An absorption chiller cycle using HFO-1234yf (2,3,3,3-tetrafluoropropene) as an environmentally friendly refrigerant could allow for the efficient utilization of waste heat. In this study, we tested ionic liquids as absorbents for HFO-1234yf, and measured their experimental absorption equilibrium solubilities using a volumetric method. At 50 °C, the solubility of HFO-1234yf in ionic liquids increased in the order: [BMIM][Tf2N] > [BMIM][BF4] > [EMIM][PF6]. We calculated the experimental solubility of the [BMIM][Tf2N] system using the non-random two-liquid (NRTL) model and evaluated its Dühring diagram. This confirmed that the absorption chiller cycle allowed heat exchange at 0 °C with a generation temperature of 80 °C. The absorption rate was measured via a volumetric method, and increased following the absorption equilibrium solubility when the experimental temperature and pressure conditions were changed. The absorption solubility obtained at the absorber outlet was equivalent to 25–33% of the absorption equilibrium solubility in the lab-scale falling-film absorber. To improve the absorption performance, it will be necessary to investigate heat exchanger tubes with higher wettabilities to reduce the thickness of the absorbent flowing on the heat exchanger surface.

使用 HFO-1234yf（2,3,3,3-四氟丙烯）作为环保制冷剂的吸收式制冷循环可以有效利用废热。在这项研究中，我们测试了离子液体作为 HFO-1234yf 的吸收剂，并使用体积法测量了它们的实验吸收平衡溶解度。在 50  °C 时，HFO-1234yf 在离子液体中的溶解度依次增加：[BMIM][Tf2N]  >  [BMIM][BF4]  >  [EMIM][PF6]。我们使用非随机二液 (NRTL) 模型计算了 [BMIM][Tf2N] 系统的实验溶解度，并评估了其杜林图。这证实了吸收式制冷循环允许在 0  °C 下进行热交换，生成温度为 80 ℃。吸收率通过体积法测定，当实验温度和压力条件改变时，吸收率随着吸收平衡溶解度的增加而增加。在吸收器出口处获得的吸收溶解度相当于实验室规模降膜吸收器中吸收平衡溶解度的 25-33%。为了提高吸收性能，有必要研究具有更高润湿性的换热器管，以减少在换热器表面流动的吸收剂的厚度。