Imidazolium-based ionic liquids have been reported to enhance the performance of conventional absorption working pairs; however, the effect of 1-butyl-3-methylimidazolium chloride (BMIMCl) on the LiCl/H2O system remains unclear. In this study, a novel working pair, LiCl–BMIMCl/H2O, was proposed, and the optimal mass ratio between LiCl and BMIMCl was systematically investigated. Based on the optimal mass ratio, the vapor pressure, density, viscosity, specific heat capacity, enthalpy of dissolution, and specific enthalpy were measured and calculated over a temperature range of 303.15–373.15 K and a concentration range of 40–60%. Considering both crystallization temperature and application cost, the optimal LiCl-to-BMIMCl mass ratio was determined to be 1:1. The measured data show good agreement with fitted data using the least-squares fitting method. The results of this study provide essential thermophysical property data for evaluating the feasibility of LiCl–BMIMCl/H2O as a working pair in absorption heat pump systems.
Lv et al. (Mon,) studied this question.