摘要
详细介绍了实验流程及测试方法和数据处理。高湿环境条件下的实验数据显示:相同湿球温度下,较干燥的空气可以获得较高的系统能效比,冷凝器排热效率的变化则不明显;相同干球温度、风量和淋水量时,湿球温度升高,冷凝器的排热能力显著降低,排热效率则略有增加。对于特定的蒸发式冷凝器,存在最佳的迎面风速和喷淋水密度。根据实验结果拟合得到了换热管外水膜空气间的传热系数关系式。通过分析得出了不同排热量下冷凝器蒸气段、冷凝段和过冷段排热量比例和换热面积分配。
Presents the experimental procedure,test method and data processing in detail.Experiments in condition of high humidity environment show that the system COP tends to be higher while heat extracting efficiency of condenser remains almost the same in drier air environment under certain welt-bulb temperature,and that heat extracting capacity of condenser decreases distinctly and extracting efficiency increases slightly when wet-bulb temperature rises in condition of the same dry-bulb temperature,air rate and water spray density.The optimized value of face air velocity and water spray density could be obtained for given evaporative condenser.Based on the experimental results,fits the heat transfer coefficient between the water film and the air flow.Presents the distribution of heat extracting rate and heat transfer area of vapour section,condensing section and sub-cooling section in different heat extracting conditions.
出处
《暖通空调》
北大核心
2011年第5期98-103,共6页
Heating Ventilating & Air Conditioning
关键词
蒸发式冷凝器
排热效率
性能系数
肋片
evaporative condenser
heat extracting efficiency
coefficient of performance
fin
