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现行 4679 – Dynamic Modeling and Control of Multi-Evaporator Air-Conditioning Systems
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Dynamic Modeling and Control of Multi-Evaporator Air-Conditioning Systems 多蒸发器空调系统的动态建模与控制
本文提出了一种新的多蒸发器空调循环动态建模方法。所得到的模型适用于为这些系统设计先进的闭环控制器。本文提出了一种通用的建模方法,适用于具有任意数量蒸发器的商用机组。针对压缩机转速和膨胀阀开度的阶跃输入,对实验双蒸发器系统的数据进行了模型验证,结果显示了良好的预测精度。 这些模拟研究中观察到的开环行为清楚地表明了不同蒸发器动态变量之间的交叉耦合效应。最后,讨论了基于该模型和系统特点的闭环控制策略,并对两种蒸发器的压力和过热控制策略进行了比较。单位:双引文:ASHRAE交易,第110卷,pt。1.
This paper presents a new methodology for the dynamic modeling of multi-evaporator air-conditioning cycles. The resulting model is suitable for designing advanced closed-loop controllers for these systems. A generalized modeling approach is developed, which is applicable to commercially available units with any number of evaporators. Model validation against data from an experimental dual-evaporator system for step inputs to compressor speed and expansion valve opening is also presented, and the results show good prediction accuracy. The open-loop behavior observed in these simulation studies clearly indicates the effect of cross-coupling between dynamic variables of different evaporators. Finally, closed-loop control strategies based on the model and the system characteristics are discussed, and comparison of two control strategies for control of pressure and superheat of the two evaporators is also presented.Units: Dual
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