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Brno, Czech Republic

Hrich K.,Fakulta Stavebni | Groda B.,Mendel University in Brno
Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis | Year: 2010

This work is focused on determination of adsorbable organic halogens (AOX) concentration in the digested sludge from the sewage treatment plant and the losses of this component during dewatering and drying of sludge. Drying of the sludge from wastewater treatment plant is not extended too much in Czech Republic. In this work, the AOX are monitored, because AOX is one of the limits restraining use of the sludge on an agricultural land. Another reason is technological demand for using the sludge in cement processing, because chlorine in AOX can cause decrease in a heat transfer effect in a cement kiln. It is clear from the results that both centrifuged and dried sludge from the sewage treatment plant Brno fulfilled limits for using sludge on agriculture land. They can also be composted, in case they meet other requirements. If not, it is a possibility of co-incineration in cement kiln. In such case, limit for total chlorine including the AOX is required too. This limit was not exceeded. Another aim was to calculate a mass balance of AOX during the centrifugation and drying processes. It was found out, that after centrifugation the main part of AOX remained in the centrifuged sludge (96.4%). The rest was drawn-off with reject water. 60 % of AOX in the reject water were dissolved compounds. A similar situation occurred during the drying process. More than 99 % of AOX was bound in the dried sludge. The air and vaporised water contained such quantity of AOX, which corresponded with the amount of the dust in the air and the amount of particles of sludge in vaporised water. Source

Ticha A.,Fakulta Stavebni | Podhrazska J.,Vysoke Uceni Technicke v Brne
Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis | Year: 2011

Land consolidation can be defined as the spatial and functional arrangement of lands. By the process of land consolidation the ownership rights to land are settled and conditions for the rational management of land owners are created. The plan of common facilities is an important part of the land consolidation project. It is a set of measures creating conditions for access to lands (traffic network) and conditions for improvement of the environment (land resources conservation and development, water management, enhancement of landscape ecological stability). The costs of land consolidation are covered mainly by public resources. Considerable investment costs are necessary for the implementation of structures. The volume of investments is given by the estimation of construction costs. The cost indicator of a structure of common facility (CICF) can be used as a ratio. Among other things, this paper presents the catalogue of construction works for representative structure of common facilities, including the prices and a card of the cost estimation. These data may be used for a better orientation in the price level of particular items by both employees of land authorities and construction companies competing for contracts during the awarding of contracts for public procurement. Source

The contribution deals with prediction of extent of the renovations of the existing building stock. A common strategy to achieve energy efficiency is utilization of funding programs. It is only one of the options to achieve the established goals, but it is used the most often. The problems are usually obtaining necessary amount of money and the impact on the behaviour of the whole system of deliveries for the implementation of energy saving measures. The basis of the dynamic model is a subsystem of the building stock, which is supplemented by a subsystem of the renovation funding. The model is specially aimed at testing of the impact of repetitive funding programs, including the influence of the investors' behaviour. Simulation was run for case of the Czech Republic, for a period of ten years with two funding programs. The output parameters are time changes in the inventory of potential projects and refurbished buildings expressed as floor area of buildings. Source

Hlavacek P.,Fakulta Stavebni | Smilauer V.,Fakulta Stavebni | Padevet P.,Fakulta Stavebni | Nasibulina L.,Aalto University | Nasibulin A.G.,Aalto University
NANOCON 2011 - Conference Proceedings, 3rd International Conference | Year: 2011

The carbon nanotubes were synthetized directly on the surface of Portland cement particles. Mixing this new carbon/cement material with ordinary cement creates a modified cementitious substance, where carbon is perfectly dispersed in the volume. In presented work, the fracture energy and compressive strength of cement paste/mortar created from this new material was measured. The composites with weight fractions of carbon nanotubes/paste in the ranges 0-0.038 were prepared and mechanically tested. Slight increase in fracture energy and compressive strength was observed even in the low carbon weigh fraction 0.019. © 2011 TANGER Ltd., Ostrava. Source

Balounova M.,Fakulta Stavebni | Greco F.,Fakulta Stavebni | Kabele K.,Fakulta Stavebni | Kabele P.,Fakulta Stavebni
Vytapeni, Vetrani, Instalace | Year: 2015

The paper presents a study performed on the case of the church tower of the Sacred Heart of Jesus church in Prague Vinohrady, documenting the application of the energy simulation for analysis of static failures of historical constructions. The simulation software, commonly used for modelling of building energy behaviour and indoor environment quality (BPS), was used to substitute long term monitoring of the real temperature conditions. Software DesignBuilder GUI was used for the modelling, working on a computational core of the EnergyPlus, which is based on the one-dimensional model of conduction heat transfer in multilayer constructions with calculated convection coefficient. The BPS simulation took into account the effects of the climate, such as solar radiation, changes of temperature and humidity, wind speed and direction at the scale of the building model (macro-scale), for the period of one year, with detailed time-step 30 minutes. It assessed the course of the surface temperatures of individual perimeter walls constructions elements of the monitored building. The obtained data were consequently used as a load in numerical thermomechanical analysis of the construction damaged by the static failures, which is commonly carried out when there is a suspicion of a stress caused by temperature changes. The results of the analysis confirmed the hypotheses that the static failures were formed due to the thermal stress. Source

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