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气液溶解度是混合工质体系重要的热力学性质，对替代工质的热物性研究及制冷空调的设计优化、运行和长期可靠性都非常重要。该文基于等体积饱和法搭建了气液溶解度实验平台，主要包括气体腔系统、平衡釜系统、温度测量系统、压力测量系统、磁力搅拌系统和恒温系统，实验系统测量范围为243～373 K、0～5 MPa。利用CO2在正癸烷中的溶解度对实验平台进行了可靠性验证，实验结果表明，该实验平台是可靠的。基于该实验平台开展了R1234ze(E)在POE基础油中的溶解度教学案例研究，并采用PR-Wilson模型对溶解度实验数据进行了拟合关联，偏差基本在3.0%以内。通过该实验教学，能够帮助学生理解气液过程中的溶解特性，激发学生学习的主观能动性，提升“制冷技术”课程的教学效果。
Abstract：[Objective] Under the dual pressures of energy conservation and environmental protection, environmentally friendly refrigerants must exhibit excellent thermal performance, environmental compatibility, safety, and economy, along with adequate lubricant oil solubility. The solubility of refrigerant in oil alters the working viscosity, anti-friction, and anti-wear properties of the lubricant while ensuring miscibility, ultimately affecting compressor performance and lifespan. This solubility represents a key phase equilibrium property of mixtures and a critical parameter for evaluating refrigeration system performance.[Methods] A solubility apparatus was developed using the isochoric saturation method, comprising a gas chamber system, equilibrium cell system, temperature/pressure measurement systems, magnetic stirrer, and thermostat. The system measures gas solute solubility in liquid solvents at 243–373 K and pressures ≤5 MPa. Based on error propagation theory, the combined uncertainty at a 95% confidence level(k=2) was 2.8% for pressures ≤5 MPa. Carbon dioxide and n-decane served as reference fluids for validation. Using this experimental teaching platform, R1234ze(E) refrigerant solubility in ISO VG 68 polyol ester(POE) base oil was studied as a demonstration case. Experimental solubility data were compared with published values. [Results] Deviations between experimental and literature data for reference fluids fell within the apparatus uncertainty, confirming reliability. R1234ze(E) solubility in POE base oil was measured at 283–353 K and≤1.2 MPa(56 data points). Solubility increased with pressure and decreased with temperature. The Peng-Robinson(PR) equation of state coupled with the Wilson activity coefficient model(PR-Wilson) correlated the data well, with deviations ≤3.0%. For R1234ze(E) in POE oil, the absolute average and maximum absolute deviations between experimental and calculated pressures were 1.56% and 2.71%, respectively, demonstrating the model's effectiveness. Solubilities in POE oils of identical viscosity grades were comparable, while higher oil viscosity reduced solubility at fixed pressure/temperature conditions. [Conclusions] The experiments enhanced teaching quality by helping students understand gas-liquid dissolution characteristics, boosting learning engagement, and improving "Refrigeration Technology" course outcomes. Students gained proficiency in Origin and MATLAB, advancing their research literacy. Innovative teaching methods proved effective for talent development. Further refinements will optimize the experiment's feasibility for undergraduate teaching.
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Basic Information:
DOI：10.16791/j.cnki.sjg.2025.07.028
China Classification Code:TB61-4;G642.423
Citation Information:
[1]贾涛,杨锦鹏,江巍雪等.气液溶解度实验教学平台研制与教学应用[J].实验技术与管理,2025,42(07):216-223.DOI:10.16791/j.cnki.sjg.2025.07.028.
Fund Information:
江苏省自然科学基金青年基金项目(BK20230596); 建筑能效控制与评估教育部工程研究中心开放课题(AHJZNX-2024-); 扬州大学2022年校教改研究课题项目(YZUJX2022—C12,YZUJX2022—C11)