PROBLEM TO BE SOLVED: To make an oxygen concentration in inside air adjustable to a concentration lower than an average oxygen concentration of generated nitrogen concentration air, in an inside air conditioner which generates nitrogen concentration air, and supplies it to a container inside so as to adjust the composition of inside air.SOLUTION: In a CA device (60) which generates nitrogen concentration air having a nitrogen concentration higher than air and an oxygen concentration lower than air by alternately performing an absorption operation and a desorption operation in first and second adsorption cylinders (34 and 35), and supplies it to the inside of a container (11), there is performed a second operation mode of discharging to the outside of the container (11), nitrogen concentration air generated during a period until a prescribed time passes from a start point of an absorption operation, and supplying to the inside of the container (11), nitrogen concentration air generated during a period until an ending point of a desorption operation after a prescribed time passes.SELECTED DRAWING: Figure 7COPYRIGHT: (C)2017,JPO&INPIT【課題】窒素濃縮空気を生成してコンテナの庫内に供給して庫内空気の組成を調節する庫内空気調節装置において、庫内空気の酸素濃度を、生成した窒素濃縮空気の平均酸素濃度よりも低い濃度に調節可能に構成する。【解決手段】第1及び第2吸着筒(34,35)において吸着動作と脱着動作とを交互に行わせて空気よりも窒素濃度が高く且つ酸素濃度が低い窒素濃縮空気を生成してコンテナ(11)の庫内に供給するCA装置(60)において、脱着動作の開始時点から所定時間経過するまでの間に生成した窒素濃縮空気をコンテナ(11)の庫外へ排出し、所定時間の経過後、脱着動作の終了時点までの間に生成された窒素濃縮空気をコンテナ(11)の庫内に供給する第2運転モードを行うように構成する。【選択図】図7
