Abstract
The application of absorption cycles for high temperature heat recovery systems calls for the investigation of new working pairs. To qualify as a potential working pair, a mixture of two substances has to fulfill stringent requirements with respect to thermodynamic properties, corrosion and safety hazards like toxicity and inflammability. Based on a thermodynamic analysis of an absorption heat pump cycle a systematic search for new working pairs has been conducted. The investigation dealt exclusively with organic compounds. To get a first estimate of the properties of mixing, a molecular group contribution model (UNIFAC) was employed. This method has so far been widely used for chemical engineering purposes and renders agreeable estimates for the thermodynamic behavior of organic mixtures. With the help of the UNIFAC method, various pairings of functional molecular groups have been investigated for their possible potential to form effective working pairs for medium and high temperature absorption heat pump cycles. As a consequence of this analysis, ten alternative working pairs are proposed and their respective theoretical performance data and their toxicity characteristics are given.
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