基于热舒适的层式通风脉动送风参数优化

脉动送风耦合层式通风,可以在保证良好能效和空气品质的前提下,进一步改善人体热舒适.建立和验证了脉动送风耦合层式通风的室内三维(CFD)模型,计算了26组工况.基于实验验证的动态热舒适评价指标,即时间平均预测平均投票(TAPMV)和时间平均吹风感(TAPD),分析了脉动送风参数(周期总时长、高速期与低速期时长之比、送风速度)对热舒适的影响.利用多目标优化TOPSIS方法可知,当周期总时长为300 s,高速期时长与低速期时长之比为1,高速期的送风速度为1.95 m/s,低速期的送风速度为1.05 m/s时,热舒适综合评价最优.

Optimization of air supply parameters based on thermal comfort under stratum ventilation with pulsating air supply

Pulsating air supply combined with stratum ventilation has the potential to improve thermal comfort on the premise of ensuring good energy efficiency and indoor air quality. An indoor three-dimensional transient computational fluid dynamics (CFD) model for pulsating air supply combined with stratum ventilation was established and verified, and 26 simulation cases were calculated. Based on the dynamic thermal comfort evaluation indexes verified by experiments, namely the time-averaged predicted mean vote (TAPMV) and time-averaged percentage of dissatisfied due to draft (TAPD), the influences of various parameters of the pulsating air supply function (i.e., total period duration, ratio of the high-velocity duration to the low-velocity duration, and air supply velocity) on thermal comfort were investigated. One of the multi-criteria optimization methods, i.e., Technique for Order Preference by Similarity to an Ideal Solution (TOPSIS) was used. It was found that, when the total cycle duration was 300 s, the ratio of the high-velocity duration to the low-velocity duration was 1, the air supply velocity of the high-velocity duration was 1.95 m/s, and the air supply velocity of the low-velocity duration was 1.05 m/s, the comprehensive evaluation of thermal comfort is the best.