本文提出了一种新颖的油循环观测器来估计制冷剂压缩机中的油浓度和油量。这种基于模型的动态观测器基于空调或制冷系统部件的油模型。本文开发了暖通空调和制冷系统部件的油模型，以估算每个部件中的油质量和制冷剂质量。利用所有的组分油模型和两个热交换器动态观测器，通过集成所有的组分模型，建立了一个系统级的动态观测器，该观测器提供了两相流热交换器内部几何长度的估计。通过实验验证了该动态观测器在稳态运行和动态过程中的性能。本文对油循环观测器的研究对住宅和商业用风系统的安全可靠运行有直接的应用- 空调和制冷系统。单位:SICitation:ASHRAE交易，第110卷，pt。2.

This paper presents an innovative oil circulation observer to estimate oil concentration and oil amount in refrigerant compressors. This model-based dynamic observer is based on oil models for the components of an air-conditioning or refrigeration system. Oil models for HVAC&R components are developed in this paper to estimate oil mass and refrigerant mass in each component. Using all of the component oil models and both heat exchanger dynamic observers, which provide the estimation of inner geometric lengths of two-phase-flow heat exchangers, a system-level dynamic observer is established by integrating all of the component models. Experimental testing has been conducted to verify the performance of this dynamic observer for steady-state operation and dynamic processes. This research on the oil circulation observer has direct applications for safe and reliable operation of residential and commercial air-conditioning and refrigeration systems.Units: SI