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Performance of a triple-pressure-level absorption cycle with R125-N,N'-dimethylethylurea

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  • Jelinek, M.
  • Levy, A.
  • Borde, I.

Abstract

In the developed triple-pressure-level (TPL) single stage absorption cycle, a specially designed jet ejector was introduced at the absorber inlet. The device served two major functions: it facilitated pressure recovery and improved the mixing between the weak solution and the refrigerant vapour coming from the evaporator. These effects enhanced the absorption of the refrigerant vapour into the solution drops. To facilitate the design of the jet ejector for such absorption machines, a numerical model of simultaneous heat-and-mass transfers between the liquid and the gas phases in the ejector was developed. The refrigerant pentafluoroethane (R125) and the absorbent N,N'-dimethylethylurea (DMEU) were used as the working fluid. A computerized simulation program was used to perform a parametric study of the TPL absorption cycle. The influence of the jet ejector on the performance of the TPL absorption cycle was evaluated, and the performance of the TPL absorption cycle was compared with that of a double-pressure level (DPL) cycle. Four cases were studied that represent the improvements in the TPL absorption cycle performances as a result of the incorporation of the jet ejector. The four cases are: the ability to reduce the circulation ratio f, the ability to lower the evaporator temperature, the ability to lower the generator temperature and the ability to use higher-temperature cooling water.

Suggested Citation

  • Jelinek, M. & Levy, A. & Borde, I., 2002. "Performance of a triple-pressure-level absorption cycle with R125-N,N'-dimethylethylurea," Applied Energy, Elsevier, vol. 71(3), pages 171-189, March.
    • Handle: RePEc:eee:appene:v:71:y:2002:i:3:p:171-189
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    References listed on IDEAS

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    1. Chen, Li-Ting, 1988. "A new ejector-absorber cycle to improve the COP of an absorption refrigeration system," Applied Energy, Elsevier, vol. 30(1), pages 37-51.
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    1. Besagni, Giorgio & Mereu, Riccardo & Inzoli, Fabio, 2016. "Ejector refrigeration: A comprehensive review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 53(C), pages 373-407.
    2. Sözen, Adnan & Yücesu, H. Serdar, 2007. "Performance improvement of absorption heat transformer," Renewable Energy, Elsevier, vol. 32(2), pages 267-284.
    3. Fan, Hongming & Shao, Shuangquan & Tian, Changqing, 2014. "Performance investigation on a multi-unit heat pump for simultaneous temperature and humidity control," Applied Energy, Elsevier, vol. 113(C), pages 883-890.
    4. Orian, G. & Jelinek, M. & Levy, A., 2010. "Flow boiling of binary solution in horizontal tube," Energy, Elsevier, vol. 35(1), pages 35-44.
    5. Li, Huashan & Cao, Fei & Bu, Xianbiao & Wang, Lingbao & Wang, Xianlong, 2014. "Performance characteristics of R1234yf ejector-expansion refrigeration cycle," Applied Energy, Elsevier, vol. 121(C), pages 96-103.
    6. Vereda, C. & Ventas, R. & Lecuona, A. & Venegas, M., 2012. "Study of an ejector-absorption refrigeration cycle with an adaptable ejector nozzle for different working conditions," Applied Energy, Elsevier, vol. 97(C), pages 305-312.
    7. Levy, A. & Jelinek, M. & Borde, I., 2002. "Numerical study on the design parameters of a jet ejector for absorption systems," Applied Energy, Elsevier, vol. 72(2), pages 467-478, June.
    8. Chen, Jianyong & Jarall, Sad & Havtun, Hans & Palm, Björn, 2015. "A review on versatile ejector applications in refrigeration systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 49(C), pages 67-90.
    9. Levy, A. & Jelinek, M. & Borde, I. & Ziegler, F., 2004. "Performance of an advanced absorption cycle with R125 and different absorbents," Energy, Elsevier, vol. 29(12), pages 2501-2515.
    10. Sözen, Adnan & Kurt, Mustafa & Akçayol, M.Ali & Özalp, Mehmet, 2004. "Performance prediction of a solar driven ejector-absorption cycle using fuzzy logic," Renewable Energy, Elsevier, vol. 29(1), pages 53-71.
    11. Abed, Azher M. & Alghoul, M.A. & Sopian, K. & Majdi, Hasan Sh. & Al-Shamani, Ali Najah & Muftah, A.F., 2017. "Enhancement aspects of single stage absorption cooling cycle: A detailed review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 77(C), pages 1010-1045.
    12. Papadopoulos, Athanasios I. & Kyriakides, Alexios-Spyridon & Seferlis, Panos & Hassan, Ibrahim, 2019. "Absorption refrigeration processes with organic working fluid mixtures- a review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 109(C), pages 239-270.
    13. Sözen, Adnan & Özalp, Mehmet, 2005. "Solar-driven ejector-absorption cooling system," Applied Energy, Elsevier, vol. 80(1), pages 97-113, January.
    14. Garousi Farshi, L. & Mosaffa, A.H. & Infante Ferreira, C.A. & Rosen, M.A., 2014. "Thermodynamic analysis and comparison of combined ejector–absorption and single effect absorption refrigeration systems," Applied Energy, Elsevier, vol. 133(C), pages 335-346.
    15. Sun, Fangtian & Fu, Lin & Sun, Jian & Zhang, Shigang, 2014. "A new ejector heat exchanger based on an ejector heat pump and a water-to-water heat exchanger," Applied Energy, Elsevier, vol. 121(C), pages 245-251.
    16. Le Lostec, Brice & Galanis, Nicolas & Baribeault, Jean & Millette, Jocelyn, 2008. "Wood chip drying with an absorption heat pump," Energy, Elsevier, vol. 33(3), pages 500-512.

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