Dynamic heat transfer and thermal performance evaluation of PCM-doped hybrid hollow plaster panels for buildings

Seunghwan Wi; Sungwoong Yang; Jongki Lee; Seong Jin Chang; Sumin Kim

doi:10.1016/j.jhazmat.2019.03.136

Dynamic heat transfer and thermal performance evaluation of PCM-doped hybrid hollow plaster panels for buildings

J Hazard Mater. 2019 Jul 15:374:428-436. doi: 10.1016/j.jhazmat.2019.03.136. Epub 2019 Apr 1.

Authors

Seunghwan Wi¹, Sungwoong Yang¹, Jongki Lee¹, Seong Jin Chang¹, Sumin Kim²

Affiliations

¹ Department of Architecture & Architectural Engineering, Yonsei University, Seoul, 03722, Republic of Korea.
² Department of Architecture & Architectural Engineering, Yonsei University, Seoul, 03722, Republic of Korea. Electronic address: kimsumin@yonsei.ac.kr.

PMID: 31055143
DOI: 10.1016/j.jhazmat.2019.03.136

Abstract

The thermal performance of hybrid hollow plaster panels (HHPPs) was analyzed using the amount of phase change material (PCM) injection as a variable according to the size of the hollow area. This study focuses on n-octadecane, an organic PCM that is used for storing latent heat during the phase change range and to improve thermal transmittance using exfoliated graphite nanoplatelets (xGnPs), which have a high thermal conductivity. When xGnP is applied to n-octadecane, the thermal conductivity improves by 225%, and it is confirmed that the thermal storage or release of the phase change material is an active reaction. The thermo-physical properties of the xGnP and n-octadecane composites were analyzed using a thermal conductivity analyzer (TCi) and differential scanning calorimetry (DSC). The thermal stability of PCM was analyzed over a long duration of 10,000 thermal cycles. The thermal performance of the PCM/plaster composite panel using the dynamic heat transfer device was determined. The peak temperature through the HHPP significantly reduced by 3.8 ℃ in an internal room, and the time-lag effect was confirmed to be 1.56 h. The results indicate that up to 36.6 J/m² of thermal energy was stored in the 26-Px/O, corresponding to approximately 247% of the available thermal energy of the reference panel.

Keywords: Dynamic heat transfer analysis; Energy storage performance; Hybrid hollow plaster panel; Latent heat; Phase change material.