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RekordModeling of air-flow in assembly hall supported by mechanical ventilation system(Państwowa Szkoła Wyższa im. Papieża Jana Pawła II w Białej Podlaskiej, 2013)The aim this paper is to present the results of simulations of mechanical ventilation system performance in assembly hall of the Faculty of Environmental Engineering, Lublin University of Technology. Simulation was conducted using Autodesk CFD Simulation 2013. 3D model of the assembly hall was created in Autodesk Revit Architecture application, which is directly connected to CFD Simulation program. There were conducted two variants of simulations: for winter conditions and for the summer performance. Obtained results enable to verify temperature values and air-flow velocities in the modeled room in each place and time. Conducted simulations showed that there are the areas with air parameters do not satisfying the design assumptions, required for thermal comfort and the correction of the applied solutions is needed. Air flow velocity distribution in the examined assembly hall, determining the indoor air parameters depends on many factors that were not considered in the described system solutions. The most important factor is temperature of the external barriers and the particular geometry of the room. Their consideration was only possible after creating the spatial model of the room and the ventilation system.
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RekordWaterproof impregnation of ceramic brick with emulsions of low voc content(Państwowa Szkoła Wyższa im. Papieża Jana Pawła II w Białej Podlaskiej, 2013)The aim of the research presented in the paper was to evaluate the feasibility of using hydrophobizing preparations based on organosilicon compounds for impregnation of ceramic bricks. The process of surface hydrophobization both using solvents and water substances was analyzed. The effectiveness of four preparations which differed in terms of hydrolytic polycondensation degree, viscosity and concentration, as these are the factors that are decisive as far as the end result of hydrophobization is concerned. The following laboratory tests were performed: the analysis of physical properties of the tested materials, water drop absorption test, water absorption by weight of the hydrophobized samples, water vapour diffusion, frost resistance, the analysis of silica gel properties in electron microscopy. Based on the results of the above mentioned, the analysis of effectiveness and desirability of hydrophobization using emulsion with a low VOC content was carried out.
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RekordConformity testing of concrete compressive strength based on overlapping groups(Państwowa Szkoła Wyższa im. Papieża Jana Pawła II w Białej Podlaskiej, 2013)Conformity testing carried out according to the standard PN-EN 206-1 concerning compressive strength allows the use of two computational procedures. Standardized criteria are checked on a series of a fixed number, created with subsequent strength measurements. The series may overlap or be non-overlap. This paper presents the analysis of the risks borne by the manufacturer using these computational procedures carried out during the compulsory conformity testing. The risk assessment was carried out by means of the operating characteristic (OC-curve). Probabilities of acceptance have been determined using the Monte Carlo simulation method . The calculations of results have shown that the aggregation of data in the series does not affect the risk of rejection of a „good” concrete batch. The author recommends conformity control based on the results of overlapping sequences due to the possibility of early detection of non-compliance, which gives the opportunity to take corrective action as soon as possible.
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RekordPossible applications of natural fiber and straw of flax and hemp in the construction industry(Państwowa Szkoła Wyższa im. Papieża Jana Pawła II w Białej Podlaskiej, 2013)High energy consumption, carbon dioxide emission, air pollution and slow depletion of conventional fuels contribute to the production of various building materials. The idea of sustainable development in the construction industry is to reduce these effects to a minimum by seeking alternatives such as ecological and energy efficient building materials and technologies of their production. More importantly, the economic dimension expressed by lower operating costs of energy efficient buildings is a relevant issue. The purpose of this paper is to present the possibility of using natural resources in the production of building materials. The article describes the characteristics of lightweight composites composed of natural fibers and straw from flax and hemp, on the lime binder modified with different additives and admixtures. The pilot study, executed in several European countries including our own, was described on the basis of world literature which focuses on mechanical and thermal properties of these materials. In addition, other uses of flax and hemp, known in the construction industry for a long time, were presented. As far as conclusion is concerned, the current progress in the study of these materials was evaluated. The obtained results indicated the direction for further development of research and allowed to assess the potential for wider application in construction industry.
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RekordReview of research on recycling of waste materials to produce bricks through firing(Państwowa Szkoła Wyższa im. Papieża Jana Pawła II w Białej Podlaskiej, 2013)This paper presents a review of global research on the use of waste materials for production of ceramic building bricks through firing. Main objectives of the directive of the European Parliament and of the Council on waste materials and recycling thereof have been presented herein. Brick production technologies, that have been developed, contribute to improving the natural environment due to the use of waste materials in these technologies. The concept of production of ceramic materials based on waste materials aims at raising awareness with respect to energy saving and environmental protection.