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요약정보
土壤-空气换热系统热性能的模拟与分析
Resource Type
Academic Journal
Authors
李步飞
;
王冠宇
;
刘庆功
;
王国英
;
赵子凡
Source
江苏农业科学 / Jiangsu Agricultural Sciences
. 47(7):265-277
Subject
土壤-空气换热器
数值模拟
耦合传热
节能
Language
Chinese
ISSN
1002-1302
Online Access
Find it @ DONGA
초록
针对土壤-空气换热器在日光温室中加热条件下土壤中热量传递的问题,研究利用SIMPLER算法,对土壤-空气换热系统的热性能进行数值模拟,并研究空气流速度对该系统热性能的影响,以获得最佳的进口空气速度.首先以土壤导热方程为基础,再结合k-ε湍流模型,将固体区与流体区作为1个整体全场求解,最后对空气与土壤的交界处用壁面函数法进行特别处理.在此基础上,通过建立土壤-空气换热器瞬态二维模型,模拟研究不同入口空气速度对土壤-空气换热器热性能的影响.模拟结果表明,当人口温度相同时,随着空气流动速度的加快,进出口空气温差逐渐减小.在此过程当中,系统换热量和COP的增加均越来越慢.通过模拟结果可知,空气的最佳入口流速为6.5 m/s.研究结果对农业温室的运行和节能有参考价值.
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