Özet:

In this study, cooling loads were investigated numerically with ANSYS Fluent program by using phase change material (PCM) instead of traditional thermal insulation material on the exterior walls of buildings facing different directions. Analyzes were carried out in two dimensions and depending on time. Considering the summer climatic conditions of the Elazığ province, it is assumed that the building's outer surface of the building is exposed to changing solar radiation and outdoor temperatures for 24 hours, and the inner surface is in contact with the room air at a constant temperature. For this purpose, five different wall models were considered and firstly, the temperature distributions and cooling loads were calculated along the wall thickness, and then the time lag and decrement factor represented the thermal storage capacities were determined. The results obtained were compared with the existing insulation. As a result, by applying PCM of the same thickness to the wall instead of insulation, external temperature fluctuations for all wall orientations are reduced and its spread to the interior surface is minimized. In addition, it was observed that the heat storage capacity of the wall increased from the point of view of maximum time lag and minimum decrement factor by applying PCM to the wall. It has been seen that the use of phase change material on the outside is more efficient and 2oC lower temperature is obtained on the inner surface compared to the non-insulated wall. Owing to the UDF (User-defined function) code used in the study, the temperature values in each hour are given as variable boundary conditions.

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