发布时间：2023-11-30

文章标题：NH3/CO2复叠制冷系统节能控制相关研究论文被期刊《Applied Thermal Engineering》收录

内容：

课题组冯艺伟博士的研究论文Energy-saving control method for NH3-CO2 cascade refrigeration system by directly regulating slide valve position in twin-screw compressor被期刊《Applied Thermal Engineering》收录，论文的创新点在于提出了一种直接控制高温级螺杆压缩机滑阀载位的节能控制方法，有效解决了滑阀频繁动作导致的中间压力等参数波动大的问题，同时极大提升了系统COP。论文摘要如下：

Intermediate temperature (T_mid) is the pivotal parameter for energy-saving operation of existing cascade refrigeration systems (CRS), while few studies conducted on the on-site control method required to attain the optimal T_mid. This study proposes an energy-saving optimization method by the direct regulation of slide valve position in CRS high-temperature-stage (HTS) screw compressor rather than indirect regulation of T_mid. The backpropagation neural network relied on Levenberg-Marquardt algorithm is used to establish two prediction models for COP and slide valve position in high-temperature-stage twin-screw compressor (V_i). By selecting the maximum COP as the optimization objective, the optimal T_mid under each working condition is investigated. Meanwhile the corresponding optimal V_i is calculated through the data-driven model, so as to realize the direct control of the HTS volumetric flow. Compared to the traditional fixed T_mid operation, setting the T_mid as a real-time variable and control V_i through a data-driven model which correlated V_i with T_mid, can effectively avoid the significant fluctuation magnitude of V_i and T_mid. Meanwhile, the CRS can achieve an impressive energy-saving rate of up to 17.55%, and the average COP increases from 2.11 to 2.30. This study presents a novel solution that ensures the reliability operation of CRS, which is the crucial for sustainable reduction of energy consumption.