На английском языке. Магистерская диссертация. Работа выполнена в
Concordia University (Canada), 1983, 186 + XIX pp.
ABSTRACT
An analysis of thermal properties of fatty acids and their binary mixtures has shown that they are attractive candidates for latent heat thermal storage in space heating applications. In this study, the method of differential scanning calorimetry was used to determine the melting point, freezing point, heat of meltinq and heat of crystallization of the fatty acids .ind-their binary mixtures. These properties are of prime importance in the desiqn of a latent heat thermal storage system. The melting-range of tfte fatty acids (capric, lauric, palmitic and stearic) was observed to be from approximately 30°C to 65°C. The heat of transition of these acids (melting and crystallization) was observed to have a range from approximately 153J/g to 183J/g. The eutectic points were determined for the binary mixtures of the fatty acids. The melting points of the eutectics for the binary systems, of capric-lauric, lauric-palmitic , lauric-stearic and palmitic-stearic acids were observed to be 18.2°C, 32.7°C, 34°C and 51.1°C espectively. The corresponding heats of melting were found to be 120J/g, 147J/g, 152J/g and 15.9J/g respectively. The fatty acids and their eutectic mixtures were examined with an X-ray diffractometer and an infrared spectrophotometer to ascertain the pojymorphic forms, crystal structures and material purities. The experimental results indicate that the fatty acids are present in the C-polymorphic form.
ABSTRACT
An analysis of thermal properties of fatty acids and their binary mixtures has shown that they are attractive candidates for latent heat thermal storage in space heating applications. In this study, the method of differential scanning calorimetry was used to determine the melting point, freezing point, heat of meltinq and heat of crystallization of the fatty acids .ind-their binary mixtures. These properties are of prime importance in the desiqn of a latent heat thermal storage system. The melting-range of tfte fatty acids (capric, lauric, palmitic and stearic) was observed to be from approximately 30°C to 65°C. The heat of transition of these acids (melting and crystallization) was observed to have a range from approximately 153J/g to 183J/g. The eutectic points were determined for the binary mixtures of the fatty acids. The melting points of the eutectics for the binary systems, of capric-lauric, lauric-palmitic , lauric-stearic and palmitic-stearic acids were observed to be 18.2°C, 32.7°C, 34°C and 51.1°C espectively. The corresponding heats of melting were found to be 120J/g, 147J/g, 152J/g and 15.9J/g respectively. The fatty acids and their eutectic mixtures were examined with an X-ray diffractometer and an infrared spectrophotometer to ascertain the pojymorphic forms, crystal structures and material purities. The experimental results indicate that the fatty acids are present in the C-polymorphic form.