Thermal energy storage and thermodynamic properties of (E)-3-m-tolylbut-2-enoic acid as a medium temperature phase change material. Issue 6 (3rd May 2019)

• Record Type: Journal Article
• Authors: Zeng, Ju-Lan; Zhang, Yu-Xiang; Xie, Ting; Shu, Li; Jiang, Liu-Mo; Li, Kun-Yu; Wang, Shao-Fen; Sun, Li-Xian
• Is Part Of: International journal of green energy. Volume 16:Issue 6(2019)
• Page Start: 468
• Page End: 475
• Publication Date: 2019-05-03
• Subjects: Phase change materials -- thermal energy storage -- solar absorption cooling -- thermodynamic properties -- (E)-3-m-tolylbut-2-enoic acid; Power resources -- Research -- Periodicals; Energy industries -- Periodicals; Energy development -- Periodicals; 333.79
• DOI: 10.1080/15435075.2019.1580197
• Languages: English
• ISSNs: 1543-5075

Abstract

ABSTRACT: Phase change materials (PCMs) that can store and release heat energy over the temperature range from 363 to 393 K are crucial for solar absorption cooling, and it is worthy to seek new solid-liquid PCMs candidates that melt and crystallize in this temperature range. In this paper, ( E )-3-m-tolylbut-2-enoic acid (mTBEA) was applied as a PCM candidate. Its thermal energy storage properties and thermal stability were systematically investigated. The results showed that mTBEA melted at 382.9 ± 0.5 K and crystallized at about 364 K, with a melting enthalpy (Δfus H ) of 138.4 ± 6.9 J g −1 and showed good long-term cyclic stability and thermal stability. The supercooling of mTBEA was stabilized at about 20 K, indicating that the conservation condition of melted mTBEA could be simple. In addition, the melted mTBEA could release all the absorbed thermal energy upon crystallizing. Besides, mTBEA exhibited good thermal stability for it to be applied as PCM. Hence, mTBEA is a promising PCM candidate for solar absorption cooling. Furthermore, the heat capacity of mTBEA was measured by modulated temperature differential scanning calorimetry (MTDSC) over the temperature range from 198.15 to 431.15 K, and the molar thermodynamic functions, [ HT -H 298.15 ]m and [ ST -S 298.15 ]m, were calculated based on the fitted molar heat capacity data.