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Impact of Heat Pump-Driven Liquid Desiccant Dehumidification on the Energy Performance of an Evaporative Cooling-Assisted Air Conditioning System

Author

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  • Jang-Hoon Shin

    (Department of Architectural Engineering, College of Engineering, Hanyang University, 222 Wangsimni-Ro, Seongdong-Gu, Seoul 04763, Korea)

  • Joon-Young Park

    (Department of Architectural Engineering, College of Engineering, Hanyang University, 222 Wangsimni-Ro, Seongdong-Gu, Seoul 04763, Korea)

  • Min-Suk Jo

    (Department of Architectural Engineering, College of Engineering, Hanyang University, 222 Wangsimni-Ro, Seongdong-Gu, Seoul 04763, Korea)

  • Jae-Weon Jeong

    (Department of Architectural Engineering, College of Engineering, Hanyang University, 222 Wangsimni-Ro, Seongdong-Gu, Seoul 04763, Korea)

Abstract

The main objective of this research is to investigate the energy performance enhancement obtained by applying a heat pump to a liquid desiccant and indirect and direct evaporative cooling-assisted 100% outdoor air system (LD-IDECOAS). In conventional LD-IDECOAS operation, the boiler providing regeneration heat to the weak desiccant solution consumes most of the energy. In order to reduce the regeneration energy consumption in the LD-IDECOAS, a heat pump-integrated LD-IDECOAS (HPLD-IDECOAS) is suggested in this research. The heat pump reclaims waste heat from the absorber side of the system, and delivers the reclaimed heat to the regenerator side. Detailed energy simulations for both the LD-IDECOAS and HPLD-IDECOAS were conducted to analyze the energy saving potentiality of the proposed system over the conventional LD-IDECOAS. In both systems, it was assumed that a packed-bed type liquid desiccant unit with an aqueous solution of lithium chloride (LiCl) was used. In the proposed system, a heat pump with R-134a refrigerant was adopted. The results show that the proposed system was able to provide a 33% reduction in annual primary energy consumption compared with the conventional LD-IDECOAS. This significantly enhanced energy performance was mainly obtained through an 83% reduction in the gas energy consumed for regeneration of the desiccant solution in the proposed system by applying the heat pump.

Suggested Citation

  • Jang-Hoon Shin & Joon-Young Park & Min-Suk Jo & Jae-Weon Jeong, 2018. "Impact of Heat Pump-Driven Liquid Desiccant Dehumidification on the Energy Performance of an Evaporative Cooling-Assisted Air Conditioning System," Energies, MDPI, vol. 11(2), pages 1-21, February.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:2:p:345-:d:130014
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    References listed on IDEAS

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    1. Joon-Young Park & Jae-Weon Jeong, 2017. "Operating Energy Savings of a Liquid Desiccant and Evaporative Cooling-Assisted Air-Handling System in Marine Applications," Energies, MDPI, vol. 10(4), pages 1-19, April.
    2. Duk Joon Park & Ki Hyung Yu & Yong Sang Yoon & Kee Han Kim & Sun Sook Kim, 2015. "Analysis of a Building Energy Efficiency Certification System in Korea," Sustainability, MDPI, vol. 7(12), pages 1-22, December.
    3. Kim, Min-Hwi & Park, Jun-Seok & Jeong, Jae-Weon, 2013. "Energy saving potential of liquid desiccant in evaporative-cooling-assisted 100% outdoor air system," Energy, Elsevier, vol. 59(C), pages 726-736.
    4. Xiao, Fu & Ge, Gaoming & Niu, Xiaofeng, 2011. "Control performance of a dedicated outdoor air system adopting liquid desiccant dehumidification," Applied Energy, Elsevier, vol. 88(1), pages 143-149, January.
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    Cited by:

    1. Chang-Sheng Lin & Jui-Kai Liu & Hung-Tse Chiang, 2020. "A U-Shaped Oscillatory Liquid Piston Compression Air Conditioner Driven by Rotary Displacer Stirling Engine," Energies, MDPI, vol. 13(16), pages 1-15, August.
    2. 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.
    3. Su Liu & Sang-Tae No & Jae-Weon Jeong, 2019. "Energy Performance Comparison between Liquid-Desiccant-Assisted Air Conditioning System and Dedicated Outdoor Air System in Different Climatic Regions," Energies, MDPI, vol. 12(9), pages 1-27, May.
    4. Soo-Jin Lee & Hansol Lim & Jae-Weon Jeong, 2021. "Energy Benefit of Liquid Desiccant-Assisted Humidification in Buildings during Winter Operation," Energies, MDPI, vol. 14(5), pages 1-24, March.
    5. Beom-Jun Kim & Junseok Park & Jae-Weon Jeong, 2019. "Indoor Air Quality Enhancement Performance of Liquid Desiccant and Evaporative Cooling-Assisted Air Conditioning Systems," Sustainability, MDPI, vol. 11(4), pages 1-16, February.
    6. Hansol Lim & Seong-Yong Cheon & Jae-Weon Jeong, 2018. "Empirical Analysis for the Heat Exchange Effectiveness of a Thermoelectric Liquid Cooling and Heating Unit," Energies, MDPI, vol. 11(3), pages 1-14, March.
    7. Su Liu & Jae-Weon Jeong, 2020. "Energy Performance Comparison between Two Liquid Desiccant and Evaporative Cooling-Assisted Air Conditioning Systems," Energies, MDPI, vol. 13(3), pages 1-22, January.

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