Abstract
Phase change materials (PCMs) offer great potential as a latent heat energy storage technique to provide energy efficient systems in new and existing residential buildings. Due to their unique characteristic of high storage densities and latent heat properties, PCMs provide opportunities for greater energy storage in many applications for residential buildings. These applications include, but are not limited to, solar water heating, space heating/cooling, and waste heat recovery. This study reviews PCM systems in residential building applications, with a focus on their major disadvantages and concludes with proposals for future development. Several disadvantages of PCM use in the given application have been identified and include; super cooling, low thermal conductivity, phase segregation, fire safety, and cost. The issues caused by super cooling and phase segregation lead to thermal cycling degradation, limiting the useful lifecycle of the material. These issues could limit their potential in building applications, which require systems of a long lifespan. Low thermal conductivities can slow down the rate at which heat is distributed or absorbed from the building, which affect the occupants comfort and as well as the efficiency of the system. Ideas based on the current research on ways to limit these disadvantages are included in the study. This study also identifies that further research is required on novel maintenance ways for the PCM systems after they have been installed.
Highlights
Energy is considered a backbone to human activity; while the global population increasing the demand for energy increases [1] Due to the increase on energy demand globally and the increasing levels of greenhouse gases, researchers are continuously looking for greener alternatives for energy storage and supply [2,3]
The results show that Phase Change Materials (PCMs) could be used to increase occupant comfort in buildings as well as store energy
Microencapsulated systems usually suffer from low heat transfer rates, which is usually caused by the matrix encapsulating the PCM having a low thermal conductivity [17]
Summary
Energy is considered a backbone to human activity; while the global population increasing the demand for energy increases [1] Due to the increase on energy demand globally and the increasing levels of greenhouse gases, researchers are continuously looking for greener alternatives for energy storage and supply [2,3] One such area of research is the Phase Change Materials (PCMs). This is followed by a detailed look at the design stages of PCM systems, along with three current applications for PCMs in residential buildings. The concluding section discusses areas for further research into PCM technology based around gaps in current research for residential applications.
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