warm in winter, thanks to summer heat | Sustain Our Earth | Scoop.it
A whiff of science fiction surrounds the entire idea: storing excess summer heat deep in the earth, only to retrieve it in the cold of winter. But researchers in Zurich have developed a revolutionary system that does just that.
Via Diedert Debusscher, Hans De Keulenaer
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AT&T Invests in More Bloom Energy Fuel Cells

One major advantage of renewable energy is access to a reliable supply of power at a more predictable price than conventional grid-supplied electricity. That’s especially important to tech companies like AT&T, which has just announced that it is expanding its use of fuel cells to power 28 data centers and other facilities in California and Connecticut.

The fuel cells, provided by Bloom Energy, will insulate AT&T’s facilities from grid-supplied electricity price spikes as well as brownouts, blackouts and other grid disruptions. Though fuel cells don’t necessarily count as renewable energy, in this case they will take a big chunk off the carbon footprint of AT&T’s California facilities, and that’s a good start.


Via Hans De Keulenaer
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New Compressed Air Energy Storage System Could Deliver Double ...

New Compressed Air Energy Storage System Could Deliver Double ... | Sustain Our Earth | Scoop.it

The technology is the brainchild of founder Danielle Fong, who initially wanted to use compressed air to power scooters, but has since turned her attention to a larger order of storage: grid-scale.

 

While compressed air storage isn't a new invention, by any means, Fong's innovations greatly improved the efficiency of this type of system, which has been hampered by efficiency losses of up to 50%. Fong's improved version uses a mist of water sprayed into the air storage tanks, which acts to absorb and store the heat generated from the compression (and release it on expansion), allowing the LightSail system to achieve a 90% thermodynamic efficiency in the process, and a 70% overall round-trip efficiency.


Via Hans De Keulenaer, Diedert Debusscher, James Ferguson, Duane Tilden
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