The frame of the electric Eco-Vehicle is required to be as light as possible and to have enough room for many batteries. The frame assembled with thin aluminium plate instead of solid is thought to ...be advantageous. In this study, torsion tests and the finite element method calculation of a structure unit for Eco-Vehicle were conducted. The torsional deformation of thin shell structure was found to be explained by the theory of the bending of a thin plate rather than that of the pure torsion of a beam. Some examples of the optimized models of reinforced frame were also shown.
Japan Atomic Energy Research Institute (JAERI) has been proceeding a feasibility study of a direct gas turbine system (HTGR-GT) for 600MWt grade high temperature gas cooled reactors. This study will ...be contributed to design a high performance HTGR-GT system of 50% high thermal efficiency. In this study, very high performance design consisting of high recuperator effectiveness, low pressure drop, compactness, high thermal density and high differential pressure is required to the recuperator. A conceptual design study of ultra-fine offset fin type compact heat exchanger (height/pitch=1.0/1.0-1.5/1.5mm, fin thickness=0.1-0.15mm) was performed, considering not only flow pass and structural features, but material structural strength. The design study resulted in the high performance recuperator of 95% heat efficiency, low pressure drop (≤2%), 20MW/mm2 thermal density with 1, 500mm2/m3 surface compactness and high pressure tightness under 6MPa operation pressure. Research and developments for this type of recuperator are summarized for its practical use. The purpose of this study is to clarify the basic design concept and the performance of the compact heat exchanger for the HTGR-GT systems.
Japan Atomic Energy Research Institute (JAERI) has been proceeding a feasibility study of a direct gas turbine system (HTGR-GT) for 600 MWt grade high temperature gas cooled reactors. This study will ...be contributed to design a high performance HTGR-GT system of 50% high thermal efficiency. In this study, very high performance design consisting of high recuperator effectiveness, low pressure drop, compactness, high thermal density and high differential pressure is required to the recuperator. A conceptual design study of ultra-fine offset fin type compact heat exchanger (height /pitch=1.0/1.0approx1.5/1.5 mm, fin thickness=0.1=0.15 mm) was performed, considering not only flow pass and structural features, but material structural strength. The design study resulted in the high performance recuperator of 95% heat efficiency, low pressure drop ( < =2%), 20 MW/m exp 2 thermal density with 1500 m exp 2 /m exp 3 surface compactness and high pressure tightness under 6 MPa operation pressure. Research and development for this type of recuperator are summarized for its practical use. The purpose of this study is to clarify the basic design concept and the performance of the compact heat exchanger for the HTGR-GT systems.
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