Abstract
In this research, structural-functional integrated cement-based materials were prepared by employing cement paste and a microencapsulated phase change material (MPCM) manufactured using urea-formaldehyde resin as the shell and paraffin as the core material. The encapsulation ratio of the MPCM could reach up to 91.21 wt%. Thermal energy storage cement pastes (TESCPs) incorporated with different MPCM contents (5%, 10%, 15%, 20% and 25% by weight of cement) were developed, and their thermal and mechanical properties were studied. The results showed that the total energy storage capacity of the hardened cement specimens with MPCM increased by up to 3.9-times compared with that of the control cement paste. The thermal conductivity at different temperature levels (35–36 °C, 55–56 °C and 72–74 °C) decreased with the increase of MPCM content, and the decrease was the highest when the temperature level was 55–56 °C. Moreover, the compressive strength, flexural strength and density of hardened cement paste decreased with the increase in MPCM content linearly. Among the evaluated properties, the compressive strength of TESCPs had a larger and faster degradation with the increase of MPCM content.
Highlights
The building sector is the dominant energy consumer with a 40% share of the overall energy consumption in the world [1,2] and is responsible for one-third of the greenhouse gas emissions around the world [3]
The phase change behavior was determined in terms of phase change temperature and thermal energy storage, while the thermal reliability was determined by continuously monitoring the weight changes of the sample when subjected to repeated heating and cooling cycles at a controlled rate
The Thermal gravimetric and differential thermal analysis (TG-DTA) curves of paraffin and microencapsulated phase change material (MPCM) are shown in Figures 9 and 10, respectively
Summary
The building sector is the dominant energy consumer with a 40% share of the overall energy consumption in the world [1,2] and is responsible for one-third of the greenhouse gas emissions around the world [3]. In recent years, the energy demand for buildings has increased very rapidly due to population growth, enhancement of building services and thermal comfort levels, as well as the increase in the time that people spend inside buildings [4]. It is predicted that fossil fuels will continue to produce 75%–80% of the world’s primary energy by 2030 [5]. The increase in energy demand, the shortage of fossil fuels and environmental concerns have provided the impetus for the development of sustainable building and renewable energy resources. One of the technologies is the thermal energy storage method, which has been considered a simple and effective technique to enhance the energy efficiency of buildings. This, in turn, reduces the environmental impact related to energy use [6]
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