樹脂製栅状熱交換器，温泉水を用いた給湯予熱システムに関する研究: 第1報——樹脂製柵状熱交換器の概要と初期性能評価

摘要

本論文は，樹脂製柵状熱交換器と温泉水を利用した給湯予熱システムに関する一連の研究の第1報であり，温泉熱の回収にあたって従来の金属製プレート式熱交換器の課題であった金属部材の腐食や目詰まりを解決する樹脂製柵状熱交換器を開発し，その初期性能評価を行ったものである.樹脂製柵状熱交換器は，水平向きに配置した上部ヘッダ管，下部へッダ管に孔を開け，そこに縦に細管を40本熱融着させた8枚，9枚のパネルを水平向きに配置した連通管で連結させた2つのユニットで構成されており，それぞれが互い違いに挟み込める構造となっている.それを温泉の源泉や排湯配管系統に設置した槽に浸漬することによって熱交換する.樹脂製柵状熱交换器の熱通過率は65～73W/(m~2·K)であり，金属のプレート式や管状熱交換器よりも劣るが，PHが低く腐食の懸念がある，浮遊物質が多く目詰まりする等，金属製の熟交換器で熱回収が難しい温泉や排湯にも対応できる.%This paper constitutes Part 1 in a series of studies on preheating hot water supply systems using a palisaded heat exchanger combined with plastic pipes and hot spring water. The palisaded heat exchanger was newly developed, and the initial plan was for it to utilize hot springs as a sustainable source of energy and solve the corrosion or clogging problem in metal plate heat exchangers. The exchanger consists of two units that sandwich each other alternately. The units consist of eight or nine panels connected by horizontal pipes. The panels are formed by thermal fusion bonding between 40 narrow longitudinal pipes and upper and lower horizontal header pipes with bored holes. Heat exchange is initiated by soaking the exchanger in a tank with hot spring water or waste hot water. The width, height, and depth of the prototype exchanger are 893, 1023, and 560 mm, respectively. The overall heat transmission coefficient of the exchanger is 65-73 W/(m~2·K). Though this value is less than that of the metal plate or tube-type heat exchanger, the exchanger appears to work well when heat recovery from the following types of springs is carried out: springs that corrode metal because of the low pH value and springs with plenty of suspended solids, such as waste hot water from the spa facilities.