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Effects of Oil on Boiling of Replacement Refrigerants Flowing Normal to a Tube Bundle-Part II: R-134a 油对正常流向管束的替代制冷剂沸腾的影响第二部分:R-134a
获得了沸腾制冷剂向上和穿过代表全淹没蒸发器管束的管束段时的局部实验传热系数。R-134a数据与结构化强化沸腾管一起提供。该管具有为高饱和压力制冷剂设计的凹入腔。制冷剂以15%的蒸汽质量进入,以接近100%的蒸汽质量流出,以模拟实际的蒸发器管束。热通量2607至10427 Btu/h·ft2(8224至32893 W/m2)和油含量0%至12%(按重量计)都是不同的;质量通量不是自变量,而是由热通量决定的。通过热电偶直接测量局部管道和整体流体温度,以计算制冷剂侧的传热系数。管束段饱和温度设定值(取自管束顶部)为40℉(4)。 4摄氏度)。单位:双引文:研讨会,ASHRAE交易,第106卷,pt。1
Local, experimental heat transfer coefficients have been obtained for boiling refrigerant flowing up and across a tube bundle segment representing a full flooded evaporator tube bundle. R-134a data with a structured enhanced boiling tube are available. This tube has reentrant cavities designed for higher saturation pressure refrigerants. The refrigerant enters at 15% vapor quality and exits at nearly 100% vapor in order to simulate an actual evaporator bundle. Both heat flux, 2607 to 10,427 Btu/h·ft2(8224 to 32,893 W/m2), and oil content, 0% to 12% (by weight), are varied; the mass flux is not an independent variable but determined by the heat flux. Local tube and bulk fluid temperatures are measured directly, by thermocouples, to calculate the refrigerant-side heat transfer coefficients. The bundle segment saturation temperature setpoint (taken at the top of the tube bundle) is 40°F (4.4°C).Units: Dual
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