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.

本研究中的数据集聚焦于采用电化学阻抗谱（EIS）对板式换热器内有机污垢进行原位监测。其核心目标是精准测定换热器运行过程中随时间累积形成的污垢层厚度。实验使用电化学阻抗分析仪（Sciospec ISX-3），采用四端双电极配置：对电极与参比电极连接至腔室顶部的探针，工作电极与传感电极则连接至换热器的加热板。该配置可实现对污垢层阻抗的精准测量。激励信号的振幅设定为1 V（均方根，rms），此值旨在维持高频下的线性特性并确保高信噪比（SNR）。阻抗谱的记录频率范围为10 Hz至2 MHz，包含50个对数间隔分布的测量点，以捕捉不同频率下的详细阻抗特性。阻抗数据的采样率为45 mHz，测量持续约600分钟，可实现对污垢形成过程的连续监测。原始数据包含阻抗测量值，反映了污垢层在换热器表面累积时其电学特性的变化。频谱中的数据点揭示了污垢厚度与不同频率下阻抗之间的关系，这对于构建换热器污垢行为预测模型至关重要。该数据集对关注非侵入式污垢监测技术的研究人员与工程师具有重要价值，为通过实时污垢检测与表征提升换热器效率奠定了基础。