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Mori Y.,Tokyo University of Science | Inoue T.,Tokyo University of Science | Mae M.,Tokyo University of Science | Satoh M.,University of Tokyo | Yatsuzuka H.,Satoh Energy Research Co.
Journal of Environmental Engineering (Japan) | Year: 2014

This report shows the actual situation of the spread and the use of mixing faucet and shower head in housing and the use of hot water, based on the result of web questionnaire. It was indicated that the single-lever mixing faucet recently became widespread about 90%, and that the ratio of using hot water in kitchen differed considerably between about 80% in winter and 20% in summer. It was also suggested that though they did not need hot water in summer and middle season, about a single-lever mixing faucet, there was high ratio of using the lever at the position where hot water was mixed. Source


Mori Y.,Tokyo University of Science | Inoue T.,Tokyo University of Science | Mae M.,University of Tokyo | Satoh M.,Satoh Energy Research Co. | Murakami Y.,Tokyo University of Science
Journal of Environmental Engineering (Japan) | Year: 2014

The objective of this research is to grasp the effect of high insulation bathtub on heat-retention of hot water, by means of web questionnaire, laboratory experiment, and actual survey in houses. As a result, the followings were obtained; 1) It is indicated that high insulation bathtub is remarkably effective for restraining falling in temperature of hot water in bathtub, and that the insulation effect is not observed clearly when the lid of bathtub is opened even if it is the high insulation bathtub. 2) The insulation performance of bathroom also affects the decrease in water temperature as well as that of bathtub. As with insulation of the bathtub, it is important to insulate the bathroom. 3) It is suggested that to estimate water temperature drop by using bathtub heat loss coefficient would be possible. Source


Takase K.,University of Tokyo | Mae M.,University of Tokyo | Akamine Y.,Japan Building Research Institute | Kono R.,Osaka Institute of Technology | And 2 more authors.
Journal of Environmental Engineering | Year: 2012

In these systems the need of floor heating is increasing by residents selecting open-plan houses But there are a few studies on floor heating using heat pump which uses less energy than other heating systems We have been developing the floor heating system using low temperature hot water and stocking heat energy in PCM and keeping inner thermal environment stable in houses which are well-insulated and airtight. We have been measuring and evaluating two houses using this system In conclusion both houses kept inner temperature stable between 17°C and 24°C during heating period using floor heating in a short time every day It is shown that making hot water in low temperature using with airconditioner and operating low power at starting time of heating contribute to low energy consumption. Source


Serikawa M.,University of Tokyo | Mae M.,University of Tokyo | Akamine Y.,Japan Building Research Institute | Satoh M.,Satoh Energy Research Co. | And 2 more authors.
Journal of Environmental Engineering | Year: 2012

In this research, we investigated the quantitative effect of bathing on the heat loss of hot water in the bathtub and thermal storage of the human body through experiment and simulation using 65-Node thermoregulation-Model applied to bathing. In the experiment, three subjects took a bath four times, with temperatureoftheir tympanic membrane and hot water measured. It turned out that about 700-1200kJ of heat is lost from hot water in the bathtub and about 400-650kJofheat is charged in human body by twenty minutes bathing. Source


Tomiyama S.,University of Tokyo | Satoh M.,Satoh Energy Research Co. | Nakajima H.,University of Tokyo | Mae M.,University of Tokyo
Journal of Environmental Engineering (Japan) | Year: 2015

The purpose of this study is to clarify the effects of housing appliances such as energy-efficient water heaters and co-generation system and diversifying family composition and bathing habits on Energy Consumption especially hot water usage which is dominant in Japanese households. We conducted a web questionnaire survey to the dwellers of detached houses in temperate and cold climate. First, we analyzed the household characteristics and kinds of heating appliances they use based on the type of water heaters they use then compared the amount of energy they consume. Secondly, by focusing on the age of householders as an indicator of households' life stage, we found that the older the householders get, the more annual income they get, the older house they live and the more energy they consume. Finally, we quantified the effects of the life stage and bathing habits on the hot water energy consumption by conducting a multiple regression analysis and found that men in their 40s and women in their 20s, 60s and older consume much hot water energy. Source

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