A general model for evaluation of vapor ejectors performance for application in refrigeration
A general model for evaluation of vapor ejectors performance for application in refrigeration
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DOI：
10.1016/j.enconman.2012.05.009
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发表时间：
2012-12-01
影响因子：
10.4
通讯作者：
Colle, Sergio
中科院分区：
文献类型：
--
作者：
Cardemil, Jose M.;Colle, Sergio
在喷射器制冷系统中，喷射器的性能是确定性能系数，制冷能力，组件大小和整个系统成本的关键因素。大多数先前发表的数学模型，以预测弹出器的性能考虑理想的气体流体。本文提出了一种新方法，该方法考虑了理想和真实气体。使用实际气体方程式的使用可以考虑干燥或湿蒸气的工作流体。对于湿蒸气排出器，考虑了一种用于计算两相混合物中声速的弛豫模型的窒息现象。通过将预测结果与文献中可用的实验数据进行比较，使用三种不同的工作流体，即R141b，Steam和二氧化碳，可以验证该模型的有效性。发现该结果与实验数据非常吻合，并且比应用先前发布模型获得的估计更好。 （c）2012 Elsevier Ltd.保留所有权利。
In ejector refrigeration systems, the performance of the ejector is a crucial factor in determining the coefficient of performance, refrigeration power, component size and cost of the whole system. Most of the previously published mathematical models to predict the performance of ejectors consider ideal gas fluids. This paper presents a new approach which takes into account both ideal and real gases. The use of real gas equations of state enables considering either dry or wet vapor working fluids. For wet vapor ejectors, the choking phenomenon is analyzed considering a relaxation model for the calculation of the speed of sound in two-phase mixtures. The effectiveness of the model is verified by comparing the predicted results with experimental data available in the literature, using three different working fluids namely R141b, steam, and carbon dioxide. The results were found to be in good agreement with the experimental data and better than the estimations obtained applying previously published models. (C) 2012 Elsevier Ltd. All rights reserved.