Dac apparatus

A DAC apparatus configured to recover CO2 in the atmosphere, comprising:

• an adsorption chamber provided with an adsorbent for adsorbing or absorbing CO2;
• an atmospheric control valve configured to open the adsorption chamber to the atmosphere or to seal the adsorption chamber from the atmosphere;
• a vacuum piping connecting the adsorption chamber with a vacuum pump;
• a vacuum control valve provided on the vacuum piping;
• a heating device configured to heat the adsorbent;
• and
• a controller configured to control the atmospheric control valve, the vacuum control valve, and the heating device to alternately perform an adsorption step and a desorption step, the adsorption step opening the adsorption chamber to the atmosphere, prohibiting a flow of gas to the vacuum piping, and adsorbing CO2 in the atmosphere to the adsorbent, the desorption step sealing the adsorption chamber, permitting the flow of the gas to the vacuum piping, and heating the adsorbent to desorb CO2 from the adsorbent, wherein
• the controller:
• reduces a pressure of the adsorption chamber to a predetermined pressure by sealing the adsorption chamber and permitting the flow of the gas to the vacuum piping when the adsorption step ends;
• and
• controls the heating device to start heating the adsorbent before the pressure of the adsorption chamber reaches the predetermined pressure in such a manner that the temperature of the adsorbent starts to rise at a timing when the pressure of the adsorption chamber reaches the predetermined pressure.