Informatics Publishing Limited

Farhana Huqe ¹, Shuichi Torii ¹

Affiliations
1 Department of Advanced Mechanical System Engineering, Kumamoto University, Kurokami, 2-39-1, Kumamoto-860-8555, JP

Abstract

Global warming has become the greatest challenge for the world today. Now, researchers are trying to find out an alternative energy source of traditional fossil fuels to evict green house effect. From recent studies it is observed that, biogas has the potential to become an entrusted energy source for the current world as it can be extracted from solid wastes and the extraction processes are not only ecologically sound but also cost effective and is also an hygienic process to dispose the solid wastes. Basically, biogas is consists of methane (50-60%) and carbon dioxide (20-40%); with a small mixture of hydrogen sulfide and siloxanes as impurities. These impurities can damage the efficiency of biogas. But after successful removal of these impurities, the upgraded biogas can be used in different technologies, which are effective to turn biogas into energy source. But, the matter of fact is that, the lacking of knowledge to select proper substrate, not having sufficient knowledge to apply appropriate pre and post treatments of the raw materials creating obstacles to explore the vast application field of biogas. In this paper, we would like to focus on some familiar technologies by which the utilization of biogas can be extended and help to optimize and control the energy crisis of the world.

Keywords

Anaerobic Digestion, Biomethane, Upgradation.

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Mohamed Salem ¹, Tarek A. Meachail ², Magdy A. Bassily ³, Shuichi Torii ¹

Affiliations
1 Department of Mechanical System Engineering, Kumamoto University, Kurokami, 2-39-1, Kumamoto-860-5555, JP
2 Department of Mechanical Power, Aswan University, Aswan, EG
3 Department of Mechanical Power, Minia University, Minia, EG

Abstract

A two-phase closed thermosyphon (TPCT) is a device for heat transmission. The TPCT is composed of three major parts: Lower evaporator, the adiabatic region in the central range and the condenser at the top. Fluids with nanoparticles (particles smaller than 100 nm) suspended in them are called nanofluids that they have a great potential in heat transfer enhancement. In the present study, Nanofluids of aqueous Graphene oxide (GO) nanoparticles suspensions are prepared in various volume concentration of 0.05-0.20% and used in a TPCT as working media. Experimental results showed that for different input powers, the heat transfer coefficient of the TPCT increases up to 33.04% when GO/water nanofluid is used instead of pure water. A decrease of 24.83% is achieved in thermal resistance at 0.20 vol.% for GO/water nanofluid.

Keywords

Thermosyphon, Nanofluid, Thermal Resistance, Heat Transfer Coefficient.

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Priyambodo Nur Ardi Nugroho ¹, Shuichi Torii ¹

Affiliations
1 Department of Advanced Mechanical System Engineering, Kumamoto University, Kurokami, 2-39-1, Kumamoto-860-8555, JP

Abstract

Nowadays, the world highly depends on the fossil fuels like coal, oil and natural gas for its energy source. Yet within the next decades, fossil fuels will be depleted. Furthermore, environmental issues such as greenhouse emission enforced the government to switch to renewable energy. Biomass is one of the promising renewable energy due to its unique characteristics and availability. The fact, however, utilization of biomass as a source of energy, particularly in small scale for a rural area, is very limited. Some challenges in converting biomass for power generation will be stressed in this review. As one of the most challenging steps, gasification of biomass will be highlighted for investigation. In accordance with the latest reports, an excellent gasification method could produce a specific gas composition suitable for power generation in the rural area.

Keywords

Biomass, Challenges, Gasification, Rural Area, Small Scale.

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Liu Chong ¹, Shuichi Torii ¹, Chen Yuting ²

Affiliations
1 Department of Mechanical System Engineering, Kumamoto University, Kurokami, 2-39-1, Kumamoto-860-8555, JP
2 School of Chemical Equipment, Shenyang University of Technology, Hongwei, 111003, Liaoyang-0419-5319297, CN

Abstract

The solid rocket engine is widely used in missile. In order to expand the scope of attack, both increase specific impulse and decrease weight are become the research goal. In this paper, we take the vessel of solid rocket engine as research object, simulate the pressure of hydrostatic test, establish the finite element model of solid rocket engine vessel, solve the stress for any element in solid rocket engine vessel and find the maximum stress point by ANASYS, and then we solve reliability by the method of random analysis. According to this reliability, change the pressure which load on the inside of solid rocket engine vessel while insure reliability higher than the criticality. In this analysis, we can increase the pressure which loads the solid rocket engine vessel and we achieve the sensitivity of all parameters.

Keywords

Solid Rocket Engine, Shell, ANSYS, Reliability.

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Raju Aedla ¹, Ranipet Hafeez Basha ¹, Shuichi Torii ¹

Affiliations
1 Graduate School of Science and Technology, Kumamoto University, Kurokami, Chou-Ku, Kumamoto, JP

Abstract

The biomass is emphasized as an alternative to the conventional fossil fuels like coal and natural gas, even though the energy produced is considerably low. This is because of the easy availability of biomass from various natural sources, benefit of waste management and reduction of global warming. Biomass is any organic material which has stored sunlight in the form of chemical energy. As a fuel it may include wood, wood waste, energy crops, agricultural residues, forest residues, aquatic plants, human and animal wastes, municipal wastes. Biomass refers to recently living organisms, most often referring to plants or plant-derived materials. By conversion of biomass, biofuels are generated, which contains energy from geologically recent carbon fixation. Geospatial techniques such as Remote Sensing and Geographical Information System (GIS) can ensure optimum biomass resource potential sites for efficient renewable power generation. Biomass resources are identified using these geospatial techniques spatially as well as temporally. Geographic Information Systems (GIS) along with Remote Sensing (RS) advantages in mapping on spatial and temporal scales of the resources and are well appropriate for identifying of biomass resources potential zones. The present paper describes the importance and role of geospatial techniques in identification of biomass resources potential sites with existing studies. The study concludes that biomass resources can identify and assess by developing accurate geospatial model through database containing information about land cover, land use, regional cartography, administrative boundaries, populated areas, road network, a digital terrain model, lithological map, climatic data, industry, and a civil census.

Keywords

Biomass, Geospatial Techniques, Remote Sensing, Geographical Information System.

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