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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
  • 17 items added with 9,632 views
  • May 11, 2021
  • 417 views

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.

๐’๐จ๐ฅ๐ฎ๐ญ๐ข๐จ๐ง๐ฌ?

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

Dawid Hanak's picture
Thank Dawid for the Post!
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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? 

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