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Waste Heat Driven Multi-Ejector Cooling Systems: Optimization of Design at Partial Load; Seasonal Performance and Cost Evaluation

Author

Listed:
  • Luca Viscito

    (Department of Industrial Engineering, Federico II University of Naples P. le Tecchio 80, 80125 Naples, Italy)

  • Gianluca Lillo

    (Department of Industrial Engineering, Federico II University of Naples P. le Tecchio 80, 80125 Naples, Italy)

  • Giovanni Napoli

    (Department of Industrial Engineering, Federico II University of Naples P. le Tecchio 80, 80125 Naples, Italy)

  • Alfonso William Mauro

    (Department of Industrial Engineering, Federico II University of Naples P. le Tecchio 80, 80125 Naples, Italy)

Abstract

In this paper, a seasonal performance analysis of a hybrid ejector cooling system is carried-out, by considering a multi-ejector pack as expansion device. A 20 kW ejector-based chiller was sized to obtain the optimal tradeoff between performance and investment costs. The seasonal performance of the proposed solution was then evaluated through a dynamic simulation able to obtain the performance of the designed chiller with variable ambient temperatures for three different reference climates. The optimized multi-ejector system required three or four ejectors for any reference climate and was able to enhance the system performance at partial load, with a significant increase (up to 107%) of the seasonal energy efficiency ratio. The proposed system was then compared to conventional cooling technologies supplied by electric energy (electrical chillers EHP) or low-grade heat sources (absorption chillers AHP) by considering the total costs for a lifetime of 20 years and electric energy-specific costs for domestic applications from 0.10 to 0.50 €/kWhel. The optimized multi-ejector cooling system presented a significant convenience with respect to both conventional technologies. For warmer climates and with high electricity costs, the minimum lifetime for the multi-ejector system to achieve the economic break-even point could be as low as 1.9 years.

Suggested Citation

  • Luca Viscito & Gianluca Lillo & Giovanni Napoli & Alfonso William Mauro, 2021. "Waste Heat Driven Multi-Ejector Cooling Systems: Optimization of Design at Partial Load; Seasonal Performance and Cost Evaluation," Energies, MDPI, vol. 14(18), pages 1-25, September.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:18:p:5663-:d:631914
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    References listed on IDEAS

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    1. Szabolcs Varga & Pedro S. Lebre & Armando C. Oliveira, 2015. "Readdressing working fluid selection with a view to designing a variable geometry ejector," International Journal of Low-Carbon Technologies, Oxford University Press, vol. 10(3), pages 205-215.
    2. Besagni, Giorgio & Mereu, Riccardo & Inzoli, Fabio, 2016. "Ejector refrigeration: A comprehensive review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 53(C), pages 373-407.
    3. Gianluca Lillo & Rita Mastrullo & Alfonso William Mauro & Raniero Trinchieri & Luca Viscito, 2020. "Thermo-Economic Analysis of a Hybrid Ejector Refrigerating System Based on a Low Grade Heat Source," Energies, MDPI, vol. 13(3), pages 1-24, January.
    4. Sun, Da-Wen, 1996. "Variable geometry ejectors and their applications in ejector refrigeration systems," Energy, Elsevier, vol. 21(10), pages 919-929.
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