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<p>Accurately analyzing and predicting the dynamic characteristics of heat transfer systems is significant for improving the operating efficiency and stability of industrial and energy systems. This paper develops a novel dynamic model for heat exchangers (HXs) by defining the new concept of virtual dynamic Number of Transfer Unit (NTU) using the Fourier frequency-domain transformation. On this basis, we derive an analytical linear relationship between the inlet and outlet temperatures of the HX to directly characterize its dynamic heat transfer behavior. Moreover, the dynamic heat current models and inlet-outlet temperature relationships of series, parallel, and multi-loop HX networks are derived and provided to describe the dynamic performance. We conduct dual validation of the dynamic model’s accuracy through both simulations and experiments, achieving the maximum dynamic response errors for individual HX of less than 0.6% and 0.2%, respectively. By developing a parameter identification algorithm for the heat transfer system and integrating it with a complex heat exchange network experimental system, we further verify that the maximum error in dynamic performance analysis of the heat transfer system using this dynamic model does not exceed 0.4%, thereby demonstrating its accuracy and feasibility for analyzing the dynamic characteristics of heat transfer systems. The proposed model and method can serve as a powerful tool for the accurate analysis and prediction of the dynamic characteristics of heat transfer systems.</p>

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A Novel Dynamic Modeling and Analysis Method for Heat Transfer Systems Based on Frequency-Domain Transformation and Experimental Validation

  • 期刊论文

  • 发表日期：

    2026年6月17日

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  • Chao Guo,
  • Junhong Hao,
  • Wei Shao,
  • Feng Hong,
  • Xiaoze Du,
  • Qun Chen

摘要

Accurately analyzing and predicting the dynamic characteristics of heat transfer systems is significant for improving the operating efficiency and stability of industrial and energy systems. This paper develops a novel dynamic model for heat exchangers (HXs) by defining the new concept of virtual dynamic Number of Transfer Unit (NTU) using the Fourier frequency-domain transformation. On this basis, we derive an analytical linear relationship between the inlet and outlet temperatures of the HX to directly characterize its dynamic heat transfer behavior. Moreover, the dynamic heat current models and inlet-outlet temperature relationships of series, parallel, and multi-loop HX networks are derived and provided to describe the dynamic performance. We conduct dual validation of the dynamic model’s accuracy through both simulations and experiments, achieving the maximum dynamic response errors for individual HX of less than 0.6% and 0.2%, respectively. By developing a parameter identification algorithm for the heat transfer system and integrating it with a complex heat exchange network experimental system, we further verify that the maximum error in dynamic performance analysis of the heat transfer system using this dynamic model does not exceed 0.4%, thereby demonstrating its accuracy and feasibility for analyzing the dynamic characteristics of heat transfer systems. The proposed model and method can serve as a powerful tool for the accurate analysis and prediction of the dynamic characteristics of heat transfer systems.