PCM Based Encapsulation: Energy Efficient Buildings

PCM Based Encapsulation in Energy Efficient Buildings

Description

This study investigates the effect of PCM-based encapsulation on building thermal performance, comparing heat loads before and after PCM integration within the walls. Since PCMs store and release thermal energy during their phase transitions, embedding PCM capsules into building walls offers a way to regulate indoor temperature and reduce both cooling and heating demand. This project evaluates that energy storage capacity and its resulting impact on peak thermal load reduction.

The simulation models a standard room with defined dimensions, material properties, and internal heat sources. The thermal load is first calculated without any PCM present, under varying external temperature conditions, establishing a baseline. PCM capsules are then embedded within the walls, and their phase transition behavior is analyzed in detail, tracking key parameters such as energy storage capacity and liquid fraction — the latter indicating the PCM's current phase state — over time.

Methodology

This project uses transient heat transfer simulations structured around several key stages. The baseline thermal load is first established using conduction, convection, and radiation heat transfer models without any PCM present. PCM capsules are then introduced into the walls, with their thermophysical properties — including melting point and latent heat — explicitly defined.

The PCM's energy storage behavior is assessed across both its charging (melting) and discharging (solidification) cycles, capturing how effectively it absorbs and later releases heat. Throughout this process, the liquid fraction — the proportion of PCM currently in its liquid phase — is tracked continuously to determine how effectively the material stabilizes indoor temperature as it cycles between phases.

Conclusion

Comparing thermal load before and after PCM integration reveals a clear reduction in peak cooling and heating demand, with the quantified energy storage capacity confirming the PCM's role in shifting thermal load away from peak periods. The liquid fraction analysis further reveals how efficiently the PCM transitions between phases, directly shaping its heat-regulating performance.

Most notably, incorporating PCM capsules into the room's walls reduced the average room temperature by 7.7°C compared to the scenario without PCM — a substantial improvement in thermal regulation. This reduction stems directly from the PCM's ability to absorb and store heat during its phase transitions, smoothing out temperature fluctuations and improving overall thermal comfort within the space. These findings support the broader use of PCM-based building materials as an effective strategy for improving energy efficiency and creating more thermally stable indoor environments.