最小焓差在空调节能控制系统中的应用及仿真

在空气调节过程中不仅需要考虑房间内人员的舒适性需求，同时还需考虑如何节省能源。基于焓值理论将最小焓差算法与风阀开度调节过程相结合，使得进入空气处理单元前的空气更加接近舒适区域，然后基于质量及能量守恒理论推导出空气混合过程的数学模型，最后利用SIMULINK建立了空调系统仿真模型，并对所提控制策略从节能效果与舒适性能指标2个方面进行仿真验证。仿真结果表明最小焓差＋PID策略联合控制的空调系统不仅能够获得更佳的空气舒适状态而且系统耗能更少。

Application and Simulation of HVAC Energy saving ControlSystem by Least Enthalpy Difference

In the process of air-conditioning, not only the thermal comfort but also energy saving should be considered. A method, which combines a least enthalpy difference（LED） and mixing air ratio based on the theory of enthalpy, can help to approach to comfortable zone for the air before coming into air handling unit （AHU）. Then several mathematic equations of mixing process were derived based on laws of conservation of mass and energy. Eventually, the models of HVAC were established under SIMULINK environment. And the control strategies are validated in the aspects of improving comfortable effect and saving energy. It is found that LED-based PID controller can achieve the requirements of better thermal comfort and energy efficiency.