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Lee S.,Shinshu University | Park B.,Center for Building Energy Technology | Kim J.,Misawa Homes Institute of Research and Development Co. | Kato S.,University of Tokyo
Journal of Building Engineering | Year: 2016

The purpose of this study is to examine the thermal characteristics of a multi-sheet-type radiant panel heating system and its effect on the indoor thermal environment. To examine the thermal characteristics using computational fluid dynamic (CFD) simulations, simulation of a radiant panel model that considers actual usage condition combined with convection and radiation is very important. We analyze the indoor thermal environment of a real-scale space, heated by a radiant heating system, using full-scale measurement and CFD simulation. In a multi-sheet-type radiant panel, the convective heat transfer is greater than the radiative heat transfer. The multi-sheet-type radiant panel is actually not a real “radiant panel.” It is named as such by the American Society of Heating, Refrigerating, and Air-Conditioning Engineers because its radiative heat transfer is more than 50%. We also determine the effects of indoor setup location of the radiant panel and panel shape on the heat-discharge characteristics. Compared with a single-sheet-type with the same heat discharge, a multi-sheet type has a larger surface area and area of contact with air. Thus, the convective heat transfer is greater, and the radiative heat transfer is smaller. © 2016 Elsevier Ltd


Ainoya T.,Tokyo Metroplitan University | Kasamatsu K.,Tokyo Metroplitan University | Shimizu K.,Musashino Art University | Tomita A.,Misawa Homes Institute of Research and Development Co.
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2016

This paper described about design method using design thinking by collaboration with designer and engineer for the service robot development. A service robot does not have the substitution function what does the thing a person can’t do in concerning with a person. It’s necessary for a service robot to create to be able to do because it’s a robot. This research aimed at the light in outdoor. This made the watch function as well as the role as the illumination last, and the feedback which isn’t robot-like was shown by the illumination pattern. The relation between an expression of illuminations and the feeling was examined using psychophysical method to express the function as an expression of illuminations by this illumination pattern. Developed illuminations could mount a function expression as watch and offer more solutions by data and a sensing. © Springer International Publishing Switzerland 2016.


Kajikawa H.,Misawa Homes Institute of Research and Development Co. | Miyamoto Y.,Meiji University | Noguchi H.,Meiji University
World Conference on Timber Engineering 2012, WCTE 2012 | Year: 2012

Should eccentricity not be designed in timber structures? Design theory of steel and RC structures are reducing eccentricity and designing to base shear. However, if timber structures have eccentricity, it might become high capacity of energy absorption and toughness. This paper shows outline, result and consideration of 1/6 scale model shaking table experiment. Parameter is modulus of eccentricity, horizontal diaphragm stiffness and collapse story in 2, 3, 5 and 7-story test body. Focusing attention on process of breaking especially, 'possibility of mid-rise timber structure* becomes a consideration from this experiment. Copyright © (2012) by WCTE 2012 Committee.


Ogawa H.,Misawa Home Co. | Kajikawa H.,Misawa Homes Institute of Research and Development Co. | Noguchi H.,Meiji University
World Conference on Timber Engineering 2012, WCTE 2012 | Year: 2012

This study verifies whether sheathing area ratio method is applied to horizontal diaphragm in timber structure by finite element method analysis. Sheathing area ratio method is the evaluation method of strength and shear stiffness in shear wall of timber structure with opening which is proposed Sugiyama et al. As the result, shear strength and shear stiffness shows smaller by sheathing area ratio is larger. However, analysis results showed a slight variation for the sheathing area ratio. Copyright © (2012) by WCTE 2012 Committee.


Kajikawa H.,Misawa Homes Institute of Research and Development Co. | Miyamoto Y.,Misawa Homes Institute of Research and Development Co. | Noguchi H.,Meiji University
WCTE 2014 - World Conference on Timber Engineering, Proceedings | Year: 2014

The bidirectional rahmen structure using wood bonded composite panels (FWS construction method) is assumed for large-scale 3 to 5 story structures. The first report[1] described a 3-story office building built using this construction method. For this paper the author conducted the structural calculation and response analysis for medium- and high-height structures (10, 20, and 30 stories) built using the FWS construction method and having the same column spacing and details as other construction methods. This verification is used to discuss the structural potential and problems of the FWS construction method for medium- and high-height structures.


Kim J.,Misawa Homes Institute of Research and Development Co. | Kato S.,University of Tokyo | Park B.,Tokyo University of Science
Journal of Environmental Engineering (Japan) | Year: 2014

Heat use in the residential, most of the thermal use is space heating and hot water heating. In summer, a cooling demand is greater, the heat source of cooling should also be considered. Regarding the efficient use of heat by cogeneration, it is a fundamental requirement. As a device of heating and cooling heat source by using the waste heat from cogeneration, the absorption chiller has been spread. However, the big size of equipment and the use of chemical materials (lithium chloride) are not suitable for a residential housing. In recent, an adsorption chiller has been developed using adsorbent material such as silica-gel. However, it is difficult to apply in the residential in terms of maintenance which is a need to keep the vacuum state. Desiccant air conditioner is applying the adsorbent material. It is widely used in humidity control. Moreover, it can be supplied to the cooling heat source by spraying water to created dry air in atmospheric pressure. The purpose of this study is to develop a prototype of desiccant air-conditioning system utilizing the adsorption refrigeration cycle in atmospheric pressure with cogeneration for residential use. The chilled water temperature obtained by spraying water in dry air at atmospheric pressure is about 20°C, cannot reach at 5 °C ∼ 7 °C water temperature for space cooling which uses convection air conditioner. But, it can be solved in combination with radiation cooling system.


Ainoya T.,Misawa Homes Institute of Research and Development Co. | Kasamatsu K.,Tokyo Metroplitan University | Tomita A.,Misawa Homes Institute of Research and Development Co.
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2015

The two types of illuminations were developed as security sensing with motion sensor instead of the image. We focused on the lights in outdoor in this study. As the role of outdoor lights, the proposed light has a function that feels natural presence of residents and pedestrian light as illumination. We examined about a new style of lighting and proposed the lighting which combined functionality of street light and outdoor light. We conducted concept planning, prototyping, experiments for determining flash lighting and evaluation, and proposed two design models. The proposed lightings in this study were able to provide a solution by data and sensing, and to achieve safety and security. © Springer International Publishing Switzerland 2015.


Miki T.,Japan National Institute of Advanced Industrial Science and Technology | Sugimoto H.,Japan National Institute of Advanced Industrial Science and Technology | Kojiro K.,Misawa Homes Institute of Research and Development Co. | Furuta Y.,Kyoto Prefectural University | Kanayama K.,Japan National Institute of Advanced Industrial Science and Technology
Journal of Wood Science | Year: 2012

Enthalpy relaxation of dry wood has been investigated by temperature-modulated differential scanning calorimetry. The reversing and non-reversing heat flow changes revealed that enthalpy relaxation occurred in dry wood, which did not exhibit any clear glass transitions. This enthalpy relaxation behavior seemed to differ significantly from those of previously reported isolated lignins, which implies that the microstructure of dry wood possesses a rigid amorphous state derived from interactions among wood components. The observed enthalpy relaxation is considered to be related to other components besides lignin, and the time-dependent physical properties due to unstable states or physical aging of wood originate not only from lignin but also from other components, such as cellulose and hemicellulose and the interactions between them. © 2012 The Japan Wood Research Society.


Miki T.,Japan National Institute of Advanced Industrial Science and Technology | Sugimoto H.,Japan National Institute of Advanced Industrial Science and Technology | Kojiro K.,Misawa Homes Institute of Research and Development Co. | Furuta Y.,Kyoto Prefectural University | Kanayama K.,Japan National Institute of Advanced Industrial Science and Technology
Journal of Wood Science | Year: 2012

The thermal properties and transitions of solid and ground wood samples conditioned at different humidity conditions were investigated by temperature-modulated differential scanning calorimetry. A time-dependent transition was detected as an endothermic peak in the total and non-reversing heat flows and as a step change in the reversing heat flow during the first heating run of samples with moisture contents above 5 %, but it disappeared in the second heating run. These different thermal behaviors indicate that the effect of heat and moisture on the thermal properties of wood is history dependent. This step change in the reversing heat flow is considered to be a glass transition of moist wood. Other relaxation processes (e. g., enthalpy relaxation) occur simultaneously with this glass transition. The temperature ranges of the transition and the relaxation decreased drastically as the moisture content increased up to 11 %, while they remained almost constant at higher moisture contents. In addition, the transitions of the ground wood occurred at lower temperatures than those of the solid wood at similar moisture contents. Kissinger plots revealed that the apparent activation energy for the glass transition of the solid wood with a moisture content of 11 % was about 600 kJ/mol, whereas that of the ground wood was 220 kJ/mol. © 2012 The Japan Wood Research Society.


Kikuchi A.,Akito Kikuchi Architect. | Kajikawa H.,Misawa Homes Institute of Research and Development Co.
World Conference on Timber Engineering 2012, WCTE 2012 | Year: 2012

This is project of the recovery of the great east japan earthquake. In the housing shortage after the earthquake affected areas has become a serious problem. A possible cause, shortage of materials, lack carpenter, is considered an economic problem.We suggest the timber hut that people can assemble without using any specific equipment, and timber hut is taken into account economic efficiency, workability, about the living environment, so they can use it such as the assembly place , shops and offices and so on. Copyright © (2012) by WCTE 2012 Committee.

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