Greenhouse Effect Analysis of Water and Material Cycles System and Natural Energy Utilization on the Sustainable Marine City

Abstract

Sustainable Marine City (SuMaC) is proposed as an experimental island of 800-900 ha with 39,000 residents for marine environmental education, research, and preservation of Osaka Bay. As a series of studies, energy utilization and water/material cycle systems for SuMaC were evaluated by the emission of greenhouse effect gas in this study. Use of recycling water inferred decrease in the water consumption by 25.9%. Considering the difference in time between supply and demand, electric self-sufficiency was estimated to be 90.6%. Moreover, it was suggested that self-sufficiency on hot water, cooling, and heating energy was 78.2%, 41.9%, and 45.2%, respectively. The emission of the green house effect gas from the systems proposed is inferred lower than that from a typical city by 2.30×10^5 t-C for 30 years.