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某办公楼于１９８９年投入使用，建筑面积约２００００ｍ２，空调系统采用新风加风机盘管，到目前为止已经使用了１０多年。１９９４年前后，离子交换系统因运行不正常而停止使用。近几年，结垢现象导致风机盘管系统已无法正常使用，采用除垢剂对管道的清理导致了管道的堵塞及
An office building was put into use in 1989 with a building area of about 20,000 m2. The air-conditioning system uses fresh air and fan coils. It has been used for more than 10 years so far. Before and after 1994, the ion exchange system was out of service due to abnormal operation. In recent years, the fouling phenomenon has caused the fan coil system to no longer work properly. The use of scale remover to clean the pipeline has resulted in blockage of the pipeline.