"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¨π A new UCLA-led study reveals surprising findings about the 2022 Hunga TongaβHunga HaΚ»apai underwater volcanic eruption. Despite fears it would push global temps past 1.5Β°C, it actually cooled the Southern Hemisphere by 0.1Β°C!
Here's why:π§΅1/8
#SolarGeoengineering #Aerosols
2/ When Hunga Tonga erupted in January 2022, scientists expected the massive release of water vapor to trigger warming, but a key factor shifted: The eruption produced smaller sulfate aerosols that unexpectedly cooled the atmosphere!
3/ Traditionally, sulfate aerosols cool the Earth by reflecting sunlight, while water vapor warms it. The eruption's aerosols were 50% smaller than those from previous eruptions (like Pinatubo, 1991), which made them more efficient at cooling!
π° Here's your round-up of top #CarbonDioxideRemoval News / Developments from this week (24 March - 30 March 2025):
π:
π§΅0/20
Stockholm Exergi announced its decision to build one of the worldβs largest BECCS facilities, a $1.3B project set to remove ~800,000 tonnes of COβ annually and be operational by 2028.
Enhanced rock weathering startup @EionCarbon secured $33M carbon removal offtake deal with Frontier to remove 78,707 tons of COβ (2027β2030) by applying olivine on U.S. Midwest and South farmland.
π¨How do political affiliations shape attitudes toward #SolarGeoengineering?π¨
A conjoint experiment with 2,123 US voters finds that partisanship outweighs message framingβmeaning who delivers the message matters more than what the message says.
DETAILSπ§΅1/9
2/ The discourse on SG as a climate solution is evolving, but public perceptionsβespecially in the polarized US landscapeβremain underexplored. This study () examines how different narratives & partisan sources influence attitudes.nature.com/articles/s4416β¦
3/Researchers tested 3 SG narratives:
-Complementary: SG as an add-on to emissions cuts
-Substitutive: SG as a standalone climate solution
-Moral hazard: SG as a risky distraction
& the source(Democratic or Republican, researcher or podcaster) to simulate a realistic info env
π° Here's your round-up of top #CarbonDioxideRemoval News / Developments from this week (17 March - 23 March 2025):
π:
π§΅0/21
BlueShift company that aims to unlock sustainable, domestic critical mineral supplies while providing affordable ocean carbon removal exited stealth with $2.1M in pre-seed funding.
Seattle-area startup Homeostasis has secured a $600,000 pre-seed investment to develop technology that removes atmospheric COβ and converts it into graphite, which has industrial uses.