On the performance improvement of an inverted Brayton Cycle using a regenerative heat and mass exchanger

Kohei Matsui, Jie Lin, Kyaw Thu, Takahiko Miyazaki

研究成果: ジャーナルへの寄稿学術誌査読

1 被引用数 (Scopus)

抄録

Recovery of the low-temperature waste heat for electricity generation has been gaining a significant interest. An Inverted Brayton Cycle (IBC) is often employed to convert the low-temperature waste-heat to electricity while the thermal efficiency and specific work output are poor. In this paper, a new energy recovery scheme is introduced incorporating the IBC with a Regenerative Heat and Mass Exchanger (RHME). The RHME is a heat and mass exchanger that consolidates a recuperator (for thermal efficiency improvement) and an Indirect Evaporative Cooler (for enhanced specific work). Numerical models for RHME and the IBC were judiciously developed where possible condensation in the product air channel was accounted for. The model was validated with the experimental data and the cycle was investigated for various waste-heat sources (50–150 °C). When compared to a conventional air-cooling IBC system, incorporating the current energy recovery scheme increases the thermal efficiency from 8.13% to 14.36% and specific work output from 10.38 to 12.46 kJ/kg equivalent to 76.63% and 20.1% improvements, respectively. The unprecedented performance improvement is realised from the exploitation of the regenerative and air-saturation (cooling) mechanisms for both energy recovery and cooling of the working fluid.

本文言語英語
論文番号123726
ジャーナルEnergy
249
DOI
出版ステータス出版済み - 6月 15 2022

!!!All Science Journal Classification (ASJC) codes

  • 土木構造工学
  • 建築および建設
  • モデリングとシミュレーション
  • 再生可能エネルギー、持続可能性、環境
  • 燃料技術
  • エネルギー工学および電力技術
  • 汚染
  • エネルギー一般
  • 機械工学
  • 産業および生産工学
  • マネジメント、モニタリング、政策と法律
  • 電子工学および電気工学

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