关于中央空调节能改造方案，在中央空调的循环系统（冷却泵、冷冻泵及冷却风机）中接入变频系统，利用变频技术改变电机转速来调节流量和压力的变化用来取代阀门控制流量，能取得明显的节能效果。-Central air-conditioning energy-saving programs on access frequency central air-conditioning system in the circulatory system (cooling pumps, refrigeration pum

xmc风机的pcb文件，以及相应的说明文章，便于大家的理解，这个虽是在网上找的，但是我自己试过，的确有用。-XMC fan PCB documents, as well as the corresponding descr iption of the article, easy to understand, this is the online to find, but I have tried, it is useful.