溴化锂吸收式制冷系统变频控制及其稳定性研究.pdf

文章编号：CAR159 溴化锂吸收式制冷系统变频控制及其稳定性研究 解国珍 张新兴 孔繁颖 （北京建筑工程学院环境与能源工程学院，北京 100044 ） 摘 要 在不同季节、不同天气、不同时段下，制冷机组冷负荷变化较大，普通空调机组冷却水系统采用定频定流量系统， 在空调制冷机组的负荷变化时，会引起循环冷却水的温度发生较大的波动，其结果既不节能，也不利于机组正常、安全稳定 地运行。本文通过分析空调冷却水系统特点和运行要求，将变频控制和 PLC 应用于冷却水系统与溴化锂吸收式制冷机组 （简 称溴冷机），形成闭环变频控制系统。当空调负荷变化或外界温、湿度变化，造成冷却水出水温度变化时，通过变频调节冷 却塔风机转速，实现无级调节冷却塔的冷却能力，既保证溴冷机组安全稳定运行，又达到降低综合能耗的目的。 关键词 溴冷机 冷却塔 变频 稳定性 Xie Guozhen Zhang Xinxing Kong Fanying (School of Environment and Energy Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044) Abstract The cooling load of refrigeration unit change greatly with different season, different weather and different time. Because the cooling water system of common air conditioning unit uses fixed frequency and constant flow system. When the load of air conditioning and refrigeration unit is changing, it leads the temperature of circulating cooling water the causes of circulating cooling water temperature fluctuations of large energy, the result is not normal, also go against units, safe and stable operation. Through analyzing the characteristics of air conditioning cooling water system and operation requirements，variable frequency control and PLC applied to airconditioning cooling water system and lithium bromide absorption chiller, and composed of closed-loop control. When the air conditioning load or temperature and humidity of the environment change, it leads to the cooling water temperature changes. On this condition, the fan’s speed of the cooling tower is adjusted by the frequency regulation to achieve it’s stepless adjustment. Finally, it can not only ensure the safety of lithium bromide absorption chiller, but also decrease the integrated energy consumption. Keywords Lithium bromide absorption chiller Cooling tower Frequenc