ESTIMATION FOR BENEFITS OF DISTRICT HEATING AND COOLING IN COMMERCIAL AND BUSINESS AREAS

Performance evaluation according to multiple energy indicators

Abstract

 This paper describes development of district co-generation (DCG) including heat source equipment and heat spply pump, and the effect analysis by the diffusion of district co-generation system in Japanese business area. Developed model in this paper calculated DCG operation at 5-minute interval. And the effect analysis used three energy index. The estimating of district co-generation system spread effect confirmed the energy saving effect by district co-generation in Japanese business area.

 1st chapter describes a background of this paper. The city in Japan needs to construct distributed energy supply systems. And DCG is considered to be one of effective distributed energy systems, but the details of its spread effect has yet to be clarified. Therefore, we developed a DCG operation model in urban scale to the effect analysis by the diffusion of DCG system in Japanese business area.

 2nd chapter indicates the development of DCG model. We made a DCG model based on past programs. This model include Heat source equipment such as air heat pump, turbo refrigerator. And the model calculated CGS operation in 5-minute interval. Furthermore, it also considered heat supply piping length, transport power, piping heat loss in DCG calculation.

 3rd chapter is the making of three energy indexes. In order to assess energy saving effect of DCG system, This paper made the index about esannual primary energy consumption, annual life cycle CO2 emissions, and annual standard deviation of power supply and demand.

 4th chapter describes case studies. We analyzed four areas with different characteristics of located buildings. Prestage of the analysis estimated the 5-minute power demand and each heat demand for cooling and heating of each non-residential building in these target areas. Moreover, we analyzed thousands of calculation results of each area in a case study and confirmed the energy saving effect, CO2 saving effect, and power system operation stability improvement effect by DCG system in Japanese business area.

 5th chapter is conclusion. It summarizes the main points so far and shows future issues.