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Emergy evaluation of a solar-powered cascade system for dehumidification, cooling and heating in hot summer and cold winter areas of China

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  • Xu, Aixiang
  • Wang, Yizhang
  • Song, Tingting
  • Xiong, Yawen
  • Liu, Zhiqiang
  • Yang, Sheng

Abstract

A solar-powered cascade system is proposed for dehumidification, cooling and heating in hot summer and cold winter areas of China. To evaluate the energy, environmental and economic sustainability of the system, the emergy evaluation of the proposed system is analyzed and compared with different energy sources. The effects of solar radiation intensity, air temperature and relative humidity on the emergy performance of the system are discussed. The results show that the input total emergy and transformity of the proposed system are 9.88 × 1016 sej/y and 4.75 × 105 sej/J, which are lower than that of the systems powered by other energy. The environmental load ratio and emergy sustainability index are the highest when the system is powered by solar energy, with the value reaching 1.33 and 1.66, respectively. According to parameter sensitivity analysis, the total emergy input decreases by 6.31% and the emergy saving ratio increases by 29.09% as the increase of solar radiation intensity. The system has the best emergy performance at air temperature of 26.18 °C. The system has lower environmental load and higher sustainability in lower relative humidity climate. This work proves the viability and sustainability of the novel cascade system.

Suggested Citation

  • Xu, Aixiang & Wang, Yizhang & Song, Tingting & Xiong, Yawen & Liu, Zhiqiang & Yang, Sheng, 2023. "Emergy evaluation of a solar-powered cascade system for dehumidification, cooling and heating in hot summer and cold winter areas of China," Energy, Elsevier, vol. 278(PB).
    • Handle: RePEc:eee:energy:v:278:y:2023:i:pb:s0360544223014512
    DOI: 10.1016/j.energy.2023.128057
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    References listed on IDEAS

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