Data publication: An approach for in situ fouling monitoring in heat exchangers using electrical impedance spectroscopy

The dataset presented in this study is focused on the in situ monitoring of organic fouling in a plate heat exchanger using electrical impedance spectroscopy (EIS). The primary objective was to accurately determine the thickness of fouling layers that develop over time during heat exchanger operation. The experiments were conducted using an impedance analyzer (Sciospec ISX-3) configured in a four-terminal setup with two electrodes. The counter and reference electrodes were connected to a probe positioned at the top of the chamber, while the working and sensing electrodes were connected to the heating plate of the heat exchanger. This configuration allowed for the precise measurement of impedance across the fouling layer. The amplitude of the excitation signal was set to 1 V (rms). This value was chosen to maintain linearity at high frequencies and to ensure a high signal-to-noise ratio (SNR). The impedance spectra were recorded across a frequency range of 10 Hz to 2 MHz. The spectrum included 50 measurement points that were logarithmically spaced within this range to capture detailed impedance characteristics across different frequencies. Impedance data were sampled at a rate of 45 mHz, and measurements were collected over a duration of approximately 600 minutes, allowing for continuous monitoring of the fouling development process. The raw data consists of impedance measurements, reflecting changes in the electrical properties of the fouling layer as it accumulates on the heat exchanger surfaces. The data points in the spectrum provide insights into the relationship between fouling thickness and impedance across various frequencies, which is critical for developing models to predict fouling behavior in heat exchangers.This dataset is valuable for researchers and engineers interested in non-invasive fouling monitoring techniques, offering a foundation for improving heat exchanger efficiency through real-time fouling detection and characterization.

本研究提出的数据集聚焦于利用电阻抗光谱法（electrical impedance spectroscopy, EIS）对板式换热器中的有机污垢开展原位监测。本研究的核心目标是精准测定换热器运行过程中随时间演化的污垢层厚度。实验采用配置为四端接法的阻抗分析仪（Sciospec ISX-3），搭配两枚电极：对电极与参比电极连接至腔体顶部的探针，工作电极与传感电极则连接至换热器的加热板。该配置可实现污垢层阻抗的精准测量。激励信号幅值设置为1伏（均方根，rms），选取该参数旨在维持高频段的线性度并保证较高的信噪比（signal-to-noise ratio, SNR）。阻抗光谱的采集频率范围为10 Hz至2 MHz，在此区间内以对数间隔布设50个测量点，以捕获不同频率下的精细阻抗特征。阻抗数据以45毫赫兹的速率采样，测量总时长约600分钟，可实现污垢演化过程的连续监测。原始数据包含阻抗测量值，可反映污垢在换热器表面积累过程中其电学特性的动态变化。光谱中的各数据点可揭示不同频率下污垢厚度与阻抗之间的关联，这对于构建换热器污垢行为预测模型具有关键价值。本数据集可供致力于非侵入式污垢监测技术的研究人员与工程师使用，为通过实时污垢检测与特征分析提升换热器效率提供了重要的研究基础。