Effect of Ejector Location in Absorption Refrigeration Cycles Using Different Binary Working Fluids

被引:8
作者
Yosaf, Salem [1 ]
Ozcan, Hasan [2 ,3 ]
机构
[1] Karabuk Univ, Mech Engn Dept, Fac Engn, Demir Celik Kampusu, TR-78050 Karabuk, Turkey
[2] Karabuk Univ, Iron & Steel Inst, Demir Celik Kampusu, TR-78050 Karabuk, Turkey
[3] Yildirim Beyazit Univ, Fac Engn & Nat Sci, TR-06220 Ankara, Turkey
关键词
Absorption refrigeration cycle; ejector; exergy efficiency; coefficient of performance; cycle circulation ratio; ejector compression ratio; EXERGY ANALYSIS; PERFORMANCE; WATER; TEMPERATURE; SYSTEM; ENERGY; R125; FLOW;
D O I
10.1142/S2010132519500032
中图分类号
O414.1 [热力学];
学科分类号
摘要
In this study, three novel modifications of ejector-absorption refrigeration cycles (E-ARC) are investigated to evaluate the effect of ejector location on cycle performances. In the first modification (triple pressure level absorption refrigeration cycle TPL-ARC), the ejector is located at the evaporator inlet. In the second modification (double ejector absorption refrigeration cycle DE-ARC), two ejectors are used; one is located at the evaporator inlet and the other at the absorber inlet, which are coupled to each other. In the third modification (low pressure condenser absorption refrigeration cycle LPC-ARC), the steam ejector is installed at the downstream of the vapor generator discharging line. An additional flow splitter is integrated to the steam ejector outlet and part of the vapor is extracted and returned to the absorber at a pressure equal to the diffuser pressure. Effect of ejector location on thermodynamic performances are evaluated considering three different working fluids, namely ammonia water solution (NH3 H20), lithium bromide-water solution (H2O LiBr), and lithium chloride water solution (H2O LiC1). Even though all three configurations enhance the conventional absorption refrigeration cycle (C-ARC) performances, the LPC-ARCs work at high temperature and improve the cycle performance. The TPL-ARC proves to improve the COP and exergy efficiency up to 9.14% and 7.61%, respectively, presenting the highest thermodynamic performance enhancement and lowest operating temperature.
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页数:17
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