Abstract
Geothermal energy piles are a quite recent renewable energy technique where geothermal energy in the foundation of a building is used to transport and store geothermal energy. In this paper, a structural–functional integrated cement-based composite, which can be used for energy piles, was developed using expanded graphite and graphite nanoplatelet-based composite phase change materials (CPCMs). Its mechanical properties, thermal-regulatory performance, and heat of hydration were evaluated. Test results showed that the compressive strength of GNP-Paraffin cement-based composites at 28 days was more than 25 MPa. The flexural strength and density of thermal energy storage cement paste composite decreased with increases in the percentage of CPCM in the cement paste. The infrared thermal image analysis results showed superior thermal control capability of cement based materials with CPCMs. Hence, the carbon-based CPCMs are promising thermal energy storage materials and can be used to improve the durability of energy piles.
Highlights
In recent years, the building division of China was one of the principal energy users and accounted for nearly 40% of total fossil energy [1]
phase change material (PCM) have been used in buildings for a long time and are considered as a potential candidate to solve issues related to thermal energy shortage by reducing the mismatch between thermal energy supply and demand in time and space
The SEM micrographs were captured for thermal energy storage cement paste, while the energy dispersive spectrometer (EDS) was used to evaluate composite phase change materials (CPCMs) dispersion in cement paste
Summary
The building division of China was one of the principal energy users and accounted for nearly 40% of total fossil energy [1]. Building energy efficiency has become one of the main research areas [5,6,7]. When PCM are combined with building materials, they increase the thermal energy storage capacity of building elements [8]. In this regard, direct and immersion techniques have been used to combine PCM with porous building materials [9]. The retention capacity of these methods is low and vacuum impregnation method is used to increase the encapsulation efficiency of porous materials [10]. Some researchers have presented excellent reviews on PCMs [9,11,12,13]
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