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Field Study on Humidification Performance of a Desiccant Air-Conditioning System Combined with a Heat Pump

Kawamoto Engineering, 3-1-11 Kami-Ikebukuro, Toshimaku, Tokyo 170-0012, Japan
Department of Architecture, Faculty of Engineering, Kanagawa University, 3-27-1 Rokkakubashi, Kanagawa-ku, Yokohama 221-8686, Japan
Research and Development Center, Asahi Kogyosha Co., Ltd., 6-17-16 Higashi-Narashino, Narashino, Chiba 275-0001, Japan
Department of Architectural Design and Engineering, Graduate School of Science and Engineering, Yamaguchi University, 2-16-1 Tokiwadai, Ube, Yamaguchi 755-8611, Japan
Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
Author to whom correspondence should be addressed.
Academic Editor: Vincent Lemort
Energies 2016, 9(2), 89;
Received: 2 October 2015 / Revised: 4 January 2016 / Accepted: 21 January 2016 / Published: 30 January 2016
A desiccant air-conditioning system was developed as a latent-load-processing air conditioner in a dedicated outdoor air system during the summer. This study investigated the application of this air-conditioning system to humidification during the winter without using make-up water, thereby eliminating the cause of microbial contamination in air-conditioning systems. The experiments were conducted with a system used for summer applications to determine the feasibility of adsorbing vapor from outdoor air and supplying it to an indoor space. The humidification performance, energy efficiency, and operating conditions were examined. Although the conditions were subpar because the experiments were performed with an actual dedicated outdoor air system, the results showed that it is possible to supply air with a minimum humidity ratio of 5.8 g/kg dry air (DA) when the humidity ratio of outdoor air ranges from 1.8 to 2.3 g/kg DA. The minimum humidification performance required for a dedicated outdoor air system was achieved by increasing the airflow rate of the moisture-adsorption side to 2–3 times that of the humidification side. In addition, air leaking from the moisture-adsorption side to the humidification side, improving the mechanical structure, such as by the insulation of the moisture-adsorption side, and an efficient operating method were examined for humidification during the winter. View Full-Text
Keywords: dedicated outdoor air system (DOAS); desiccant; humidification; heat pump dedicated outdoor air system (DOAS); desiccant; humidification; heat pump
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Kawamoto, K.; Cho, W.; Kohno, H.; Koganei, M.; Ooka, R.; Kato, S. Field Study on Humidification Performance of a Desiccant Air-Conditioning System Combined with a Heat Pump. Energies 2016, 9, 89.

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