辐射与对流复合式供冷系统热湿传递动态特性与多目标预测控制研究

Radiant and convective composite cooling is an efficient way to reduce equipment energy consumption, and to match future energy structure. However, the regulation and control problems result in its energy-saving effect much lower than expected, which has become the main bottleneck that restricting the application of this technology. The project takes the indoor thermal environment control of radiant and convective composite cooling system as studying object, using simulation and experimental method to study heat and moisture transfer dynamic characteristics of radiant and convective composite cooling system and the quantitative relationship among controlled quantity, manipulated variable and disturbance quantity. And then, build simplified internal control model for predictive control. Under the constraint of anti-condensation, the multi-objective predictive control optimization is realized. The performance of multi-objective predictive control and that of traditional PID control are compared, and the traditional control performance indexes and economic performance index are analyzed. The research of this project is not only of important scientific significance for improving the control theory of building environment and energy engineering system, but also provide strong theoretical support for improving energy saving effect of radiant and convective composite cooling system.

辐射与对流复合式供冷是降低设备能耗、与未来能源结构相匹配的有效方式，然而，调节控制问题致使其节能效果远低于预期，成为制约该项技术推广应用的主要瓶颈。本项目以辐射与对流复合式供冷系统室内热湿环境控制为研究对象，采用数值模拟和实验研究相结合的方法，研究辐射与对流复合式供冷系统热湿传递动态特性，获得被控量与操纵量、扰动量之间的定量关系；在此基础上，构建预测控制简化内部模型，在防结露约束条件下，实现多目标优化预测控制，并比较多目标预测控制与传统PID控制的控制性能优劣，分析传统控制性能指标和经济性性能指标。本项目的研究不仅对于完善建筑环境与能源工程系统的控制理论具有重要的科学意义，也将为辐射与对流复合供冷系统节能效果提升提供强有力的理论支撑。

辐射与对流复合式供冷系统的调节控制问题致使其节能效果远低于预期，是制约该项技术推广和应用的主要瓶颈。因此本研究以目前应用最为广泛的顶棚辐射结合下送风供冷系统室内热湿环境控制为研究对象，开展了以下四个方面的研究：（1）分析顶棚辐射结合下送风供冷系统热湿传递过程，构建相应的动态热湿传递模型，研究模型参数的确定方法。（2）研究顶棚辐射结合下送风供冷系统热湿传递动态特性，研究操纵量、扰动量对被控量的影响。（3）研究顶棚辐射结合下送风供冷系统多目标预测控制仿真，基于约束条件、多控制目标以及预测控制简化内部模型，开发预测控制器。（4）研究顶棚辐射结合下送风供冷系统多目标预测控制实验，逆向研究被控量对扰动量的响应。取得了以下主要成果：（1）建立了顶棚辐射结合下送风供冷系统9R5C动态热湿传递模型，通过最小二乘法进行参数辨识获得了模型的热容、热阻和对流换热系数；（2）实验验证了动态热湿传递模型的正确性以及最小二乘法进行模型参数辨识的有效性，获得了顶棚辐射结合下送风供冷系统操纵量、扰动量对被控量的影响；（3）开发了辐射与对流复合式供冷系统的带约束多目标预测控制器，并与传统的PID控制器性能比较，通过控制实验验证了先进多目标预测控制的优越性。