Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7061931 | Thermochimica Acta | 2018 | 10 Pages |
Abstract
As a promising functional latent-heat fluid, phase change emulsion suffers from high supercooling and low thermal conductivity, yet no satisfactory solution for both problems has been reported. We firstly proposed a solution to the problems of 20â¯wt% paraffin emulsion(PE) in medium temperature range (40-80â¯Â°C) with graphene as additive. After adding graphene, the supercooling degree dropped from 14.23 to 0.27â¯Â°C, while the latent heat changed by less than 2Jâ¯gâ1(3%), and the thermal conductivity increased by 20.22%. The size of the emulsion particles with or without graphene, which was originally between 200 and 1500â¯nm, only changed within 5% after 300 melting/freezing cycles. DSC test showed the graphene-added composite PE(GPE) had good stability with only changed 1.53%, 3.14% in latent heat and 1.45% in phase change temperature after 300 cycles. Therefore, this new emulsion with high heat storage capacity, good thermal performance, and high stability, will exhitat remarkable potential in thermal energy storage.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Fluid Flow and Transfer Processes
Authors
Nan Xiang, Yanping Yuan, Liangliang Sun, Xiaoling Cao, Juan Zhao,