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据《浙江制冷通讯》1990年第3期报道,浙江省制冷学会咨询部于去年初对杭州国际大厦的“8FS—12.5型冷水机组采用无级调速进行节能”做了立项前的可行性分析研究.经过几个月的调研分析,认为利用可控硅串级调速代替原卸缸方式来进行能量调节,不能达到节电目的.其理由是:第一、从热力计算分析,调速到720rpm 时的计算功率为84.6405KW,与卸缸调节75%(六缸运行)时的实测功率相比略有节电,但把调速设备等能耗计入后,其实际耗电量则反而增大;第二,在75%和50%产冷量工况下,调速工作电流都要高于卸载的工作电流,第三,采用可控硅串级调速电机后,当调速比为1∶2(额定转速1/2)时,电网端输
According to “Zhejiang Refrigeration Communications” reported in 1990 No. 3, Zhejiang Institute of Refrigeration Advisory early last year on the Hangzhou International Building, “8FS-12.5-type chillers with stepless speed regulation of energy saving” done before the feasibility of pre-project Research.After several months of research and analysis, that the use of SCR cascade instead of the original cylinder way to carry out energy regulation, can not achieve the purpose of saving.The reason is: First, from the thermal analysis, speed The calculated power at 720rpm is 84.6405KW, which is a little power saving compared with the measured power when the unloading cylinder is adjusted at 75% (six-cylinder operation). However, after the energy consumption of the speed regulating apparatus and so on is included, the actual power consumption is instead Increase; secondly, 75% and 50% cooling capacity conditions, the speed of work current should be higher than the unloading of the operating current, third, the use of silicon controlled cascade speed motor, when the speed ratio 1: 2 (rated speed 1/2), the grid terminal