图书馆建筑的夜间通风节能效益分析

Energy Saving Benefit of Night Ventilation in Library Buildings

利用EnergyPlus软件模拟了某高校图书馆的全年空调负荷。分析了图书馆分别位于哈尔滨、西安、上海三地,分别执行峰谷电价和正常电价的条件下,夜间通风换气次数和室内蓄热体对通风效果的影响。结果表明:夜间通风可有效降低设计日负荷和供冷季累计负荷;各地均存在夜间通风的最佳换气次数和临界换气次数,哈尔滨对应的两个换气次数最大,上海对应的两个换气次数最小;峰谷电价情形对应的两个换气次数均大于普通电价情形;供冷季累计负荷随室内蓄热体量的增大而线性减小;对比三地区图书馆夜间通风的经济效益,哈尔滨最佳,上海最差。

The annual air conditioning load of a university library is simulated by the software EnergyPlus. The influence of ventilation rate and indoor thermal mass on the energy conservation of night ventilation are analyzed in cases of two electricity prices,peak-valley price or normal price,where the library is located in Harbin,Xi’an or Shanghai,respectively. The results indicate that night ventilation can effectively reduce the cooling load on the design day and the total load throughout the cooling season. As for the night ventilation in the library in every city,there are an optimal value and a critical value of ventilation rate. The two ventilation rates in Harbin and in Shanghai are the greatest and the least respectively in the three cities;the two ventilation rates in the case of peak-valley electricity price are greater than those in the case of normal electricity price. The total load throughout the cooling season decreases linearly with the increase of indoor thermal mass. The economic benefits of night ventilation in Harbin and in Shanghai are the best and the worst respectively in the three cities.