摘要
基于现有的实验测试平台,实验分析了质流密度、干度、风速、翅片形状、蒸发温度、冷凝温度等实验变量对空气源热泵系统性能的影响规律。经实验验证:强化管内换热特性均优于光滑管,在冷凝换热实验中,管内换热系数与质流密度、干度均成正相关,而在沸腾换热实验中,管内换热系数随干度的增加呈现先增大后减小的变化趋势;3种不同翅型换热器,其换热特性优劣顺序为桥片型翅片换热器、百叶窗型翅片换热器、波纹型翅片换热器,而对于同一翅型换热器,空气侧换热系数与风速呈正相关、与翅片间距呈负相关;工况环境主要通过影响压缩机吸排气饱和压力影响机组性能,即压缩机压缩比的增加导致等熵耗功的增大,进而使系统性能降低。
Based on the existing experimental test platform,the influences of mass flux,vapor quality,wind speed,fin shape,evaporation temperature and condensation temperature on the performance of air source heat pump system were analyzed experimentally.The experimental results show that the heat transfer characteristics of enhanced tube is better than that of the smooth tube,in condensation heat transfer experiment,the heat transfer coefficient inside the tube is positively correlated with mass flux and vapor quality,but in boiling heat transfer experiment,the heat transfer coefficient increases firstly and then decreases with increasing vapor quality.The heat transfer characteristics of three different finned heat exchangers are in the order of bridge-fin heat exchanger,louver-fin heat exchanger and corrugated-fin heat exchanger,and for the heat exchanger with the same fin,the air-side heat transfer coefficient is positively correlated with wind speed and negatively correlated with fin space.Working conditions mainly affect the unit performance by affecting suction and exhaust pressure of compressor,that is,the increase of compressor compression ratio leads to the increase of the isentropic power consumption,and then the decrease of system performance.
作者
杨卫芳
桂超
刘亚萍
冯士伟
YANG Wei-fang;GUI Chao;LIU Ya-ping;FENG Shi-wei(School of Civil Engineering and Architecture,Xinxiang University,Xinxiang 453000,Henan Province,China)
出处
《化学工程》
CAS
CSCD
北大核心
2022年第11期26-30,49,共6页
Chemical Engineering(China)
关键词
空气源热泵
换热系数
强化管
翅型
压缩比
等熵耗功
air source heat pump
heat transfer coefficient
enhanced tube
fin shape
compression ratio
isentropic power consumption
