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Phase change materials (PCMs) are new generation energy storage materials that allow the storage of thermal energy as latent heat, allowing the storage or release of large amounts of heat during the phase change from liquid to solid or solid to liquid. PCMs have to be encapsulated on a macro or micro / nano scale to maintain a certain volume during phase change. By means of the encapsulation process, the degree to which the material is affected from external environments is reduced and it is possible to keep the material constant volume during the phase change process of the material from solid to liquid and the heat transfer surface is increased. In this study, n-hexadecane (n-HD), which is a paraffin which is in the class of organic PCMs and which has the potential to be used as heat storage material with the appropriate phase change temperature range in order to provide the thermal comfort of the indoor environment in buildings, is encapsulated in micro-dimension by phase inversion emulsification method. Styrene (St) and cross-linker divinylbenzene (DVB), commonly used for insulation purposes in buildings, were used as the shell in the encapsulation process of n-hexadecane, which is not suitable for direct applications due to leakage problems during phase change process. The thermal properties of the obtained microcapsules were investigated by Differential Scanning Calorimetry (DSC) and Thermogravimetric Analysis (TGA) whereas morphological properties and chemical structure of them were determined by Scanning Electron Microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FT-IR), respectively. The melting enthalpy of the obtained microcapsules was 131,074 J / g, while the PCM content was calculated as 68.55%. The heat storage properties of microencapsulated PCM (MicroPCM) and pure n-hexadecane were comparatively tested in a heated-cooled circulation bath system. The thermal properties obtained in the measurements performed by T-History method are presented in comparison with the results obtained from DSC analysis. It is envisaged that microcapsules containing n-hexadecane phase change material are suitable for use in indoor applications in buildings in terms of particle size range, phase change temperature range, heat storage capacity and thermal performance and they can provide significant gains in terms of energy savings in buildings.

Faz Değiştiren Madde Olarak n-Hekzadekan Esaslı Mikrokapsüllerin Hazırlanması, Karakterizasyonu ve Isıl Performansının T-Kayıt Yöntemiyle Belirlenmesi