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本報では、住宅における電力消費量と給湯負荷の実測調査結果を元に、給湯エネルギー消費量を満足した時点で停止した場合のガスエンジンによるコジェネレーションシステムの有効性について報告する。コジェネレーションシステムは発電の際に生じる排熱を利用し、エネルギー効率を上げることができる。ガスエンジンを導入することで、排熱により給湯エネルギー消費量のほぼ全部をまかなうことができ、一次エネルギー消費量、CO_2非出量ともに削減が可能である。

報告番号: ; 学位授与年月日: 2012-03-22 ; 学位の種別: 修士 ; 学位の種類: 修士(環境学) ; 学位記番号: 修創域第4378号 ; 研究科・専攻: 新領域創成科学研究科環境学研究系環境システム学専攻

In this study, we analyze the mechanism of the future change of a occurrence frequency of Guerrilla-heavy rainfall in the Kinki region in August by focusing on the future change of lapse rate and water vapor inflow using a 5km-mesh regional climate model (RCM05). From the analysis, we show the frequency of days will increase when Showalter Stability Index (SSI), which expresses atmospheric stability, becomes lower in the Kinki region in late August although lapse rate will decrease. Lower SSI means that atmosphere is unstable. Then we show that the reason of destabilization of SSI is the increase of water vapor in lower layer. Finally, we use Self-Organizing Map (SOM), which is one cluster classification method, to reveal the main reason of the increase of water vapor in the lower layer in late August. The results show the wind field which blows from the Pacific to the Kinki region is increasing, and this explains rich water vapor flux is supplied to the Kinki region.

Palm oil is one of effective vegetable oils as alternative diesel fuel because of the high productivity and low cost. In this study, to utilize palm oil methyl ester (PME) as a diesel fuel, the engine performance and exhaust emissions for PME are investigated using a DI diesel engine compared with rapeseed oil methyl ester (RME), soybean oil methyl ester (SME) and gas oil. As the results, PME has shorter ignition delay compared with RME, SME and gas oil. Brake thermal efficiency with PME is about the same as those with RME, SME and gas oil. NOx and Smoke emissions from PME simultaneously are lower than those from gas oil. Therefore, PME can be used as an alternative fuel of petroleum diesel fuels.

持続可能性の概念は今後の都市開発における重要なパラダイムであり，それを達成する一つの有効な方法としてコンパクトシティ政策が注目されている．本研究では，交通サービスに加えて一般財の消費も含めた個人の効用関数を定義し，彼の現在の効用水準を維持するという条件の下でエネルギー消費量を最小化した場合，最適な財の消費パターンが実績消費パターンとどれほど異なっているかによって都市のコンパクト性を評価するモデルを提案する．このモデルを熊本都市圏の2時点，および長崎都市圏にも適用し，どのような都市構造や交通サービスが現在の効用水準を維持した上でのエネルギー消費量削減に貢献するかを実証的に明らかにする．

It has been considered that primary driving force of the Tsushima Warm Current (TWC) is the net pressure difference between the south and north straits, i.e., inflow-outflow dynamical process. On the other hand, the most intriguing aspect of surface circulation in the Japan Sea is the tremendous contrast between the incoming, TWC water and the cold water north of the polar front. So, the theory developed for inflow-outflow dynamics should be modified to include the thermo-dynamical process. To start a discussion for dynamics, we need to briefly review the scale of TWC system in space and in time. Next, I solved the heat equation containing the lateral heat transport from the East China Sea and sea surface cooling at the annual mean state in conjunction with the geostrophic equation of motion, and boldly predicted the TWC change caused by global warming.

修士(工学) ; 法政大学 (Hosei University)