III 2014

The light and dark sides of energy efficiency of glass facades
The article presents a short characteristics of the factors infl uencing the energy effi ciency and thermal characteristics of glass facades used in Poland. Since the type of glass used in facades signifi cantly affects their energy efficiency, a characteristics of solar-active glass which is capable of changing its optical properties is also provided. Furthermore, the article includes information on complex calculations of the thermal balance taking into consideration the solar power generated owing to the application of modern technologies of active glazing of large areas.
Irena Ickiewicz Ph.D. Eng.

Clay in Armenian architecture
The article is based on own research through excavations and on data from the literature, and describes the use of clay in Armenian architecture from ancient times up until now. Clay (raw and baked) usage in architecture is diverse. Clay fireplaces, ritual vessels, altars, and fireplace housings, often adorned with zoomorphic elements, can be commonly found throughout the whole history of Armenian architecture. Issues related to the use of clay in interior design, courtyards of buildings, and as decorative art in public space are discussed.
Lilit Ter-Minasyan M.Sc.

Life Cycle Assessment of Float Glass
Life cycle assessment of float glass for building engineering was carried out using the Eco-indicator 99 method in the range “from cradle to gate”. It has been shown that the highest loads are connected with the resources category, whereas those connected with the human health category are nearly two times lower. Environmental hazards resulting from glass manufacture are to a relatively small extent connected with the ecosystem quality category. Fuels, particularly natural gas, are primarily a source of burdens. Among the mineral raw materials examined it is primarily soda determines the level of environmental hazard.
prof. UTH Ryszard Świetlik Ph.D. Eng.

The technological properties of SiC based slurries for manufacturing of ceramic shell moulds for aerospace industry
In the present paper technological properties of silicon carbide slurries in manufacturing shell moulds for investment casting of aircraft turbine elements were studied. Ceramic SiC slurries with a solid concentration of 65 wt. % were applied. As a structural binder polymer nanocomposite containing nano Al2O3 was used. The poly(vinyl alcohol) (PVAL) 47-88 with molecular weight 47000 g/mol and hydrolysis degree 88%, used as a modifi cation binder was added at different amount: 6, 10, 15 wt. %. Characterization of SiC powder was made by: grain size by laser diffraction, Scanning Electron Microscopy (SEM) and X-Ray diffraction (XRD) methods. The properties of ceramic slurries such as: relative and dynamic viscosity, density, pH, plate (plate weight test) and wax adhesion were studied by a range of techniques. These measurements were taken in laboratory conditions by 96 hours at temperature 21oC.The results shows that slurries based on SiC, nanocomposite binder and PVAL meet the investment casting requirements of aircraft turbine parts and had promising properties.
Paweł Wiśniewski Ph.D. Eng.