JAUE2014-048 Evaluation of reduced energy use resulting from a DHC network in the Shinjuku DHC area

Abstract

Reduced energy use and low carbon emissions by cities are important, and area-wide energy usage is an effective way to achieve these goals. District heating and cooling (DHC) is a typical form of area-wide energy usage. However, declining efficiency is a concern for heat source equipment that has been in operation for a long period of time. Therefore, facilities have to be updated or heat transfer has to be facilitated (connections to plants) in order to make an existing DHC network more efficient.
 This study analyzed and evaluated how effectively the DHC network between the Nishi-Shinjuku 1-chome area 
and the Shinjuku Shin-toshin area reduced energy use. This network began transferring chilled water between the 2 areas in Shinjuku Ward, Tokyo starting in 2013. Results revealed that the DHC network resulted in about a 5 % 
reduction in the primary energy input per year in the area studied.