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Modeling and experimental investigation of an advanced direct-expansion outdoor air dehumidification system

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  • Zhang, Zi-Yang
  • Cao, Xiang
  • Yang, Zhi
  • Shao, Liang-Liang
  • Zhang, Chun-Lu

Abstract

Dedicated outdoor air system is drawing much attention in air-conditioning applications. However, the cooling and dehumidification process of supply air in the dedicated outdoor air system is energy-intensive. In this study, we proposed a highly energy efficient dedicated outdoor air system using novel vapor-compression refrigeration cycle which is featured by a fine combination of two-stage direct-expansion dehumidification, subcooled liquid-to-air reheating, and exhaust air heat recovery. The novel system was optimally designed and analyzed with a detailed mathematical model. A prototype was also made and tested. Test results showed that the energy efficiency of the proposed system reaches 5.42 under rated cooling conditions and 26% higher than the conventional one. The model accuracy was also validated with the measured data. Moreover, energy efficiency improvement from feature technologies was numerically analyzed. Control strategy for key operating parameters was developed and illustrated. System performance under varying operating conditions was evaluated as well.

Suggested Citation

  • Zhang, Zi-Yang & Cao, Xiang & Yang, Zhi & Shao, Liang-Liang & Zhang, Chun-Lu, 2019. "Modeling and experimental investigation of an advanced direct-expansion outdoor air dehumidification system," Applied Energy, Elsevier, vol. 242(C), pages 1600-1612.
    • Handle: RePEc:eee:appene:v:242:y:2019:i:c:p:1600-1612
    DOI: 10.1016/j.apenergy.2019.02.080
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    References listed on IDEAS

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    1. Zhang, L.Z., 2006. "Energy performance of independent air dehumidification systems with energy recovery measures," Energy, Elsevier, vol. 31(8), pages 1228-1242.
    2. Shao, Liang-Liang & Yang, Liang & Zhang, Chun-Lu, 2010. "Comparison of heat pump performance using fin-and-tube and microchannel heat exchangers under frost conditions," Applied Energy, Elsevier, vol. 87(4), pages 1187-1197, April.
    3. Xiong, Z.Q. & Dai, Y.J. & Wang, R.Z., 2010. "Development of a novel two-stage liquid desiccant dehumidification system assisted by CaCl2 solution using exergy analysis method," Applied Energy, Elsevier, vol. 87(5), pages 1495-1504, May.
    4. Tu, Rang & Liu, Xiao-Hua & Jiang, Yi, 2014. "Performance analysis of a two-stage desiccant cooling system," Applied Energy, Elsevier, vol. 113(C), pages 1562-1574.
    5. Chua, K.J. & Chou, S.K. & Yang, W.M. & Yan, J., 2013. "Achieving better energy-efficient air conditioning – A review of technologies and strategies," Applied Energy, Elsevier, vol. 104(C), pages 87-104.
    6. Ge, Gaoming & Xiao, Fu & Xu, Xinhua, 2011. "Model-based optimal control of a dedicated outdoor air-chilled ceiling system using liquid desiccant and membrane-based total heat recovery," Applied Energy, Elsevier, vol. 88(11), pages 4180-4190.
    7. 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.
    8. Liang, Cai-Hang & Zhang, Li-Zhi & Pei, Li-Xia, 2010. "Performance analysis of a direct expansion air dehumidification system combined with membrane-based total heat recovery," Energy, Elsevier, vol. 35(9), pages 3891-3901.
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    Cited by:

    1. Yang, Liu & Weng, Wenbing & Deng, Shiming, 2020. "A modeling study on a direct expansion based air conditioner having a two-sectioned cooling coil," Applied Energy, Elsevier, vol. 278(C).

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