4 ms·
The energy required to liquefy air is probably too large. Say we have 400pm CO2 in air - that's ~630mg of CO2 per kilogram of air. Given that the specific heat
by Tade0 6y ago
The energy required to liquefy air is probably too large. Say we have 400pm CO2 in air - that's ~630mg of CO2 per kilogram of air.
Given that the specific heat of air sits at around 1kJ/kg[0], you'd have to spend over 125kJ of heat energy to get just one gram of CO2 - that's 35Wh.
If you used wind power(14g CO2/kWh) and a heat pump with a coefficient of performance of 1 (not sure how possible at these gradients) you'd "emit" 0.5g of CO2 in the process.
[0] https://www.ohio.edu/mechanical/thermo/property_tables/air/air_Cp_Cv.html https://www.ohio.edu/mechanical/thermo/property_tables/air/a...
- lmilcin 6y agoWell, you missed the fact that the plan is already to liquefy the air. So the air will already be in liquid form. Also I don't think they are going to cool it but rather compress it. Cooling would require constant expenditure of energy to keep it cool whereas you can compress it and leave it in the vessel at room temperature. It takes 33 atmospheres to liquefy nitrogen and 50 for oxygen.