PROBLEM TO BE SOLVED: To allow oxygen concentration and carbon dioxide concentration of interior air to fall in their respective target ranges, to improve freshness of plants in a housing cabinet.SOLUTION: In an air composition maintenance operation of this interior air-conditioning device, a controller causes a gas supply device to perform a first supply operation, a second supply operation, an outside-air supply operation and a standby operation, while switching therebetween. In the first supply operation, first low-oxygen-concentration air is supplied to an interior. In the second supply operation, second low-oxygen-concentration air having a lower oxygen concentration than the first low-oxygen-concentration air is supplied to the interior. In the outside-air supply operation, outside air is supplied to the interior. In the standby operation, the supply of outside air and low-oxygen-concentration air to the interior is stopped.SELECTED DRAWING: Figure 12COPYRIGHT: (C)2019,JPO&INPIT【課題】庫内空気の酸素濃度と二酸化炭素濃度とをそれぞれの目標範囲に到達させ、収納庫内の植物の鮮度向上を図る。【解決手段】庫内空気調整装置の空気組成維持運転において、制御器は、ガス供給装置に、第１供給動作と第２供給動作と外気供給動作と待機動作とを切り換えながら実行させる。第１供給動作では、第１の低酸素濃度空気が庫内へ供給される。第２供給動作では、第１の低酸素濃度空気よりも酸素濃度の低い第２の低酸素濃度空気が庫内へ供給される。外気供給動作では、外気が庫内へ供給される。待機動作では、低酸素濃度空気および外気の庫内への供給が停止する。【選択図】図１２
