"The discussion of energy consumption for cryogenic & combined #DirectAirCapture systems is explored in the newly published thesis."๐๏ธ
Details are discussed in a๐งตโฌ๏ธ
1/10
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
3๏ธโฃ base systems studied:
๐ธ NC (no precompression/turbine recovery)
๐ธPC (precompression only)
๐ธTR (precompression & turbine recovery)
at 3๏ธโฃ different compression ratios, n=400, 800 & 2000.
Then, a combination #DAC system, PSA, was modeled."
3/10
"A dual-column, 4๏ธโฃ-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= -50โฆC."
4/10
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
"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
"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
"Increasing the concentration of CO2 entering the deposition chamber significantly decreases the required energy consumption of the #cryocooler."
8/10
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/
๐ฐ Here's your round-up of top #CarbonDioxideRemoval News / Developments from this week (24 February - 02 March 2025):
๐:
๐งต0/23
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.
B.C. Centre for Innovation and Clean Energy launched Canadaโs first CDR fund, offering $3M to support early-stage, hard-tech carbon removal solutions for decarbonizing B.C. and Canada.
"Geoengineering isn't just a climate issueโit'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 futures๐งต1/9
2/ SAI could cool the planetโbut who controls it controls global climate security.
Key risks of unilateral deployment:
๐ด Termination shock
๐ด Environmental disruptions
๐ด SAI as a potential weapon
๐ด Geopolitical leverageโboth a threat & opportunity
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 influenceโor deter & risk falling behind?
๐ฐ Here's your round-up of top #CarbonDioxideRemoval News / Developments from this week (17 February - 23 February 2025):
๐:
๐งต0/19
@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.
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.
๐จWhat if we could remove methane from the atmosphereโfast?๐จ
A new study proposes two ways to use ๐๐ญ๐จ๐ฆ๐ข๐ ๐๐ก๐ฅ๐จ๐ซ๐ข๐ง๐ 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:๐งต1/10
2/ Methane is a powerful but short-lived greenhouse gas, responsible for ~0.5ยฐC of global warming. "Itโs 80x more potent than COโ over 20 years," and its atmospheric levels continue to riseโdespite global pledges to cut emissions.
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 atmโdestroying only ~1-4% of methane today.
๐จ๐บScotlandโs lost forests could rise again with the help of wolves๐บ๐จ
A new study finds that reintroducing these apex predators in the Scottish Highlands could restore wild woodlands & capture ๐ ๐ฆ๐ข๐ฅ๐ฅ๐ข๐จ๐ง ๐ญ๐จ๐ง๐ฌ ๐จ๐ ๐๐โ ๐๐ง๐ง๐ฎ๐๐ฅ๐ฅ๐ฒ (#CDR). Hereโs how:๐งต1/7
2/ The Scottish Highlands were once a land of towering pines and roaming wolves. But 250 years ago, wolves vanishedโand with them, natureโs 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 naturallyโon a vast scale.