Hideki Takamura

COMPARISON OF GIFU AND NAGANO'S LOCAL WOODS IN JAPANESE ALPS

We calculated the net carbon balance by subtracting CO2 emissions (fuel and electric consumption and by-products) from the amount of CO absorption and carbon fixation of Japanese Cedar and Japanese Cypress trees in Gifu prefecture and Nagano prefecture. The net carbon balance of the Japanese Cedar in Gifu prefecture was 458kg-CO2/m3 and the Japanese Cypress in Gifu prefecture was 467kg-CO2/m3. The net carbon balances of the Japanese Cedar and the Japanese Cypress in Gifu prefecture were both lower than the net carbon balances in Nagano prefecture. The fixed CO2 of the Japanese Cedar and the Japanese Cypress in Gifu prefecture were both lower than the fixed CO2 in Nagano prefecture as well. The CO2 emissions of the Japanese Cedar in Gifu prefecture were lower than those in Nagano prefecture, but the CO2 emissions of the Japanese Cypress in Gifu prefecture were higher than those in Nagano prefecture.

A COMPARISON BETWEEN ACTUALLY WEIGHED BUILDING MATERIALS AND THE WEIGHT OF BUILDING MATERIALS CALCULATED USING BLUEPRINTS

We analyzed the difference in weight between construction materials that we measured and those calculated from blueprints for four different houses. Next, we determined the coefficient used to calculate CO2 emissions based on the calculation using the actual measurements and those measurements taken from the blueprints. The following results were obtained.1) The weights of the construction materials used in the bases, the building frames and the roofs that were calculated from blueprints were both heavier and lighter than the actual measured values. The weights of the materials used in the outside walls that were calculated from blueprints tended to be lighter than the actual measured values.2) Our calculated coefficients are 98.5%～102.5% for the bases, 97.7%～105.9% for the building frames, 102.7%～-116.3% for the roofs and 126.1%～137.7% for the outside walls.

A COUNTERMEASURE AND ASSESSMENT FOR REDUCING CO2 EMISSIONS CONNECTED WITH THE CONSTRUCTION OF DETACHED WOODEN HOUSES

This paper focuses on how to reduce CO2 emissions regarding construction materials. We compared section by section the amount of CO2 emissions from the four different houses. Next, we made an improved plan that took away the first floor that was constructed with reinforced concrete, as well as the interior decorations which emitted less CO2 during their factory production. The following results were obtained.1) We determined which sections of the four houses had less construction waste. We determined which sections of the four houses emitted less CO2 during their production.2) The total amount of CO2 emissions per floor from construction materials is 318.8kg-CO2/m2～498.1kg-CO2/m2.3) The proposed countermeasure that took away the first floor reduced CO2 emissions by 15.7×103kg-CO2, a decrease of 30.4%.The proposed countermeasure that used the interior decorations, which emitted less CO2 during their factory production, reduced CO2 emissions by 5.1×103kg-CO2, a decrease of 9.9%.The countermeasure that the authors described in their improved plan reduced CO2 emissions by 20.8×103kg-CO2, a decrease of 40.3%.