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Cooling performance of a 100% outdoor air system integrated with indirect and direct evaporative coolers

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  • Kim, Min-Hwi
  • Jeong, Jae-Weon

Abstract

The object of this study was to evaluate the energy performance of an indirect and direct evaporative cooler assisted 100% outdoor air system (IDECOAS), of which a pilot unit was installed in a campus building, during its actual operation in cooling and intermediate seasons. A conventional variable air volume (VAV) system was also installed for comparison with the proposed system. The IDECOAS operated in two operation modes (i.e., single-stage and two-stage operation) depending on the seasonal conditions (i.e., intermediate season and cooling season). In addition, the effectiveness of the indirect evaporative cooler (IEC) and the direct evaporative cooler (DEC) were monitored by measuring the variation of air temperature and relative humidity at each measurement location. The fan and cooling coil energy consumption were also measured by installing watt meters on each device. It was concluded that the IDECOAS operating in the two-stage mode in the intermediate season shows a 51% energy saving over the conventional VAV system. However, the proposed system may consume 36% more operating energy than the conventional VAV system during the cooling season. This may be caused by limited cooling performance of the IEC in hot and humid climate.

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  • 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.
    • Handle: RePEc:eee:energy:v:52:y:2013:i:c:p:245-257
    DOI: 10.1016/j.energy.2013.02.008
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    Cited by:

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    5. Shiying Li & Jae-Weon Jeong, 2018. "Energy Performance of Liquid Desiccant and Evaporative Cooling-Assisted 100% Outdoor Air Systems under Various Climatic Conditions," Energies, MDPI, vol. 11(6), pages 1-22, May.
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    7. Bo Shen & Joshua New & Moonis Ally, 2019. "Energy and Economics Analyses of Condenser Evaporative Precooling for Various Climates, Buildings and Refrigerants," Energies, MDPI, vol. 12(11), pages 1-17, May.
    8. Campaniço, Hugo & Soares, Pedro M.M. & Hollmuller, Pierre & Cardoso, Rita M., 2016. "Climatic cooling potential and building cooling demand savings: High resolution spatiotemporal analysis of direct ventilation and evaporative cooling for the Iberian Peninsula," Renewable Energy, Elsevier, vol. 85(C), pages 766-776.
    9. Chen, Yi & Yan, Huaxia & Yang, Hongxing, 2018. "Comparative study of on-off control and novel high-low control of regenerative indirect evaporative cooler (RIEC)," Applied Energy, Elsevier, vol. 225(C), pages 233-243.
    10. Hadeed Ashraf & Muhammad Sultan & Uzair Sajjad & Muhammad Wakil Shahzad & Muhammad Farooq & Sobhy M. Ibrahim & Muhammad Usman Khan & Muhammad Ahmad Jamil, 2022. "Potential Investigation of Membrane Energy Recovery Ventilators for the Management of Building Air-Conditioning Loads," Energies, MDPI, vol. 15(6), pages 1-23, March.
    11. Ghiaus, Christian, 2014. "Linear algebra solution to psychometric analysis of air-conditioning systems," Energy, Elsevier, vol. 74(C), pages 555-566.
    12. 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.

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