"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¨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.
Detailsπ§΅1/10
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 (βpotentialβ) vs. what they actually hold (βactualβ).
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.
DETAILSπ§΅1/12
2/ The AMOC is a key component of Earthβs 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.
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 (2035β2069) to test how SAI location affects AMOC stability.
π¨Enhanced Rock Weathering (#ERW) could remove up to 700 Mt COβ by 2070 in the UK if quarry production scales 5β10Γ.
Larger extraction sites boost efficiency but raise major social, logistical & policy challenges.
A new @CommsEarth study models the trade-offs.π§΅1/11
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 2025β2070 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.
π¨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.
Detailsπ§΅1/9
2/ The research adapts the IEAβs global net-zero scenarios to Australiaβs economy using an integrated economicβenergy 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.
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.