Based on the switching temperature calculation between the mechanical ventilation and the air conditioning system operation, presents the design and energy efficient evaluation methods of natural cooling source, reducing the energy consumption of fans by applying ventilation rate control scheme in transition seasons. The system is adopted in a large space factory building in Shanghai, and the annual energy consumption of the main chiller is 29.3% less than that of the system adopting air conditioning in transition seasons on condition of load rate 0.8, and in unloading control mode the fan consumes only 41% to 56% energy of that in full load operation mode in yearly operating air conditioning system. Holds switching the operation modes between the air conditioning and the mechanical ventilation according to the given date, and quantitatively analyses the relation between the allowable failure rate and energy efficient rate.%在计算通风空调切换温度基础上,提出过渡季应用自然冷源的设计及节能评估方法,通过采用过渡季通风量控制策略减少风机运行能耗.上海地区某高大厂房采用此方案,与过渡季空调方案相比,负荷率0.8时,空调主机年节能率为29.3％,卸载控制策略时的风机能耗为风机满载运行时的41％～56％.提出以日期作为通风空调运行切换依据,并定量分析不保证率与节能率的关系.
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