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

• A novel HHPPs with excellent thermal energy storage capacity were developed. • The thermal stability of PCM over a long period of analyzed through after 10,000 times thermal cycling. • The peak temperature through the HHPPs was significantly reduced of 3.8 ℃ at internal room. • Time-lag effect in the phase change transition of HHPPs occurred for up to 1.56 h. • Up to 36.6 J/m2 of thermal energy was stored in the 26-Px/O-HHPP. 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. [ABSTRACT FROM AUTHOR]