Equipment reliability, efficiency, charge migration, and refrigerant charge optimization of refrigeration systems has been widely emphasized as critical development focus. Numerous modeling tools are utilized to predict charge of oil and refrigerant in refrigeration systems during system design. However, there is a lack of experimental validation data to confirm the accuracy of these models. The sampling technique presented in this paper allows the separate measurement of refrigerant and oil charge. An accompanying heat exchanger volume measurement technique was utilized to estimate heat exchanger volume and required measurement accuracy. The high accuracy, simple, and comparatively fast measurement technique enables collection of high-fidelity experimental data efficiently, to be used to validate charge models. Key components which are crucial to implement the technique include a removable heat exchanger charge test module and a modular duct assembly. A test plan using a Box-Behnken design of experiments was developed that maximizes test effort effectiveness by minimizing the number of tests required for thorough model validation.

制冷系统的设备可靠性，效率，进料迁移和制冷剂进料优化已被广泛强调为关键的开发重点。在系统设计过程中，许多建模工具可用于预测制冷系统中的油和制冷剂充注量。但是，缺乏实验验证数据来确认这些模型的准确性。本文介绍的采样技术可以分别测量制冷剂和机油量。利用随附的热交换器体积测量技术来估算热交换器体积和所需的测量精度。高精度，简单且相对较快的测量技术可以有效地收集高保真实验数据，以用于验证电荷模型。实施该技术至关重要的关键组件包括可移动的热交换器充气测试模块和模块化管道组件。开发了使用Box-Behnken实验设计的测试计划，该计划通过最小化全面模型验证所需的测试次数来最大化测试工作效率。