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May 14, 2023 โ€ข 10 tweets โ€ข 7 min read โ€ข Read on X
๐Ÿšจโœ๏ธ๐๐„๐– ๐ƒ๐Ž๐‚๐“๐Ž๐‘๐€๐‹ ๐“๐‡๐„๐’๐ˆ๐’โœ๏ธ๐Ÿšจ

"The discussion of energy consumption for cryogenic & combined #DirectAirCapture systems is explored in the newly published thesis."๐ŸŽ›๏ธ

Details are discussed in a๐Ÿงตโฌ‡๏ธ
1/10 ImageImage
In this novel approach, "a thermodynamic model was constructed using psychometric theories to model the #desublimation of CO2 in a #DAC system. The system was modeled
to include a precooling heat exchanger & a deposition chamber where the desublimation
of CO2 occurs."
2/10 Image
3๏ธโƒฃ base systems studied:
๐Ÿ”ธ NC (no precompression/turbine recovery)
๐Ÿ”ธPC (precompression only)
๐Ÿ”ธTR (precompression & turbine recovery)
at 3๏ธโƒฃ different compression ratios, n=400, 800 & 2000.
Then, a combination #DAC system, PSA, was modeled."
3/10 Image
"A dual-column, 4๏ธโƒฃ-step Skarstrom Cycle PSA (pressure swing adsorption & cryogenic distillation) unit was analyzed using Extended Langmuir Models & the
ideal gas law to simulate a CO2 conc. prior to the deposition chamber. The NC & PSA systems were assessed at Tamb= -50โ—ฆC."
4/10 Image
This study finds that "while increasing the compression ratio of the system, there is no net energy benefit when capturing CO2 given the current state-of-the-art in commercial compressor & #cryocooler capabilities."
5/10 Image
"The assessment of the efficiency of a precooler versus TR finds that it is more advantageous to utilize a heat exchanger precooler than precompression with turbine recovery in a #DAC system. Combining DAC systems may yield a more efficient system."
6/10 Image
"PSA combined with cryogenic capture is less energy intensive than cryogenic capture alone. In a combined #DAC system with PSA and cryogenic distillation,
the PSA unit has a significantly lower energy consumption than the #cryocooler."
7/10 ImageImage
"Increasing the concentration of CO2 entering the deposition chamber significantly decreases the required energy consumption of the #cryocooler."
8/10 Image
Read the complete #Doctoral #Thesis entitled: "Atmospheric Carbon Capture: A Review on Current Technologies and Analysis of Energy Consumption for Various Direct Air Capture (DAC) Systems" here โฌ‡๏ธ
commons.erau.edu/edt/728/

#DirectAirCapture
#DAC

9/10

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More from @geoengineering1

Mar 2
๐Ÿ“๐Ÿ’ก๐–๐ž๐ž๐ค๐ฅ๐ฒ ๐‚๐ƒ๐‘ ๐‡๐ข๐ ๐ก๐ฅ๐ข๐ ๐ก๐ญ๐ฌ๐Ÿ’ก๐Ÿ“

๐Ÿ“ฐ Here's your round-up of top #CarbonDioxideRemoval News / Developments from this week (24 February - 02 March 2025):

๐Ÿ”—:

๐Ÿงต0/23
The Frontier Buyers has teamed up with carbon removal developer Phlair, committing to invest $30.6 million in electrochemical direct air capture to remove 47,000 tons of CO2 from 2027 to 2030.

1/23
frontierclimate.com/writing/phlair
B.C. Centre for Innovation and Clean Energy launched Canadaโ€™s first CDR fund, offering $3M to support early-stage, hard-tech carbon removal solutions for decarbonizing B.C. and Canada.

2/23
cice.ca/knowledge-hub/โ€ฆ
Read 26 tweets
Feb 27
๐ŸšจThe Big Green Button: Who Gets to Push It?

"Geoengineering isn't just a climate issueโ€”it's a geopolitical chess game. Only US & China have power to unilaterally deploy #SAI at scale."

Will they race to control skies or seek climate diplomacy? New study explores 4 futures๐Ÿงต1/9 Image
2/ SAI could cool the planetโ€”but who controls it controls global climate security.

Key risks of unilateral deployment:
๐Ÿ”ด Termination shock
๐Ÿ”ด Environmental disruptions
๐Ÿ”ด SAI as a potential weapon
๐Ÿ”ด Geopolitical leverageโ€”both a threat & opportunity Image
3/ This creates a security gap:

The US & China are locked in great power competition, yet neither has a clear strategy on SAI.

Who moves first? Who controls the stratosphere? The dilemma: Deploy & gain influenceโ€”or deter & risk falling behind? Image
Read 11 tweets
Feb 25
๐Ÿšจ๐Ÿ—“CDR REMINDERS!๐Ÿ—“๐Ÿšจ

Here's a list of what's coming up this week (25 February - 03 March 2025) in the field of #CarbonDioxideRemoval

#CDREvents #Deadlines #CDRJobs

๐Ÿ”—๐Ÿ—“๏ธLink to the CDR Events Calendar:


๐Ÿงต1/19 teamup.com/kshqbfhrqkw36sโ€ฆImage
EVENTโ€”This is CDR: Octavia Carbonโ€™s Project Hummingbird โ€“ Pioneering Direct Air Capture in Africa by @openaircollect

๐Ÿ—“25 February 2025
๐Ÿ“Online
๐Ÿ”—

2/19youtube.com/live/fmbCJIFEtโ€ฆ
EVENTโ€”CDR at DoE is dead - or is it? by CDR Policy Scoop

๐Ÿ—“25 February 2025
๐Ÿ“Online
๐Ÿ”—

3/19linkedin.com/events/cdratdoโ€ฆ
Read 21 tweets
Feb 23
๐Ÿ“๐Ÿ’ก๐–๐ž๐ž๐ค๐ฅ๐ฒ ๐‚๐ƒ๐‘ ๐‡๐ข๐ ๐ก๐ฅ๐ข๐ ๐ก๐ญ๐ฌ๐Ÿ’ก๐Ÿ“

๐Ÿ“ฐ Here's your round-up of top #CarbonDioxideRemoval News / Developments from this week (17 February - 23 February 2025):

๐Ÿ”—:

๐Ÿงต0/19
@Arcaclimate has secured $12.2 million from Australian venture capital firms Side Stage Ventures and Saniel Ventures to help scale its carbon removal technology at Western Australian mine sites.

1/19
capitalbrief.com/briefing/arca-โ€ฆ
Qualterra, a company that converts organic waste into biochar for soil health and carbon sequestration, secured $4.5M to expand biochar production, launch carbon credits, and scale plant propagation.

2/19
biochartoday.com/2025/02/23/quaโ€ฆ
Read 22 tweets
Feb 20
๐ŸšจWhat if we could remove methane from the atmosphereโ€”fast?๐Ÿšจ

A new study proposes two ways to use ๐š๐ญ๐จ๐ฆ๐ข๐œ ๐œ๐ก๐ฅ๐จ๐ซ๐ข๐ง๐ž to destroy this powerful GHG: one with reactors, the other by releasing chlorine into the air. But one of these ideas comes with serious risks:๐Ÿงต1/10 Image
2/ Methane is a powerful but short-lived greenhouse gas, responsible for ~0.5ยฐC of global warming. "Itโ€™s 80x more potent than COโ‚‚ over 20 years," and its atmospheric levels continue to riseโ€”despite global pledges to cut emissions. Image
3/ In nature, hydroxyl (OH) radicals break down methane, but the process is slow.

Chlorine (Cl) radicals can do the same job 16x faster, though they are far less abundant in atmโ€”destroying only ~1-4% of methane today.

What if we increased chlorineโ€™s role?
Read 11 tweets
Feb 18
๐Ÿšจ๐ŸบScotlandโ€™s lost forests could rise again with the help of wolves๐Ÿบ๐Ÿšจ

A new study finds that reintroducing these apex predators in the Scottish Highlands could restore wild woodlands & capture ๐Ÿ ๐ฆ๐ข๐ฅ๐ฅ๐ข๐จ๐ง ๐ญ๐จ๐ง๐ฌ ๐จ๐Ÿ ๐‚๐Žโ‚‚ ๐š๐ง๐ง๐ฎ๐š๐ฅ๐ฅ๐ฒ (#CDR). Hereโ€™s how:๐Ÿงต1/7 Image
2/ The Scottish Highlands were once a land of towering pines and roaming wolves. But 250 years ago, wolves vanishedโ€”and with them, natureโ€™s balance. Red deer, left unchecked, now number 400,000, grazing young trees before they can take root.
3/ Researchers modeled what would happen if wolves returned to the Cairngorms, the Central Highlands, and beyond.

Their findings? 167 wolves could reduce deer numbers enough for forests to regrow naturallyโ€”on a vast scale. Image
Read 8 tweets

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