VENTILATION SYSTEM AND VENTILATION METHOD

PROBLEM TO BE SOLVED: To provide a ventilation system and a ventilation method that enable reduction in a carbon dioxide concentration in an activity space regardless of a state of outside air and reduction in ventilation frequency in a conventional ventilation method.SOLUTION: A ventilation system 1A, which is a ventilation system for reducing a carbon dioxide concentration in a ventilation target space 2 includes: an electrolytic device 3A that has an electrolytic tank 33 including a positive electrode chamber 32A and a negative electrode chamber 32B partitioned by a partition wall 31, a positive electrode 10A arranged in the positive electrode chamber 32A, a negative electrode 10B arranged in the negative electrode chamber 32B, and a power supply portion 11 for applying voltage to between the positive electrode 10A and the negative electrode 10B and that performs electrolysis of water or electrolyte water solution within the electrolytic tank 33; introduction means 5 for introducing gas including carbon dioxide within the ventilation target space 2 to the negative electrode chamber 32B; and gas recovery use means 6 for returning gas within the negative electrode chamber 32B derived from the introduced gas to the ventilation target space 2. 【課題】外気の状態に関わらず活動空間の二酸化炭素濃度を低下させることができ、且つ、従来の換気方法による換気回数を減らすことができる換気システム及び換気方法を提供する。【解決手段】換気システム１Ａは、換気対象空間２の二酸化炭素濃度を低下させる換気システムであって、隔壁３１で仕切られた陽極室３２Ａ及び陰極室３２Ｂを含む電解槽３３と、陽極室３２Ａに設けられた陽極１０Ａと、陰極室３２Ｂに設けられた陰極１０Ｂと、陽極１０Ａ及び陰極１０Ｂの間に電圧を印加する電源部１１とを有し、水又は電解質の水溶液を電解槽３３内で電気分解する電解装置３Ａと、換気対象空間２内の二酸化炭素を含む気体を陰極室３２Ｂに導入する導入手段５と、当該気体に由来する陰極室３２Ｂ内の気体を換気対象空間２に戻す気体回収利用手段６と、を備える。【選択図】図１