h a l f b a k e r yIt's as much a hovercraft as a pancake is a waffle.
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The most common cause of death in a fire is smoke inhalation. Every house and public building should really be equipped with fire fighter's SCBA air tanks.
Isn't it also convenient that such tanks also pull CO2 from the air, almost indefinitely?
If just 1% of people in the world owned a 6.8L air
tank, it would sequester 408 million liters of compressed air worldwide.
There are real doubts that the manufacturing of new tanks and related equipment would be carbon neutral. But it is possible over the long term that refilling tanks would become net carbon neutral.
On calculating costs to compress air
radiative_20cooled_20water_20condenser
[4and20, Oct 25 2018]
[link]
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//such tanks also pull CO2 from the air, almost indefinitely?//
How is that? My understanding is that SCBA tanks are filled
with either air or an oxygen-containing gas mix. How do they
pull CO2 from the air (other than by containing air, along with
the tiny amount of CO2 it contains)? |
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Wikipedia says that dry air contains 0.04% carbon dioxide. |
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So, 163,000 liters of CO2. |
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On the other hand, Cartridge-operated fire extinguishers use compressed CO2 and can be refilled more easily. Most houses still seem to lack a fire extinguisher. |
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Well, that's a lifestyle choice, i.e. opting out of surviving in the event of a fire ... |
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What is the cost of a household unit that sequesters C02 into a SCUBA tank? True, if cheap enough, a tank per global household might add up. |
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Bring out your energetically low carbon, bring out your energetically low carbon. |
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It's not cheap. A complete fire fighter's unit can sell online for several thousand dollars or more. |
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The equation to calculate energy costs for sequestration seem to be buried at the bottom of the linked HB idea. |
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Steel is probably the best material for these tanks, cheap
reliable and tough. Steel is about 1.9 tonnes of CO2
released for every tonne of steel. A 6.8l tank weighs just
shy of 4kg, so that's 4*1.9 = 7.6 kg CO2 released into the
atmosphere per cylinder. Or about 532,000 tonnes for 1%
population. |
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On the other side, we have a 6.8l tank at say 3000
psi/200 Bar, which is 1360 l air equivalent. That's 1.36
m3. CO2 is 1.97 kg/m3 so at 0.04% That's about 1g of
CO2, 7000 tonnes for 1%. So the net release is about
535,000 tonnes, or a 747 flying for 135 million km. |
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It's not all bad news if you could somehow fill the tanks
with pure CO2 you'd only be off by 15 fold or so. |
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