Transient human thermophysiological and comfort responses indoors after simulated summer commutes
Transient human thermophysiological and comfort responses indoors after simulated summer commutes
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DOI：
10.1016/j.buildenv.2019.04.023
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发表时间：
2019-06
影响因子：
7.4
通讯作者：
Y. Zhai;Shengkai Zhao;Liu Yang;Na Wei;Qinyun Xu;Hui Zhang;E. Arens
中科院分区：
文献类型：
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作者：
Y. Zhai;Shengkai Zhao;Liu Yang;Na Wei;Qinyun Xu;Hui Zhang;E. Arens
本研究旨在探讨在高温条件下，经过一段时间的高强度活动后，人体在久坐活动期间的短暂生理和舒适反应。这种代谢和热台阶在夏季通勤后到达的建筑物中很常见。这对恒温控制造成了严重的问题，因为到达的居住者发现他们的过渡温度不舒服，而居住者觉得舒适。59名参与者（29名男性，30名女性）穿着0.6 clo，在暴露于30 °C 15 分钟后，在26 °C下静坐60 分钟进行测试，在此期间，他们进行代谢模拟通勤活动：坐着（SE - 1.2 met），或做三个级别的楼梯锻炼：低（LEx- 2.2 met），中等（MEx - 3.0 met），高（HEx - 4.4 met）。收集主观舒适度和生理反应（代谢率、皮肤温度、皮肤血流量、心率、核心温度和皮肤湿润度）。结果表明，26 °C的久坐状态在2 min内变得舒适和可接受，但热感觉从“温暖”或“热”转变为“中性”所需的时间要长得多：分别在SE， LEx, MEx， HEx后0,8,17,30 min。皮肤湿润度和核心温度在60 min内没有恢复。这种延迟主要是由于身体在运动过程中储存的热量。夏季通勤后，26 °C的室温可能无法提供足够的冷却。通过天花板或桌面风扇对过渡空间和工作区域进行局部对流冷却，是增强舒适度恢复的一种方式。
The current study investigates the transient human physiological and comfort responses during sedentary activity following a period of elevated activity in a hot condition. Such metabolic and thermal down-steps are common in buildings as occupants arrive after commuting in summer. It creates a serious problem for thermostatic control, since arriving occupants find their transition uncomfortably warm at temperatures that resident occupants find comfortable. Fifty-nine participants (29 men, 30 women) dressed in 0.6 clo were tested while sedentary for 60 min in 26 °C, after having been exposed to 30 °C for 15 min, during which they performed activities metabolically simulating commuting: sitting (SE - 1.2 met), or doing three levels of stair-step exercises: low (LEx- 2.2 met), medium (MEx - 3.0 met), and high (HEx - 4.4 met). Subjective comfort and physiological responses (metabolic rate, skin temperature, skin blood flow rate, heart rate, core temperature, and skin wettedness) were collected. Results show that sedentary conditions at 26 °C became comfortable and acceptable within 2 min, but thermal sensation required much longer to change from ‘warm’ or ‘hot’ to ‘neutral’: 0, 8, 17, 30 min after SE, LEx, MEx, HEx respectively. Skin wettedness and core temperature did not recover within the 60 min. The delays are mainly due to body heat stored during the exercise. A room temperature of 26 °C may not provide sufficient cooling after summer commuting. Localized convective cooling of transitional spaces and work areas by ceiling or desk fans represent a way to enhance comfort recovery.