严寒地区超低能耗建筑夜间通风节能潜力分析

Analysis of Night Ventilation Energy Saving Potential for Ultra-Low Energy Consumption Buildings in Severe Cold Area

目的利用夜间通风降温技术对严寒地区超低能耗建筑进行研究,分析不同夜间通风换气量下制冷系统的耗能情况。方法以沈阳超低能耗建筑为模型,利用DeST软件对该建筑模型进行夜间通风模拟,实验测试对模拟结果进行验证,再对建筑模型进行不同夜间通风方案进行模拟。结果夜间通风室内温度的模拟结果与实测数据结果整体趋势一致。室内温度峰值与建筑冷负荷皆随着通风换气次数的增加呈现先陡后缓的下降趋势。建筑制冷系统的耗电曲线随着通风换气次数的增加呈现先下降后上升的趋势。夜间通风换气次数在6~8次/h内节能效果最佳。7月份建议采用夜间自然通风节能效果更佳。6、8、9月份在最佳夜间通风方案下的节能率为20.8%、11.11%、29.32%。结论DeST软件可以对严寒地区超低能耗建筑进行夜间通风节能效果分析。严寒地区超低能耗建筑利用夜间通风有助于降低室内峰值温度、建筑冷负荷以及制冷系统耗电量。

In this paper,the application of night ventilation cooling technology in ultra-low energy consumption buildings in cold region(Shenyang)was studied,and the energy consumption of refrigeration system under different night ventilation ventilation volume was analyzed.The ultra-low energy consumption building in Shenyang taken as a model,its ventilation was simulated with DeST software at night,and the simulation results were verified by experimental tests.Then the building model was simulated with different night ventilation schemes.The simulation results of indoor temperature at night were consistent with the measured data.With the increase of ventilation times,both the indoor temperature peak value and the building cooling load show a descending trend of steep at first and then slow.The power consumption curve of building refrigeration system decreases firstly and then increases with the increase of ventilation times.The best energy saving effect is achieved within 6~8 times/h of ventilation at night.In July,it is recommended to adopt natural ventilation at night for better energy saving effect.In June,August and September,the energy saving rates under the best night ventilation plan are 20.8%,11.11%and 29.32%.The effect analysis of night ventilation and energy saving for ultra-low energy consumption buildings can adopt the DeST software in cold regions.Night ventilation in ultra-low energy buildings in cold regions can help reduce peak indoor temperature,building cooling load and power consumption of refrigeration system.