Performance analysis and optimization of refrigeration cyclebased on three classes of new working substances

随着科学的发展和技术的进步，制冷技术已越来越凸显其重要地位和人们对其的依赖。传统的气体压缩膨胀制冷技术是当今制冷空调领域的主流，然而气体制冷因其存在一定程度的温室效应、噪音较大以及制冷效率提高的空间有限等不利因素，促使不少学者和工程技术人员正在探寻一些潜在的绿色节能制冷新技术。磁制冷、电热制冷、半导体热电制冷等新型工质制冷技术节能环保优势明显，采用的循环工质均为固体材料，已获得越来越多学者和工程师的关注和重视。本博士论文研究以磁热材料、电热材料和半导体热电材料为工质的新型磁制冷、电热制冷和半导体热电制冷循环的性能，主要研究内容如下： 第二和第三章研究以磁热材料为工质的Ericsson制冷循环...With the development of science and technology, refrigeration technology has become more and more important one. The traditional gas compression refrigeration technology is of the mainstream in the present field of refrigeration and air-condition, but it has some disadvantages such as greenhouse effect, noise, and limited cooling efficiency. For this reason, a number of scholars and engineers are ...学位：理学博士院系专业：物理科学与技术学院_凝聚态物理学号：1982013015423

Influence of Thermal Hysteresis on the Performance of a Regenerative Magnetic Ericsson Refrigeration Cycle Using LaFe_(11.6)Si_(1.4) as the Working Substance

一级相变材料lAfE_(11.6)SI_(1.4)是磁制冷应用中的重要磁热材料,其固有的磁滞和热滞对实际制冷循环性能有较大影响,然而现有文献对此尚未研究。本文基于考虑热滞影响的材料lAfE_(11.6)SI_(1.4)的等场热容实验数据,建立考虑热滞效应的回热ErICSSOn制冷循环,揭示热滞、非平衡回热和冷热源温度等对制冷循环主要热力学性能参量的影响,应用数值计算方法,比较了考虑热滞与否时制冷循环的净制冷量、性能系数等性能参量。研究结果能为磁制冷机循环的优化参数设计提供有益的参考。The first order phase transition material LaFe_(11.6)Si_(1.4) is an important magnetocaloric material for magnetic refrigeration.The intrinsic magnetic and thermal hysteresis of the material have a large impact on the performance of actual refrigeration cycles.However,these influences have been rarely investigated in the literature.Based on the experimental data of the iso-field heat capacity of LaFe_(11.6)Si_(1.4) with thermal hysteresis,a regenerative Ericsson refrigeration cycle with thermal hysteresis is set up in this paper,and the effects of thermal hysteresis,non-perfect regeneration,and the temperatures of cold and heat reservoirs on the main thermodynamic parameters,including the cooling quantity,coefficient of performance(COP),and so on,of the refrigeration cycle are revealed.The net cooling quantity,COP,and other performance parameters of the refrigeration cycle with and without thermal hysteresis are compared by means of numerical value calculation.The results obtained here may provide some significant message for the optimal parameter design of magnetic refrigerator cycles.国家自然科学基金(No.51176160