摘要
To explore the application performance of 1-Ethyl-3-methylimidazolium based ionic liquids in absorption heat transformers, this study measured the saturated vapor pressure of 1-Ethyl-3-methylimidazolium chloride and 1-Ethyl-3-methylimidazolium methanesulfonate solutions at different concentrations and the specific heat capacity of their pure substances at 25–200 °C. Using the Non-Random Two-Liquid activity coefficient model and enthalpy calculation equations, the measured data were correlated with an absorption heat transformer model. A sensitivity analysis was conducted focusing on condensation temperature, evaporation/generation temperature, and absorption temperature, with a comparison to the traditional LiBr + H 2 O working pair. Results indicated that the LiBr + H 2 O working pair performs well under conventional temperature conditions. However, the ionic liquid working pairs demonstrate a broader viable temperature range, showing stable performance when the condensation temperature is below 81 °C, the evaporation/generation temperature exceeds 108 °C, and the absorption temperature is below 197 °C. Furthermore, comparing the optimal coefficient of performance and exergy performance coefficient data with their corresponding absorption temperatures revealed that 1-Ethyl-3-methylimidazolium methanesulfonate + H 2 O working pair exhibits the best performance when the absorption temperature exceeds 195 °C, with the ability to maintain coefficient of performance and exergy coefficient of performance values of 0.21 and 0.37, respectively, even at an absorption temperature of 240 °C. This study accurately measured the thermophysical properties of the 1-Ethyl-3-methylimidazolium based ionic liquid + H 2 O working pairs under high-temperature conditions, providing crucial insights into their application in absorption heat transformers. It outlines their benefits and limitations compared to traditional working pairs, thus paving the way for future research.
危险品化学品经营许可证（带存储）