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4 results on '"Bulacu, Cezar"'

2. Improving Indoor Air Quality by Using Sheep Wool Thermal Insulation.

Author

Hegyi, Andreea, Bulacu, Cezar, Szilagyi, Henriette, Lăzărescu, Adrian-Victor, Meiţă, Vasile, Vizureanu, Petrică, Sandu, Mihaela, Milani, Gabriele, and Sandu, Andrei Victor

Subjects
*WOOL, *THERMAL insulation, *WATER vapor, *INDOOR air quality, *SHEEP, *AIR quality, *HUMIDITY control, *THERMAL conductivity
Abstract

Currently, the need to ensure adequate quality of air inside the living space but also the thermal efficiency of buildings is pressing. This paper presents the capacity of sheep wool heat-insulating mattresses to simultaneously provide these needs, cumulatively analyzing efficiency indicators for thermal insulation and indicators of improving air quality. Thus, the values obtained for the coefficient of thermal conductivity, and its resistance to heat transfer, demonstrate the suitability of their use for thermal insulation. The results of the permeability to water vapor characteristics on the sorption/desorption of water, air, demonstrate the ability to control the humidity of the indoor air and the results on the reduction of the concentration of formaldehyde, demonstrating their contribution to the growth of the quality of the air, and to reduce the risk of disease in the population. [ABSTRACT FROM AUTHOR]

Published
2021
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3. ASSESMENT OF THE BIO-ECO-INNOVATIVE PROPERTIES OF SHEEP WOOL BASED HEAT INSULATION MATERIALS .

Author

Grebenişan, Elvira, Ionescu, Brăduţ Alexandru, Toader, Tudor Panfil, Călătan, Gabriela, and Bulacu, Cezar

Subjects
*INSULATING materials, *WOOL, *THERMAL insulation, *NONRENEWABLE natural resources, *PLANT fibers, *INTERNATIONAL cooperation on climate change, *SHEEP, *ENERGY consumption
Abstract

The construction sector is one of the major consumers of non-renewable energy and natural resources, but also an important factor in increasing global warming and climate change by producing greenhouse gases. In Europe, around 30% of CO2 emissions and 36% of total greenhouse gases are a direct or indirect consequence of the construction sector. At EU level it is estimated that 40% of energy consumption is due to public / private sector buildings. All EU policies regarding climate, energy efficiency and the use of resources, and current strategies are focused on increasing the properties of the thermal insulation of the envelope, increasing the air-tightness and the use of mechanical ventilation with heat recovery, the improvement of the performance of the equipment, education and awareness-raising at the grassroots level are taken into account in the civil engineering field. Bio-eco-innovative thermal insulation mattresses obtained by recycling and reuse of post-industrial textile waste simultaneously with the use of natural vegetable fibers and sheep wool represent an ecological alternative to common thermal insulation materials that are already used in the construction industry. The aim of this paper is to present preliminary experimental research results regarding the mechanical properties of different thickness bio-eco-innovative mattresses and study their influence on the functionality of the non-woven heat-insulating product, for their intended use. Experimental results obtained on bio-eco-innovative thermal insulation mattresses show a good behaviour of the materials both in terms of mechanical properties, mold attack sensibility, worm and insect attack resistance and also to the biological attack of soil degree. [ABSTRACT FROM AUTHOR]

Published
2021
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4. Thermal Insulation Mattresses Based on Textile Waste and Recycled Plastic Waste Fibres, Integrating Natural Fibres of Vegetable or Animal Origin.

Author

Hegyi, Andreea, Vermeșan, Horațiu, Lăzărescu, Adrian-Victor, Petcu, Cristian, and Bulacu, Cezar

Subjects
*NATURAL fibers, *WASTE recycling, *PLASTIC recycling, *WOOL, *TEXTILE waste, *THERMAL insulation, *FIBERS, *PLASTIC scrap
Abstract

The current context provides, worldwide, the need to identify solutions for the thermal efficiency of constructions, through sustainable and innovative methods and products. A viable solution is to produce thermal insulating products by carding-folding technology, using natural fibres and recycled polyethylene terephthalate (rPET) and polyester (rPES) waste, converted to fibres. This paper presents experimental results obtained after testing several thermal insulation composite products produced using a mix of sheep wool, cellulose, rPET and rPES fibres. The results of the research demonstrate the thermal insulation properties but, at the same time, identify the benefits of using such materials on the quality of the air in the interior space (the ability to adjust humidity and reduce the concentration of harmful substances). At the same time, the advantages of using sheep wool composite mattresses concerning their resistance to insect attack is demonstrated when compared with ordinary thermal insulation materials. Finally, sensitivity elements of these composites are observed in terms of sensitivity to mould, and to contact with water or soil, drawing future research directions in the development of this type of materials. [ABSTRACT FROM AUTHOR]

Published
2022
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