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Mori T.,Hokkaido University | Tsuji K.,AXS Satow Inc. | Tsuji H.,Sokensha Inc. | Hayama H.,Hokkaido University
Journal of Environmental Engineering (Japan) | Year: 2015

Hot water energy consumption is one of the biggest energy consumption and living expense in our life. In this paper, we report the energy consumption of hybrid system by using pellet boiler with CO2HP in the welfare facility. The facility has multi purpose, such as a dormitory, a hospital and a sheltered workshop for physical disabilities. It needs much hot water for cooking and bathing. We conducted the measurement of the energy consumption for hot water. The results shows that the power of pellet boiler was much less than design value and the COP of CO2HP was very low. Therefore, we optimized the usage of thermal storage tank and HP system. Also, we conducted the numerical simulation for hot water supply with the Hybrid system. The result indicate that cost is lower when the difference between water level in a day and that in a night is bigger. Source

Chiba N.,Utsunomiya University | Mitsuhashi N.,Utsunomiya University | Honjo H.,Utsunomiya University | Katsuki T.,AXS Satow Inc.
AIJ Journal of Technology and Design | Year: 2014

In order to acquire the environment of city hall easy to use for citizen, making opportunities of community workshop in basic design are desired. Therefore, the study aims to verify the effectiveness of method and results of the workshops in the case of S city hall. Three types of correspondence were found between the drawings and citizen's opinions presented at the workshops. From analyses of the correspondence and questionnaire to the designers and administrative officers, it could be summarized that reflection of citizen's needs in the drawings and community development are both due to effective discussions on the workshops. Source

Kajiya R.,Meiji University | Hiruta K.,AXS Satow Inc. | Sakai K.,Meiji University | Ono H.,Meiji University | Sudo T.,Nikken Sekkei Research Institute
Proceedings of Building Simulation 2011: 12th Conference of International Building Performance Simulation Association | Year: 2011

For the surface temperature of clothing, body surface temperature, and detailed temperatures and heat flow phenomena of soles contacting the floor, results of measurement experiments using human subjects were compared with results of simulations conducted by CFD using a thermal mannequin. The surface temperature of clothes, body surface temperature, and conduction heat quantity at soles contacting the floor of the numerical thermal mannequin generally agreed with results of actual measurements. Consequently, it was confirmed that warmer environments considering human body in the floor heated room can be reproduced generally by CFD analysis using a thermal mannequin considering contact thermal conduction. Source

Kurabuchi T.,Tokyo University of Science | Shimizu H.,Tokyo University of Science | Hiruta K.,AXS Satow Inc. | Iwamoto S.,Kanagawa University | And 6 more authors.
Journal of Environmental Engineering | Year: 2011

This study is aiming at evaluating resultant distributions of thermal and airflow environment in a room ventilated with various air supply openings, and comparing input energy required for heating with floor heating systems or with convective heating systems. Experiments were conducted for different PMV levels. The results are summarized as follows: l) Conditions of the warm jet issuing from convective heating system significantly affect the vertical and horizontal temperature differences, airflow structures, DR and PMV values. 2) Thermal and airflow environment is maintained uniform, and DR values in most places are kept under 15% during heating with floor heating system.3 Attachment points and diffusion paths of the ventilated air are markedly different depending on the air supply openings.4 Input energy required for heating with floor heating system is roughly 20% smaller than that of convective heating system if evaluated with secondary energy directly concerned with room heating. Source

Yagi S.,AXS Satow Inc. | Moriyama S.,Nikken Sekkei Ltd. | Hagiwara I.,Japan Building Research Institute | Hasemi Y.,Waseda University | And 2 more authors.
AIJ Journal of Technology and Design | Year: 2015

Tsunami evacuation buildings were used in the Great East Japan Earthquake. This paper reports an investigation on the actual use and disaster impacts of the tsunami evacuation buildings. There were many cases that tsunami rises up higher than actual tsunami depth. This means that it is not enough that refuge floors are located just higher than the assumed tsunami depth. There were many cases that buildings were cut off by debris, subsidence and flooding. Tsunami evacuation buildings are for temporary refuge, but this means that it is necessary to assume the stay in tsunami evacuation buildings. Source

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