【作者】 刘雪峰； 刘金平；

【Author】 Liu Xuefeng , Liu Jinping (College of electrical engineering, south china university of Technology, Guangzhou 510640)

【机构】 华南理工大学电力学院；

【摘要】 大型冷水机组大部分时间运行在部分负荷条件下,研究机组压缩机能效比随负荷率变化的规律,可为机组节能运行提供理论依据。本文在均匀负荷分配条件下,根据承担部分负荷的方式不同,建立了求解单台冷水机组压缩机能效比、蒸发温度、冷凝温度的数学模型,以及求解多台同型号机组不同并联运行方式的压缩机能效比的数学模型,并对比分析了运行特性。分析表明,离心式冷水机组只有在70%-100%负荷率条件下才能维持较高的能效比,能效比随负荷率的降低急剧降低,多台机组并联运行按总负荷减少量以单台机组额定负荷为限来控制机组启停,可以在很大的负荷区间内维持机组群总能效比在高水平。更多还原

【Abstract】 large - scale water chilling unit operates most of the time under part load conditions, study the law of compressor energy efficiency ratio(EER) varying with load rate, can offer the theoretical foundation for the unit’s operating with low energy consumption. Under the condition of uniformly load distribution, based on the different way of bearing part load, mathematical model which was used to solve EER of single water chilling unit, evaporating temperature, condenser temperature and the model of EER with multiple units of the same type under different way of parallel operation are established, the operating characteristics are compared and analyzed. The result shows that centrifugal water chilling unit can maintain higher EER only under terms at 70% - 100% load rate, EER decreases sharply with the decrease of load rate, the units’ running are controlled by single unit’s rated load according to total load reduction, it can keep total EER in high - level on very large load range.更多还原