Hrčka, Richard, 1974- The influence of selected modifying temperatures on spruce wood emissivity / Richard Hrčka. -- Obr., tab. -- Lit. - The precise and accurate result of the measurement of wood temperature using pyrometer requires the setting of the emissivity of the object. The lack of the information about wood emissivity supports the aim of this contribution. The method of the wood emissivity measurement is based on determining the surface temperature and computing the solution of heat conduction equation. The particular integral is found using the radiative boundary condition. Spruce wood is the second most abundant tree species in Slovakia with a wide use for example in constructions or pulp and paper industry. Adding heat at the modifying temperatures observed from 160°C to 220°C applying for four hours significantly influences the spruce wood thermal properties measured at standard temperature. Mass specific heat capacity and thermal conductivity in tangential direction of spruce wood showed continuous decreasing character with increasing values of the modifying temperatures. Emissivity showed more constant character. Its value significantly differs only in the case of treated wood 𝜀𝜖〈0.74±0.09;0.79±0.13 〉compared to untreated wood 𝜀=0.85±0.04. Thermal diffusivity isthe most stable property among the wood thermal properties.

In Acta Facultatis Xylologiae Zvolen : vedecký časopis Drevárskej fakulty. -- Zvolen : Technická univerzita vo Zvolene, 2020. -- ISSN 1336-3824. -- Vol. 62, no. 2 (2020), s. 19-25

I. Acta Facultatis Xylologiae Zvolen : vedecký časopis Drevárskej fakulty. -- Vol. 62, no. 2 (2020), s. 19-25

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