Wyniki wyszukiwania - BazTech

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Wood fibreboard paraffin hydrophobization and the impact of this treatment on the board surface finishing quality

Kudela Josef

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

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2019

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No. 107

115--123

EN

Wood fibreboard paraffin hydrophobization and the impact of this treatment on the board surface finishing quality. The aim of this paper is to analyse the causes of surface treatment defects in commercially produced wood fibreboards (FB). The analysis of: the obtained (measured and calculated) thermodynamic characteristics and of the results of microscopic examinations demonstrated that the excessive FB hydrophobization with paraffin may cause the paraffin to release from the FB surface and to migrate into the first primer layer. For the sanded FBs, similar paraffin migration was also observed into the second primer layer. This entailed lowered drying rate for the coating materials applied on FB, lower adhesion of the coating materials to the substrate and also lower adhesion between the particular coating layers applied. At the same time, the occurring frequency of surface treatment defects increased.

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Thermodynamic Characteristics of Solid

Pluta Z., Hryniewicz T.

International Letters of Chemistry, Physics and Astronomy

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2013

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Vol. 2

60-71

EN

The paper is to present the developed thermodynamic characteristics of a solid. The existent description of dependence of temperature on the proper entropy (thermal capacitance) was used as the beginning point of the considerations. A critical evaluation of the picture of that dependence was a consecutive link of the considerations. Furthermore, an adequate description of the discussed heat phenomenon, taking into account the detailed characteristics of the entropy growth characteristics, has been presented. This characteristics indicates a clear quantum character of the studied reality, reflected by the potentials, proper and gained, respectively. These magnitudes are the measures of the proper and gained specific energies of this thermodynamic factor. The dependence of temperature on the specific energy has been described to formulate a formula on the heat work. At the end the dependence between the specific heat and the entropy constant is derived. In conclusion, a quantum nature of macroscopic reality has been noticed together with the definition of the heat energy notion. The necessity of noticing the description of any other reality in this scale has been indicated.

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The Influence Of Some Selected Parameters On The Thermodynamic Characteristics Of A Chp Plant With A Gas Turbine

Kotowicz J., Chmielniak T.

Journal of Polish CIMAC

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2007

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Vol. 2, no 1

255-263

EN

The paper presents ways of determining the thermodynamic characteristics of a CHP plant with a gas turbine. Special attention has been paid to the average annual efficiency of transforming the chemical energy of fuel into electricity and heat (the so-called Energy Utility Factor – EUF) and Primary Energy Savings (PES). Two different systems were analyzed, viz. the installation of a gas turbine with a waste-heat boiler and a heat and power generating plant. Concerning the former one the influence of the parameters of steam (temperature and pressure) generated in the waste-heat boiler on the values of PES and EUF was determined. Concerning the latter one, the methods of investigating the effect of the thermal power of heat exchangers on the characteristics have been presented. This will facilitate the proper choice of heat exchangers.