MISC - 友松 重樹
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太陽光レシーバから熱交換器への蓄熱粒子移動方法の検討
長瀬 慶紀, 友松 重樹
宮崎大学工学部紀要 49 39 - 44 2024年
掲載種別：速報，短報，研究ノート等（大学，研究機関紀要）
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俵 彰吾, 長瀬 慶紀, 友松 重樹, 木村 正寿
宮崎大学工学部紀要 52 41 - 46 2023年10月
記述言語：日本語 掲載種別：速報，短報，研究ノート等（大学，研究機関紀要） 出版者・発行元：宮崎大学工学部
In recent years, renewable energy sources that do not emit carbon dioxide, such as solar thermal power systems, have been attracting worldwide attention. Therefore, we are conducting research on solar thermal power systems using a beam down solar concentrator at the University of Miyazaki. The objective of the research is to develop a lifting device that continuously supplies thermal storage particles for use in solar thermal power systems. In this paper, air conveying device was produced and tested. As a result, not all particles could be lifted on condition that using the screw feeder. When lifting particles to height of more than 1.5m, the lifting method should be re-examined.
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ツインスクリュ膨張機によるオーガニックランキンサイクルの検討
山中 凌汰, 友松 重樹, 長瀬 慶紀, 木村 正寿, 長友 亮太
宮崎大学工学部紀要 51 83 - 88 2022年11月
記述言語：日本語 掲載種別：速報，短報，研究ノート等（学術雑誌） 出版者・発行元：宮崎大学工学部
The purpose of this study is to investigate the basic performance of a twin screw expander (TSE) by full-load test using compressed air, and then to consider construction of an Organic Rankine Cycle (ORC) system using TSE. The TSE used in this study is Oil-lubricated type, and an oil circulation line is necessary. Therefore, oil separate and circulate devices are manufactured. The influence of Ratio of the oil flow rate to the compressed air flow rate (O/A) on the performance of the TSE was investigated and the optimum O/A is 0.001. As a result, it was found that the peak of the brake power shifted to the high rotation side with the increase of the supply pressure, the brake power increases with increasing the supply pressure and the brake thermal efficiency and the engine efficiency were unchanged. In order to get the best performance, the TSE should be operated on optimum speed where the maximum brake thermal efficiency at each supply pressure.
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近藤 理人, 長瀬 慶紀, 濟陽 悠馬, 友松 重樹, 木村 正寿
宮崎大学工学部紀要 51 95 - 100 2022年11月
記述言語：日本語 掲載種別：速報，短報，研究ノート等（学術雑誌） 出版者・発行元：宮崎大学工学部
Today, renewable energy is attracting attention because of the problems of energy resource depletion and greenhouse gas emissions. In recent years, magnesium air batteries have been attracting attention as an emergency power source in the event of a disaster. The purpose of this research is to design and fabricate a evice to heat magnesium hydroxide, the product of magnesium air battery, indirectly and uniformly. A retort heating apparatus was fabricated for this purpose. Solar heat was used as heating source, produced by a beam-down solar concentrator, established at University of Miyazaki. In the experiment of uniform heating of a retort using a gas stove, it was found that the contents could be heated uniformly by heating the retort while rotating it. The reached temperature did not reach the target temperature due to the low power of the beam-down solar concentrator.
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楠木 達也, 友松 重樹, 長瀬 慶紀, 木村 正寿, 辻 俊祐
宮崎大学工学部紀要 51 89 - 91 2022年11月
記述言語：日本語 掲載種別：速報，短報，研究ノート等（学術雑誌） 出版者・発行元：宮崎大学工学部
Solar power generation has attracted attention, and studies has been conducted on Compressed Air Engine (CAE) as a prime mover for solar power generation. Although it is known from theoretical calculations that decreasing the clearance volume of CAE increases the efficiency, it is necessary to be clarified experimentally. Another reason for the low thermal efficiency is that the pressure decreases during the air supply process after top dead center (TDC), resulting in less work. The purpose of this study is to experimentally clarify the effect of the size of the clearance volume on the thermal efficiency and to experimentally investigate a method to reduce the pressure drop after the top dead center. Experiments were conducted with newly made a spacer to reduce the clearance volume, and the P-V diagram was compared. In addition, an intake chamber was installed to improve the pressure drop after top dead center (TDC). As a result, it was experimentally clarified that the illustrated thermal efficiency increased with decreasing the clearance volume, and that an intake chamber of about 10 times the stroke volume didn’t have a significant effect.
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邵 子陽, 長瀬 慶紀, 友松 重樹, 木村 正寿, 橋本 直季
宮崎大学工学部紀要 50 41 - 46 2021年9月
記述言語：日本語 掲載種別：速報，短報，研究ノート等（学術雑誌） 出版者・発行元：宮崎大学工学部
In solar power generation of this study, stroage particles heated by a solar receiver are put into a heat exchanger and directly contacted with the working fluid to exchange heat and drive a heat engine. It is difficult to continuously supply storage particles to a solar receiver and exchange heat because it is a batch type heat storage device up to now. In order to drive a heat engine and generate electricity while heating by solar heat, it is necessary to develop a system that continuously exchanges heat with the working fluid and heat storage particles. However, there is a pressure difference between the receiver and the heat exchanger, and the working fluid of the heat engine leaks when the heat storage particles flow. Therefore, the purpose of this study is to transport the heat storage particles to the heat exchanger from the solar receiver without leakage of the working fluid. Two valve mechanisms were used to prevent leakage of the working fluid.
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太陽光レシーバから熱交換器への蓄熱粒子移動方法の検討 査読あり
橋本 直季, 長瀬 慶紀, 友松 重樹, 野村 文椰, 木村 正寿
宮崎大学工学部紀要 49 39 - 45 2020年9月
記述言語：日本語 掲載種別：速報，短報，研究ノート等（学術雑誌） 出版者・発行元：宮崎大学工学部
In solar thermal power generation, it is necessary to put the heat medium heated by the solar light receiver into the heat exchanger, and exchange heat with the working fluid such as water or air that drives a heat engine such as a turbine. Previously, heat exchange experiments were conducted by directly contacting high-temperature air with a certain amount of alumina particles as a heat storage material. However, continuous heat exchange was not possible due to the batch type heat exchanger. Therefore, it is necessary to develop a heat exchanger that continuously exchanges heat by directly contacting the heat storage particles with the working fluid. For this purpose, a mechanism that allows the heat storage medium to move from the receiver at atmospheric pressure to the heat exchanger at high pressure is required. Since the mechanism uses a poppet valve to discharge heat storage particles, a preliminary experimental device was manufactured to confirm the operation.