"The discussion of energy consumption for cryogenic & combined #DirectAirCapture systems is explored in the newly published thesis."ποΈ
Details are discussed in aπ§΅β¬οΈ
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
3οΈβ£ base systems studied:
πΈ NC (no precompression/turbine recovery)
πΈPC (precompression only)
πΈTR (precompression & turbine recovery)
at 3οΈβ£ different compression ratios, n=400, 800 & 2000.
Then, a combination #DAC system, PSA, was modeled."
3/10
"A dual-column, 4οΈβ£-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= -50β¦C."
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 β¬οΈ commons.erau.edu/edt/728/
π¨Scientists Make Strides in Resurrecting Woolly Mammoths to Combat Climate Changeπ¨
A pioneering biotech firm has successfully genetically modified mice, marking a key step toward developing mammoth-like elephants to restore Arctic ecosystems & slow permafrost thaw.π§΅1/10
2/ Colossal Biosciences (@colossal), a Texas-based biotech firm, has engineered mice with mammoth-like traits. Their ultimate goal? Create herds of cold-adapted elephants that could help protect permafrost and reduce carbon emissions.
3/Why does this matter for climate change?
Permafrost holds huge amounts of C. When it melts it emits CO2 & CH4βincreasing global warming. Mammoths once maintained Arctic grasslands, which helped insulate the permafrost. Colossal wants to bring this process back via neo-mammoths
π° Here's your round-up of top #CarbonDioxideRemoval News / Developments from this week (24 February - 02 March 2025):
π:
π§΅0/23
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 Canadaβs 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 issueβit'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 futuresπ§΅1/9
2/ SAI could cool the planetβbut who controls it controls global climate security.
Key risks of unilateral deployment:
π΄ Termination shock
π΄ Environmental disruptions
π΄ SAI as a potential weapon
π΄ Geopolitical leverageβboth 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 influenceβor deter & risk falling behind?
π° Here's your round-up of top #CarbonDioxideRemoval News / Developments from this week (17 February - 23 February 2025):
π:
π§΅0/19
@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.