Time filter

Source Type

Satoh M.,Satoh Energy Research Co. | Tsujimaru N.,Satoh Energy Research Co. | Murakami S.,Institute for Building Environment and Energy Conservation | Akimoto T.,Shibaura Institute of Technology | And 7 more authors.
Refrigeration Science and Technology | Year: 2015

The BEST cogeneration study sub working group has been developing simulation models related to cogeneration systems (CGS) since 2008 to simulate the system including CGS using the BEST program. This paper describes simulation case studies of CGS in a hotel which has high hot water loads using BEST for energy conservation standards revised in 2013 (BEST program 2013) and summarizes input parameters about CGS and utilization of exhaust heat from CGS equipment. Simulation case study results show that exhaust heat is used efficiently for hot water loads in most cases, and it would be better to use exhaust heat to hot water load than cooling/heating load.


Seike T.,University of Tokyo | Akimoto T.,Shibaura Institute of Technology | Serikawa M.,Satoh Energy Research Co. | Satoh M.,Satoh Energy Research Co. | Aozasa K.,Artep Corporation
AIJ Journal of Technology and Design | Year: 2016

In this research, we investigated living style of residents, visualization facilities and energy consumption in houses which were built as leading projects by promotion program for CO2 emission reduction projects of MLIT (Ministry of Land, Infrastructure, Transport and Tourism).


Murakami Y.,Tokyo University of Science | Inoue T.,Tokyo University of Science | Masayuki M.A.E.,University of Tokyo | Iwamoto S.,Kanagawa University | And 4 more authors.
Journal of Environmental Engineering (Japan) | Year: 2015

The objective of this research is to grasp the relation of hot water saving shower head among optimum flow rate, feelings of use and physical properties through some experiments. As a result, the followings were obtained; 1) It is clarified that method for measurement of spray force considered to be connected with optimum flow rate. And also, it becomes clear that factor and degree of the error which can occur to be measure spray force. 2) As the mean flow in free bathing experiment is almost optimum flow rate of the chest, and total satisfaction is similar to chest satisfaction, showerhead usage appraisal can be determined from optimum flow at chest area and degree of satisfaction for men and women in their 20s. 3) It is shown that possibility to grasp the optimum flow rate by measuring total spray force. Spray force of almost shower heads at optimum flow is approximately from 0.6N to 0.7N. That of shower heads adding air bubbles into the spray is about 0.5N.


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.


Kiyono A.,University of Tokyo | Mae M.,University of Tokyo | Satoh M.,Satoh Energy Research Co. | Akamine Y.,Japan National Institute for Land and Infrastructure Management | And 3 more authors.
Journal of Environmental Engineering (Japan) | Year: 2016

In this study, we investigated the ununiformity of local thermal discomfort caused by thermal insulation performance and heating system, through the simulation of CFD and thermal network calculation. It turned out that convection heater tends to be unsatisfying because of draft, floor heating because of floor temperature, and stove and panel heating because of vertical temperature distribution.


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.


Choi Y.,University of Tokyo | Obara K.,University of Tokyo | Kusakawa K.,University of Tokyo | Takase K.,University of Tokyo | And 4 more authors.
Journal of Environmental Engineering (Japan) | Year: 2014

For apprehending the performance of solar heating system, it is important to understand the relations of heating load and the system elements such as heat collection, heat storage, insulation, and so on. In this study, the measurements in the 3 buildings made progress at the same time for comparing the influence by these elements on the system, because the effect of the solar heating system is fluctuated by weather conditions. This paper describes outline of the measurements and specifications of the two test buildings that the air-based solar system is installed in. It also shows the changes of the heat flow on underground surface by installing the insulation under basement, changing the area of solar heat collector, or applying the water-pack as the additional heat storage.


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.


Kawashima H.,University of Tokyo | Satoh M.,Satoh Energy Research Co. | Takase K.,Tokyo University of Science | Nakagawa A.,University of Tokyo | And 2 more authors.
Journal of Environmental Engineering (Japan) | Year: 2014

On the Pacific side of Japan, we can take advantage of rich solar energy in winter times to design the low cost passive solar heating system by the direct solar gain through glazing. To keep the room air temperature warm and comfortable only by the passive way, it is important to design the balance among heat gain, heat loss, thermal mass, and thermal mass area. First, we focused on PCM (Phase Change Material), light enough for Japanese wood structure houses to have greater heat capacity, and proved its performance by the actual space experiment. Based on this result, we made the numerical model to simulate the room air temperature with PCM. Finally, we proposed an easy evaluation method to find the better combination of the four, using Southern window area to Q-value chartswith adaptable time rate estimation.


Kim S.,University of Tokyo | Kono R.,University of Tokyo | Satoh M.,Satoh Energy Research Co. | Kindaichi S.,University of Tokyo | And 3 more authors.
Journal of Environmental Engineering | Year: 2011

The authors have built a small test cabin to promote utilization of solar heat energy and have been conducting measurements of temperatue, solar radiation, heat flow, electric power and so forth in the cabin. Four important elements were introduced into the cabin in order to make high energy performance and enough thermal comfort. Namely, there are highly insulated envelope, much solar direct gain, a floor heating system including PCM packages for thermal storage and air source heat pump in the cabin. The paper describes outline of specifications for the test cabin and mechanism for energy conservation in the test cabin. It also shows results of verification relating to solar radiation. Good agreement is obtained between calculation and measurement in each of the three phases of solar radiation flow. Behaviors of the floor heating system including the PCM and the heat pump will be followed in the next paper.

Loading Satoh Energy Research Co. collaborators
Loading Satoh Energy Research Co. collaborators