LIFE CYCLE INVENTORY ANALYSES FOR CO₂ EMISSION AND COST OF DISTRICT HEATING AND COOLING SYSTEMS USING WASTEWATER HEAT

Abstract

In order to evaluate effectiveness of introducing District Heating and Cooling (DHC) systems using wastewater heat, Trunk Sewer Model and DHC Plant Model have been already developed. The evaluation of the effect of wastewater temperature change which became possible with using these models was conducted, and the required wastewater flow for DHC systems using wastewater heat was calculated. Life cycle inventory analyses for CO₂ emission and cost were applied as the evaluation methods. These allowed more accurate evaluation of the CO₂ emission reduction and the analysis of economic efficiency by utilization of wastewater heat. The results of applying these models and evaluation methods to northern part of Shibaura Treatment Area show that the potential of CO₂ emission reduction is about 2.1-2.5 ton CO₂ per 10000m³ of wastewater volume in this area.