Abstract
<title>Abstract</title> <p>This study evaluates the application potential of four low-GWP HFO/ionic-liquid working pairs in absorption refrigeration systems. The NRTL activity coefficient model was used to describe the vapor-liquid equilibrium behavior of the working pairs, and thermodynamic models of single-effect and compression-assisted absorption cycles were established. The effects of generation, absorption, condensation, and evaporation temperatures on circulation ratio, solution concentration difference, COP, and exergy efficiency were analyzed. Results show that higher generation and evaporation temperatures improve cycle performance, while higher absorption and condensation temperatures reduce it. Among the investigated pairs, R1234ze(E)/[C4mim][DCA] exhibits the best overall performance. The compression-assisted cycle further enlarges the operating range and reduces the circulation ratio, showing good potential for low-grade heat-driven refrigeration.</p>