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Performance evaluation of a dual-core heating R290 heat pump system based on RSM and NSGA-II.

Author(s) : MIAO Y., LI M., LI X., WANG J., QIN Z., TANG X.

Type of article: IJR article

Summary

This study presents a systematic experimental and simulation investigation of a novel R290-based dual-core heating heat pump system under low-temperature conditions. The system maintains a stable cabin supply air temperature of 45 C within an ambient temperature range of -5 ◦ C to -15 ◦ C, while the coefficient of perfor mance (COP) decreases with lower ambient temperature and higher inlet air velocity, reaching a maximum reduction of 24.5 %. Exergy analysis shows that increasing inlet air velocity from 3 m/s to 4 m/s raises exergy destruction by 0.36–0.45 kW and reduces exergy efficiency by 0.45 %–2.69 %, with the compressor contributing up to 45.37 % of exergy destruction. A lumped-parameter mechanistic model is developed and validated, yielding maximum relative errors of 2.07 % for heating capacity and 1.72 % for COP. Response Surface Meth odology based on the Box-Behnken Design establishes quadratic models with R² > 0.96, outperforming Central Composite Design. The results indicate that heating capacity is primarily governed by ambient temperature and compressor speed, increasing from 5.0 kW to 5.6 kW as ambient temperature rises from -20 ◦ C to -5 ◦ C, and from 4.8 kW to 5.2 kW as compressor speed increases from 6000 rpm to 8000 rpm. Meanwhile, exergy efficiency decreases from 35 % to 15 % and from 24 % to 19 %, respectively. Finally, a Comprehensive Performance Evaluation Model successfully quantifies this multi-objective trade-off, indicating that a 0.789 kW increase in heating capacity comes at the expense of a 16.5 % drop in exergy efficiency. This reveals that a moderate reduction in heating capacity under extreme cold conditions favors overall energy utilization.

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Details

  • Original title: Performance evaluation of a dual-core heating R290 heat pump system based on RSM and NSGA-II.
  • Record ID : 30034847
  • Languages: English
  • Subject: Technology
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 187
  • Publication date: 2026/07
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2026.106957

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