Journal
INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID
Volume 58, Issue -, Pages 219-234Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrefrig.2015.06.016
Keywords
Absorption refrigeration; Two working pairs; LiCl-H2O; LiBr-H2O; Low-grade heat
Categories
Funding
- Natural Science Foundation of China [51376043]
- Foundation for Distinguished Young Scientists of Jiangsu Province [BK20140026]
- Foundation for the Author of National Excellent Doctoral Dissertation of PR China [201334]
- Scientific Research Foundation of Graduate School of Southeast University [3260635700]
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A novel low grade heat-driven absorption refrigeration system is proposed, where LiCl-H2O with higher vapor pressure is used in the high-pressure cycle and LiBr-H2O with lower vapor pressure is employed in the low-pressure cycle. Effects of key parameters on the system performance are analyzed, and different heat source utilization modes are considered: parallel modes (PM-1 and PM-2) and serial mode (SM). What's more, comparisons among the PM-1, PM-2, SM and the traditional double-stage LiBr-H2O absorption system (TDS) are made. Results show that the PM-1 has much higher COP than the TDS under small ranges of working conditions, with the maximum COP improvement 26.7%, while the PM-2 shows prominent advantages under wider ranges, with the maximum COP improvement 35%. In addition, The PM-1 shows much higher COP than the SM under higher condensing temperature and evaporation temperature, while the SM has much lower heat source outlet temperature which is at most 12 degrees C lower than that of the PM-1. The intermediate pressure is important for the system performance and the optimum value is 2.27 kPa in the PM-1 and 2.5 kPa in the SM. For the PM-2, the intermediate pressure should be chosen to achieve low circulation ratio in the low pressure cycle. (C) 2015 Elsevier Ltd and IIR. All rights reserved.
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