Research in Agricultural Engineering, 2014 (vol. 60), issue 2
Technical possibilities of the cutting oils filtration residues combustionOriginal Paper
M. Pešek, M. Přikryl
Res. Agr. Eng., 2014, 60(2):45-49 | DOI: 10.17221/33/2010-RAE 
The value of consumption share of electricity from renewable sources in the Czech Republic up to 8% in 2010 stems from an individual obligation adopted by the Czech Republic when signing the Kyoto Protocol of the United Nations Framework Convention on Climate Change. One of the possibilities how to reduce greenhouse gases emissions from fossil fuels consists in biomass burning. Biomass used for power purposes is obtained on purpose as a result of production activities or it originates from utilization of wastes from agricultural, forest and industrial production. In biomass burning, the boiler used produces carbon dioxide, recyclable in nature. Increase...
Use of waste material mixtures for energy purposes in small combustion devicesOriginal Paper
J. Malaťák, J. Bradna
Res. Agr. Eng., 2014, 60(2):50-59 | DOI: 10.17221/78/2012-RAE
The article assesses the energy use of solid biofuels (wheat and rape straw) and their blends with suitable additives (cocoa husks, brown coal and coal sludge). The elemental and stoichiometric analysis evaluates their suitability for energy recovery. Furthermore, thermal emission characteristics in automatic hot water boiler VERNER A251 are observed. The results of thermal emission measurements show that all samples meet the requirements of the Directive No. 13/2006 for carbon monoxide (2,000 mg/m3). The average nitrogen oxides emission concentrations exceed emission limits compared with the Directive No. 13/2006 (250 mg/m3)...
Evaluation of the influence of fermentation input substrates preparation on biogas production intensityOriginal Paper
D. Sochr, R. Adamovský, J. Kára, I. Hanzlíková
Res. Agr. Eng., 2014, 60(2):60-67 | DOI: 10.17221/72/2012-RAE
The article is aimed at verification of the effect of chaff length of fermented material and duration time of the contact of material with oxygen before dosing into the fermenter, on production and energy content of biogas. The results of the verification showed an effect of chaff length in the fermented material on production and energy content of the biogas at processing grass silage with high content of dry-matter and especially maize silage. When processing maize silage, optimal length of chaff in terms of production and energy content of biogas was 13 mm, with grass silage it was from 69 to 112 mm. Verification of the influence of time of grass...
Deformation energy of Jatropha curcas L. seeds under compression loadingOriginal Paper
A. Kabutey, D. Herák, O. Dajbych, M. Divišová, W.E. Boatri, R. Sigalingging
Res. Agr. Eng., 2014, 60(2):68-74 | DOI: 10.17221/15/2012-RAE
The present research is a follow-up of the previous studies on mechanical behaviour of Jatropha curcas L. seeds under compression loading. The research describes in detail the deformation energy which was determined from the area under the force-deformation curve. The compression device ZDM 50-2313/56/18 with a chart recorder and pressing vessel of diameter 76 mm were used to record the force-deformation functions of varying moisture content between 8.46% and 36.50% w.b. of Jatropha curcas L. seeds. Under the force-deformation curve, three main descriptions namely the increasing function (smooth curve), wave-effect characteristics...
Moisture-dependent physical properties of kokum seed (Garcinia indica Choisy)Original Paper
S.P. Sonawane, G.P. Sharma, N.J.Thakor, R.C. Verma
Res. Agr. Eng., 2014, 60(2):75-82 | DOI: 10.17221/59/2011-RAE
Designing the equipment for processing, sorting and sizing of agricultural crops requires information about the crops' physical properties. The physical properties of kokum seed were evaluated as a function of moisture content in the range of 7.35 to 25.79% d.b. (dry basis). The average length, width, thickness and one thousand seed mass were 17.17 mm, 10.66 mm, 5.87 mm and 410 g, respectively, at a moisture content of 7.35% d.b. The average value of geometric mean diameter and sphericity were 10.19 mm and 59.75%, respectively, at moisture content of 7.35% d.b. As the moisture content increased from 7.35 to 25.79% d.b., the bulk density increased from...