Indoor climate for comfortable sleep, considering heat and moisture transfer between the room, bedding and human body : Optimal control of an air-conditioner

与醒着的时间相比，很难保持房间舒适的睡眠，因为室内气候不能根据人在睡眠期间的热感觉自动控制。如果在睡眠时人体的热舒适与室内热条件之间建立关系，则可以根据该关系调节房间的热环境以满足睡眠时的热舒适。由于睡眠时无法报告热感觉，然而，睡眠时热感觉与生理反应或人体与周围环境之间的热传递之间的关系尚未确定。因此，我们提出了一种热控制系统，其基于清醒时的热感觉指数反馈睡眠期间的热感觉的计算结果，在这项研究中，空气控制系统提供了一个舒适的睡眠室内热环境。该系统预测睡眠时的热感觉指数。它可以反馈计算结果，以重新设置空调的目标温度。在本研究中，睡眠实验进行了在夏季和冬季使用一个年轻的主题，暂时假设一个舒适的区域的热感觉在睡眠过程中，在这个系统。目标温度与热感觉指数的预测值相结合得到了很好的控制，其随时间收敛到舒适区。热感觉的预测值的稳定的时间曲线与睡眠时不醒来以及因此舒适的睡眠密切相关。因此，所提出的空气控制系统，预测热感觉指数可以有效地创造一个舒适的室内气候的睡眠。

It is difficult to keep a room comfortable for sleeping compared to waking hours, because the indoor climate cannot be voluntarily controlled according to one's heat sensations, during sleep. If a relationship between thermal comfort for the human body and indoor thermal condition while sleeping is established, thermal environment of the room could be regulated according to the relationship to satisfy thermal comfort during sleep. Since thermal sensation cannot be reported while sleeping, however, relationships between thermal sensation and physiological responses or heat transfer between the human body and ambient environment during sleeping haven't been determined yet.Therefore, we proposed a thermal control system, which feeds back the calculated result of thermal sensation during sleep based on a thermal sensation index while awake and resets the target temperature of an air conditioner.In this study, an air control system providing an indoor thermal environment for comfortable sleep is proposed. This system predicts an index for thermal sensation while sleeping. It can feed back the calculated results to reset the target temperature of an air conditioner. In the present study, sleep experiments were carried out during both summer and winter seasons using a young subject by tentatively assuming a comfortable zone of thermal sensation during sleep under this system. The target temperature was well controlled in conjunction with the predicted value of the thermal sensation index, which converged into the comfortable zone with time. A stable time profile of the predicted values for thermal sensation is closely related to no awakening while sleeping and thus a comfortable sleep. Therefore, the proposed air control system that predicts the thermal sensation index could be effective in creating a comfortable indoor climate for sleep.