Experimental study on melting performance of paraffin and paraffin/expanded graphite

被引：0
作者：
Liu Z. [1 ,2 ]
Zhang X. [1 ,2 ]
Wang C. [1 ,2 ]
Zhang M. [1 ]
机构：
[1] School of Energy and Environment, Southeast University, Nanjing, 210096, Jiangsu
[2] Shenzhen Research Institute of Southeast University, Shenzhen, 518000, Guangdong
来源：
Huagong Xuebao/CIESC Journal | 2020年 / 71卷 / 07期
关键词：
Composites; Expanded graphite; Heat transfer; Horizontal shell and tube; Melting performance; Phase change; Weighting method;
D O I：
10.11949/0438-1157.20191527
中图分类号：
学科分类号：
摘要：
To improve the melting performance of paraffin (PA) during the phase change energy storage process, a small amount of expanded graphite (EG) was added to the PA to prepare four kinds of paraffin/expanded graphite composite phase change materials (PA-EG). The PA-EG with suitable proportion was screened out by thermophysics analysis, with melting process of PA-EG and PA in the horizontal shell and tube latent heat thermal energy storage unit being experimentally studied. Based on the changes in the temperature field of the phase change material and the weighted melting fractions calculated, the melting performance between PA and PA-EG was compared. Also, the effect of the heating temperature on the melting performance was explored. The results indicated that the thermal conductivity of PA-EG3 was 7 times higher than that of PA, while the phase transition temperature and latent heat remained relatively identical. The natural convection effect of PA-EG3 during melting was weaker than that of PA. However, higher thermal conductivity resulted from added EG could significantly improve the melting of middle and lower parts in the latent heat thermal energy storage unit, making its overall melting rate higher than that of pure PA. When the heating temperature was 80℃, the melting process of PA-EG3 is 78.16% shorter than that of PA. In addition, reduced heating temperature can significantly increase the complete melting time of PA and PA-EG3, with smaller increment for PA-EG3 under the same condition. © All Right Reserved.
引用
收藏
页码：3362 / 3371
页数：9
相关论文
共 38 条
[1]  
Seddegh S, Wang X, Henderson A D, Et al., Solar domestic hot water systems using latent heat energy storage medium: a review, Renewable and Sustainable Energy Reviews, 49, pp. 517-533, (2015)
[2]  
Li C, Zhang B, Xie B, Et al., Stearic acid/expanded graphite as a composite phase change thermal energy storage material for tankless solar water heater, Sustainable Cities and Society, 44, pp. 458-464, (2019)
[3]  
Jin X, Medina M A, Zhang X., Numerical analysis for the optimal location of a thin PCM layer in frame walls, Applied Thermal Engineering, 103, pp. 1057-1063, (2016)
[4]  
Veerakumar C, Sreekumar A., Thermo-physical investigation and experimental discharge characteristics of lauryl alcohol as a potential phase change material for thermal management in buildings, Renewable Energy, 148, pp. 492-503, (2020)
[5]  
Melone L, Altomare L, Cigada A, Et al., Phase change material cellulosic composites for the cold storage of perishable products: from material preparation to computational evaluation, Applied Energy, 89, 1, pp. 339-346, (2012)
[6]  
Zhang X L, Xu X F, Zhou S X, Et al., Research progress of cold storage technology in cold chain logistics, Refrigeration and Air-Conditioning, 17, 12, pp. 88-92, (2017)
[7]  
Agyenim F, Hewitt N., The development of a finned phase change material (PCM) storage system to take advantage of off-peak electricity tariff for improvement in cost of heat pump operation, Energy and Buildings, 42, 9, pp. 1552-1560, (2010)
[8]  
Teamah H M, Lightstone M F., Numerical study of the electrical load shift capability of a ground source heat pump system with phase change thermal storage, Energy and Buildings, 199, pp. 235-246, (2019)
[9]  
Lazrak A, Fourmigue J, Robin J., An innovative practical battery thermal management system based on phase change materials: numerical and experimental investigations, Applied Thermal Engineering, 128, pp. 20-32, (2018)
[10]  
Diani A, Campanale M., Transient melting of paraffin waxes embedded in aluminum foams: experimental results and modeling, International Journal of Thermal Sciences, 144, pp. 119-128, (2019)
1234