Investigation and testing of new polymeric-based working pairs for absorption chillers

Absorption chillers are a potential technology for using solar energy or waste heat for cooling and air-conditioning purposes. State-of-the-art working pairs require elaborate system designs and an appropriate material selection to deal with such problems as formation of non-condensable gases, corrosion, and crystallization. The investigation of alternative working pairs is one important possibility to reduce or avoid such problems. A new approach is to use linear- or hyper-branched polymers in combination with water as a working pair. A selected polymer used in this work has the capability to absorb water at suitable vapor pressure levels. Furthermore, the new working pair is expected to potentially diminish the problems of corrosion, formation of non-condensable gases, and damage of the machine due to crystallization and to relax at least the pricing situation. On the other hand, the high viscosity and the low heat conductivity compared to conventional working pairs are crucial for its application. To p...