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

Author

Listed:
  • Koichi Kawamoto

    (Kawamoto Engineering, 3-1-11 Kami-Ikebukuro, Toshimaku, Tokyo 170-0012, Japan)

  • Wanghee Cho

    (Department of Architecture, Faculty of Engineering, Kanagawa University, 3-27-1 Rokkakubashi, Kanagawa-ku, Yokohama 221-8686, Japan)

  • Hitoshi Kohno

    (Research and Development Center, Asahi Kogyosha Co., Ltd., 6-17-16 Higashi-Narashino, Narashino, Chiba 275-0001, Japan)

  • Makoto Koganei

    (Department of Architectural Design and Engineering, Graduate School of Science and Engineering, Yamaguchi University, 2-16-1 Tokiwadai, Ube, Yamaguchi 755-8611, Japan)

  • Ryozo Ooka

    (Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan)

  • Shinsuke Kato

    (Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan)

Abstract

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.

Suggested Citation

  • Koichi Kawamoto & Wanghee Cho & Hitoshi Kohno & Makoto Koganei & Ryozo Ooka & Shinsuke Kato, 2016. "Field Study on Humidification Performance of a Desiccant Air-Conditioning System Combined with a Heat Pump," Energies, MDPI, vol. 9(2), pages 1-22, January.
    • Handle: RePEc:gam:jeners:v:9:y:2016:i:2:p:89-:d:63220
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    References listed on IDEAS

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    2. Kai-Shing Yang & Jian-Sin Wang & Shih-Kuo Wu & Chih-Yung Tseng & Jin-Cherng Shyu, 2017. "Performance Evaluation of a Desiccant Dehumidifier with a Heat Recovery Unit," Energies, MDPI, vol. 10(12), pages 1-12, December.
    3. Giampieri, A. & Ma, Z. & Ling-Chin, J. & Roskilly, A.P. & Smallbone, A.J., 2022. "An overview of solutions for airborne viral transmission reduction related to HVAC systems including liquid desiccant air-scrubbing," Energy, Elsevier, vol. 244(PA).
    4. Niemann, Peter & Schmitz, Gerhard, 2020. "Air conditioning system with enthalpy recovery for space heating and air humidification: An experimental and numerical investigation," Energy, Elsevier, vol. 213(C).
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    6. Min-Hwi Kim & Joon-Young Park & Jae-Weon Jeong, 2017. "Energy Saving Potential of a Thermoelectric Heat Pump-Assisted Liquid Desiccant System in a Dedicated Outdoor Air System," Energies, MDPI, vol. 10(9), pages 1-19, September.
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    8. Peter Niemann & Finn Richter & Arne Speerforck & Gerhard Schmitz, 2019. "Desiccant-Assisted Air Conditioning System Relying on Solar and Geothermal Energy during Summer and Winter," Energies, MDPI, vol. 12(16), pages 1-20, August.

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