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Dawid Hanak's picture
Associate Professor in Energy and Process Engineering Cranfield University

I'm a climate warrior who believes that achieving our climate commitments requires immediate action. We can do this by deploying green energy technologies and building world-leading engineering...

  • Member since 2020
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  • May 11, 2021

Do you know what direct air capture is?

It's a piece of an engineering kit that can suck CO2 directly out of thin air.

Whenever I speak about DAC, the same questions come up. I thought I'd share some of the answers here.

๐ƒ๐จ ๐ฐ๐ž ๐ง๐ž๐ž๐ ๐ƒ๐€๐‚ ๐š๐ญ ๐š๐ฅ๐ฅ?

I believe it depends. It depends on how well we will decarbonise our economy and whether our activities will converge towards the Paris Agreement targets.

๐–๐ก๐ž๐ง ๐ฐ๐ž ๐ฐ๐ข๐ฅ๐ฅ ๐ง๐ž๐ž๐ ๐ƒ๐€๐‚?

I don't think we should be working towards a specific timeline here. We can deploy DAC now if it makes sense from a business perspective.

We may need to ramp up the deployment of DAC and other greenhouse gas removal technologies, if we fail to decarbonise our economy (i.e. 2030 and 2050).

๐–๐ก๐š๐ญ ๐š๐ซ๐ž ๐œ๐ก๐š๐ฅ๐ฅ๐ž๐ง๐ ๐ž๐ฌ ๐จ๐Ÿ ๐ƒ๐€๐‚?

CO2 concentration in the air is low (415ppm), making it a difficult separation. DAC also needs to be driven by low-carbon or renewable energy.

Energy requirement and volume of the contactors result in high OPEX and CAPEX. Currently, DAC is estimated to cost 200-500 โ‚ฌ/tCO2.


There are several ways in which we can reduce the cost and improve the business case for DAC

Matt Chester's picture
Matt Chester on May 11, 2021

CO2 concentration in the air is low (415ppm), making it a difficult separation. 

is this a limiting factor by physics, or can the technology improve such that it can separate at lower concentrations? 

Dawid Hanak's picture
Thank Dawid for the Post!
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