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An optimised chemisorption cycle for power generation using low grade heat

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  • Bao, Huashan
  • Ma, Zhiwei
  • Roskilly, Anthony Paul

Abstract

The integration of chemisorption cycle with turbine/expander opens up enormous opportunities of recovering low grade heat to meet different energy demands including heating, cooling and power generation. In the present study, a novel advanced resorption power generation (RPG) cycle with reheating process has been proposed for the first time to significantly improve the thermal efficiency and exergy efficiency of the basic RPG cycle. Such a reheating concept is built on the premise of chemisorption monovariant characteristic and identification of the optimal desorption temperature aiming at producing the maximum work output under the given working conditions. The identified optimal desorption temperature might be lower than the available heat source temperature, and the desorbed ammonia vapour is subsequently reheated to the heat source temperature before it undergoes vapour expansion for power generation. This study explored the potential of the proposed advanced RPG cycle and investigated the system performance using three representative resorption sorbent pairs, including manganese chloride – sodium bromide, manganese chloride – strontium chloride, and strontium chloride – sodium bromide, all with ammonia as the refrigerant. The application of reheating concept can improve the total work output of RPG cycle by 10–600%, depending on different sorbent pairs and different heat source temperatures studied in this work, e.g., when the heat source temperature is at 200°C, the thermal efficiency is increased by 1.4–4.5 times and the exergy efficiency is boosted by 2.0–8.3 times. Another valuable merit of the proposed RPG cycle is that there is a great potential of considerable amount of additional cooling output without compromising the maximum work output, leading to further improvement of system efficiency. Compared to other bottoming cycles for power generations, the proposed advanced RPG cycle exhibits the highest thermal efficiency when the heat source temperature is between 120°C and 200°C.

Suggested Citation

  • Bao, Huashan & Ma, Zhiwei & Roskilly, Anthony Paul, 2017. "An optimised chemisorption cycle for power generation using low grade heat," Applied Energy, Elsevier, vol. 186(P3), pages 251-261.
    • Handle: RePEc:eee:appene:v:186:y:2017:i:p3:p:251-261
    DOI: 10.1016/j.apenergy.2016.06.080
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    References listed on IDEAS

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    5. Bao, Huashan & Ma, Zhiwei & Roskilly, Anthony Paul, 2017. "Chemisorption power generation driven by low grade heat – Theoretical analysis and comparison with pumpless ORC," Applied Energy, Elsevier, vol. 186(P3), pages 282-290.
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    Cited by:

    1. Ahmad Najjaran & Saleh Meibodi & Zhiwei Ma & Huashan Bao & Tony Roskilly, 2023. "Experimentally Validated Modelling of an Oscillating Diaphragm Compressor for Chemisorption Energy Technology Applications," Energies, MDPI, vol. 16(1), pages 1-17, January.
    2. Tamburini, A. & Tedesco, M. & Cipollina, A. & Micale, G. & Ciofalo, M. & Papapetrou, M. & Van Baak, W. & Piacentino, A., 2017. "Reverse electrodialysis heat engine for sustainable power production," Applied Energy, Elsevier, vol. 206(C), pages 1334-1353.
    3. Jiang, L. & Lu, Y.J. & Roskilly, A.P. & Wang, R.Z. & Wang, L.W. & Tang, K., 2018. "Exploration of ammonia resorption cycle for power generation by using novel composite sorbent," Applied Energy, Elsevier, vol. 215(C), pages 457-467.
    4. Wu, S. & Li, T.X. & Wang, R.Z., 2018. "Experimental identification and thermodynamic analysis of ammonia sorption equilibrium characteristics on halide salts," Energy, Elsevier, vol. 161(C), pages 955-962.
    5. Jiang, L. & Roskilly, A.P. & Wang, R.Z. & Wang, L.W., 2018. "Analysis on innovative resorption cycle for power and refrigeration cogeneration," Applied Energy, Elsevier, vol. 218(C), pages 10-21.
    6. Godefroy, Alexis & Perier-Muzet, Maxime & Mazet, Nathalie, 2020. "Novel hybrid thermochemical cycles for low-grade heat storage and autothermal power generation: A thermodynamic study," Applied Energy, Elsevier, vol. 270(C).
    7. Manente, Giovanni & Ding, Yulong & Sciacovelli, Adriano, 2021. "Organic Rankine cycles combined with thermochemical sorption heat transformers to enhance the power output from waste heat," Applied Energy, Elsevier, vol. 304(C).
    8. George H. Atkinson & Samuel Hinmers & Robert E. Critoph & Michel van der Pal, 2021. "Ammonium Chloride (NH 4 Cl)—Ammonia (NH 3 ): Sorption Characteristics for Heat Pump Applications," Energies, MDPI, vol. 14(18), pages 1-21, September.

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