New generation phase change material production and investigation of thermal properties

In recent years, countries have tended to change their energy policies and seek different sources in order to meet the energy demand resulting from the increasing world population and the uncontrolled use of fossil fuels. In addition to the effective and efficient use of energy resources, it is also very important to store energy in appropriate conditions. FDMs are materials that provide efficient storage of heat. The working principles of FDMs are that they can store quite a lot of energy in the melting and freezing temperature ranges. For this reason, they are used quite frequently in recent studies in the field of energy. The most important problem brought by the photovoltaic systems that enable the use of solar energy as electrical energy, which is in the first place of renewable energy sources, is that the usage areas are very limited and their lifespan is shortened at high temperatures. FDMs' high energy storage features bring their use for cooling in different systems. In recent years, FDMs have been used frequently in the cooling of photovoltaic systems. However, literature studies are mostly limited to the use of macroencapsulated FDMs in photovoltaic systems. For this purpose, in the thesis study, Decanoic Acid, n-Octanoic Acid and Docosane were microencapsulated with the interfacial polymerization method and their thermal properties and potential use in photovoltaic systems were examined. In the second step of the study; Ideal eutectic mixtures were obtained from the mixtures of Docosan-Decanoic Acid [1/4], Docosan-n-Octanoic Acid [1:4] and Decanoic acid-n-Octanoic Acid [3\2], and these suitable eutectic FDMs were encapsulated by interfacial polymerization. Structural and thermal properties of microencapsulated FDMs were analyzed using FT-IR, SEM and DSC techniques. When the DSC analyzes were examined, it was determined that among the pure microencapsulated FDMs, the microencapsulated Docosane and among the eutectic microencapsulated FDM, the docosan-n-octanoic acid eutectic mixture had the highest melting and freezing latent heat values.