Thermodynamic Properties of Ternary Lithium Bromide Solution Mixed with Ionic Liquid as Working Pairs for Absorption Heat Transformer

Résumé fourni par la source

Absorption heat pumps are categorized into two main types: absorption heat pumps (AHPs) and absorption heat transformers (AHTs). AHT is defined as a system that upgrades medium-temperature heat to higher temperatures for industrial applications. So far, the majority of research on working pairs has been concentrated in the medium-to-low temperature range of AHPs, this research delves into the thermodynamic evaluation and performance metrics of ternary working pairs designed for high-temperature absorption heat transformers. The integration of ionic liquids (ILs) with conventional H 2 O/LiBr mixtures aims to overcome the drawbacks of traditional working pairs, including issues like corrosion and toxicity. The corrosion rates of eight ternary IL working pairs were measured under high-temperature conditions. After a preliminary evaluation of short-term corrosion measurements, four working pairs with lower corrosiveness were selected for further thermodynamic analysis. The results indicate that the ternary working pairs containing [EPy][Br] and [BMIM][I] exhibited lower viscosity, but their specific heat capacities were notably lower compared to the working pair containing [EMIM][Ac]. Furthermore, the ternary working pair containing [EMIM][MeSO 3 ] showed significantly higher corrosiveness than the other three pairs. Based on this analysis, the ternary working pair formed by adding [EPy][Br] to the conventional LiBr solution demonstrates greater potential for application in high-temperature AHT systems.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.