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Performance improvement of absorption heat transformer

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  • Sözen, Adnan
  • Yücesu, H. Serdar

Abstract

In this study, a mathematical model of absorption heat transformer (AHT) operating with the aqua/ammonia was developed to simulate the performance of these systems coupled to a solar pond in order to increase the temperature of the useful heat produced by solar ponds and used a special ejector located at the absorber inlet. By the use of the ejector, the obtained absorber pressure becomes higher than the evaporator pressure and thus the system works with triple-pressure-level. The ejector has two functions: (i) aids pressure recovery from the evaporator and (ii) upgrades the mixing process and the pre-absorption by the weak solution of the ammonia coming from the evaporator. The other advantage of the system with ejector is increased absorber temperature. Therefore, pressure recovery and pre-absorption in the ejector improves the efficiency of the AHT. Under the same circumstances, when compared to an AHT with and without an ejector, the system's COP and exergetic coefficient of performance (ECOP) were improved by 14% and 30%, respectively and the circulation ratio (f) was reduced by 57% at the maximum efficiency condition. Due to the reduced circulation ratio, the system dimensions can be reduced; consequently, this decreases overall cost. The maximum upgrading of the solar pond's temperature by the AHT was obtained at 57.5°C and gross temperature lift at 97.5°C with coefficients of performance of about 0.5. The maximum temperature of the useful heat produced by the AHT was ∼150°C. In addition, exergy losses for each component in the system were calculated at different working temperatures and the results of both systems with and without an ejector were compared. Exergy analysis emphasised that both the losses and irreversibilities have an impact on the system performance and exergy analysis can be used to identify the less efficient components of the system. Exergy analyses also showed that the exergy loss of the absorber of AHT with ejector was higher than those of other components.

Suggested Citation

  • Sözen, Adnan & Yücesu, H. Serdar, 2007. "Performance improvement of absorption heat transformer," Renewable Energy, Elsevier, vol. 32(2), pages 267-284.
    • Handle: RePEc:eee:renene:v:32:y:2007:i:2:p:267-284
    DOI: 10.1016/j.renene.2006.01.017
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    References listed on IDEAS

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    1. 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.
    2. Shi, Lin & Yin, Juan & Wang, Xin & Zhu, Ming-Shan, 2001. "Study on a new ejection-absorption heat transformer," Applied Energy, Elsevier, vol. 68(2), pages 161-171, February.
    3. 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.
    4. Ravikumar, T.S. & Suganthi, L. & Samuel, Anand A., 1998. "Exergy analysis of solar assisted double effect absorption refrigeration system," Renewable Energy, Elsevier, vol. 14(1), pages 55-59.
    5. 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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    1. S. Mohammad S. Mahmoudi & Sina Salehi & Mortaza Yari & Marc A. Rosen, 2017. "Exergoeconomic Performance Comparison and Optimization of Single-Stage Absorption Heat Transformers," Energies, MDPI, vol. 10(4), pages 1-28, April.
    2. Horuz, Ilhami & Kurt, Bener, 2010. "Absorption heat transformers and an industrial application," Renewable Energy, Elsevier, vol. 35(10), pages 2175-2181.

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