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Heat exchanger using structured material
Simon, Jakub ; Čížek, Petr (referee) ; Vaverka, Ondřej (advisor)
The aim of this work was to develop and describe a design method of a heat exchanger using Triply Periodic Minimal Surfaces (TPMS) structures and to validate it by design, fabrication, and experimental testing of a working sample. It is an oil-water cooler fabricated additively by Laser Powder Bed Fusion on an SLM 280 HL machine from AlSi10Mg material. After a series of analyses and tests, a cubic diamond structure with a minimum wall thickness of 0.7 mm and a range of relative densities of 15 to 25 % (cell edge length 11.1÷18.5 mm) was chosen for the developed method. The method also includes a prediction script of the performance of the proposed heat exchanger, which was created from data measured during testing of samples with different cells configurations. The method itself guides the user step-by-step from the selection of input requirements, through the estimation of performance, to the two-step parametric modelling of the TPMS exchanger itself (explicit and implicit). The functional sample created using this method achieved heat flows of 315,25 W, which is 4.2 % higher than the reference plate exchanger. The TPMS exchanger also has a 78 % smaller heat transfer body and 62 % less total mass. The differences between predicted and actual heat flows were up to 18%. In its current state, the method is suitable for the design of TPMS heat exchangers with heat flow of 50 to 230 W. However, it is generally versatile and can also be used to map other areas, thus making it more accurate.
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Design and analysis of split-phase induction motor
Nekovář, Martin ; Hájek, Vítězslav (referee) ; Vítek, Ondřej (advisor)
The bachelor‘s thesis deals with the construction, operation principle, design method and analysis of the magnetic circuit of single-phase induction motor with auxiliary phase. The auxiliary phase is considered as winding with series connected electrolytic capacitor. In the first charter is written a general view of single-phase motors. Furthermore, in the following section discussed the design of these machines. Principle of operation as the next section contains an explanation of torque using the theory of two magnetic fields acting against each other. The design method of single phase motor is described the procedure for calculating. Subsequently, two proposals of single-phase induction motor with auxiliary winding were developed according to the method of design and an analysis of their magnetic circuits using the finite element method was made.
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Design and analysis of split-phase induction motor
Nekovář, Martin ; Hájek, Vítězslav (referee) ; Vítek, Ondřej (advisor)
The bachelor‘s thesis deals with the construction, operation principle, design method and analysis of the magnetic circuit of single-phase induction motor with auxiliary phase. The auxiliary phase is considered as winding with series connected electrolytic capacitor. In the first charter is written a general view of single-phase motors. Furthermore, in the following section discussed the design of these machines. Principle of operation as the next section contains an explanation of torque using the theory of two magnetic fields acting against each other. The design method of single phase motor is described the procedure for calculating. Subsequently, two proposals of single-phase induction motor with auxiliary winding were developed according to the method of design and an analysis of their magnetic circuits using the finite element method was made.
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