To provide a waste heat utilization ventilation air conditioner having no energy loss following ventilation, high in energy efficiency, and being space-saving and inexpensive.SOLUTION: A ventilation air conditioner has a honeycomb rotor with a function of adsorbing or absorbing contaminant such as carbon dioxide. The honeycomb rotor is arranged in a rotor rotation device having at least a treatment zone and a desorptive regeneration zone. The honeycomb rotor is configured to pass air to be treated through the treatment zone to remove the contaminant such as carbon dioxide and supply treated air, introduce saturated steam generated by directly spraying water to a heat exchanger provided at a regenerative desorption zone inlet； and desorb the contaminant such as carbon dioxide to discharge it to the outside.SELECTED DRAWING: Figure 4【課題】本発明は換気に伴うエネルギー消失がなく、エネルギー効率の高い、省スペース、かつ低コスト、排熱利用換気空調装置を提供する。【解決手段】本件発明は以上の課題を解決するため、二酸化炭素等汚染質の吸着又は吸収機能を持つハニカムロータを有し、ハニカムロータを、少なくとも処理ゾーンと脱着再生ゾーンを備えるロータ回転装置内に配置し、処理空気を処理ゾーンに通して二酸化炭素等汚染質を除去して給気すると共に、再生脱着ゾーン入口に設けた熱交換器に直接水を噴霧して発生させた飽和蒸気を導入して、二酸化炭素等汚染質を脱着して屋外に排出することを特徴とする。【選択図】 図４
