成果報告書詳細
管理番号20130000000156
タイトル*平成24年度中間年報 省エネルギー革新技術開発事業 先導研究(事前研究一体型) 快適・省エネヒューマンファクターに基づく個別適合型冷暖房システムの研究開発(H23-H25)
公開日2013/5/31
報告書年度2012 - 2012
委託先名特定非営利活動法人ウェアラブル環境情報ネット推進機構 国立大学法人東京大学 株式会社竹中工務店
プロジェクト番号P09015
部署名省エネルギー部
和文要約
英文要約Title:
Research and development of individually adaptive temperature-conditioning systems based on human comfort and energy saving factors (FY2011-FY2013) FY2012 Annual Report
1) Development of core temperature control device
Core temperature control device was designed based on the experimental data obtained in FY2011. This device is capable of cooling the user’s neck to 20-28 degrees or warming to 40 degrees Celsius at power consumption of less than 20 W. Heat exchange is controlled by the sensor readings of neck temperature, room temperature, and humidity. It weighs less than 650 grams. Total of 100 units were fabricated for evaluation by a number of people.
A system to monitor neckwear devices’ operating conditions was developed. Operating data of the devices and user’s physical data are accumulated in cloud storage. Furthermore, operation of room air conditioners is integrated in this system. Room temperature will be regulated by the discomfort index derived from temperature, humidity and user’s physical condition.
2) Development of control algorithm for core temperature
Experiments have shown that semiautomatic control algorithm works best. This is based on automatic control by discomfort index with occasional manual override by the user. We constructed a heat transfer model by analyzing heat exchange among Peltier device, coolant, human body, and ambient environment, in order to obtain design guidelines.
Perception mechanisms of comfort/discomfort states were studied. Temperature preference had a good correspondence with occipital EEG alpha power, especially the one on the right hemisphere. This suggested that thermal stimuli can be considered as pain. Two-Dimensional Mood Scale test also supported this idea. A brain function model using a cognitive brain circuit for pain suggests that attention ability is degraded by anti-stress responses to such pain, and not by degradation of neural activity due to core temperature increase. Quick recovery of attention ability by neck cooling supported this hypothesis.
3) Evaluation of the human comfort and energy saving factors
Subjects consisting of 9 males and 3 females, aged between 20 and 40, evaluated the neckwear in a climate chamber. During the two sets of experiments, one wearing the device and one without, the subjects seated at desks for 2 hours and performed Continuous Performance Test (CPT). The room climate was the same in two cases (31°C/50%RH/0.15m/sWS). Visual Analogue Scale (VAS) evaluation has shown that subjects felt more comfortable when wearing the neckwear. Variation coefficient of reaction time in CPT was significantly smaller (p < .01) for 10 subjects who scored uncomfortable in hot environment. This indicates that using the neck-cooling device in hot environment improves continuous work performance and enables us to reduce the usage of room air conditioners. The estimated energy saving by one neck-cooling device is equivalent to 34.6 liters of crude oil.
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