PROBLEM TO BE SOLVED: To perform control in an intra-storehouse air conditioner and a container freezer comprising the same so that a carbon dioxide concentration of intra-storehouse air does not exceed a target carbon dioxide concentration, in reducing an oxygen concentration of the intra-storehouse air to a target oxygen concentration by performing gas supply operation.SOLUTION: A control unit, in reducing an oxygen concentration of intra-storehouse air to a target oxygen concentration by making a gas supply device perform gas supply operation, performs amount-increase control when respiration of plants causes a carbon dioxide concentration of the intra-storehouse air to rise to a predetermined first high concentration that is higher than a carbon dioxide concentration of outside air and lower than a target carbon dioxide concentration, the amount-increase control increasing by one stage an oxygen concentration of nitrogen concentration air to be supplied into a storehouse by the gas supply device.SELECTED DRAWING: Figure 12COPYRIGHT: (C)2018,JPO&INPIT【課題】庫内空気調節装置及びそれを備えたコンテナ用冷凍装置において、ガス供給動作を行って庫内空気の酸素濃度を目標酸素濃度まで低下させる際に、庫内空気の二酸化炭素濃度が目標二酸化炭素濃度を超えないように制御する。【解決手段】制御部は、ガス供給装置にガス供給動作を行わせて庫内空気の酸素濃度を目標酸素濃度まで低下させる際に、植物の呼吸によって庫内空気の二酸化炭素濃度が外気の二酸化炭素濃度よりも高く目標二酸化炭素濃度未満の所定の第１高濃度まで上昇すると、ガス供給装置が庫内に供給する上記窒素濃縮空気の酸素濃度を一段階上げる増量制御を行う。【選択図】図１２
