JAUE2018-015 The Contamination of Pipe-Surface in Geothermal Ventilation System

Abstract

Recently, global warming is progressing, and reduction of greenhouse gas CO2 is required. CO2 emissions in the civil area sector in Japan account for approximately 30%, which is about one-third of the whole of Japan. Therefore, reduction of energy consumption in houses, office and etc. is required. In order to reduce energy consumption of building, High-efficiency of machinery, high-insulation, high-airtightness and using of renewable energy are mentioned. Especially, use of geothermal energy which has almost constant temperature throughout the year is drawing attention. However, in case of geothermal ventilation system, a fungi, dust, 
pollen and etc. derived from the outside air are taken directly into the pipe. It is concerned that these cause contamination inside the pipes and breeding of molds, which may cause odors. In this study, we analyzed the contamination degree of the pipe surface in the geothermal ventilation system and proposed cleaning frequency in the pipe and cleaning method etc.