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Dynamic model of a heat pump with plate heat exchangers and ecological refrigerant
Strmiska, Pavel ; Řehák Kopečková, Barbora (referee) ; Pokorný, Jan (advisor)
For the optimization of a heat pump, there is a need to possess its dynamic model. One of the freely available tools for creating such a model is the language Modelica and its open-source compiler OpenModelica. The thesis aims to research options for creating dynamic models of refrigeration circuits with the ecological refrigerant R290 and its components in Modelica, to create the circuit and subsequently validate it using previously measured data. Models of basic components of heat pumps - compressor, condenser, evaporator and expansion valve are created in a way described in the thesis. A simplified model of a refrigerant loop is also created
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Validity of commercially available smartwatches when estimating energy expenditure
Kopecký, David ; Pokorný, Jan (referee) ; Řehák Kopečková, Barbora (advisor)
Metabolic rate is an energy quantity. Its value is a key input not only in thermophysiological models, but also in the calculation of heat stress indices or complex models predicting a person's thermal sensation. With the dynamic development of technology, sporttesters are able to estimate energy expenditure, among other things. It is a non-invasive method of estimating energy expenditure, or metabolic rate, using associated body functions to predict it. This work deals with the validity of the accuracy of metabolic rate estimation using the Garmin Fenix 6X Pro sporttester in comparison with indirect calorimetry. The accuracy of the metabolic rate estimation was tested for the activities of lying down, administrative work and cycling with regulated mechanical resistance of 100 and 150 W. 15 male subjects aged 28 ± 5 years, with a weight of 83.2 ± 13.5 kg and a height of 180 ± 7 cm participated in the study. In terms of the results, it is possible to observe a lower accuracy of prediction of metabolic rate for low-intensity activities, with the resulting MAPE being around 19-43 %. On the other hand, for activities with moderate activity, the prediction of the metabolic rate by the used sporttester proved to be sufficiently accurate, with a resulting MAPE in the range of 6–8 %.
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Design of universal hydraulic power unit
Holub, Vojtěch ; Pokorný, Jan (referee) ; Knoflíček, Radek (advisor)
The first part of this masters thesis deals with research of modulat type hydraulics power units from other significant world producers. Design part of thesis contains complete design of three product ranges of hydraulics power units. It also includes simulation by FEM method. Last part descibe safety of machine and brief economic evaluation of product.
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Database of typical clothing for cabin of cars
Toma, Róbert ; Pokorný, Jan (referee) ; Fišer, Jan (advisor)
In this bachelor thesis, there are processed databases of typical clothing for cabin of cars. Data are based on information from survey for both women and men for three seasons – summer, transitional season and winter. There are mentioned factors which affect thermal comfort and thermoregulation of human body. The thesis includes options how to measure thermal comfort and how we can evaluate results on different scales. Next, I process the way how we measure thermal resistance of each databases of clothing. Measurements are placed in climate chamber in VUT Brno and we are using manikin Newton made by Measurement technology Northwest. In the end, we mention some results and comparison of both genders.
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Design of compaction plate
Svatoš, Ivo ; Pokorný, Jan (referee) ; Škopán, Miroslav (advisor)
Design of compaction plate as additional equipment for excavator or loader. The first part of thesis describes individual part of compaction plate and treat of the most frequently used solutions. The second part is an overview of product of selected manufactrers. The third part considered of cencrete design of compaction plate in accordance with submission. The output is drawing of scheme and most functional calculation.
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Model ranges analysis of threshing machine
Palík, Milan ; Pokorný, Jan (referee) ; Kašpárek, Jaroslav (advisor)
The scope of this bachelor work is to give the basic information and explain the functionality of particular harvester thresher mechanism and confront their synthesis and product mix from different producers. The agricultural engineering sale is large and that is why the first step of the usage will be the company literature and then professional magazines will be given. This work is mainly made through the use of visual documentation, which afford explanation of existing mechanics principle, their particular structural design and summary of producers. Then there will be mentioned their percent sales representation and the confrontation according to the efficiency classes. The attention will be first of all paid to the best in this field, for example to the companies, which are engaged in picking engineering production for cereals, as are for example companies Claas, Fendt. Case IH or New Holland.
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Self-locking mechanism for transport concrete pillar
Folprecht, Michal ; Pokorný, Jan (referee) ; Kašpárek, Jaroslav (advisor)
The thesis is focused on the fastening and transportation of load concrete pillar of given parameters. The goal is to design suitable kinematics of self-locking mechanism to secure the pillar. Handling of design solution contains functional and strength calculation of individual parts of mechanism including its 3D visualization supplemented with drawing documentation.
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