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Abstract It is necessary to reduce the environmental load by reducing the energy consumption in the building sector. As one of the preferred methods, phase change materials (PCMs) are considered to be promising to store and discharge thermal energy. Recently, many studies of PCM applications in buildings by simulation tools have been conducted. However, there is not much research on glass curtain wall building (GCW) systems applied to PCM installation compared to conventional wall-based buildings (CWB). The objective of this paper is to investigate the optimization of PCM applied to GCW and to evaluate the building energy performance by EnergyPlus. A building model was selected from ASHRAE Standard 90.1–2013 prototype buildings, and Baltimore, Duluth, and Miami in ASHRAE climate classification was used as the input climate data. In this study, the experiment used Shape-stabilized PCM (SSPCM) with mixing ratio of n -octadecane and n -heptadecane (7:3), selected owing to the energy efficiency in the thermal comfort range based on ISO 13790. Considering PCM application to GCWs and CWBs, it is important to apply the optimized PCM considering the different approaches between GCWs and CWBs. In addition, a PCM melting temperature of 25 °C was the most suitable setting for the retrofit. PCM installation on a wall, a floor, and a ceiling with the same melting temperature was the most effective approach. Highlights • Different approaches of phase change material (PCM) installation according to building type. • Specific consideration of outdoor factors required for PCM installation on glass curtain wall building. • Optimized PCM melting temperatures of 22–24 °C and 25–26 °C depending on the building type. • PCM melting temperature of 25 °C was suitable for installation on glass curtain wall. [ABSTRACT FROM AUTHOR]

The objectives of this study involve evaluation of the thermal behaviors of shape-stabilization phase change material (SSPCM) manufacturing machines and SSPCM radiant floor heating (RFH) systems to determine their effectiveness in reducing building energy consumption. SSPCM manufacturing machine can produce more than 1500 g of SSPCM at a time. The advantages of this form of manufacturing include a 3-step filtered method and a two-step simple process. The mixing ratio for RFH was cement: sand: water at weight ratios of 1: 3: 0.5. Measurement results reveal that the thermal conductivity of SSPCM A_10 and A_20 increased by 107.2% and 115.84%, respectively. In thermal room analysis, A_80 case shows a heat maintenance effect of 42 min compared to A_10. Furthermore, the peak temperature is 0.4 °C higher in A_80. Additionally, more specific analysis reveals that the heat flow data presents a small input quantity of SSPCM stored thermal energy as latent heat storage (LHS). Therefore, the thermal performance of SSPCMs produced by the machine is sufficiently confirmed through experiments applied to RFH. [ABSTRACT FROM AUTHOR]

• 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]

Highlights • Hwangtoh board were developed to storing the thermal energy effectively. • Compressive strength of HLP2.5 was higher about than 110% reference. • Thermal sensibility index of Hwangtoh board was lower 14.8% than reference. • Up to 71.42 J/m2 of energy was stored in the Hwangtoh board. • Strength-protected, high-temperature building materials have been developed. Abstract This experiment aimed to develop an energy efficient and sustainable binder. The specimens were made using Hwangtoh, styrene butadiene latex (SBL), and shape stabilized phase change material (SSPCM) consisting of xGnP and n -octadecane. XRD analysis, mechanical performance analysis, FT-IR analysis, morphological analysis and dynamic heat transfer test were carried out. According to the compressive strength measurement, the addition of SBL increased compressive strength, and the addition of SSPCM decreased compressive strength. According to FT-IR analysis, the peak of n -octadecane and the intrinsic peak of Hwangtoh remained intact, indicating that they were physical bonds. As a result of the thermal performance analysis, as the peak temperature was decreased and the thermal sensitivity was decreased compared to the case where SSPCM was applied. The results of heat storage performance analysis indicated that the energy at the storage was improved and HLP7.5 was the most efficient in terms of energy saving and efficiency. [ABSTRACT FROM AUTHOR]