Environmentally friendly energy system models using material circulation and energy cascade - the optimization work

The objectives of this paper are to develop advanced energy management syst ems for an energy efficient and environmentally friendly society and to pro vide an assessment model for zero emission (of materials) and energy cascad e systems. This paper introduces two types of advanced energy system models : energy cascade with zero emission by material circulation and a super env ironmentally benign industrial district from the viewpoint of complete ener gy utilization and environment conservation, An assessment model is develop ed to quantify the energy saving effect from the advanced energy cascade sy stems which consist of four major industry groups and 12 subgroups in Japan , The results show that an energy saving effect of 25% could be realized fr om the zero emission and energy cascade systems, It is, moreover, found tha t the minimum fuel and energy consumption rate could be obtained from an op timum area composition of major groups. This paper develops an energy casca de balance table which indicates the material and heat flow directions from a higher potential level to a lower potential level. The table proposes cu rrent energy consumption with respect to temperature level. The proposed en ergy models demonstrate how to maximize the heat utilization among various industries. (C) 1999 Elsevier Science Ltd. All rights reserved.