Dobre Cătălina, Grosu Lavinia, Dobrovicescu Alexandru, Chişiu Georgiana, Constantin Mihaela
Department of Engineering Thermodynamics, Engines, Thermal and Refrigeration Equipment, University Politehnica of Bucharest, Splaiul Independenței 313, 060042 Bucharest, Romania.
Laboratory of Energy, Mechanics and Electromagnetic, Paris West Nanterre La Défense University, 50, Rue de Sèvres, 92410 Ville d'Avray, France.
Entropy (Basel). 2021 Mar 19;23(3):368. doi: 10.3390/e23030368.
The purpose of the study is to show that two simple models that take into account only the irreversibility due to temperature difference in the heat exchangers and imperfect regeneration are able to indicate refrigerating machine behavior. In the present paper, the finite physical dimensions thermodynamics (FPDT) method and 0-D modeling using the Schmidt model with imperfect regeneration were applied in the study of a β type Stirling refrigeration machine.The 0-D modeling is improved by including the irreversibility caused by imperfect regeneration and the finite temperature difference between the gas and the heat exchangers wall. A flowchart of the Stirling refrigerator exergy balance is presented to show the internal and external irreversibilities. It is found that the irreversibility at the regenerator level is more important than that at the heat exchangers level. The energies exchanged by the working gas are expressed according to the practical parameters, necessary for the engineer during the entire project. The results of the two thermodynamic models are presented in comparison with the experimental results, which leads to validation of the proposed FPDT model for the functional and constructive parameters of the studied refrigerating machine.
本研究的目的是表明，仅考虑热交换器中由于温差导致的不可逆性以及不完全回热的两个简单模型能够指示制冷机的性能。在本文中，有限物理尺寸热力学（FPDT）方法以及使用具有不完全回热的施密特模型的零维建模被应用于β型斯特林制冷机的研究。通过纳入不完全回热以及气体与热交换器壁之间的有限温差所导致的不可逆性，对零维建模进行了改进。给出了斯特林制冷机火用平衡的流程图，以展示内部和外部的不可逆性。结果发现，回热器层面的不可逆性比热交换器层面的更重要。根据整个项目中工程师所需的实际参数，给出了工作气体交换的能量。将这两个热力学模型的结果与实验结果进行了比较，从而验证了所提出的FPDT模型对于所研究制冷机的功能和结构参数的有效性。
