Abstract

The novel potential of hybrid phase change materials (PCM) as a mix of animal fat, specifically pork fat (lard), with edible and waste oil from the food processing industry was investigated in this paper. Lard is a relatively accessible phase change material of organic origin, with a significantly lower unit price when compared to conventional PCM materials (wholesale price of lard can be less than 0.50 €/kg). On an annual basis, a large amount of lard is thrown away because it has become inedible from a nutritional point of view. Experimental results directed that the addition of oils can improve the thermal constants of lard such as thermal conductivity, volumetric heat capacity, with the thermal diffusivity being reduced. The best result was achieved for a hybrid PCM as a combination of pork fat and waste burnt oil as the thermal conductivity was improved by 1.4% and the volumetric heat capacity by 11% with respect to the base PCM, i.e., pork fat (lard). The novel proposed hybrid PCMs are more economically viable, enabling the utilization of waste resources, and securing less environmental impact when compared to conventional PCMs as organic materials. The possible application of lard should be further investigated for specific engineering applications, such as thermal energy storage.

Graphic abstract

中文翻译：

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新型混合相变材料的实验研究

摘要

本文研究了混合相变材料（PCM）作为动物脂肪，特别是猪肉脂肪（猪油）与食品加工业的食用油和废油的混合物的新潜力。猪油是一种相对容易获得的有机相变材料，与传统的PCM材料相比，其单价要低得多（猪油的批发价可以低于0.50€/ kg）。每年，由于从营养的角度来看已经变得不可食用，因此会丢弃大量的猪油。实验结果表明，添加油可以改善猪油的热常数，如导热系数，体积热容，同时降低了热扩散系数。相对于基础PCM（即猪肉脂肪（猪油）），导热率提高了1.4％，体积热容提高了11％，将猪肉脂肪和废渣油混合在一起的混合PCM取得了最佳结果。与传统的作为有机材料的PCM相比，提出的新颖的混合PCM在经济上更可行，可以利用废物资源，并减少对环境的影响。应针对特定工程应用（例如热能存储）进一步研究猪油的可能应用。与传统的PCM作为有机材料相比，可确保对环境的影响较小。应针对特定工程应用（例如热能存储）进一步研究猪油的可能应用。与传统的PCM作为有机材料相比，可确保对环境的影响较小。应针对特定工程应用（例如热能存储）进一步研究猪油的可能应用。

图形摘要