This work presents a combined experimental and thermodynamic approach used to investigate the influence of droplet injection on the performance of an ejector-based refrigeration cycle developed for Heating, Ventilation and Air-Conditioning (HVAC) applications. Thermodynamic models have been developed within MATLAB for each component of the cycle. They are validated against experimental data of an R245fa test rig installed at Hydro-Québec's Energy Technologies Laboratory (LTE). The numerical models agree fairly well with the experiments. The results show that injecting R245fa droplets at the end of the ejector diffuser with different glycol temperatures ranging from 20 to 26°C has a significant impact on the performance of the ejector itself and more interestingly on the performance of the whole cycle. It reduces especially and significantly the temperature and the pressure of the overheated vapors at the outlet of the ejector leading to a significant improvement of the thermodynamic coefficient of performance (COP) by up to 20%.

这项工作提出了一种组合的实验和热力学方法，用于研究液滴喷射对为加热，通风和空调（HVAC）应用开发的基于喷射器的制冷循环性能的影响。在MATLAB内针对循环的每个组成部分开发了热力学模型。根据魁北克水电公司能源技术实验室（LTE）安装的R245fa测试台的实验数据对它们进行了验证。数值模型与实验非常吻合。结果表明，在20至26°C范围内的不同乙二醇温度下，在喷射器扩散器的末端喷射R245fa液滴对喷射器本身的性能有重要影响，更有趣的是对整个循环的性能产生影响。