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<p>In order to efficiently recover industrial ultra-low-grade waste heat, a thermal-mass coupled hybrid absorption-compression heat pump (TMCHACHP) system is proposed. The system integrates a mass-coupled absorption-compression sub-cycle using H<sub>2</sub>O/LiBr with a vapor-compression sub-cycle using a zeotropic mixture of R134a/R245fa. The generator of the absorption cycle and the condenser of the compression cycle are thermally coupled, resulting in a compact structure and improved thermodynamic performance. The thermodynamic models have been developed and parametric studies show that the proposed system can produce hot water at 145°C with a high coefficient of performance (COP) of 3.57. The coupled heat exchanger and absorber are identified as the major sources of exergy destruction, contributing 153.93 kW (33.25%) and 112.75 kW (24.0%), respectively, which provides guidance for further system improvement. This TMCHACHP system provides a feasible approach for the efficient utilization of ultra-low-grade heat sources and shows promising potential for high-temperature industrial heat supply.</p>

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Hybrid Absorption-Compression Heat Pump based on Thermal and Mass Coupling for Recovery of Ultra-Low-Grade Heat

  • 期刊论文

  • 发表日期：

    2026年7月21日

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  • Jian Sun,
  • Yunrong Hu,
  • Zihao Gu,
  • Jianhao Xue,
  • Minhui Liu,
  • Zhiwu Hu,
  • Xiaoze Du

摘要

In order to efficiently recover industrial ultra-low-grade waste heat, a thermal-mass coupled hybrid absorption-compression heat pump (TMCHACHP) system is proposed. The system integrates a mass-coupled absorption-compression sub-cycle using H2O/LiBr with a vapor-compression sub-cycle using a zeotropic mixture of R134a/R245fa. The generator of the absorption cycle and the condenser of the compression cycle are thermally coupled, resulting in a compact structure and improved thermodynamic performance. The thermodynamic models have been developed and parametric studies show that the proposed system can produce hot water at 145°C with a high coefficient of performance (COP) of 3.57. The coupled heat exchanger and absorber are identified as the major sources of exergy destruction, contributing 153.93 kW (33.25%) and 112.75 kW (24.0%), respectively, which provides guidance for further system improvement. This TMCHACHP system provides a feasible approach for the efficient utilization of ultra-low-grade heat sources and shows promising potential for high-temperature industrial heat supply.