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A Comparative Study on the Thermal Energy Storage Performance of Bio-Based and Paraffin-Based PCMs Using DSC Procedures

机译：基于DSC程序的生物基和石蜡基PCM的热能存储性能的比较研究

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摘要

Thermal-Energy Storage (TES) properties of organic phase change materials have been experimentally investigated and reported in this paper. Three paraffin-based Phase Change Materials (PCMs) and one bio-based PCM are considered with melting temperatures of 24 °C, 25 °C and 26 °C. Sensible heat storage capacities, melting characteristics and latent heat enthalpies of the studied PCMs are investigated through Differential Scanning Calorimetry (DSC) measurements. Two alternative methods, namely the classical dynamic DSC and a stepwise approach, are performed and compared with the aim to eliminate and/or overcome possible measurement errors. In particular, for DSC measurements this could be related to the size of the samples and its representativity, heating rate effects and low thermal conductivity of the PCMs, which may affect the results and possibly cause a loss of objectivity of the measurements. Based on results achieved from this study, clear information can be figured out on how to conduct and characterize paraffin and bio-based PCMs, and how to apply them in TES calculations for building applications and/or simulations. It is observed that both paraffinic and bio-based PCMs possess a comparable TES capacity within the selected phase transition temperature, being representative for the human thermal comfort zone. The phase change of bio-based PCMs occurred over a much narrower temperature range when compared to the wider windows characterizing the paraffin-based materials. Bio-based PCMs turned out to be very suitable for building applications and can be an environmentally friendly substitute for petroleum-based PCMs.
机译：本文已经对有机相变材料的热能存储（TES）特性进行了实验研究并进行了报道。考虑了三种基于石蜡的相变材料（PCM）和一种基于生物的PCM，其熔融温度分别为24°C，25°C和26°C。通过差示扫描量热法（DSC）测量来研究所研究的PCM的显热储能，熔化特性和潜热焓。执行并比较了两种替代方法，即经典动态DSC和逐步方法，目的是消除和/或克服可能的测量误差。特别是，对于DSC测量，这可能与样品的大小及其代表性，加热速率效应和PCM的低导热率有关，这可能会影响结果并可能导致测量的客观性丧失。根据这项研究获得的结果，可以就如何进行石蜡和基于生物的PCM进行表征和特性，以及如何将其应用于建筑应用和/或仿真的TES计算中获得清晰的信息。可以观察到，石蜡基和生物基PCM在选定的相变温度范围内都具有可比的TES容量，代表了人类的热舒适区。与表征石蜡基材料的较宽窗口相比，生物基PCM的相变发生在更窄的温度范围内。事实证明，基于生物的PCM非常适合建筑应用，并且可以替代基于石油的PCM。

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