Field Study on Humidification Performance of a Desiccant Air-Conditioning System Combined with a Heat Pump
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 eliminat...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2016-01-01
|
| Series: | Energies |
| Subjects: | |
| Online Access: | http://www.mdpi.com/1996-1073/9/2/89 |
| _version_ | 1811305657046925312 |
|---|---|
| author | Koichi Kawamoto Wanghee Cho Hitoshi Kohno Makoto Koganei Ryozo Ooka Shinsuke Kato |
| author_facet | Koichi Kawamoto Wanghee Cho Hitoshi Kohno Makoto Koganei Ryozo Ooka Shinsuke Kato |
| author_sort | Koichi Kawamoto |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-13T08:30:27Z |
| format | Article |
| id | doaj.art-b4eac72aea91475cb7332c4908f25179 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-13T08:30:27Z |
| publishDate | 2016-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-b4eac72aea91475cb7332c4908f251792022-12-22T02:54:17ZengMDPI AGEnergies1996-10732016-01-01928910.3390/en9020089en9020089Field Study on Humidification Performance of a Desiccant Air-Conditioning System Combined with a Heat PumpKoichi Kawamoto0Wanghee Cho1Hitoshi Kohno2Makoto Koganei3Ryozo Ooka4Shinsuke Kato5Kawamoto Engineering, 3-1-11 Kami-Ikebukuro, Toshimaku, Tokyo 170-0012, JapanDepartment of Architecture, Faculty of Engineering, Kanagawa University, 3-27-1 Rokkakubashi, Kanagawa-ku, Yokohama 221-8686, JapanResearch and Development Center, Asahi Kogyosha Co., Ltd., 6-17-16 Higashi-Narashino, Narashino, Chiba 275-0001, JapanDepartment of Architectural Design and Engineering, Graduate School of Science and Engineering, Yamaguchi University, 2-16-1 Tokiwadai, Ube, Yamaguchi 755-8611, JapanInstitute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, JapanInstitute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, JapanA 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.http://www.mdpi.com/1996-1073/9/2/89dedicated outdoor air system (DOAS)desiccanthumidificationheat pump |
| spellingShingle | Koichi Kawamoto Wanghee Cho Hitoshi Kohno Makoto Koganei Ryozo Ooka Shinsuke Kato Field Study on Humidification Performance of a Desiccant Air-Conditioning System Combined with a Heat Pump Energies dedicated outdoor air system (DOAS) desiccant humidification heat pump |
| title | Field Study on Humidification Performance of a Desiccant Air-Conditioning System Combined with a Heat Pump |
| title_full | Field Study on Humidification Performance of a Desiccant Air-Conditioning System Combined with a Heat Pump |
| title_fullStr | Field Study on Humidification Performance of a Desiccant Air-Conditioning System Combined with a Heat Pump |
| title_full_unstemmed | Field Study on Humidification Performance of a Desiccant Air-Conditioning System Combined with a Heat Pump |
| title_short | Field Study on Humidification Performance of a Desiccant Air-Conditioning System Combined with a Heat Pump |
| title_sort | field study on humidification performance of a desiccant air conditioning system combined with a heat pump |
| topic | dedicated outdoor air system (DOAS) desiccant humidification heat pump |
| url | http://www.mdpi.com/1996-1073/9/2/89 |
| work_keys_str_mv | AT koichikawamoto fieldstudyonhumidificationperformanceofadesiccantairconditioningsystemcombinedwithaheatpump AT wangheecho fieldstudyonhumidificationperformanceofadesiccantairconditioningsystemcombinedwithaheatpump AT hitoshikohno fieldstudyonhumidificationperformanceofadesiccantairconditioningsystemcombinedwithaheatpump AT makotokoganei fieldstudyonhumidificationperformanceofadesiccantairconditioningsystemcombinedwithaheatpump AT ryozoooka fieldstudyonhumidificationperformanceofadesiccantairconditioningsystemcombinedwithaheatpump AT shinsukekato fieldstudyonhumidificationperformanceofadesiccantairconditioningsystemcombinedwithaheatpump |