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Vysušování zdiva, sterilizace biotických činitelů pomocí mikrovlnné technologie
Sobotka, Jindřich ; Jiroušek, Zdeněk ; Šuhajda, Karel
Microwaves are electromagnetic waves of frequencies from 300 MHz to 300 GHz, corresponding to wavelengths from 1 m to 1 mm. For industrial application is allowed more frequencies, but we are mainly interested in the frequency 2 450 MHz, a wavelength of 12,2 cm, which we use in our applications. The heating occurs so that the electric field in the water molecules orient themselves according to polarization. Microwaves belong to a large family of electromagnetic waves, which also includes the visible light, which is governed by Maxwell's equations. Principle of microwave drying is based on the vibration of water molecules in the mass of masonry, of heat generated by their movement and friction, the conversion of water vapor and subsequent venting these few. Vibration of water molecules is the primary storyline in the process. Water molecules under these conditions are able to get rid of its energy potential, which is bound to the capillaries in the building material and prevents evaporation.
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Efficiency Analysis of Mechanical Redevelopment Methods with a Focus to the Problems of Joints of Inserted Materials
Mizerová, Lenka ; Tichomirov, Vladimír (referee) ; Myslín,, Jiří (referee) ; Solař,, Jaroslav (referee) ; Beneš, Petr (advisor)
Parameters that characterizes quality internal building environment come forth these days. One of the main reasons for the choice of the topic of this thesis is to ensure the quality of the internal environment and well-being during the usage of the buildings. Prevention of the excessive wall dampness is one of the basic conditions of a healthy and quality building environment. The thesis verifies reliability and compares the efficiency of the selected damp-proof materials and its joints. The first part deals with the influences that are reasons for the dampness of the buildings, earmark of an interest area, introducing of the valid legislation focused on the building redevelopment, consideration and evaluation of the building constructions in light of the dampness. The next part of the thesis sets main and partial targets and consecutive steps leading to fulfilment of the targets. Selection of the appropriate redevelopment procedures, materials and joints of the selected materials selected for the experiment realization follows. As this area is relatively large, we selected mechanical redevelopment methods reaching the walls and three most commonly used materials and its joints within the framework of the selected methods. There are three main steps set in the thesis: preparation of the methodology and experiment realization, measurement optimization and measurement within the laboratory and on the real buildings, comparison and evaluation of the measured values. Experimental part of the thesis took place between the years 2008 - 2011. Experiment realization comprises of material acquisition, building of the test samples and application of the single redevelopment measures. The next step includes measurement on the individual samples on the fixed measuring points. Measurements are evaluated through the mathematical statistical methods. Efficiency of the particular materials are compared and evaluated.
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Separation of water drops from jet of steam
Miček, Michal ; Baláš, Marek (referee) ; Pospíšil, Jiří (advisor)
This thesis is focused on separation water drops from jet of steam. Liested are some of basic principles of separation of moisture and particles, as well as equipment, which are using these principles. Furthemore, this thesis include the part devoted to water drop formation during condesation of vapor. Last part is focused on the design of cyclone separator.
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Re-design of biomass boiler for very wet fuel
Zbořil, Martin ; Skála, Zdeněk (referee) ; Lisý, Martin (advisor)
The aim of this thesis is to calculate the stoichiometric balance of boilers and boiler fuel for normal monture to 60%. Determine the monture, content depending on the conditions of the fuel in the combustion chamber and conditions of combustion. Experimental analysis of the current state of the boiler ZKG measurements using this device and propose modifications and solutions.
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Comparison of properties of alternative pellets
Jansa, Oldřich ; Moskalík, Jiří (referee) ; Baláš, Marek (advisor)
This thesis deals with the alternative pellets and the means of production from raw material to final customer. The theoretical part deals with different techniques and manufacturing technologies used. Furthermore, the work deals with Czech and European legislation in the field of fuel pellets. The practical part deals with measuring and comparing the properties of selected standard pellets.
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Wet surfaces drying using air streams
Gusnarová, Hana ; Hejčík, Jiří (referee) ; Hejčík, Jiří (referee) ; Jaroš, Michal (advisor)
Diploma thesis submit processing and evaluation of experiment which was made at University of Hertfordshire. Aim of this experiment was practically confirm and compare efficiency of drying bottles with blower and compressor. The next purpose was to suggest solution against recondensation on dry surface of bottles. Diploma thesis involves also economy calculation. In the diploma thesis was described issues of drying and condensation, realized analysis of drying equipment and methods of air conditioning. As the most suitable and the most cost effective way of drying was at the base on experiment and energy and economy calculation chosen tested turbo blower 587. As the solution, against recondenzation was created anticondensation tunnel. As the most suitable way for condition the dew point inside the tunnel for require value was chosen desiccant rotor Munters.
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The research of cause of failure of concrete elements Face Block
Eger, Lukáš ; Husařík, Petr (referee) ; Dufka, Amos (advisor)
This master thesis focus on the analysis of effects that cause defects in concrete blocks. Experiences show that the defect of the blocks are often manifested in the form of cracks. Great rate of occurrence of defects is attributed to volume changes of poor quality concrete filler. The aim of this master thesis is to analyze the finding from the practical use and exploration of the requirements for the actual blocks and especially the concrete filler which is used to make monolithic structures built from these blocks. The attention will be paid to the interaction between the block and the concrete filler. Here we focus mainly on the volume changes caused by a change of moisture level and especially the cyclic moisture.
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Influence of changes in concrerte pore structure on actually durability of reinforced and pre-stressed structures.
Kovalčíková, Hana ; Adámek, Jiří (advisor)
This master thesis deals with a durability of concrete, which has become the centre of the interests of international scientific insitutes during the last years. The resistence of reinforced concrete depends on the covercrete which the aggresive liquids and gases penetrate through from the environment to reinforcement. According to the ability of the covercrete to penetrate degradative species is possible to tell the durability of concrete constructions. In experimental part we look for the actual state of covercrete, ordinary and high strength, by combination of various experiments. We can find here the test´s results of water and gas permeability and absorbability and sorption of concrete which complete the permeability tests. In final part the impact of different concrete types on durability of reinforced concrete is discussed.
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