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Impact of an Ultraviolet Reactor on the Improvement of Air Quality Leaving a Direct Evaporative Cooler

Author

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  • Wonjun Kim

    (Department of Architectural Engineering, Hanyang University, Seoul 04763, Korea)

  • Hye-Won Dong

    (Department of Architectural Engineering, Hanyang University, Seoul 04763, Korea)

  • Junseok Park

    (Department of Architectural Engineering, Hanyang University, Seoul 04763, Korea)

  • Minki Sung

    (Department of Architectural Engineering, Sejong University, Seoul 05006, Korea)

  • Jae-Weon Jeong

    (Department of Architectural Engineering, Hanyang University, Seoul 04763, Korea)

Abstract

The purpose of this study is to improve microbial air quality by improving water quality, particularly concerning microbiological aspects, by applying an ultraviolet water purifier system to a direct evaporative cooling (DEC) system. A direct evaporative cooler is an air cooling technique that uses the evaporation of water. Most DECs recirculate water to reduce water use. Evaporative cooling pads and water are biologically contaminated by recirculating water. This contamination can develop into air contamination and cause respiratory illnesses in occupants. It is necessary to use sterilized water in a DEC to prevent respiratory diseases and maintain air quality. In this study, we examine whether improvements in water quality in a DEC affect air quality by dividing experiments into a control group (Control) and a treated group (UV-treated). In the control group, the degree of contamination was measured when a DEC operated for four weeks without ultraviolet water treatment. In UV-treated, the degree of contamination was measured when UV water treatment was applied to a DEC for four weeks. In both Control and UV-treated, microbes were sampled from the water, the evaporative cooling pad surface, and the DEC inlet and outlet air samples in order to compare the levels of contamination. The surface was measured once at four points, and the air was measured four times at two points. A comparison of the two experiments indicated that the degree of microbial contamination of water and air was significantly reduced in the UV-treated group when compared to that in the control group. When the pollution degree of the evaporative cooling pad was compared to the degree of air pollution, it was difficult to obtain a correlation between the two factors, although the results confirmed that the contamination of the evaporative cooling pad caused water pollution. Therefore, it is necessary to operate a water treatment system to maintain the clean air in DECs.

Suggested Citation

  • Wonjun Kim & Hye-Won Dong & Junseok Park & Minki Sung & Jae-Weon Jeong, 2018. "Impact of an Ultraviolet Reactor on the Improvement of Air Quality Leaving a Direct Evaporative Cooler," Sustainability, MDPI, vol. 10(4), pages 1-16, April.
    • Handle: RePEc:gam:jsusta:v:10:y:2018:i:4:p:1123-:d:140208
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    References listed on IDEAS

    as
    1. Kim, Min-Hwi & Jeong, Jae-Weon, 2013. "Cooling performance of a 100% outdoor air system integrated with indirect and direct evaporative coolers," Energy, Elsevier, vol. 52(C), pages 245-257.
    2. Duan, Zhiyin & Zhan, Changhong & Zhang, Xingxing & Mustafa, Mahmud & Zhao, Xudong & Alimohammadisagvand, Behrang & Hasan, Ala, 2012. "Indirect evaporative cooling: Past, present and future potentials," Renewable and Sustainable Energy Reviews, Elsevier, vol. 16(9), pages 6823-6850.
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