基于多目标算法集热/蒸发器微通道结构优化  

Optimizing micro-channel structure in a collector/evaporator using multi-objective algorithm

作　　者：孔祥强[1] 岳振伟 尹鹏宇 刘明朝 陈冲 李瑛[1] KONG Xiangqiang;YUE Zhenwei;YIN Pengyu;LIU Mingzhao;CHEN Chong;LI Ying(College of Mechanical and Electronic Engineering,Shandong University of Science and Technology,Qingdao 266590,China)

机构地区：[1]山东科技大学机械电子工程学院,青岛266590

出　　处：《农业工程学报》2023年第8期86-94,共9页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金面上项目(51776115);山东省研究生导师指导能力提升项目(SDYY17037);山东科技大学研究生导师指导能力提升计划项目(KDYC17009)。

摘　　要：为提升微通道集热/蒸发器流动与传热性能,该研究通过多目标算法对集热/蒸发器微通道孔结构进行优化。首先,建立集热/蒸发器流动传热耦合模型,通过试验验证模型准确性;其次,采用响应曲面法拟合集热效率和压降的目标函数,建立以微通道集热/蒸发器结构参数为变量的双目标优化模型,并通过多目标粒子群优化算法得到集热效率和压降的Pareto优化解集,用K-means聚类算法对优化解集进行分类;最后,采用不同季节典型工况试验数据确定最佳微通道孔结构尺寸。研究结果表明:集热效率和压降目标函数的决定系数R^(2)分别为0.995和0.999,拟合精度高;孔长、孔宽及孔间距对集热效率和压降影响显著;最终确定孔长1.27 mm、孔宽1.53 mm、孔间距0.39 mm为最佳微通道孔结构尺寸,与原结构相比,集热效率平均提高了8.29%,压降平均降低了11.05%。此方法提供了一定工况范围的优化解集,提升了微通道集热/蒸发器流动与传热性能。Solar collector can serve as an evaporator(i.e.,collector/evaporator)in a direct-expansion solar-assisted heat pump(DX-SAHP)system.Among them,the refrigerant can directly absorb the heat from the solar energy and/or ambient air.Much effort has been made to optimize the traditional structure of micro-channel in the heat exchangers.However,it is still lacking on the influence of multiple structural parameters coupling on the flow and heat transfer characteristics of the collector/evaporator.In this study,the experimental platform of DX-SAHP water heater was designed and built using R^(2)90(propane)as refrigerant in Qingdao City,Shandong Province,China.A series of experiment and simulation were applied to explore the flow and heat transfer characteristics of the micro-channel collector/evaporator.Firstly,the appropriate and accurate correlations were selected to establish the flow and heat transfer coupled mathematical model of micro-channel collector/evaporator.The accuracy of the model was then verified by a large number of experimental data.Secondly,three structural parameters were selected as the hole length,width,and spacing in the flow channel of micro-channel collector/evaporator.25 groups of simulation was then conducted.Response surface method(RSM)was used to establish the ternary quadratic nonlinear objective functions of collector efficiency and pressure drop after simulation.Response surface graphs were obtained to clarify the influence of three structural parameters on the collector efficiency and pressure drop.Finally,the multi-objective particle swarm optimization(MOPSO)algorithm was introduced to optimize the structure parameters of micro-channel collector/evaporator flow channel.The representative solutions were obtained by k-means clustering.The optimal solutions were achieved within a certain range of working conditions.The eight kinds of structures were calculated by MOPSO.Specifically,the collector efficiencies were much greater than that of the original,while the corresponding pressure drops we

关 键 词：集热/蒸发器 太阳能 热泵 微通道 结构参数 多目标优化 

分 类 号：S26[农业科学—农业水土工程] TK11[农业科学—农业工程]