Published papers

A time-series assessment of urban environment was carried out by using “CASBEE-City” tool in Kobe city to visualize the disaster recovery process. As a result of the assessment, it was revealed that the score for quality of Kobe city calculated by the tool got drastically worse soon after the great Hanshin-Awaji earthquake in 1995. However, the score for quality of Kobe city has gradually recovered after the earthquake and has improved to the current position along with the progress of the reconstruction.

Toward mitigation of climate change, the Japanese government targeted that greenhouse gas emissions will be reduced by 80% of the 1990 level by 2050. However, CO2 emissions in non-residential sector are rapidly increasing, making carbon reduction in this sector a crucial concern. It is essential to establish CO2 reduction target and agenda based on the analysis of energy consumption and the prediction of the CO2 reduction potential. However, a lack of statistical data of floor area makes it difficult to conduct an analysis and prediction. Therefore, database for floor area of non-residential buildings has been developed in this study. This database includes stock and flow data of floor area by building use type and area which have a major impact on energy consumption in nonresidential buildings. This database can provide valuable information for carrying out countermeasures in non-residential sector.

伊香賀らが開発した日本建築学会LCA指針準拠ツールに、資源消費量、廃棄物発生量、リサイクル量、最終処分量などの評価機能を追加したツールの開発概要を報告

Enhancement of the governance and the cooperative structure of local governments toward the reduction of carbon output is becoming more and more important. In this study, the CO2 reduction potential of the town of Yusuhara - selected as one of the “Eco-model Cities for the Low Carbon Society” (EMC) by the Japanese cabinet office - is estimated considering the change of social situation. Such estimation supports local governments to formulate their action plans and contributes to the realization of low carbon society.

筆者らが開発した日本建築学会LCA指針準拠ツールに、資源消費量、廃棄物発生量、リサイクル量、最終処分量などの評価機能を追加したツールを用いたオフィスビルのケーススタディ

地場産木材を利用した高知県梼原町総合庁舎を評価対象とし、現地調査と統計データを基にした環境影響評価を北米材、欧州材と比較検討した。

東京都が温暖化対策の一環として、都有施設（庁舎、学校、病院）におけるLCCO2低減手法の費用対効果評価ツールとCASBEEの併用手法を論述した。

国土交通省の支援の下に、筆者らが研究・開発してきた建築物総合環境性能評価システム（CASBEE）のうち、既存建物を評価する手法を述べた。

岩手県の温暖化対策推進策の一環として、戸建住宅の温暖化対策推進のためのCO2とコストの同時評価システムの内容を論述した。

我が国の建築分野が、当面の京都議定書第１約束期間の数値目標を達成するだけでなく、IPCCが警告している長期シナリオに乗せるために、我が国の建築分野がどう対処すべきかについて、CO2排出量の2050年までの予測を示した。日本建築学会声明のベースになっている研究。

産業連関表、その他の統計資料を基に、事務所、ホテル、学校、病院等12用途の建築物について空調、衛生、電気、昇降機設備のライフサイクル環境負荷原単位データベースを作成した。日本建築学会LCA指針、国土交通省グリーン庁舎計画指針をはじめとして広く利用されている。

CASBEE-City, a comprehensive environmental assessment tool for municipalities (cities, towns, and villages), was developed to support citizens, local governments, and other stakeholders in understanding their local conditions. In this study, the aim was to examine the tool’s practical effectiveness through a nationwide questionnaire survey. The statistical relationship was analyzed between the subjective assessment results (citizens’ satisfaction with local conditions) and the objective CASBEE-City assessment results, which are based on public statistical information. A clear relationship was found between the subjective and objective assessment results for municipalities, thus verifying the tool’s effectiveness.

It is important to promote energy-saving actions toward the reduction of CO2 emissions residential sector. Residents should understand the actual conditions of energy consumption in their home in order to make energy-saving actions more effective. Therefore, in this research, a tool which suggests effective energy-saving actions was developed based on literature research and questionnaire survey. A workshop was conducted in Kawasaki City. Then, the residents received the information of their actual energy usage and effective energy-saving actions suggested by the aforementioned tool. As a result, 6.4% of CO2 reduction was achieved.

In this study, we model the estimation of the CO2 balance throughout the life cycle of construction timber. We study about construction utilization period considering forest-growth and show the long-term estimate of the emission reduction effect. As a result, it was found that CO2 balance become plus (absorption) using Japanese cedar and cypress in Kochi Prefecture more than 50 years as construction timber. Moreover, as a result of long-term estimate, we show emission reduction effect by increasing the construction timber volume and extending the utilization period.

In order to clarify the effect of classroom environmental quality on students’ health and learning performance, field measurements, assessments using CASBEE-School (Comprehensive Assessment System for Built Environment Efficiency for school) , and　questionnaire survey for students and their teachers were conducted in 12 elementary schools. From the results of the survey conducted in both summer and winter, a significant correlation was observed between score for Q1 (indoor environment) category of CASBEE-School and students’ satisfaction with their classroom in each school, and effectiveness of assessments by CASBEE-School was validated. However, there is still room for further improvement of assessment system in detail. In addition, a significant correlation between students’ satisfaction and both of physical conditions and concentration was observed in this study.

At present, the use of eco-friendly building materials is needed in order to reduce the environmental load. From this viewpoint, a LCA database has been established by the Architectural Institute of Japan. However, the database has two problems. First, the environmental load of imported wood materials is not evaluated. Second, the environmental load of wood materials in the database is stored as an average value. The purpose of this study is developing a LCA database of wood materials that takes into account imported wood materials and contains detailed data for the forestry, manufacturing, and transport stages.

In 2009, the Japanese government published their greenhouse gas (GHG) emission reduction target to reduce GHGs by 25% by 2020 and 80% by 2050. To meet this target, formulating suitable policy has become an urgent issue. In this study, we have developed a model for predicting the low-carbon technology adoption rate based on the detached homeowners' decision-making structures. In addition, we have considered policies for meeting the reduction target. This study aims to propose policies to meet the reduction target, and to contribute to the realization of a low-carbon society.

This paper proposes a new method for evaluating the eco-efficiency of a household based on Factor X, which was proposed by Yamamoto and colleagues in 1999. We had proposed methods for evaluating Factor X of a household which consists of a building and home appliances, and implemented empirical evaluations. However, there remained the following two issues to be considered. One is how to quantify the function of a household. The other is how to take account of the so-called synergy effects. It proposes the method for calculating the overall functions of one household using the purchasing price as a weighting coefficient. This method is the same as Laspeyres quantity index in economics fields. As a synergy effect, the insulating effect in the building, etc. are considered. The result showed that the annual greenhouse gas emission of a typical household drastically decreased by 52.2% from 1990 to 2009 while the aggregated function of the household slightly decreased by 0.2% during the same period so that Factor X was 2.1 with respect to global warming. It was thus shown quantitatively that Factor X of households in Japan presumably improved during the period although only limited assessments were implemented.

Indicators are partial reflections of reality. Those are necessary information we use to understand present conditions in cities, make our decisions, and plan future actions. Since environmental problems such as global warming and biodiversity loss are getting worse, the importance of urban/city assessment indicators as a mirror of current situation is increasing. Urban/City assessment indicators and tools are surveyed in this research, so that it can contribute to the realization of sustainable cities.

Two types of hydro-fluorocarbons (HFC245fa and HFC365mfc) which are the substitutes for HCFC 141b has been put in practical use as new blowing agents for polyurethane spray insulation foam jsut since 2004. In this study, we developed estimation method for aging of thermal conductivity in HFC-blown spray foam with whole skin based on experiments. Furthermore, we simulate change of heat load by heating/cooling caused by the aging with house model.