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Analysis of the Energy-Saving Effect of a Novel Central Air-Conditioning System with an Internal Heat Exchanger in Summer

Author

Listed:
  • Sensen Deng

    (School of Civil Engineering and Architecture, Anhui University of Technology, Ma’anshan 243002, China)

  • Dong Wang

    (School of Civil Engineering and Architecture, Anhui University of Technology, Ma’anshan 243002, China)

  • Kangkang Zhang

    (School of Civil Engineering and Architecture, Anhui University of Technology, Ma’anshan 243002, China)

  • Mengxue Li

    (School of Civil Engineering and Architecture, Anhui University of Technology, Ma’anshan 243002, China)

  • Yuehong Lu

    (School of Civil Engineering and Architecture, Anhui University of Technology, Ma’anshan 243002, China)

Abstract

In this paper, a novel central air-conditioning system with an internal heat exchanger is proposed and analyzed for its energy-saving effect. Two frequently used systems are chosen as the reference systems, i.e., a conventional system with a sensible heat exchanger (Reference System I) and a conventional system with a total heat exchanger (Reference System II). Analysis models are built to simulate the performance of the system. The energy-saving effects of the proposed system and the two reference systems under different conditions are theoretically calculated using a case-studied shopping mall in Nanjing, China. The results show that the influence of indoor relative humidity (RH) on the energy-saving effect is much greater than that of the indoor design temperature. Indoor design parameters have a greater impact on energy saving than outdoor design parameters. Under the studied conditions, the maximum energy-saving rates of the proposed system, Reference System I, and Reference System II, are 52.7%, 2.3%, and 12.1%, respectively. With the decrease in fresh-air ratio from 70% to 20%, the difference in energy-saving rates between the proposed system and Reference System II (Reference System I) can increase from 5% to 23% (15% to 30%). Therefore, the proposed system has obvious energy-saving potential and advantage, especially under the condition of a lower fresh-air ratio.

Suggested Citation

  • Sensen Deng & Dong Wang & Kangkang Zhang & Mengxue Li & Yuehong Lu, 2024. "Analysis of the Energy-Saving Effect of a Novel Central Air-Conditioning System with an Internal Heat Exchanger in Summer," Sustainability, MDPI, vol. 16(13), pages 1-20, June.
    • Handle: RePEc:gam:jsusta:v:16:y:2024:i:13:p:5534-:d:1424794
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    References listed on IDEAS

    as
    1. Xie, Kang & Hui, Hongxun & Ding, Yi & Song, Yonghua & Ye, Chengjin & Zheng, Wandong & Ye, Shuiquan, 2022. "Modeling and control of central air conditionings for providing regulation services for power systems," Applied Energy, Elsevier, vol. 315(C).
    2. Song, Xia & Zhang, Lun & Zhang, Xiaosong, 2018. "NTUm-based optimization of heat or heat pump driven liquid desiccant dehumidification systems regenerated by fresh air or return air," Energy, Elsevier, vol. 158(C), pages 269-280.
    3. Yang, C.M. & Chen, C.C. & Chen, S.L., 2013. "Energy-efficient air conditioning system with combination of radiant cooling and periodic total heat exchanger," Energy, Elsevier, vol. 59(C), pages 467-477.
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