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首页> 外文期刊>International Journal of Heat and Mass Transfer >State-space model for transient behavior of water-to-air surface heat exchanger
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State-space model for transient behavior of water-to-air surface heat exchanger

机译：水空表面换热器瞬态行为的状态空间模型

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摘要

Adequately representing the dynamic performance of a water-to-air heat exchanger under transient conditions would help design optimized control strategies for a high-energy-efficiency HVAC system. In this paper, the water-to-air heat exchanger is considered as a multi-input-and-multi-output system (MIMO), and the corresponding dynamic model is developed with the mass and energy balance equations based on which the state-space model for transient behavior of the heat exchanger is derived. The model has been validated by a series of dynamic response experiments including the transient responses of exit air temperature and humidity as well as exit water temperature subjected to the disturbances of inlet water temperatures (Case I: Start up the chiller; and Case HI: Stop the chiller) and a sudden change in the water flow rate (Case II: The water flow rate increases by 0.058 kg/s). The time of experimental validation on the transient response simulation is set as 1200 s in all the cases. The simulated results obtained by the state-space model have been compared with the experimental data, which shows that the state-space model developed in this study is capable of predicting the transient performance of the water-to-air heat exchangers satisfactorily (the average error is less than 15.0%). Meanwhile, the influence of input disturbances and initial conditions on the transient behaviors of the heat exchanger is discussed through the model simulation. The results show that the input disturbances and the initial conditions will produce significant influence on the proportionality coefficient of the response variables, but little influence on the time constant of the response ones.
机译：在瞬态条件下充分体现水-空气热交换器的动态性能将有助于设计用于高能效HVAC系统的优化控制策略。本文将水-空气热交换器视为多输入多输出系统（MIMO），并使用质量和能量平衡方程式建立相应的动力学模型，并根据该模型建立状态-推导了换热器瞬态行为的空间模型。该模型已通过一系列动态响应实验验证，包括出口空气温度和湿度以及出口水温度在入口水温干扰下的瞬态响应（案例I：启动冷水机组；案例HI：停止）冷却器）和水流量的突然变化（案例II：水流量增加0.058 kg / s）。在所有情况下，将瞬态响应仿真的实验验证时间设置为1200 s。将状态空间模型获得的模拟结果与实验数据进行了比较，这表明本研究开发的状态空间模型能够令人满意地预测水-空气热交换器的瞬态性能（平均值误差小于15.0％）。同时，通过模型仿真讨论了输入扰动和初始条件对换热器瞬态行为的影响。结果表明，输入扰动和初始条件将对响应变量的比例系数产生显着影响，而对响应时间常数的影响很小。

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  • 来源
  • 作者

    Ye Yao; Mengwei Huang; Jinqiu Mo; Shanqi Dai;

  • 作者单位

    Institute of Refrigeration and Cryogenics, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;

    Institute of Refrigeration and Cryogenics, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;

    Institute of Refrigeration and Cryogenics, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;

    Pan Asia Technical Automotive Center Co. it, Shanghai 201206, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    State-space model; Dynamic response; Water-to-air heat exchanger; Dry condition; Wet condition;

    机译：状态空间模型;动态响应;水-空气热交换器;干燥状态;潮湿条件;

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