DEVELOPMENT OF CLEAN WATER PREHEATING SYSTEM USING HEAT EXCHANGE WITH WASTE WATER FROM BATHROOM TO IMPROVE QUALITY OF LIFE AND TO REDUCE ENERGY CONSUMPTION

2015 Fiscal Year Final Research Report

• Project/Area Number: 25420611
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Architectural environment/Equipment
• Research Institution: Osaka City University
• Principal Investigator: Nabeshima Minako 大阪市立大学, 大学院工学研究科, 准教授 (90315979)
• Co-Investigator(Kenkyū-buntansha): NISHIOKA Masatoshi 大阪市立大学, 大学院工学研究科, 教授 (40287470) ; NAKAO Masaki 大阪市立大学, 複合先端研究機構, 特命教授 (60381977) ; Farnham Craig 大阪市立大学, 大学院生活科学研究科, 講師 (60638245)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 浴室 / 排水熱回収 / 上水予熱 / 給湯用エネルギー消費量 / 実験 / 熱交換器

Outline of Final Research Achievements

With the goal of designing home bath water heat recovery systems to reduce the water heating load of hot water supply system experiments in characteristics of the heat exchanger for drainage heat recovery were performed. By using simulation model of the whole hot water supply system the heat recovery rate and primary energy consumption were estimated. As a result, it is shown that 11.36 MJ/day of primary energy consumption could be reduced.
Other experiments on hot-cold sensation and comfort for water temperatures of 14 to 45 degree C were performed on 30 test subjects. Hot-cold sensation on a 7-level vote scale strongly correlated with water temperature and skin temperature. At 28 degree C and above, there were no “cold” votes. A heat recovery system that stores warm water to save energy could also improve quality of life in winter if the set temperature is 28 degree C.

Free Research Field

都市・建築環境工学