18 May 2017

O.3.2.5 Study of an Air-conditioning System Combining a Green Roof as Heat Storage Unit – Analysis of Operating Characteristic of a Reduction Model Apparatus


In recent years, urban areas in Japan have been experiencing a phenomenon called the heat island effect, which causes the temperature in cities to increase to a few degrees warmer than the surrounding suburban areas. It has attracted attention as one of many environmental issues. As a preventive measure, attention is being given to green roof projects that allow for a reduction in asphalt or concrete surface coverage in urban cities and are expected to promote the transpiration effect of plants. The author and other staff have been conducting fundamental researches by focusing on a combined system of a green roof and air-conditioning for buildings. By utilizing the green roof units as thermal storage tanks, and combining it into the building air-conditioning system which has an auxiliary heat source apparatus, a new air-conditioning system with low energy consumption can be designed, and there is the possibility that this technology could provide a solution to both the heat island effect and global warming. This paper relates to an experimental apparatus as a reduction model which we produced to evaluate the effectiveness of this compound system. The reduction model apparatus has a heat storage planter, a tank of hot water, artificial solar heat and an air conditioner. The hot water tank is united with an air-conditioning system through a heat exchanger. In this report, we perform a function usability test of this reduction model apparatus on summer mode, and report the result because utility was confirmed in analysis.