Direct Air Capture TSA Sorbent Energy Calculator
Atmospheric Carbon Removal: Model Temperature Vacuum Swing Adsorption (TVSA), contactor air-side pressure drops, and electrical/thermal energy per metric ton of ambient $CO_2$ captured.
Ambient Air & Sorbent Performance
Thermal Desorption & Contactor Fans
DAC Energy Consumption Metrics
Recommended Tools & Equipment
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Direct Air Capture (DAC) Solid Sorbent Energy Principles
Direct Air Capture captures carbon dioxide directly from the open atmosphere to achieve net-negative greenhouse gas removals.
1. Volumetric Air Processing Requirement
V_air = 1000 / [ (ppm · 10⁻⁶) · (44.01 / 28.97) · ρ_air · η_capture ] [m³/tonne CO2]
2. Total Specific Energy Consumption
W_fan = ( V_air · ΔP_contactor ) / η_fan [Joules/tonne] Q_thermal = Q_desorption + Q_sensible_sorbent + Q_moisture [GJ/tonne]
Frequently Asked Questions
Why does Direct Air Capture (DAC) require moving millions of cubic meters of air per ton of CO2?
Unlike industrial point-source flue gas which contains $10\% \sim 25\%\;CO_2$, ambient outdoor air contains only $\approx 420\,\text{ppm}$ ($0.042\%\;CO_2$). Because $CO_2$ is so dilute, an air contactor must process between $1.5$ and $2.5\,\text{million}\;\text{m}^3$ of air to capture a single metric ton of $CO_2$, making contactor pressure drop ($\Delta P$) the critical driver of electrical fan power.
What is Temperature Vacuum Swing Adsorption (TVSA)?
TVSA is the predominant regeneration cycle for solid-sorbent DAC systems (such as Climeworks). Ambient air blows through porous amine-functionalized solid monoliths or MOF filters until saturated. The contactor chamber is then sealed, evacuated under mild vacuum ($100\sim 200\,\text{mbar}$), and heated to $95^\circ\text{C}-105^\circ\text{C}$ using low-grade industrial waste heat or heat pumps to desorb high-purity $CO_2$.
How does moisture co-adsorption impact DAC thermal energy consumption?
Solid amine sorbents readily co-adsorb ambient water vapor alongside $CO_2$ (typically $1.0$ to $2.0\,\text{mol}\;H_2O$ per mole $CO_2$). During thermal regeneration, vaporizing this water consumes significant latent heat of vaporization ($\approx 2.4\,\text{kJ/g}$), which can account for $25\%$ to $40\%$ of total thermal energy consumption.