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Investigation of nanomaterials for their nuclear power and research utilization
Jelínek, Martin ; ČEZ,, Jiří Skalička, (referee) ; Katovský, Karel (advisor)
This bachelor thesis provides a comprehensive overview of the properties of various nanomaterials and summarizes the latest findings and knowledge of advanced applications in all sectors of nuclear power engineering from construction materials through nuclear fuel, fuel cladding, neutron moderator and coolant to the advanced methods for detection of ionizing radiation ad its direct utilization for electricity production. A significant space is devoted to the applications in safety systems of nuclear power plants. The experimental part of the thesis deals with the possibility of using carbon nanofibers as an additive to the coolant in VVER reactor type in order to improve the thermal properties of the coolant. So far a very little examined issues of neutron balance changes due to interaction with nanoparticles was experimentally verified on the paraffin wax mixture of two different concentrations. The comparison with the reference sample of pure paraffin was also made.
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Study of energy accumulation during phase change of paraffin wax
Lapčíková, Tereza ; Krouská, Jitka (referee) ; Zmeškal, Oldřich (advisor)
This thesis deals with the study of the process of energy storage during phase transformation, the so-called latent heat for commercial materials of the Rubitherm® RT line (Rubitherm Technologies GmbH) with applications in the construction industry. The thermophysical properties of Rubitherm® RT35HC, RT28HC and RT18HC materials differing in phase transformation temperature were investigated using the transient method. For the Rubitherm® RT35HC material a value of the thermal conductivity coefficient in the solid phase of 0.21 W/m/K and in the liquid phase of 0.23 W/m/K was determined. The specific heat capacity value in the solid phase was determined to be 1980 J/kg/K and in the liquid phase 1995 J/kg/K. For Rubitherm® RT28HC, the value of the thermal conductivity coefficient in the solid phase was determined to be 0,23 W/m/K and the value of the specific heat capacity in the solid phase was determined to be 1997 J/kg/K. For the Rubitherm® RT18HC material, a liquid phase thermal conductivity coefficient of 0,27 W/m/K and a liquid phase specific heat capacity of 2010 J/kg/K were determined. Using differential scanning calorimetry (DSC), the melting temperature of the Rubitherm® RT28HC sample was determined at 27.43 °C and solidification at 23.51 °C, while for the Rubitherm® RT35HC sample melting occurred at 36.51 °C and solidification at 31.86 °C and 32.28 °C. In the experimental part of this work, modifications were made to the measuring apparatus used in such a way that it could be used for the study of materials that change their state of matter during the experiment.
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Investigation of nanomaterials for their nuclear power and research utilization
Jelínek, Martin ; ČEZ,, Jiří Skalička, (referee) ; Katovský, Karel (advisor)
This bachelor thesis provides a comprehensive overview of the properties of various nanomaterials and summarizes the latest findings and knowledge of advanced applications in all sectors of nuclear power engineering from construction materials through nuclear fuel, fuel cladding, neutron moderator and coolant to the advanced methods for detection of ionizing radiation ad its direct utilization for electricity production. A significant space is devoted to the applications in safety systems of nuclear power plants. The experimental part of the thesis deals with the possibility of using carbon nanofibers as an additive to the coolant in VVER reactor type in order to improve the thermal properties of the coolant. So far a very little examined issues of neutron balance changes due to interaction with nanoparticles was experimentally verified on the paraffin wax mixture of two different concentrations. The comparison with the reference sample of pure paraffin was also made.
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