Effective one-dimensional dynamic modelling of latent heat thermal energy storage units for heating applications

IF 1.6 Q4 ENERGY & FUELS IET Energy Systems Integration Pub Date : 2023-12-19 DOI:10.1049/esi2.12128
Hector Bastida, Ivan De la Cruz-Loredo, Carlos E. Ugalde-Loo
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Abstract

Effective use of the energy stored within thermal energy storage systems requires mathematical models that faithfully represent the dynamics of interest. Although three-dimensional or two-dimensional models may provide an accurate representation of the thermal store, these are computationally intensive and may not be suitable for control system design or to simulate complex networks. Following this line, a low-order one-dimensional model of a latent heat thermal store is presented. The model is based on energy balance, the specific heat–temperature curve of the storage medium, and the dynamic calculation of the heat transfer coefficient. The simplicity afforded by the model facilitates its implementation in any programming language, guaranteeing its compatibility with commercial software to simulate complex systems. The model was implemented in MATLAB/Simulink and verified against experimental data of the real unit and simulation results obtained with a two-dimensional model. Simulation results for charging and discharging operations obtained with the one-dimensional model exhibit a root mean square error of ≤0.53 °C and a mean square error of ≤0.32 °C when compared with experimental results of the output temperature of the heat transfer fluid. These outcomes are deemed acceptable considering the low order of the one-dimensional model.

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供热用潜热蓄热装置的有效一维动态建模
要有效利用热能储存系统中储存的能量,需要建立能忠实反映相关动态的数学模型。虽然三维或二维模型可以准确地表示热存储,但这些模型的计算量很大,可能不适合控制系统设计或复杂网络的模拟。根据这一思路,本文提出了一种低阶一维潜热蓄热器模型。该模型基于能量平衡、存储介质的比热-温度曲线以及传热系数的动态计算。该模型简单易用,可以用任何编程语言实现,保证了与模拟复杂系统的商业软件的兼容性。该模型在 MATLAB/Simulink 中实现,并根据实际设备的实验数据和二维模型的模拟结果进行了验证。与导热液体输出温度的实验结果相比,一维模型获得的充放电操作模拟结果的均方根误差≤0.53 °C,均方误差≤0.32 °C。考虑到一维模型的阶数较低,这些结果是可以接受的。
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来源期刊
IET Energy Systems Integration
IET Energy Systems Integration Engineering-Engineering (miscellaneous)
CiteScore
5.90
自引率
8.30%
发文量
29
审稿时长
11 weeks
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