Air purifying system

An air purifying system comprising:

• a carbon dioxide remover including a first space and a second space that are partitioned from each other by at least one gas permeable membrane that includes micropores whose diameter is 50 nm or less;
• a feed passage that leads to-be-purified air from inside of a room to the first space;
• a supply passage that supplies clean gas that has a lower carbon dioxide concentration and a higher oxygen concentration than the to-be-purified air to the second space;
• a discharge passage that discharges, from the second space, mixed gas that is a mixture of the clean gas and carbon dioxide that has permeated through the gas permeable membrane from the first space;
• a return passage that leads purified air from the first space into the room, the purified air resulting from removing carbon dioxide from the to-be-purified air;
• and
• adjusting equipment that adjusts a gas pressure in the first space and a gas pressure in the second space to be substantially equal to each other, wherein
• the to-be-purified air flows in the first space along a surface of the gas permeable membrane, and the clean gas flows in the second space along a surface of the gas permeable membrane,
• the carbon dioxide remover includes at least one membrane module, the membrane module including the first space, the second space, and the gas permeable membrane,
• the membrane module includes:
• a first introduction port, through which the to-be-purified air is introduced into the first space;
• a first discharge port, through which the purified air is discharged from the first space;
• a second introduction port, through which the clean gas is introduced into the second space;
• and
• a second discharge port, through which the mixed gas is discharged from the second space,
• the adjusting equipment includes:
• at least one first-space-dedicated adjuster that adjusts a flow rate and a gas pressure in a passage in the membrane module, the passage connecting between the first introduction port and the first discharge port;
• at least one second-space-dedicated adjuster that adjusts a flow rate and a gas pressure in a passage in the membrane module, the passage connecting between the second introduction port and the second discharge port;
• and
• a controller that controls the first-space-dedicated adjuster and the second-space-dedicated adjuster individually,
• either the first-space-dedicated adjuster includes a first valve and a second valve, or the second-space-dedicated adjuster includes a third valve and a fourth valve,
• the first valve is positioned upstream of the first space and communicates with the first introduction port,
• the second valve is positioned downstream of the first space and communicates with the first discharge port,
• the third valve is positioned upstream of the second space and communicates with the second introduction port,
• the fourth valve is positioned downstream of the second space and communicates with the second discharge port, and
• either (i) the gas pressure in the first space and the gas pressure in the second space are adjusted to be substantially equal to each other by adjusting an opening degree of each of the first valve and the second valve individually or (ii) the gas pressure in the first space and the gas pressure in the second space are adjusted to be substantially equal to each other by adjusting an opening degree of each of the third valve and the fourth valve individually.