Water and Building Industry # 1982 York
In the design of district heating systems, as these become increasingly used, there is a trend towards the conveyance of heat over greater distances and its use at lower temperatures. At the same time, more plastic materials are becoming available and being developed for use at higher temperatures. Thermoplastics can be used to advantage in heat distribution systems because of their resistance to corrosion, the use of simple jointing techniques and their low weight. Furthermore, by using plastics of low rigidity, it is possible to dispense with expansion units and pipes up to 125 m diameter can be supplied in coils, thus reducing the need for joints.