A New Design Development of Palisaded Heat Exchanger Combined with Plastic pipes and the Innovative Application for Heat Recovery of Hot Springs Water

Abstract

A palisaded heat exchanger combined with plastic pipes was newly developed and applied for heat recovery system from hot springs. The heat exchanger was easily formed by thermal fusion bonding, which gave high heat transfer area to installation volume. The heat exchanger can be used to recover heat from corrosive hot spring water and waste water with low pH solutions or many suspended solids, although the overall heat transmission coefficients were comparatively low 65－73 W/(m2・K). Polypropylene random copolymer samples derived from the plastic pipes exhibited high tensile yield strengths even after soaking for 2-8 weeks in hot spring water.