Abstract
Phase change materials (PCMs) have been used in various fields including the materials of buildings. In this research, mixed shape-stabilized PCMs (Mixed SSPCMs) were prepared by impregnating coconut oil and n-hexadecane into exfoliated graphite nanoplatelets (xGnP) through a vacuum impregnate method. Coconut oil is fatty acid ester PCM which is relatively economical in comparison to other PCMs, and n-hexadecane is paraffin PCM that has high latent heat capacity. Drawbacks include leakage in a liquid state and low thermal conductivity resolved by xGnP. When preparing Mixed SSPCMs, coconut oil and n-hexadecane were impregnated at different proportions, namely 70:30, 50:50, 30:70 wt %. Mixed SSPCMs were analyzed through SEM, FT-IR, DSC, TGA and TCi. As a result, we confirmed the microstructure, chemical stability, thermal properties, thermal stability and thermal conductivity of Mixed SSPCMs. Latent heat capacity of Mixed SSPCMs were 89.06, 104.30 and 124.50 J/g while those of SSPCMs containing single PCM were 82.34 and 96.40 J/g. Thermal conductivity of Mixed SSPCMs was more than 284% higher than that of pure coconut oil and n-hexadecane. Finally, we confirmed that coconut oil and n-hexadecane were impregnated into xGnP, and the Mixed SSPCMs have high thermal durability.
Highlights
Thermal energy storage (TES) for space heating and cooling of buildings is becoming more and more important due to the rising cost of fossil fuels and environmental concerns
We confirmed that coconut oil and n-hexadecane were impregnated into xGnP, and the Mixed shape-stabilized PCM (SSPCM) have high thermal durability
The·coconut oil + n-hexadecane Mixed SSPCMs in the colloidal state were filtered through 1 μm filter paper until a granule type of sample appeared on the filter paper, and those were dried in a vacuum drier at 80 ̋ C for 48 h
Summary
Thermal energy storage (TES) for space heating and cooling of buildings is becoming more and more important due to the rising cost of fossil fuels and environmental concerns. An effective way to reduce the building’s energy consumption for heating and cooling is by incorporating phase change materials (PCMs) in latent heat thermal energy storage (LHTES) systems of various building elements such as walls, windows, ceilings and floors [3,4]. Paraffin PCMs are more widely used for application in building because they possess large latent heat capacity, low vapor pressure, and good thermal stability [8,9]. Fatty acid ester and paraffin PCMs have low thermal conductivity and leakage of liquid problems that disturb their application to energy storage [11,12,13]. We used a vacuum impregnation process that guarantees high heat storage of fatty acid ester PCM and paraffinic PCM due to capillary forces and surface tension forces during the incorporation process [23]. Mixed SSPCMs by using SEM, FT-IR, DSC, TGA, and TCi
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