Technical Transactions iss. 19. Civil Engineering iss. 5-B

Technical Transactions iss. 19. Civil Engineering iss. 5-B

Type: Collection of magazine numbers
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Collection items (48)


Comparison of detailed and simplified window frame modelling in terms of influence on surface temperature

Zozulák, Marek
Article
2014
Window frame profile modeling methodology is varied. Simplified and detailed models were considered and results from transient calculation of surface temperature were compared. As is shown, the detailed window frame profile modelling has the influence and whether it is useful or not depends on purpose of modelling.

Social-economic benefits of a novel photovoltaic/loop-heat-pipe system and its adaptability in building energy plant

Zhang, Xingxing
Article
2014
This article describes a novel photovoltaic/thermal (PV/T) water heating system. Through incorporating a loop-heat-pipe (LHP) and a heat pump, the system can essentially maximise the electrical return of PV panel, and simultaneously produce a reasonable amount of heat. This system can therefore harvest larger amount of solar energy and enable enhanced system performance. It is expected that such dedicated technology could become the next generation of solar driven heating system and enable a significant reduction of building’s carbon footprint.

The influence of phase change materials on energy balance and the risk of overheating

Zastawna-Rumin, Anna
Article
2014
The paper presents the results of a computer simulation of a building under the assumption of the presence of a phase change material in wall elements. The influence on the cooling energy requirements and, also, the risk of overheating of the low-energy building (without HVAC systems) have been analyzed. The obtained results were compared with the ones of a low-energy building without a phase change material in walls. The comparison calculations were performed for a model of a service building located in Silesia, which is built according to an energy-efficient standard. It has a light-frame construction with light covering (external panels, heat-insulation, interior plasterboard). In the study, the presence of a 1 cm thick PCM board placed under the inner surface of plasterboard is assumed. Tests were conducted for organic materials that undergo phase transition in different temperatures, such as: 23°C, 25°C and 27°C. Based on the results of operative temperature measurements, it is possible to determine the influence of PCM on the risk of building’s overheating.

General-purpose unmanned research vessel used for measurement of water depths in reservoirs and their deposits layout

Wolak, Andrzej, Przecherski, Piotr
Article
2014
Large artificial water reservoirs are one of the most valuable assets in flood protection. However, the overall volume of a reservoir can decrease over time. This happens mainly because of sediment accumulation, and that alluvia is “eating-up” an otherwise useful volume of water. It is therefore important to know the current volume of sediments accumulated in the reservoir. This way one is able to calculate the useful volume of the reservoir storage capacity, secondly, for assessment of future reservoir operation. The process of obtaining relevant data for this is normally partially automated but nevertheless, it is arduous, extremely time-consuming, and may be dangerous. To overcome those problems we have developed an unmanned vessel, which is able to perform the work much faster and easier. The vessel is a fully unmanned, integrated, nonetheless it is still under development (working prototype 1E), but it can be still easily used in its current state, albeit with some minor limitations.

Comparison of experimental and numerical models of LONGASF railway foundation

Urbanek, Małgorzata, Pawlak-Burakowska, Aleksandra
Article
2014
This paper outlines the innovative concept of unconventional railway track on longitudinal sleepers and asphalt track bed. The authors presented a method for LONGASF numerical modeling. This paper describes the creation of the numerical model at the macro scale according to the behavior and interaction of analyzed laboratory sample in a micro scale.

Collation of qualitative research with quantitive fem research in terms of two dimensional heat flow

Topolski, Michał, Żurek, Jakub, Gintowt, Jolanta
Article
2014
The paper concerns an attempt to collate qualitative research with quantitative FEM research in terms of two dimensional heat flow. It shows the accuracy of both methods, according to in situ researches with a thermal camera and models – done with software Therm 5, Therm.

Vision & reality – glückstein quartier – conceptual design of a housing estate in the technology of passive house – project analysis

Tabak, Paulina, Stanuszek, Kinga, Gintowt, Jolanta
Article
2014
The article is about the concept of a housing estate in Germany. The project was created as a part of a competition. The contest was organized by the ISOVER Company. The name of the contest is ISOVER Multi-Comfort House Students Contest Edition 2013 Vision & Reality – Glückstein Quartier. With reference to a historical place which belongs to our place, the development has been called “diamond apartments” Houses have a shape like the crystal of a diamond. The way of creation, location, and building shape assure the maximum usage of solar energy, so that there will by optimal thermal comfort inside. The project also includes a large scale service and entertainment building complex, located in the immediate vicinity planned residential development.

Modeling technological and organizational variants of building projects

Śladowski, Grzegorz
Article
2014
The paper addresses the possibility to utilize alternative-decision networks to model and analyze technological and organizational variants of building processes [1]. The undetermined structure of such networks makes it possible to simultaneously model any given number of variants of the scrutinized project and, as a result of the network’s analysis, to select the solution (variant) which is optimal within the set criterion. The paper attempts to broaden thevertex set of the subject network by adding two logical formulas on the side of the peak entrance: namely „and” and „or” to make the modeling of certain technological and organizational relationships of a construction enterprise easier. Introducing new vertices into the network required extending the mathematical model used to determine the optimal technological and organizational variant of the analyzed enterprise.

The applications of numerical modeling for the optimization of the operation of energy devices on the example of an air distribution system inside the biomass boiler

Szubel, Mateusz, Siwek, Tomasz
Article
2014
The paper addresses the results of a numerical – based on experimental data – study of air distribution in the manifold responsible for air supply into a combustion chamber of a biomass boiler. An analysis of the possibilities of optimizing the air distribution system using a ommercial CFD program by changing the diameter of the feeding ducts was performed and described.

Analysis of photovoltaic systems for French households

Sznurawa, Alicja
Article
2014
The analysis, which has been conducted for four households in France, has shown that the use of photovoltaic panels for electric energy production has been economically effective. The analysis has been conducted using RETScreen® International software and compared with real data form system owners. The calculations were based on daily solar radiation and have been demonstrated using a simple payback period and internal rate of return. The majority of the photovoltaic system’s necessary cost has been taken into account. The calculations have demonstrated that a simple payback time for systems set before 2012 is below 10 years, which is a half time of panels’ life span. Moreover, the ecological effect on producing electric energy using analyzed systems has been calculated.