DOI number:

10.1002/er.3293Copyright

Affiliation of Author(s):

西安建筑科技大学

Journal:

International Journal of Energy Research

Key Words:

phase change eutectic compound (PCM); thermal energy storage; SiC-honeycomb; quasi-encapsulated PCM; natural convection

Abstract:

The phase change eutectic compound, KNO 3 /NaNO3 (50/50 mol%) (phase change material (PCM)), which is used as thethermal energy storage material in the solar thermal power plant, was quasi-encapsulated into the SiC-honeycomb (SCH)for suppressing the natural convection occurring at the liquid state of PCM. The performance of the SCH as the materialsuppressing natural convection of PCM was investigated experimentally. PCM with three kinds of mixing ratios of SCHof 10%, 20%, and 30%, was prepared and packed in their respective stainless can with oil-flowing pipe in the center, whichis called thermal energy storage unit (TESU). Three units were linked together and stacked vertically by the connector at theinlet/outlet oil pipe. The time variation of temperature at the fixed positions inside the TESU in charging/discharging pro-cess and temperature gradient in the radial direction inside TESU when PCM was liquid state were investigated. It is con-cluded that the natural convection is suppressed by mixing the SCH with PCM up to around 30% in weight, because thePCM is quasi-encapsulated into cell holes and porous structures of SCHs. And thus, the heat transfer of the PCM + 30%SCH composite is controlled mainly by its thermal conduction, which is also supported through comparison of simulationresult with experimental one. And so, we conclude that SCH has a function as the quasi-encapsulating material for sup-pressing the natural convection of PCM. Copyright © 2015 John Wiley & Sons, Ltd.

Co-author:

Guanfei Huang,Pengcheng Shu,Hiroaki Kiriki,Shuichi Kubo,Kazushige Ohno

First Author:

Yong Li

Indexed by:

Journal paper

Correspondence Author:

Bei Guo,Takeshi Kawai

Discipline:

Engineering

Document Type:

J

Volume:

39

Issue:

6

Page Number:

727-868

Translation or Not:

no

Date of Publication:

2015-01-01

Included Journals:

SCI、EI