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 seal the adsorption chamber from the atmosphere;
• a heat exchanger provided to be capable of exchanging heat with the adsorbent;
• a heat pump configured to transfer heat from a low-temperature heat medium for cooling the adsorbent through the heat exchanger to a high-temperature heat medium for heating the adsorbent through the heat exchanger;
• a heat medium control valve configured to control supply of the low-temperature heat medium and the high-temperature heat medium to the heat exchanger;
• an adsorbent temperature sensor configured to detect a temperature of the adsorbent;
• a low-temperature heat medium temperature sensor configured to detect a temperature of the low-temperature heat medium;
• and
• a controller configured to control the atmospheric control valve and the heat medium control valve to alternately perform an adsorption step and a desorption step, the adsorption step circulating the atmosphere into the adsorption chamber and adsorbing CO2 in the atmosphere to the adsorbent, the desorption step heating the adsorbent and desorbing CO2 from the adsorbent, wherein
• the controller controls the heat medium control valve to switch whether or not to supply the low-temperature heat medium to the heat exchanger in the adsorption step based on the temperature of the adsorbent detected by the adsorbent temperature sensor and the temperature of the low-temperature heat medium detected by the low-temperature heat medium temperature sensor.