离子液体型吸收式制冷工质对的热物理性质研究

在吸收式制冷循环中，以离子液体作为新型吸收剂的研究方兴未艾。工质对的热物性数据是开展吸收式循环理论研究与工程实践的基础。本项目围绕离子液体与制冷剂二元混合物的黏度与密度展开实验与理论研究。实验方面，基于毛细管法和振动管法，建立一套可同时测量二元混合物黏度与密度的实验平台（压力范围0.1-15MPa、温度范围273.15-433.15K，密度与黏度测量不确定度分别小于1%和3%），获得黏度与密度测量数据，并从宏观上研究混合组分、温度及压力等对黏度与密度的影响规律；微观上，利用光谱仪，分析混合物中特征基团、化学键位，特别是氢键的变化对黏度与密度的影响规律，揭示混合物结构变化与宏观物性的内在联系。理论方面，结合实验研究，构建可推算离子液体与制冷剂二元混合物黏度与密度的理论模型。本项目的开展将拓宽离子液体与制冷剂混合物的热物理性质研究，为离子液体吸收式循环的理论研究和工程实践提供参考依据。

Ionic liquids (ILs) as the novel alternative absorbent for the absorption refrigeration cycle have been attracted increasing attention in the recent years. The thermophysical properties of the working pairs are required and essential for the theoretical study and application of the absorption cycle. In this project, the experimental and theoretical study on the viscosity and density for the binary mixtures of ILs with refrigerants will be conducted. In the experimental study, a new apparatus will be developed based on the capillary viscometer and the vibrating-tube densimeter (the pressure range from 0.1 to 15 MPa, the temperature range from 273.15 to 433.15 K, and the experimental uncertainties of the density and viscosity less than 1% and 3%, respectively). The viscosities and densities will be obtained using the apparatus. Moreover, the factors influenced the viscosity and density, including the temperature, the pressure and the component of the mixture, will be investigated. The spectrograms will be acquired using the spectrometers to study the effects of the characteristic groups and chemical bonds in the mixture, especially of the hydrogen-bonding on the viscosity and density. The relationship between the structural changes of the mixtures and the thermophysical properties will be analyzed. In the theoretical study, based on the experimental results, the model will be modified for the application to the mixtures containing ILs and the refrigerants. This study will broaden the research on the thermophysical properties for the binary mixtures of ILs with refrigerants as well as provide the foundation for the theoretical research and the application of the absorption cycle using IL-based working pairs.