The manufacturing of a structure’s exterior walls and top covering seldom uses phase change materials (PCMs). Thus, demonstrating an unsuccessful approach towards enhancing the energy efficiency of said building. The extensive examination that has been carried out over the past two decades has revealed the potential abilities of PCMs in terms of energy preservation in building envelopes. However, the significant fiscal burden associated with PCMs’ use has prevented their widespread adoption. This scholarly article provides a thorough assessment of a unique PCM that incorporates naturally occurring fatty acids and glycerides into flyash pellets, while also assessing its performance in relation to applications involving building envelopes. To attain an intended result, the PCM-flyash pellets were combined with nanoclay ceramic insulation. sprayed to a test building outside wall and observed over several months in a hot, humid environment. In order to demonstrate how well the PCM-flyash-enhanced nanoclay insulation reduces heat gains and losses in the building envelope, A comparison was done using a section of wall that was entirely insulated with nanoclay ceramic material. To further comprehend how the PCM-flyash pellets influenced the wall heating as well, the test wall’s numerical modelling was conducted. Experimental data were used to test the concept initially. Then the experimental data was compared with the computational analysis presented in this study, which thereby demonstrated the new PCM incorporated flyash nanoclay material potential for energy-saving in building envelops.

Keywords: Nanoceramic, Fly ash, Building envelope, Energy efficiency, Phase change material.