JAUE2012-068: The study of method of evaluating environmental infrastructure for heat-island effect

Abstract

In recent years, the heat-island effect, in which the temperature of a central area is higher than that of surrounding areas, has been confirmed in large-scale densely populated areas such as big cities. To mitigate the heat-island effect, it is effective to maintain a river and a waste heat-processing system.
In past researches, these systems have been evaluated by the amount of heat they absorb, which is usually derived a heat balance. Such an evaluation is about not the quality of energy but the quantity of energy.
In this study, a river and a waste heat-processing system are used as the environmental infrastructure. In addition to a heat balance, an "exergy-entropy process," which assesses the quality of the waste heat as well as the quality of environmental resources, is used. The purpose is to be able to evaluate environmental infrastructure from the viewpoint of the consumption of quality of resource.
The environmental infrastructure of the city was modeled to compute the consumption of exergy in process of discharging heat in the city. The results showed that it is possible to, reduce the quantity of resource consumption by urban environmental infrastructure.