|
|
Optimalisation of thermal properties of solar cell modules
Dohnalová, Lenka ; Matiašovský, Peter (referee) ; Zmeškal, Oldřich (advisor)
The topic of presented diploma thesis is study of thermal properties structures of photovoltaic cells. The main goal of this thesis is study of ways of heat spreading from volume and planar materials (conduction, convection and radiation). Then it is needed to determine contributions of heat spread from laminated photovoltaic cell and compare them to results measured by transient pulse method, step wise method and with thermo-camera using. At the beginning of this thesis it will be needed to define heat and ways it’s spread. Heat is closely connected with temperature. That is reason why will be there spoken about temperature and methods of its measuring. Than there will be defined basic thermo-physical parameters of materials. Thermo-physical parameters of materials will be measured by transient methods that will be characterized later and by thermo-camera. This thesis deals with photovoltaic cells, so there will be described their structure, properties, utilization and way of their production. Subsequently after the definition of all needed terms the experimental part of this thesis will be introduced. It will be needed to characterize measured volume material and define its thermo-physical parameters. Using the pulse transient method, step wise method and thermo-camera there will be measured the thermal response of PMMA sample, nonlaminated photovoltaic cell and also samples of laminated photovoltaic cells. Findings of all described methods will be finally compared.
|
|
|
Study of thermal properties of materials for solar cells lamination
Dohnalová, Lenka ; Matiašovský, Peter (referee) ; Zmeškal, Oldřich (advisor)
The topic of presented bachelor´s thesis was study of thermal properties of materials for solar cells lamination. The main goal of this thesis was measuring and characterisation of the basic thermal properties of volume materials and plastic films, which are used to solar cells lamination. At first a thermal response to a concrete thermal pulse was measured by the thermoelectric thermometer. Then there was studied the distribution of temperature on the surface of a sample during heating and cooling by the non-point heat source. At the beggining of this thesis it was needed to define heat and ways it´s spread, then the basic thermal properties and also methods of their determination. The ways of measuring temperature were described and then used in praxis. My thesis deals with study of thermal properties volume materials. It was needed to characterize measured volume material and define it´s thermal parameters, because the values of thermal parameters of measured samples of lamination films were compared to these values. This thesis is concerned in solar cells too. So there were also described their structure, properties, utilization and way of their production. After the definition of all needed therms the experimental part of this thesis was begun. At first the thermal response of each of the eight different samples was measured by the pulse transient method. Then there was studied the thermal field on the surface of the sample by thermocamera through using the pulse transient method. Findings of both methods were finally compared.
|
|
|
Study of Thermal Properties of Materials for Cooling of Photovoltaic Panels
Dohnalová, Lenka ; Pavlík, Zbyšek (referee) ; Matiašovský, Peter (referee) ; Zmeškal, Oldřich (advisor)
The topic of this doctoral thesis is to study the thermal properties of PCM materials and discussion of their use for cooling of photovoltaic systems. The aim of the study is to measure and characterize the thermal properties of commercial PCM materials (Micronal®), their practical use is related to the phase transitions. The behavior of bulk materials at different temperatures is well described theoretically and experimentally verified. For the application use it is necessary to examine and determine the thermal properties of PCM materials depending on the phase transitions during heating and cooling. To study the thermal properties of materials the known transient methods of measuring are used which give full information about the behavior of the materials investigated in dependence on the temperature and thus allow the determination of the thermo-physical parameters of the system. For the transient measurements there are used especially pulse transient and step wise method. Newly is used also combination of linear temperature rise (the ramp wise) and the step wise method. The principle is based on the generation of a small amount of heat inside the studied sample and it is measured the thermal response of the system from which it may be then determined the necessary thermo-physical parameters. The theoretical part of this thesis focuses on characterization of methods for the determination of thermo-physical parameters of the investigated material. In the experimental part of the approached process of experiment, the results, the method of evaluation of the obtained data and also the discussion of results from the viewpoint of potential applications are presented.
|
|
|
Surgical sex conversion
Dohnalová, Lenka ; Šamánková, Marie (advisor) ; Kříž, Jan (referee)
The aim of this thesis is to concentrate to inform the comunity with less known problems of nursing the patients with disorders of sexual identification - with transexuality. The persons with this disorder have genetic and somatic equipment belong to one sex, however their sexual identification is orientated to contrary gender. Surgical conversion of sex of transexuals forms oni y one of the aspects by complex approach to this complicated disorder. The decision when the surgery is indicated is up to sexologist and authorized by the committee. The commision decision is based on detailed and prolonged psychological approach to everyone. The observation is pointed at adaptation for new social status a:fter longtime hormonal treatment and follows a:fter operation and o:fficial conversion ofthe gender as well. Powered by TCPDF (www.tcpdf.org)
|
|
|
Surgical sex conversion
Dohnalová, Lenka ; Šamánková, Marie (advisor) ; Kříž, Jan (referee)
The aim of this thesis is to concentrate to inform the comunity with less known problems of nursing the patients with disorders of sexual identification - with transexuality. The persons with this disorder have genetic and somatic equipment belong to one sex, however their sexual identification is orientated to contrary gender. Surgical conversion of sex of transexuals forms oni y one of the aspects by complex approach to this complicated disorder. The decision when the surgery is indicated is up to sexologist and authorized by the committee. The commision decision is based on detailed and prolonged psychological approach to everyone. The observation is pointed at adaptation for new social status a:fter longtime hormonal treatment and follows a:fter operation and o:fficial conversion ofthe gender as well. Powered by TCPDF (www.tcpdf.org)
|
|
|
Study of Thermal Properties of Materials for Cooling of Photovoltaic Panels
Dohnalová, Lenka ; Pavlík, Zbyšek (referee) ; Matiašovský, Peter (referee) ; Zmeškal, Oldřich (advisor)
The topic of this doctoral thesis is to study the thermal properties of PCM materials and discussion of their use for cooling of photovoltaic systems. The aim of the study is to measure and characterize the thermal properties of commercial PCM materials (Micronal®), their practical use is related to the phase transitions. The behavior of bulk materials at different temperatures is well described theoretically and experimentally verified. For the application use it is necessary to examine and determine the thermal properties of PCM materials depending on the phase transitions during heating and cooling. To study the thermal properties of materials the known transient methods of measuring are used which give full information about the behavior of the materials investigated in dependence on the temperature and thus allow the determination of the thermo-physical parameters of the system. For the transient measurements there are used especially pulse transient and step wise method. Newly is used also combination of linear temperature rise (the ramp wise) and the step wise method. The principle is based on the generation of a small amount of heat inside the studied sample and it is measured the thermal response of the system from which it may be then determined the necessary thermo-physical parameters. The theoretical part of this thesis focuses on characterization of methods for the determination of thermo-physical parameters of the investigated material. In the experimental part of the approached process of experiment, the results, the method of evaluation of the obtained data and also the discussion of results from the viewpoint of potential applications are presented.
|
|
|
Optimalisation of thermal properties of solar cell modules
Dohnalová, Lenka ; Matiašovský, Peter (referee) ; Zmeškal, Oldřich (advisor)
The topic of presented diploma thesis is study of thermal properties structures of photovoltaic cells. The main goal of this thesis is study of ways of heat spreading from volume and planar materials (conduction, convection and radiation). Then it is needed to determine contributions of heat spread from laminated photovoltaic cell and compare them to results measured by transient pulse method, step wise method and with thermo-camera using. At the beginning of this thesis it will be needed to define heat and ways it’s spread. Heat is closely connected with temperature. That is reason why will be there spoken about temperature and methods of its measuring. Than there will be defined basic thermo-physical parameters of materials. Thermo-physical parameters of materials will be measured by transient methods that will be characterized later and by thermo-camera. This thesis deals with photovoltaic cells, so there will be described their structure, properties, utilization and way of their production. Subsequently after the definition of all needed terms the experimental part of this thesis will be introduced. It will be needed to characterize measured volume material and define its thermo-physical parameters. Using the pulse transient method, step wise method and thermo-camera there will be measured the thermal response of PMMA sample, nonlaminated photovoltaic cell and also samples of laminated photovoltaic cells. Findings of all described methods will be finally compared.
|
|
|
Study of thermal properties of materials for solar cells lamination
Dohnalová, Lenka ; Matiašovský, Peter (referee) ; Zmeškal, Oldřich (advisor)
The topic of presented bachelor´s thesis was study of thermal properties of materials for solar cells lamination. The main goal of this thesis was measuring and characterisation of the basic thermal properties of volume materials and plastic films, which are used to solar cells lamination. At first a thermal response to a concrete thermal pulse was measured by the thermoelectric thermometer. Then there was studied the distribution of temperature on the surface of a sample during heating and cooling by the non-point heat source. At the beggining of this thesis it was needed to define heat and ways it´s spread, then the basic thermal properties and also methods of their determination. The ways of measuring temperature were described and then used in praxis. My thesis deals with study of thermal properties volume materials. It was needed to characterize measured volume material and define it´s thermal parameters, because the values of thermal parameters of measured samples of lamination films were compared to these values. This thesis is concerned in solar cells too. So there were also described their structure, properties, utilization and way of their production. After the definition of all needed therms the experimental part of this thesis was begun. At first the thermal response of each of the eight different samples was measured by the pulse transient method. Then there was studied the thermal field on the surface of the sample by thermocamera through using the pulse transient method. Findings of both methods were finally compared.
|
|
| |
guest ::
RSS feed.