期刊
APPLIED THERMAL ENGINEERING
卷 179, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2020.115707
关键词
Phase change material (PCM); Poly(vinyl chloride) (PVC); Thermal conductivity; Thermal energy storage; Shape stabilized PCM
资金
- project: MF-Retrofit - Multifunctional facades of reduced thickness for fast and cost-effective retrofitting [EeB.NMP.2013-1] [609345]
- project CICECO-Aveiro Institute of Materials - national funds through the Portuguese Foundation for Science and Technology/MCTES [UIDB/50011/2020, UIDP/50011/2020]
- project CICECO - Aveiro Institute of Materials - national funds through the Portuguese Foundation for Science and Technology/MCTES [UIDB/50011/2020, UIDP/50011/2020]
- FCT - Fundacao para a Ciencia e a Tecnologia [UIDB/00481/2020, UIDP/00481/2020]
- Centro Portugal Regional Operational Programme (Centro2020), under the PORTUGAL 2020 Partnership Agreement, through the European Regional Development Fund [CENTRO-01-0145-FEDER-022083]
- University of Aveiro, FCT/MEC [FCT/UID/ECI/04450/2013]
- FCT [IF/01089/2015]
The use of poly(vinyl chloride) (PVC) structural layers incorporating phase change materials (PCM) for latent heat thermal energy storage (LHTES) has become more attractive in the recent years compared to other supporting materials. In this study, PVC layers with different types of PCM were prepared using blending and compression moulding methods. Two types of synthesized PCM, one based on paraffin and calcium carbonate (PCM@CaCO3) and the other on paraffin, silica and graphene oxide (PCM@SiGO) have been developed to enhance the thermal conductivity of the PVC matrix and thus achieve a more effective charging and discharging process. PVC layers prepared using a commercial PCM (PCM@BASF) were also prepared for comparison. SEM images and DSC results reveal homogeneous distribution of the PCM in PVC layers and that most PCM particles are undamaged. The shell material (in the case of PCM@BASF) and the shape stability (in the case of synthesized PCM@CaCO3 and PCM@SiGO) prevent leakage of molten paraffin during the PVC layer production. The thermal conductivity profile of the PVC layer without PCM have a decreasing tendency with the temperature increase when determined using different measurement approaches, the transient plane heat source method (HotDisk Analyser, TPS 2500 S) and thermal flux meter method (steady-state method). However, for PVC layers with PCM the thermal conductivity profile shows a different behaviour when the mean surface temperature of the specimen is below the phase change transition temperature range (increasing tendency). During phase change transition (18-26 degrees C), the thermal conductivity presents two distinct tendencies. Firstly, the thermal conductivity reveals a decreasing tendency as the mean temperature of the specimen rises and afterwards an increasing tendency. Secondly, when the mean surface temperature is above the phase change transition temperature range, the thermal conductivity profile shows a decreasing tendency, independent of the PCM. The mechanical properties of PVC layers were also assessed and the results obtained revealed that the incorporation of PCM into the PVC matrix reduces the mechanical performance of the composites, however for LHETS applications not subjected to high tensile stress levels (over 1 kPa), this is not a significant drawback.
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