Abstract. Biofuels are more and more popular energy source and they are used in more households in the Eastern Europe region. Straw from the agriculture crops is promising and significant biomass source of energy but now it is at least energy utilized. In terms of straw burning is the most important feature of its quick and easy volatilization. Another property, which is negative, is its low ash fusion temperature. The straw ash begin soften at about 830 °C. However, at the temperature 850 °C to 900 °C the ash transform to glass slags and sinters which damage the refractory of the furnace and it is also difficult to remove. The paper deals about the option for reducing the problems of low ash fusion temperature by additives application. The presented results are from the lime application in the laboratory conditions and in the real conditions, in the heat source with the nominal thermal power 2 MW. The results of the experiments showed that the results from the real operation does not correspond with laboratory results.

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The fireplace combustion of wood is a significant and largely unregulated source of emission pollution. Therefore article deals about experimental measurements of emission parameters from combustion of biomass in small heat sources. The objectives of the present work are to analyse basic pollutants arising from the combustion process and to define measurement technique applied to characterise particle emissions from biomass combustion. Gravimetric methods are among the most accurate and precise methods of quantitative analysis and therefore was selected for measurement of solid emissions. Conclusion of work focus on evaluation of the tests results, especially concentration of particulate matter (PM) from the combustion of briquettes made from different kinds of biomass. During the combustion of certain briquettes was recorded a high amount of particulate matter and analyser switched to “stand by” mode in several cases. The results indicate that higher concentration of PM was determined in the case of briquettes made from phytomass in comparison to briquettes made of woody biomass.

Abstract. The article deals with the utilizing of solar energy by the means of concentric trough collector based on own design. It focuses on achieving optimal position of the trough with respect to incident radiation during its operation. Due to the collector virtual sun tracking system, which was proved to be ineffective and could not achieve the desired results, the optimum position had to be maintained by manual control of rotation. The measurement of the angle of rotation of the concentric trough is realized using the ARDUINO electronic platform, for which the program was created in the software ARDUINO (IDE) 1.8.4.