In the past studies, we proposed a new type of desiccant air-conditioning which combined with a CO_2 heat pump, and the system was evidenced with lower energy consumption than conventional air-conditioning systems. But in these studies, the proposed desiccant air-conditioning system is considered providing only dehumidification and cooling usage. However, the system can be used in reverse for humidification/heating to deal with the cold and dry climates, such as the winter period of Tokyo. In this paper, a desiccant air-conditioning system providing humidification and heating usage is proposed, and two kinds of system flows of the proposed system are studied experimentally. In this system, vapor from the outdoor air is the moisture source, and the heating and humidification power is sufficient under the weather in early March in Chiba city. With different regeneration temperature and flow rate ratio between adsorption side and humidification side, heating and humidification power are possible to be controlled to fit the load of the buildings. Furthermore, we compared the energy consumption between the CO_2 heat pump combined desiccant air-conditioning system and a conventional system under the same humidification/heating conditions. The result shows that the proposed system can provide 24% at the maximum energy saving effect.
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