Geoengineering Info Profile picture
May 14, 2023 β€’ 10 tweets β€’ 7 min read β€’ Read on X
πŸš¨βœοΈππ„π– πƒπŽπ‚π“πŽπ‘π€π‹ π“π‡π„π’πˆπ’βœοΈπŸš¨

"The discussion of energy consumption for cryogenic & combined #DirectAirCapture systems is explored in the newly published thesis."πŸŽ›οΈ

Details are discussed in aπŸ§΅β¬‡οΈ
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
3️⃣ base systems studied:
πŸ”Έ NC (no precompression/turbine recovery)
πŸ”ΈPC (precompression only)
πŸ”ΈTR (precompression & turbine recovery)
at 3️⃣ different compression ratios, n=400, 800 & 2000.
Then, a combination #DAC system, PSA, was modeled."
3/10 Image
"A dual-column, 4️⃣-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 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 ⬇️
commons.erau.edu/edt/728/

#DirectAirCapture
#DAC

9/10

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More from @geoengineering1

Aug 31
πŸ“πŸ’‘π–πžπžπ€π₯𝐲 𝐂𝐃𝐑 𝐇𝐒𝐠𝐑π₯π’π π‘π­π¬πŸ’‘πŸ“

πŸ“° Here's your round-up of top #CarbonDioxideRemoval News / Developments from this week (25 August - 31 August 2025):

πŸ”—:

🧡0/20
Frontier signed a $31.3M deal with Planetary to scale ocean alkalinity enhancement, aiming to remove 115,211 tCOβ‚‚ at $270/t from 2026–2030.


1/20frontierclimate.com/writing/planet…
Biochar platform Terraton raised $11.5 million seed funding led by Lowercarbon Capital and Gigascale Capital.


2/20reuters.com/press-releases…
Read 22 tweets
Aug 27
🚨In a new study published in @OneEarth_CP, researchers reveal that human land activities have stripped away roughly 24% of terrestrial carbon stocks (equivalent to 344 billion metric tons of C), underscoring an urgent need to reframe land-use & climate policy.

Details🧡1/10 Image
2/ Plants + soils store more carbon than the atmosphere + all fossil reserves combined.

But farming, grazing, and forest use have stripped away this natural shield, turning land from a carbon bank into a carbon source.
3/ Researchers call this loss the terrestrial carbon deficit - the gap between what ecosystems could hold (β€˜potential’) vs. what they actually hold (β€˜actual’).

The shortfall? 344 PgC (24% of natural stocks). Image
Read 11 tweets
Aug 22
🚨Can aeosols counter AMOC collapse?

A NEW study suggests Stratospheric Aerosol Injection (#SAI) could help prevent the decline of the Atlantic Meridional Overturning Circulation (#AMOC), but only if aerosols are injected in the appropriate latitude & hemisphere.

DETAILS🧡1/12 Image
2/ The AMOC is a key component of Earth’s climate system, transporting heat and nutrients across the Atlantic.

Its decline, already underway, is projected to accelerate under global warming, possibly approaching a tipping point this century. Image
3/ Using CESM2(WACCM6), Bednarz et al. ran sensitivity experiments with SOβ‚‚ injections at latitudes from 45Β°S to 45Β°N.

Each scenario injected 12 Tg-SOβ‚‚/yr (2035–2069) to test how SAI location affects AMOC stability.
Read 13 tweets
Aug 21
🚨Enhanced Rock Weathering (#ERW) could remove up to 700 Mt COβ‚‚ by 2070 in the UK if quarry production scales 5–10Γ—.

Larger extraction sites boost efficiency but raise major social, logistical & policy challenges.

A new @CommsEarth study models the trade-offs.🧡1/11 Image
2/ ERW involves spreading crushed silicate rocks on croplands to capture COβ‚‚.

While previous studies examined its chemistry & agronomic benefits, this work focuses on the supply chain: can the UK sustainably scale rock extraction to meet net-zero needs?
3/ The authors model deployment from 2025–2070 under 3 supply scenarios:

Low (32 Mt rock/yr), medium (97 Mt rock/yr) & high rock (166 Mt rock/yr) demand with variations in whether expansion relies on active, inactive, or new quarries. Image
Read 12 tweets
Aug 17
πŸ“πŸ’‘π–πžπžπ€π₯𝐲 𝐂𝐃𝐑 𝐇𝐒𝐠𝐑π₯π’π π‘π­π¬πŸ’‘πŸ“

πŸ“° Here's your round-up of top #CarbonDioxideRemoval News / Developments from this week (11 August - 17 August 2025):

πŸ”—:

🧡0/19
Carbon removal company @equatic_tech raised $11.6M Series A led by Temasek Trust’s Catalytic Capital and Kibo Invest.

1/19
eco-business.com/press-releases…
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2/19qcintel.com/carbon/article…
Read 21 tweets
Aug 13
🚨A new CSIRO-led study finds Australia can achieve net-zero emissions cost-effectively by 2050 if it acts early.

Rapid decarbonisation of electricity, scaled #CarbonRemoval, and strategic land offsets are central to success.

Details🧡1/9 Image
2/ The research adapts the IEA’s global net-zero scenarios to Australia’s economy using an integrated economic–energy model.

It compares a Rapid Decarbonisation pathway, consistent with limiting warming to 1.5 Β°C, with a Stated Policies path leading to ~2.6 Β°C by 2100. Image
3/ Electricity emerges as cornerstone. In rapid pathway, coal is 85% retired by 2030 & fully phased out by 2035.

Renewables supply ~90% of generation by 2030, cutting emissions intensity to ~15% of 2020 levels & enabling deeper decarbonisation across various sectors. Image
Read 10 tweets

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