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SIMULATION ANALYSIS OF PERFORMANCE OPTIMIZATION OF GAS-DRIVEN AMMONIA-WATER ABSORPTION HEAT PUMP

ABSTRACT
The generator-absorber heat exchange ammonia-water absorption heat pump has a relatively high efficiency and the COP is improved by recovering internal heat. In order to resolve the problem that generator-absorber heat exchange effect becomes less obvious or even fails under the working condition of large temperature lift, a novel system is proposed to recover the rectification heat and absorption heat by solution split method. Compared with the method of using total strong solution to recover absorption heat after extracting rectification heat, the method of solution split avoids the problem of high temperature of inlet strong solution of the solution cooled absorber, and improves the internal heat recovery capacity of the system. When using solution split method to recover the rectification heat and absorption heat, the solution split ratio K has an important influence on the system performance. This paper will theoretically study the selection range of the solution split ratio K and the effect of evaporation temperature, cooling water temperature and generation temperature on the optimum split ratio K. Compared to the system that uses the total strong solution to recover the rectification heat and absorption heat, the performance of the novel system is significantly improved, and the novel system performance coefficient can be increased by up to 15.7%.
KEYWORDS
PAPER SUBMITTED: 2019-11-10
PAPER REVISED: 2020-01-18
PAPER ACCEPTED: 2020-01-24
PUBLISHED ONLINE: 2020-02-08
DOI REFERENCE: https://doi.org/10.2298/TSCI191110063Z
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2020, VOLUME 24, ISSUE Issue 6, PAGES [4253 - 4266]
REFERENCES
  1. ***, National Energy Administration Winter Clean Heating Planning in the North (2017-2021) (in Chinese), 2017
  2. Wu, W., et al., Design and Theoretical Analysis of Ammonia-Water Air Source Absorption Heat Pump (in Chinese), Proceedings, Celebrating the 30th Anniversary of the Beijing Refrigeration Society and the Annual Academic Conference, Bejing, China, 2010
  3. Chen, X., et al., Heat Integration of Ammonia-Water Absorption Refrigeration System Through Heat-Exchanger Network Analysis, Energy, 141 (2017), Dec., pp. 1585-1599
  4. Jaballah, M. B et al., Enhancement of the Performance of Bubble Absorber Using Hybrid Nanofluid as a Cooled Absorption System, International Journal of Numerical Methods for Heat and Fluid Flow, 31 (2019), 4, pp. 3857-3871
  5. Ben Hamida, J., et al., Numerical Study of Heat and Mass Transfer Enhancement for Bubble Absorption Process of Ammonia-Water Mixture Without and with Nanofluid, Thermal Science, 22 (2019), 6B, pp. 3107-3120
  6. Jawahar, C. P., Saravanan, R., Generator Absorber Heat Exchange Based Absorption Cycle – A Review, Renewable and Sustainable Energy Reviews, 14 (2010), 8, pp. 2372-2382
  7. Jawahar, C. P., Saravanan, R., Experimental Studies on Air-Cooled NH3-H2O Based Modified GAS Absorption Cooling System, International Journal of Refrigeration, 34 (2011), 3, pp. 658-666
  8. Chen, G., et al., Theoretical Performance Analysis of an Improved Absorption-Compression Hybrid GAX Refrigeration Cycle (in Chinese), Proceedings, CSEE, 36 (2016), 12, pp. 3250-3255
  9. Fernandez-Seara, J., Sieres, J., The Importance of the Ammonia Purification Process in Ammonia-Water Absorption Systems, Energy Conversion & Management, 47 (2006), 13, pp. 1975-1987
  10. Liao, J., Performance Analysis of Ammonia Water Absorption Refrigeration GAX Cycle (in Chinese), Ph. D. thesis, Southeast University, Nanjing, China, 2004
  11. Sun, S., Du, W., Analysis of the Influence of Ammonia Distillation Purity on the Performance of Ammonia Absorption Refrigeration System (in Chinese), Refrigeration Technology, 38 (2018), 161, pp. 14-18
  12. Du, S., et al., Optimal Ammonia Water Absorption Refrigeration Cycle with Maximum Internal Heat Recovery Derived from Pinch Technology, Energy, 68 (2014), Apr., pp. 862-869
  13. Chen, X., et al., An Improved Cycle for Large Temperature Lifts Application in Water-Ammonia Absorption System, Energy, 118 (2016), Jan., pp. 1361-1369
  14. Wu, W., et al., NH3-H2O Water Source Absorption Heat Pump (WSAHP) for Low Temperature Heating: Experimental Investigation on the Off-Design Performance, Energy, 115 (2016), Part 1, pp. 697-710

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