冷辐射墙系统对室外热环境的改善

THE IMPROVEMENT OF THE THERMAL ENVIRONMENT OF THE NEIGHBORHOOD BY THE COLD RADIANT WALL SYSTEM

选取夏季沈阳西塔步行街作为研究对象,通过实地测量和PHOENICS软件模拟,对比分析了步行街的室外热环境。发现测量数据与模拟数据的趋势大体相同,并且有较好的拟合结果,验证了PHOENICS模拟软件对街区室外热环境模拟的可行性。同时通过热舒适评价指标UTCI评价了湿热天气下街区的热舒适,其中阴影区外的行人活动区域UTCI值达到42℃左右,街区平均UTCI达到37℃左右,属于极端热应力和很强的热应力范围。为改善步行街的室外热环境,建立了冷辐射墙系统,通过试验验证和数据分析证明了冷辐射墙系统对室外热环境有较好的改善效果。最后在PHOENICS模拟软件中,将冷辐射墙模型加到原有的街区模型中,模拟发现在加入冷辐射墙的3号楼附近,风速增加了1m/s,温度降低了3℃左右,验证了冷辐射墙系统在热湿天气下对街区室外热环境有很好的改善效果。

In this study,Shenyang Xita Pedestrian Street was selected as the research object in summer.Through field measurements and PHOENICS software simulations,the outdoor thermal environment of the pedestrian street was compared and analyzed.It is found that the trend of the measured data is roughly the same as that of the simulated data,and there are good fitting results,which verifies the feasibility of the PHOENICS simulation software for the simulation of the outdoor thermal environment of the block.At the same time,the thermal comfort of the block under hot and humid weather was evaluated by the thermal comfort evaluation index UTCI,in which the UTCI value of the pedestrian activity area outside the shaded area reached about 42°C,and the average UTCI of the block reached about 37°C,which belonged to the range of extreme thermal stress and strong thermal stress.In order to improve the outdoor thermal environment of the pedestrian street,a cold radiant wall system was established,and it was proved that the cold radiant wall system had a good effect on the outdoor thermal environment through experimental verification and data analysis.Finally,in the PHOENICS simulation software,the cold radiant wall model was added to the original block model,and it was found that near Building 3 with the cold radiant wall,the wind speed increased by 1m/s and the temperature decreased by about 3°C,which verified that the cold radiant wall system has a good improvement effect on the outdoor thermal environment of the block in hot and humid weather.