Evaluation of CO{sub}2 reduction measures using dynamic heat load model based on observed data at the office building

摘要

In recent years, CO{sub}2 emissions by commercial sector have greatly increased. In this paper, based on long-term measurement at the office building ("Eco-Office" located at the National Institute for Environmetal Studies in Tsukuba), we have confirmed the validity of dynamic heat load model with response factor. Response factor is a well-known method of computing dynamic heat load in office buildings. However, calculation results of this method have not yet verified by the data of long-term measurement. The heat extraction calculated in this model was compared with the observed one. With this modeling, coefficients of determination in February and September were 0.77 and 0.76, respectively. Based on the above results and our developed model, we simulated energy supply and demand of office buildings. First, we examined the effectiveness of energy-saving measures installed in "Eco-Office". We found that the use of photovoltaics reduced the CO{sub}2 emissions by 54.4%. In addition, solar collector was estimated to reduce the CO{sub}2 emissions by 15.4%, insulation by 8.1%, double sash by 0.5%, total heat exchanger by 5.0%, and in total by 78.5%, respectively. Next, we estimated characteristics of the energy-saving technologies. Changing the quantity of inside heat load, we assessed the influences on CO{sub}2 emissions, by sensitivity analysis. The CO{sub}2 reduction effect by insulation was found to become not to be small with the increase in inside heat load.