哈尔滨地区办公建筑夜间机械通风影响因素

Influencing factors of mechanical night ventilation for an office building in Harbin

为降低空调系统的运行能耗,根据哈尔滨地区夏季室外气候特点,选出代表该地区夏季典型气候的3 d对办公建筑应用夜间机械通风室内热环境进行模拟分析.利用EnergyPlus模拟分析换气次数、夜间通风开启时间和围护结构对夜间通风效果的影响.结果表明:在常规空调运行风量范围内,换气次数越大,夜间通风开启时间越长,室内空气温度和围护结构内表面平均辐射温度下降速度越快,夜间通风效果越明显.重型墙体与轻型墙体相比,由于夜间通风周期短,通风效果的差别不大.

In order to save operation enrgy for air -conditioning systems, the summer outdoor climate in Harbin was analyzed, and 3 typical days were chosen. Then the indoor thermal environment with mechanical night ventilation in an office building in Harbin was simulated. The influencing factors of night ventilation such as the air change rate, the ventilation period and the envelope were analyzed. Results show that, in the range of ventilation rates for a conventional air - conditioning system, indoor temperatures and mean radiant temperature of the envelope surface decrease quickly as the increase of air change rate and ventilation period, thus the effect of night ventilation is obvious. While the envelope surface temperature and air temperature of the heavyweight walls are almost the same as those of the lightweight walls because of the short night ventilation period.