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Watanabe D.,Misawa Homes Institute of Research and Development Co. | Inoue K.,Nihon University | Suzuki T.,Nihon University
Journal of Environmental Engineering (Japan) | Year: 2012

This study comprised a basic investigation on the derivation of formulas for calculating the weak-axis bending rigidity, first natural frequency, and driving-point impedance of anisotropic slabs. The resulting conclusions were as follows. 1) The formula for the weak- axis bending rigidity can be expressed in terms of mean rigidity based on the angle of rotation induced at different positions in the slab cross-section. 2) For the first natural frequency and the driving-point impedance, the formula can be expressed as a coordinate transformation of the equation for the free vibration of an anisotropic slab to the equation for that of an isotropic slab. Source


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. Source


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. Source


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. Source


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. Source

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