CO₂ EMISSION REDUCTION POTENTIAL AND COST OF DISTRICT HEATING AND COOLING SYSTEMS USING WASTEWATER HEAT IN TOKYO 23 WARDS

Abstract

  In order to accurately evaluate effectiveness of introducing District Heating and Cooling (DHC) systems using wastewater heat, Trunk Sewer Model and DHC Plant Model were developed. Applying these models and life cycle analyses to hypothetical areas which have various heat load characteristics, it was found that a large amount of CO₂ reduction at a low CO₂ reduction cost are achieved when DHC systems are introduced in some office buildings, hotels and hospitals. Furthermore, the results of the model simulation in Tokyo 23 wards show that the potential of CO₂ reduction by utilization of wastewater heat is about 140 thousand tons of CO₂ by introducing 320 DHC systems, and its average cost is about 16,800 JPY per ton of CO₂.