摘要
结合工程实例,采用典型工况时间段方法简化了水泵运行总能耗计算。对不同并联台数及不同运行控制方式下循环水泵变频调速运行的节能特性进行了分析研究。利用水泵相似定律,给出了确定变转速运行时各工况点水泵效率的等效率曲线法。分析结果表明,对于常用的水系统控制方式而言,水泵转速(流量)比与轴功率比的三次幂关系不成立;对于3台泵并联运行的水系统,可以用水泵额定工况点效率代替典型工况点效率,从而使计算大为简化;空调水系统采用水泵变频调速装置,其经济性是肯定的,且经济性优劣与工程类型密切相关。
With a project example, simplifies the method of calculating general energy consumption of the pump in cooling season according to the weight of different typical operating mode durations. Analyses the energy saving potential of variable frequency drive （VFD） operation of the circulating pumps with different number of pumps in parallel under different control methods. Based on the similitude law of pumps, presents the method for determining the pump efficiency under different working conditions with variable speed, i.e. an equivalent efficiency curve method. The results show that for the common pump control methods, the third power relation between the pump rotate speed （water volume） ratio and the shaft power ratio is not true~ for the water system with three pumps in parallel, pump rating working point efficiency can be used instead of typical operating point efficiency in order to simplify calculation; applying VFD devices to an air conditioning water system is sure in better economic effects, which is closely related to the type of buildings.
出处
《暖通空调》
北大核心
2006年第8期25-32,共8页
Heating Ventilating & Air Conditioning
关键词
变频调速
典型工况点
特征工况点
标准工况点
相似定律
工频运行
variable frequency drive, typical operating point, characteristic operating point, standard operating point, similitude law, operating with motor in constant frequency
