突变热环境中桌面风扇作用下的热舒适研究

Investigation of dynamic thermal comfort with desk fan in different transient environment in summer

为了研究温度突变工况下使用风扇对人体热舒适的影响,在人工环境实验室内,营造了不同的温度突变环境(34.0-26.0-34.0、34.0-28.0-34.0、34.0-30.0-34.0℃)对20名青年受试者开展了人体热反应的实验研究。实验对比分析不同工况下受试者心理和生理反应的变化。实验结果表明:温度突降时,会出现“冷感超越”现象,且温差越大,超越现象越明显,热感觉稳定时间越长,发现使用风扇能显著改善热湿环境中受试者的热舒适;温度突变幅度越大,皮肤温度的变化越大,且温度突升时的稳定时间大于突降工况;同时得到受试者在温度突变环境中的热感觉预测模型。

This research mainly focused on investigating dynamic thermal comfort to transient thermal environments with desk fans in hot-humid area. Three step-change processes(34.0-26.0-34.0, 34.0-28.0-34.0, 34.0-30.0-34.0 ℃) were presented with 20 young subjects in chamber rooms. Thermal perceptions and physiological parameters were recorded continuously. The results show that overshoot in thermal sensations occurs after down-step changes. As the magnitude of temperature step increases, the overshoot becomes more significant, and the longer time is required to reach stability. Desk fans could significantly improve thermal comfort of subjects after step-change in the hot-humid environments. Besides, the skin temperature changes greater with increasing temperature difference. The stable time after up-step is greater than that after down-step. Additionally, a prediction model of thermal sensation in transient thermal environments is obtained.