Next Article in Journal
A Highly Efficient Indirect P. pastoris Surface Display Method Based on the CL7/Im7 Ultra-High-Affinity System
Previous Article in Journal
Self-Assembly Properties of Cationic Gemini Surfactants with Biodegradable Groups in the Spacer
Previous Article in Special Issue
Tests on Material Compatibility of Phase Change Materials and Selected Plastics
Article Menu

Export Article

Open AccessArticle
Molecules 2019, 24(8), 1482; https://doi.org/10.3390/molecules24081482

Stearic Acid/Inorganic Porous Matrix Phase Change Composite for Hot Water Systems

Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
*
Author to whom correspondence should be addressed.
Academic Editor: Ana Ines Fernandez Renna
Received: 19 March 2019 / Revised: 12 April 2019 / Accepted: 14 April 2019 / Published: 15 April 2019
(This article belongs to the Special Issue Phase Change Materials)
  |  
PDF [5783 KB, uploaded 15 April 2019]
  |  

Abstract

The storage and utilization of waste heat in low and medium temperature ranges using phase change materials (PCMs) is an effective technology to improve energy utilization efficiency in combined cooling, heating, and power (CCHP) systems. In this paper, stearic acid/inorganic porous matrix phase change composites were developed to store waste heat for hot water systems. Among them, stearic acid/expanded graphite (EG) phase change composite was highlighted and the thermal physical properties, the dynamic response, and the long-term cyclic stability were evaluated. The stearic acid concentrations in the composites were over 95 wt%. The thermal diffusion coefficients were 3–5 times higher than pure stearic acid, independent of composite densities. Accordingly, the heat storage and release times were decreased by up to 41% and 55%, respectively. After 100 cycles, the composites maintained good dynamic response and long-term cyclic stability, with heat storage density of 122–152 MJ/m3. Hence, this stearic acid/EG phase change composite exhibits excellent comprehensive performances. It is also easy to be prepared and flexible for various types of heat exchangers. View Full-Text
Keywords: stearic acid; inorganic porous matrix; expanded graphite (EG); absorption ability; dynamic response; long-term cyclic stability stearic acid; inorganic porous matrix; expanded graphite (EG); absorption ability; dynamic response; long-term cyclic stability
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Xu, L.; Yang, R. Stearic Acid/Inorganic Porous Matrix Phase Change Composite for Hot Water Systems. Molecules 2019, 24, 1482.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Molecules EISSN 1420-3049 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top