垂直U形管内含油制冷剂流动的数值分析  

Numerical Analysis of Refrigerant/Oil Mixture in a Vertical U-tube

作　　者：曹小林[1] 曾伟[1] 陈惠[1] 曹双俊[1] 王芳芳[1] 

机构地区：[1]中南大学能源科学与工程学院,长沙410083

出　　处：《制冷学报》2012年第1期46-50,共5页Journal of Refrigeration

摘　　要：利用EES软件对直接膨胀式地源热泵系统中U形埋管换热器内含油制冷流动状态进剂行了模拟分析。模拟分析结果表明:含油制冷剂压力沿U形埋管先缓慢增加后减少;温度沿U形埋管先增加后减少,进入过热区后急剧增加;在U形埋管上升管段中含油制冷剂不存在泡状流,以弹状流和环状流形式存在,且以环状流为主;最小回油速度随U形埋管管径的增加而增加。计算结果和实验结果的对比表明实验系统能够正常回油。EES software was used to simulate the flow of refrigerant and oil in underground U-tube of the Direct Expansion Ground Source Heat Pump.The results show that： the pressure of refrigerant/oil mixture first increases and then decreases along the U-tube;the temperature of refrigerant/oil mixture increases firstly and then decreases,in superheat region,the temperature rises sharply;the refrigerant/oil mixture exits in U-tube mainly as annular flow;the minimum refrigerant/oil return velocity is increasing when the U-tube diameter increases;comparing the simulation results with the experimental results find that the oil in the U-tube of the experimental system can return normally.

关 键 词：工程热物理 地源热泵 数值计算 U形管换热器 最小回油速度 

分 类 号：TB64[一般工业技术—制冷工程] TK121[动力工程及工程热物理—工程热物理]