摘要
微尺度高效换热器具有结构紧凑、热阻小、换热系数大等特点。以A/B混合制冷剂为工质,对其密度、饱和蒸气压、表面张力和黏度进行了计算并拟合出标准差在1%内的相应的物性温度曲线,并对其在-45、20、60℃入口温度下在1.1/1.2 mm尺寸的矩形微通道内的换热特性进行了实验研究,在给定400 W外热流下,不同入口温度有效换热热流密度都在50 000 W/m^2左右,入口温度越高,平均换热系数越大。
Microscale high efficiency heat exchanger has the character of compact structure,low thermal resistance and high heat transfer coefficient. The density,saturated pressure,surface tension and viscosity of the refrigerant mixed with A and B were calculated and curve fitting of physical properties to temperature with the standard deviation under 1 percent were established. The heat transfer characteristics in a rectangle micro channel with the size of 1.1 mm/1.2 mm at the inlet temperature of-45,20 and 60℃the external heat flux density of 400 W is studied,the different working condi-tion has the same effective heat exchange heat flux density while the average heat transfer coefficient grows with the inlet temperature.
出处
《真空与低温》
2016年第2期81-84,共4页
Vacuum and Cryogenics
基金
重点实验室基金(9140C550308140C55014)
关键词
混合制冷剂
物性
微通道
热流密度
换热系数
mixed refrigerant
physical properties
rectangle micro channel
heat flux density
heat transfer coefficient