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The energy independent flow meter with remote reading
Šindelář, Jindřich ; Růžek, Václav (referee) ; Dřínovský, Jiří (advisor)
The thesis is focused on the design of a self-powered sensor for measurement of water flow rate and temperature in water pipelines. The key block of this thesis is the construction of an electric generator powered by excitation with turbulent flow. The generated voltage should power the sensor's circuits and allow water flow rate measurements. Throughout the development, three prototypes of generators powered by turbulent flow were created. Turbulences were not created by an insertion of a bluff body but by inner geometry of the pipeline elements. Maximum power of 10,66 uW was generated at flow rate of 8 m3/h. Afterwards, a prototype of water flow rate and temperature sensor was assembled. Energy self-sufficiency of the device at common flow rates was not achieved using the chosen procedure. The designed flow rate measurement method is suitable for an approximate flow rate estimation.
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Power supply of electrostatic separator
Broďák, Kamil ; Pazdera, Ivo (referee) ; Huták, Petr (advisor)
The diploma thesis focuses on the problems of electric power precipitators. Due to their current dominant position, the work concentrates on the sources of single phase transformers operating at the frequency of 50 Hz controlled by thyristors. The first part describes the electrostatic precipitator and its principle. This is followed by a brief insight into the proposal for an electrostatic precipitator. The work also explains the high voltage source that is divided into a transformer with a rectifier and into a control box with power circuits and control circuits that provide the power supplied by a transformer. The work also offers an explanation of the HV source system that operates at different conditions. The last part suggests a proposal for cooling cabinet including thyristors, for power line control box resources, for a supply line and a line to the transformer.
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Measurement of the fans characteristic
Coufalík, Martin ; Štětina, Josef (referee) ; Katolický, Jaroslav (advisor)
This bachelor thesis discusses a fan characteristics and their measurement. The aim of this thesis is to compare the results of measurements, which were done in certified laboratory with results of measurements done in alternative measuring stands. In first part of the thesis are described the basic types of fans and inclusion fans in turbo–machines. Furthermore, the thesis deals with a particular fan, which is part of the combustion system of condensing boiler. This fan is also the object of measurement in practical measurements, which were measured as a part of this thesis. This practical part of the thesis includes also analysis of test track, the measurement procedure and all calculations according to ISO ČSN 5801. At first were carried out measurement in certified laboratory and then in three different measuring stands. In conclusion were these results compared with optimal results.
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The influence of decreasing of impeller diameter, change Q - Y characteristic
Hyriak, Maroš ; Habán, Vladimír (referee) ; Haluza, Miloslav (advisor)
The purpose of the thesis is to familiarize with the fundamental characteristics of ta centrifugal pump while changing geometry of the output section of its impeller trimming. Characteristics of a pump is calculated whilst diameter of the impeller is changed. More specifically, changes in the flow and energy are observed while diameter of the impeller is decreasing. Two possible solutions, approximate and accurate, are offered for both parameters. The thesis suggests that an application of the approximate solution is satisfactory for the flow calculation of the impeller. In contrast, for the energy calculation is the approximate solution sufficient only in case of the slight trimming. Increase in the trimming results in the drop of the hydraulic efficiency and decrease in the accuracy of the results. Consequently, the accurate solution is recommended for the energy calculations. Limitations of the paper may be represented by two facts. First, in comparison with the calculations, results are in reality affected my numerous variables that have not been included in the calculations due to their unpredictability. Second, calculations were based on the several assumptions that are rarely met in the reality. The results of the thesis are applicable in the every-day life when adapting the pump to the customer needs.
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The comparison of water and matter flows in small catchments in the Šumava Mountains depending on landscape management.
VÁCHA, Aleš
The present thesis deals with the comparison of water flow and quality of water flowing from small watersheds under different farming methods on the right bank of Lipno in the Bohemian Forest. Watersheds are comparable to its size, exposure, altitude, climatic conditions and differ in land use and management. Solution in bachelor thesis contributed to more accurate flow measurement and analysis of data from 2008 to 2013. The evaluated results show that the drained basin used as pasture (Mlýnský) has drained in average of 70 %, the runoff in the watershed covered with forest, wetlands and meadows (Horský) is 39 % and the runoff from watershed covered with forest (Bukový) is 33 % of water, that the basin falls in precipitation. During the period the average annual water flow rates were 43.1 l.s-1 with a maximum of 662.9 l.s-1 on Mlýnský creek (2 June 2013), 28.6 l.s-1 with a maximum of 451.2 l.s-1 on Horský creek (2 June 2013) and 24.5 l.s-1 with a maximum of 220.0 l.s-1on Bukový creek (2 June 2013). The greatest variation values were recorded in the catchment area of the Mlýnský creek. The results show a direct correlation between the values of runoff and the amount of dissolved solids expressed through the electrical conductivity of the water. The average value of conductivity is 84 ?S.cm-1 in Mlýnský creek, 43 ?S.cm-1 in Horský creek and 39 ?S.cm-1 in Bukový creek. The solution in bachelor thesis confirmed that land use is an important factor in the watershed water balance and also in the quality of the effluent.
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Comparison of long term values of discharges and concentrations of selected substances in pasture area of Jenín
KAŇOKOVÁ, Markéta
The aim of this thesis is to evaluate the flow rate in pasture-way cultivated catchment area of Jenin stream and concentrations of nitrates and phosphorus in the stream during the period of 2004 - 2012. For this purpose individual time series of the flow-rate values and concentrations of selected substances were processed. The catchment was divided in two subcatchment areas labeled J1 and J2. The results were compared with the previous ones from the period 1983 - 1985 while the area was used as an arable land .
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Evaluation of water quality and runoff characteristics in the Jenínský stream catchment.
KROPÁČEK, Robin
The aim of this thesis is to evaluate water quality and runoff characteristics in the Jenínský stream catchment. For this purpose analysis and data processing was performed. Two subcatchments, called J1 and J2, were monitored at this catchment area. Period of interest involves years 2008-2012. Results were compared with the period 1983-1985 when most of the land was used as arable land. The decrease in the concentrations of all evaluated indicators was caused by grassing and reduction in the use of fertilisers. Ranges of the values of selected indicators also decreased distinctly and their concentrations are stabilized. The greatest decrease of 79% (J1) and 87% (J2) was found in average ammonium concentrations. A beneficial effect of land use change to extensive agricultural management on water quality was proven.
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Rainfall - runoff parameters selected basin Stropnice
FRAŇKOVÁ, Diana
Dissertation work rainfall-drainage parameters on chosen river-basin Stropnice is dealing with measurement of drainage value of surface water on five specific profiles in the area of Horní Stropnice. The goal was discovery and analysis of information on the river-basin Bedřichovský, Pasecký and Váckový stream, Humenická dam and in closure profile at Tomkův mill in the years 2007 {--} 2010, where there were monitoring heights of water level. After substitution into discharge-rating curve were scoring flow rate for individual parts of river-basins and examination of influence Humenická dam on flow rate wave in the closure profile. Between the upper specific profiles of individual streams above Humenická dam and specific profile by the Tomkův mill there was not found any influence of Humenická dam on flow wave in the river basin of Stropnice.
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