Performance study of ejector cooling cycle at critical mode under superheated primary flow
Performance study of ejector cooling cycle at critical mode under superheated primary flow
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DOI：
10.1016/j.enconman.2015.01.039
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发表时间：
2015-04-01
影响因子：
10.4
通讯作者：
Al-Rifai, Saja
中科院分区：
文献类型：
--
作者：
Tashtoush, Bourhan;Alshare, Aiman;Al-Rifai, Saja
在这项工作中，喷射器冷却循环的性能进行了研究，在临界模式，其中，喷射器的几何形状，制冷剂类型和操作条件的影响进行了研究。采用EES软件对喷射器冷却循环进行建模。应用质量守恒、动量守恒和能量守恒原理研究了一次流和二次流在过热状态下的喷射器冷却循环性能，并根据其环境特性和性能特点选择了R134 a。制冷循环中的主工作流体保持在过热条件下，以获得最佳喷射器性能。太阳能发电机的温度范围是80-100摄氏度。蒸发器的工作温度范围为8-12 ℃，最佳冷凝温度范围为28-40 ℃。结果表明，在相同的引射比和COP下，定压混合引射器比定面积混合引射器产生更高的背压。根据临界背压和一次流阻塞条件的性能指标选择了喷射器的类型，EJ 2型喷射器满足这些性能指标。由于较高的临界冷凝器压力和较高的发生器温度，在冷凝器背压为24巴时，发现COP在0.59-0.67的范围内。(C)2015爱思唯尔有限公司版权所有。
In this work the performance of the ejector cooling cycle is investigated at critical mode, where, the effects of ejector geometry, refrigerant type, and operating condition are studied. The ejector cooling cycle is modeled with EES Software. The mass, momentum, and energy conservation principles are applied to the secondary and primary flows to investigate the performance of the ejector cooling cycle under superheated primary flow.The refrigerant R134 a is selected based on the merit of its environmental and performance characteristics. The primary working fluid in the refrigeration cycle is maintained at superheated conditions for optimal ejector performance. The solar generator temperature ranges are 80-100 degrees C. The operating temperature of evaporator range is 8-12 degrees C and the optimal condensation temperature is in the range of 28-40 degrees C. It is found that constant-pressure mixing ejector generates higher backpressure than constant-area mixing ejector for the same entrainment ratio and COP. The type of ejector is selected based on the performance criteria of the critical backpressure and choking condition of the primary flow, the so called EJ2 type ejector meets the criteria. The COP is found to be in the range of 0.59-0.67 at condenser backpressure of 24 bar due to higher critical condenser pressure and higher generator temperature. (C) 2015 Elsevier Ltd. All rights reserved.