大空间建筑侧下送风热环境的实验研究

针对大空间建筑室内空调气流组织采用侧下送风的情况,研究了不同空气送风量和不同室外气象参数等条件下室内热环境的特性.实验结果表明,各工况下室内垂直温度分布具有良好的相似性,实验范围内最大垂直温差可达20℃,且该值随综合空气温度呈线性变化.室内上部、中部、下部3个区域的垂直温度梯度各不相同,空气送风量和室外综合温度对上部和下部区域垂直温度梯度的影响较大,对中部区域影响较小.此外,因风速较低,各工况下人员活动区域舒适性预期评价略偏高,人体头足垂直温差一般超过3℃.

Experimental study on thermal environment in large-space building with low sidewall air supply

The thermal environmental characteristics are experim-entally studied in terms of different air supply volumes and outdoor meteorological parameters in a large-space building which is air conditioned with a low sidewall air supply.The experimental results show that the indoor vertical temperature distributions under different condition are similar.The maximum vertical temperature difference（MVTD）is up to about 20 ℃,and it linearly changes with the sol-air temperature.The indoor vertical temperature gradients（VTGs）in the upper,central and lower zones are different.The influence of the sol-air temperature on the VTGs in the upper and the lower zones is greater than that in the central zone.The characteristics of the VTGs in the three zones affected by the air supply volume are the same as those affected by the sol-air temperature.Besides,because of the small air velocity,the predicted mean vote（PMV）on comfort in the occupied zone is slightly high and the air temperature difference between the head and the ankle is usually more than 3 ℃.