TY - GEN
T1 - A core-shell structured PCM with Na2SO4 encapsulated by SiO2 for high temperature thermal storage
AU - Wu, Xiaodong
AU - Fan, Maohong
AU - Shen, Xiaodong
AU - Tan, Gang
N1 - Publisher Copyright:
© 2018 Begell House Inc.. All rights reserved.
PY - 2018
Y1 - 2018
N2 - In latent heat thermal storage, macro- or microencapsulation of phase change materials (PCMs) can benefit PCM performance. This work proposed a novel chemical method for microencapsulation of inorganic PCM for high temperature thermal storage. This method encapsulates Na2SO4 (PCM) with SiO2 shell via the sol-gel technique. The SiO2 shell is a fire-resistant material and can effectively inhibit the liquid leakage during solid-liquid phase change process. Comprehensively considering the thermal conductivity, thermal stability, melting temperature, and latent heat, the silica mass fraction has been optimized at 5.4% of the composite. In this encapsulation, silica particles were observed decorated on the surface of large Na2SO4 particle and perfect core-shell structures were obtained for the nano-size Na2SO4 particle. The thermal conductivity of the encapsulated Na2SO4@SiO2 has been enhanced by 21% compared to pure Na2SO4 at 800oC. The initial phase change temperature, peak temperature and latent heat of this encapsulated PCM are 885.2 oC, 887.9 oC and 170.6 J/(g. K), respectively. The TG/DSC shows that this PCM has almost no mass loss (<1 %) under calcination temperature of 1000oC. Thermophysical properties of the encapsulated Na2SO4@SiO2 varied marginally after 50 thermal cycle tests.
AB - In latent heat thermal storage, macro- or microencapsulation of phase change materials (PCMs) can benefit PCM performance. This work proposed a novel chemical method for microencapsulation of inorganic PCM for high temperature thermal storage. This method encapsulates Na2SO4 (PCM) with SiO2 shell via the sol-gel technique. The SiO2 shell is a fire-resistant material and can effectively inhibit the liquid leakage during solid-liquid phase change process. Comprehensively considering the thermal conductivity, thermal stability, melting temperature, and latent heat, the silica mass fraction has been optimized at 5.4% of the composite. In this encapsulation, silica particles were observed decorated on the surface of large Na2SO4 particle and perfect core-shell structures were obtained for the nano-size Na2SO4 particle. The thermal conductivity of the encapsulated Na2SO4@SiO2 has been enhanced by 21% compared to pure Na2SO4 at 800oC. The initial phase change temperature, peak temperature and latent heat of this encapsulated PCM are 885.2 oC, 887.9 oC and 170.6 J/(g. K), respectively. The TG/DSC shows that this PCM has almost no mass loss (<1 %) under calcination temperature of 1000oC. Thermophysical properties of the encapsulated Na2SO4@SiO2 varied marginally after 50 thermal cycle tests.
KW - Encapsulation
KW - High temperature
KW - Leakage
KW - Phase change material
KW - Thermal storage
UR - http://www.scopus.com/inward/record.url?scp=85073953373&partnerID=8YFLogxK
U2 - 10.1615/TFEC2018.ens.022311
DO - 10.1615/TFEC2018.ens.022311
M3 - 会议稿件
AN - SCOPUS:85073953373
T3 - Proceedings of the Thermal and Fluids Engineering Summer Conference
SP - 621
EP - 624
BT - Proceedings of the 3rd Thermal and Fluid Engineering Summer Conference, TFESC 2018
PB - Begell House Inc.
T2 - 3rd Thermal and Fluid Engineering Summer Conference, TFESC 2018
Y2 - 4 March 2018 through 7 March 2018
ER -