Taking the design of BA system of Taiyuan Inter-continental Hotel as the example, the paper illustrates the concept of the building au-tomatic control system, BA system, introduces the design methods for the air-conditioner, the cold and heat resource, power supply and distribu-tion, water supply and discharge, and points out the building automatic control system can lower the equipment maintenance cost, simplify the management staff, and have better economic benefits.%以太原洲际酒店BA系统设计为例，阐述了楼宇自控系统BA系统的概念，对空调、冷热源、供配电、给排水等各系统的设计方式进行了详细介绍，指出楼宇自控系统可降低设备维护费用、精简管理人员、产生良好的经济效益。
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