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Method for the solution of conduction heat transfer in Phase change material with nanoparticles
Kopečková, Barbora ; Knotek, Stanislav (referee) ; Jícha, Miroslav (advisor)
This master thesis deals with problematic of the heat convection in phase change materials (PCM) and PCM with nanoparticles. The derivation of stationary and non-stationary equations for 1D, 2D and 3D heat convection are described in detail. The finite element volume method is used for solution to these equations, of which principle is described carefully. The aim of this thesis is model development for 2D solution to temperature distribution at heat convection in PCM and influence assessment of nanoparticle implementation into material on given temperature distribution. Software MATLAB was used for model development, solution and plotting graphs.
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Integration of phase change materials in building structures
Klubal, Tomáš ; Šťastník, Stanislav (referee) ; Solař,, Jaroslav (referee) ; Ostrý, Milan (advisor)
The thesis deals with the integration of phase change materials (PCMs) into building structures. The basic requirement is improved thermal stability during the summer season without using an air conditioner. This can be achieved by increasing the thermal storage capacity of the building structures. If the thermal capacity cannot be increased on the level of weight, phase change materials can be used. These materials are capable of storing latent heat and thus increasing the thermal storage capacity of the building. In the thesis the phase change materials were investigated in a thermal incubator by thermal analysis and, above all, in full-scale experiments using comparative measurements. The comparative measurements were carried out in two attic rooms at the Faculty of Civil Engineering, Brno University of Technology, where in one was used as a reference and the other for the experiment. Manufactured heat storage panels were installed in the experimental room. These panels are composed of a base plate; the capillary tubes placed on it are coated with modified plaster. The gypsum plaster is modified with micro-capsules paraffin for improving the thermal storage capacity. This system is connected to a thermal air-water pump, by which the storage panels can be additionally cooled or heated. In the experimental measurements, different operating modes were investigated and their effect on the indoor environment was evaluated. Thermal storage in PCMs dampens the temperature amplitude in the building during the summer season and, at the same time, allows the stored heat to be discharged during the night. Moreover, the time interval of withdrawing electric energy from the supply mains is much shorter than in the case of air conditioning. A conventional air conditioner must operate simultaneously with the thermal load, i.e. at the time of peak consumption of electric energy. Thanks to the set regimes, the installed system is capable of responding to external thermal condit
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New external thermal insulation composite system taking in to account the sustainable use of natural resources
Sokola, Lubomír ; Rovnaníková, Pavla (referee) ; Vejmelková,, Eva (referee) ; Nosek,, Karel (referee) ; Žižková, Nikol (advisor)
The work is focused on the development of an environmentally friendly external thermal insulation composite system in terms of product composition and composition of the whole system. The intention is to develop an alternative to standard external thermal insulation composite systems. Undoubtely, standard systems have a contribution to energy savings (primary role), but their actual production and composition is also a burden on the environment. The research is focused onthe development of adhesive and leveling substance and plaster using progressive material with phase transformation and energy by-product (fly ash). Furthermore, it is focused on the selection of insulation from renewable sources. Therefore, there is paid attention to the overall composition of the thermal insulation system in order to achieve the most effective impact with respect to the environment. The goal is to achieve secondary energy and resource savings due to the composition of components and also the composition of the entire system.
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New external thermal insulation composite system taking in to account the sustainable use of natural resources
Sokola, Lubomír ; Rovnaníková, Pavla (referee) ; Vejmelková,, Eva (referee) ; Nosek,, Karel (referee) ; Žižková, Nikol (advisor)
The work is focused on the development of an environmentally friendly external thermal insulation composite system in terms of product composition and composition of the whole system. The intention is to develop an alternative to standard external thermal insulation composite systems. Undoubtely, standard systems have a contribution to energy savings (primary role), but their actual production and composition is also a burden on the environment. The research is focused onthe development of adhesive and leveling substance and plaster using progressive material with phase transformation and energy by-product (fly ash). Furthermore, it is focused on the selection of insulation from renewable sources. Therefore, there is paid attention to the overall composition of the thermal insulation system in order to achieve the most effective impact with respect to the environment. The goal is to achieve secondary energy and resource savings due to the composition of components and also the composition of the entire system.
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Integration of phase change materials in building structures
Klubal, Tomáš ; Šťastník, Stanislav (referee) ; Solař,, Jaroslav (referee) ; Ostrý, Milan (advisor)
The thesis deals with the integration of phase change materials (PCMs) into building structures. The basic requirement is improved thermal stability during the summer season without using an air conditioner. This can be achieved by increasing the thermal storage capacity of the building structures. If the thermal capacity cannot be increased on the level of weight, phase change materials can be used. These materials are capable of storing latent heat and thus increasing the thermal storage capacity of the building. In the thesis the phase change materials were investigated in a thermal incubator by thermal analysis and, above all, in full-scale experiments using comparative measurements. The comparative measurements were carried out in two attic rooms at the Faculty of Civil Engineering, Brno University of Technology, where in one was used as a reference and the other for the experiment. Manufactured heat storage panels were installed in the experimental room. These panels are composed of a base plate; the capillary tubes placed on it are coated with modified plaster. The gypsum plaster is modified with micro-capsules paraffin for improving the thermal storage capacity. This system is connected to a thermal air-water pump, by which the storage panels can be additionally cooled or heated. In the experimental measurements, different operating modes were investigated and their effect on the indoor environment was evaluated. Thermal storage in PCMs dampens the temperature amplitude in the building during the summer season and, at the same time, allows the stored heat to be discharged during the night. Moreover, the time interval of withdrawing electric energy from the supply mains is much shorter than in the case of air conditioning. A conventional air conditioner must operate simultaneously with the thermal load, i.e. at the time of peak consumption of electric energy. Thanks to the set regimes, the installed system is capable of responding to external thermal condit
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Method for the solution of conduction heat transfer in Phase change material with nanoparticles
Kopečková, Barbora ; Knotek, Stanislav (referee) ; Jícha, Miroslav (advisor)
This master thesis deals with problematic of the heat convection in phase change materials (PCM) and PCM with nanoparticles. The derivation of stationary and non-stationary equations for 1D, 2D and 3D heat convection are described in detail. The finite element volume method is used for solution to these equations, of which principle is described carefully. The aim of this thesis is model development for 2D solution to temperature distribution at heat convection in PCM and influence assessment of nanoparticle implementation into material on given temperature distribution. Software MATLAB was used for model development, solution and plotting graphs.
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