Technical Transactions iss. 15. Architecture iss. 8-A

Technical Transactions iss. 15. Architecture iss. 8-A

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Collection items (24)


Phase change materials vs. internal temperature in a building

Zastawna-Rumin, Anna
Article
2014
The article presents results of simulation of building assuming presence of phase change material in wall barriers. Obtained results were compared with the ones of a building without phase change material in wall barriers. Object of comparing calculations is a model of a real service building located in Silesia. It has light-frame construction with light covering (external metal sheet, heat-insulation, interior metal sheet). In subsequent examinations, the presence of 1 cm thick PCM board placed under the inner surface of a metal sheet was assumed. Tests were conducted for organic materials that undergo phase transition in different temperatures such as 23°C, 25°C, 27°C or 29°C. Based on results of operative temperature measurements, it is possible to determine PCM influence on the building overheating risk.

The influence of glazing type, frame profiles shape and size of the winodow of the final value of window thermal transmittance U

Rojewska-Warchał, Małgorzata
Article
2014
The paper presents the analysis of the relation between window thermal transmittance and the window shape, size, frame profile, glazing type and opening area division. The analysis was performed in the Window 6.3 program developed by the Lawrence Berkeley National Laboratory, which has the possibility of a comprehensive analysis of the heat flow through the various types of windows, according to the current assessment procedure developed by the National Fenestration Rating Council (NFRC) and comply with ISO 15099. For the purpose of the analysis a number of computer simulations of various window frames were conducted.

Innovative timber construction systems in terms of design and structure physics solutions

Radoń, Marcin, Nowak, Grzegorz
Article
2014
This paper presents examples of modern timber building systems. The beginnings of the wooden structure systems of frame and massive structure as well as new solutions with reference to traditional ones are presented in the paper. Modern timber systems presented in the paper are selected in such a way as to show the diversity of their structure. Examples of systems based on logs, beams and plate (solid and boxes) elements are shown in the paper. Description of each system contains information about the basic elements of the structure, connection methods and materials used in their production. Degree of prefabrication and assembly methods are also discussed. Special attention is paid to the issues of the building physics of wooden partitions, thermal parameters and the thermal bridges in these structures.

Internal thermal insulation in the technical and architectural aspect

Orlik-Kożdoń, Bożena, Włodarczyk, Michał, Steidl, Tomasz
Article
2014
The paper presents the possibility of applying the internal systems of thermal insulation of heated rooms with design guidelines. It discusses the problems of the inner insulation effect, the re-use and new aesthetics on comfort room thermo-humidistat.

Examination of a wall barrier containing phase change material in a climate chamber

Nowak, Katarzyna, Zastawna-Rumin, Anna
Article
2014
This paper presents the results of the experimental tests of components containing alternating phase material. The measurements of a light frame wall, in two options: plate with internal drywall filling and plate containing phase variable material, were conducted in a climatic chamber. The temperature and heat flux density distribution on the surface of plates for non-stationary temperature conditions in a climatic chamber were analyzed. The research stand simulated the conditions where the cladding plates were heated with the increase of internal air temperature rather than through direct heating. The main goal of the experiment was to check the utility of the test procedure and the measurement equipment to the planned research of building components containing PCM.

The impact of detail solutions in the wooden building structures on the thermal parameters of the enclosure

Kram, Dorota, Nowak, Katarzyna
Article
2014
As far as modern building technological and material solutions, wood-based constructions are more often applied. New technologies in wood constructions allow to design and construct buildings in low-energy and passive building standards. Producers of system solutions provide the catalogues of different system construction details. The aim of this article is the analysis of thermal bridges of different solution details of both, framework and massive board wood construction. The analysis were conducted in THERM 6.3 program, prepared by Lawrence Berkley National Laboratory. THERM enables to model the effects of twodimensional heat flow effect and is based on finite elements method, which allows modeling of both simple and geometrically complicated building components. All the results of software calculation facilitates the analysis of the heat exchange and finally allows for the estimation of energy effctiveness. Analyzis of local temperature values allows for assessment of condensation and mould growth problems.

On rational design of low energy building external components

Kisilewicz, Tomasz
Article
2014
An attempt at the verification of simple designing rules of chosen building components is made in this paper, taking into account not only heating energy demand but also avoidance or at least reduction of cooling demand. Large south-oriented windows supply a large amount of solar energy and thus minimize the heating demand. Oversized windows and the resulting large energy gains, which are not accumulated in building’s thermal capacity and used immediately for heating, do not reduce energy demand but create unbearable conditions or a big cooling load in living spaces. A green flat roof is today a very popular solution. Its insulating and dynamic properties have been evaluated.

The influence of new material technology on acoustic treatment of modernized interiors

Kamisiński, Tadeusz, Kinash, Roman, Pilch, Adam, Rubacha, Jarosław
Article
2014
The paper deals with the problem of the acoustic treatment using modern material technology in the modernization of old interiors. On the example of an auditorium with approved acoustics, that was built in 1962 and is located at the Lviv Polytechnic, some important directions in handling this type of object was shown. The acoustic measurements of the room showed, that structures used in the 60s are acoustically proper, but planned renovation should be based on modern technologies.

The deterioration of strength and thermal properties of autoclaved aerated concrete as a result of capillary moisture

Garbalińska, Halina, Bochenek, Magdalena
Article
2014
In modern construction there appear two parallel independent trends. On the one hand, large emphasis is put on raising durability of construction works implemented through the selection of appropriate materials with parameters tailored to the specific conditions occurring during the operation of the building. On the other hand, great importance is attributed to the problem of energy-efficient building design, which is reflected in the increasingly stringent records of existing legislation. In this paper some questions were raised concerning the both issues. The article presents the results of autoclaved aerated concrete studies, in particular, the deterioration of its strength and thermal conductivity due to moistness.

Airtightness of the large panel buildings before and after thermal modernization

Dębowski, Jacek, Nowak, Katarzyna, Nowak-Dzieszko, Katarzyna
Article
2014
The airtightness measurements of the system buildings are very important. They allow, together with the infrared tests, to verify all undesirable system joint leaks, which significantly increase the heating energy needs. In the article the results of airtightness measurements of two flats, built in system W-70, were presented. One of the buildings is after thermal modernization. During the leakage tests the system joints were monitored with the infrared camera. Thermograms, presented in the paper, confirmed the assumption about the negative influence of joints on the total building airtightness. Described tests are a pilot studies of the problem and provide the starting point to the further measurements on the statistical level.