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1

Thermal emissivity of tent fabric and its influence on the thermal insulation of tent walls

Ujma Adam, Jura Jakub

Budownictwo o Zoptymalizowanym Potencjale Energetycznym

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2021

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Vol. 10 Nr 2

15--22

EN

The article presents research aimed at determining the thermal properties of tent fabric and, as the final result, the value of the heat transfer coefficient of the thermal protection of a pneumatic tent. It was assumed that the thermal insulation capacity of the tent cover, consisting of two fabric layers separated by an air gap, was determined for two seasons, summer and winter. The tested material had two sides that differed in color, which resulted in obtaining a different value of the thermal emissivity coefficient. The thermal conductivity coefficient of the tent fabric was also measured with the use of a lammeter. The obtained data from the measurements were then used to determine the resistance to heat transfer on the tent surfaces, the thermal resistance of the partition, and finally the value of the heat transfer coefficient.

2

Study on fireproof textile heat resistance improvement with TiSi(N) nanocomposite coating of various thicknesses

Stankiewicz M., Miedzińska D., Marszałek K.

Composites Theory and Practice

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2018

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R. 18, nr 2

110--114

EN

Fireproof textiles must exhibit high heat resistance. Many methods to improve this property are known. They can be achieved, for example, using special chemical additives during fiber production. In the paper the use of a nanocomposite layer is proposed. NATAN and PROTON fireproof textiles were coated with a TiSi(N) nanocomposite layer using magnetron sputtering technology. Three layer thicknesses of 200, 300 and 400 nm were applied. The thermal barrier effect for heating up to 100 and 330°C was studied on specially designed testing equipment. The influence of the layer thickness on the textile heat resistance was visible at 100°C. For the thickest layer a worse effect was observed, which could be caused by the thermal conductivity of the composite layer. However, the proposed layer raised the heat resistance of the textiles.

PL

Tkaniny ognioodporne muszą charakteryzować się wysoką odpornością cieplną. Znanych jest wiele metod ulepszania tej właściwości. Można ją uzyskać na przykład za pomocą specjalnych dodatków chemicznych stosowanych podczas produkcji włókien. W artykule zaproponowano zastosowanie warstwy nanokompozytowej. Tkaniny ognioochronne NATAN i PROTON zostały pokryte warstwą nanokompozytową TiSi(N) przy użyciu technologii rozpylania magnetronowego. Zastosowano trzy warstwy o grubości 200, 300 i 400 nm. Efekt barierowości termicznej dla ogrzewania do 100 i 330°C został zbadany na specjalnie zaprojektowanym stanowisku eksperymentalnym. Wpływ grubości warstwy na odporność cieplną badanych materiałów był widoczny w 100°C. Dla najgrubszej warstwy zaobserwowano gorszy efekt, co może być spowodowane przewodnością cieplną warstwy kompozytowej. Jednak proponowana warstwa pozwoliła na zwiększenie wytrzymałości cieplnej tekstyliów.

3

Evaluation of Heat Capacity and Resistance to Cyclic Oxidation of Nickel Superalloys

Przeliorz R., Binczyk F., Gradoń P., Góral M., Mikuszewski T.

Archives of Foundry Engineering

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2014

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Vol. 14, iss. 3

67--70

EN

Paper presents the results of evaluation of heat resistance and specific heat capacity of MAR-M-200, MAR-M-247 and Rene 80 nickel superalloys. Heat resistance was evaluated using cyclic method. Every cycle included heating in 1100°C for 23 hours and cooling for 1hour in air. Microstructure of the scale was observed using electron microscope. Specific heat capacity was measured using DSC calorimeter. It was found that under conditions of cyclically changing temperature alloy MAR-M-247 exhibits highest heat resistance. Formed oxide scale is heterophasic mixture of alloying elements, under which an internal oxidation zone was present. MAR-M-200 alloy has higher specific heat capacity compared to MAR-M-247. For tested alloys in the temperature range from 550°C to 800°C precipitation processes (γ′, γ′′) are probably occurring, resulting in a sudden increase in the observed heat capacity.