A novel composite PCM for seasonal thermal energy storage of solar water heating system

Wei Wu, Xiaoyu Wang, Man Xia, Yiping Dou, Zhengyu Yin, Jun Wang and Ping Lu

Renewable Energy, 2020, vol. 161, issue C, 457-469

Abstract: This paper presents a novel composite phase change material (PCM) with two phase transition temperatures (PTTs), which can be used in solar water heating system (SWHS) to accomplish the demand for seasonal thermal energy storage. A three-dimensional (3D) numerical model of evacuated tube collector (ETC) is established. An outdoor test rig has been fabricated to validate the numerical analysis. Differential scanning calorimetry (DSC) is employed to measure the thermal properties of PCMs. The numerical analysis shows that the natural convection effect cannot be ignored. The temperature gradients calculated in the axial direction during the solid sensible heating and phase change periods are respectively 0.02% and 1.7% of that in the radial direction in summer, 0.1% and 1% in winter, which indicates that the heat transfer is essentially in a two-dimensional (2D) way in these two periods. The DSC test illustrates that the enthalpy and PTT of the composite PCM are mainly affected by the component of single PCM with high PTT. Both the test and simulation show that CA/62, the combination of capric acid (CA) and #62 paraffin, can reach two quite different PTTs, to make it a suitable one in terms of seasonal thermal energy storage in SWHS.

Keywords: Composite phase change material; Seasonal thermal energy storage; Evacuated tube collector (ETC); Solar water heating system (SWHS); Heat pump (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (10)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:161:y:2020:i:c:p:457-469

DOI: 10.1016/j.renene.2020.06.147

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