According to a ward office building air conditioning system historical operation data, the number of air-conditioning cooling load operation is analyzed, the time frequency and air conditioning systems circulating water temperature difference trend with air-conditioning load are researched, a 4: 2:4 group control method to the modular water chillers and air-conditioning water system energy-saving control scheme of variable frequency plus constant temperature difference is presented. Energy-saving control system using programmable logic controller (PLC) as the core controlling device is built. The running experiments show a remarkable energy-saving rate of 26. 1 %, with good energy efficiency and economy effects.%依据某病房办公楼空调系统的历史运行数据,进行了动态负荷需求分析,研究了空调运行冷负荷次数、时间频数和空调系统循环水温差随空调负荷变化趋势,提出了将模块化冷水机组4∶2∶4分组控制和空调水系统恒温差变频控制相结合的按需供冷方案.搭建了以PLC为核心的节能控制系统,经过运行实验,节能率26.1％,达到了很好的节能效果和经济性.
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