Energy balance of briquettes made of hemp (Cannabis sativa L.) cultivars (Ferimon, Bialobrzeskie) from autumn harvest to produce heat for household use
2013
Kolarikova, M., Czech Univ. of Life Sciences, Prague (Czech Republic). Faculty of Tropical AgriSciences | Ivanova, T., Czech Univ. of Life Sciences, Prague (Czech Republic). Faculty of Tropical AgriSciences | Havrland, B., Czech Univ. of Life Sciences, Prague (Czech Republic). Faculty of Tropical AgriSciences
Searching for renewable energy sources in the form of energy crops becomes a perspective solution for sustainable development of many countries. This paper discusses the energy balance and energy efficiency of briquettes made of different hemp (Cannabis sativa L.) cultivars. The hemp plants, the well-known variety of Polish origin Bialobrzeskie and the modern promising variety of French origin Ferimon, were experimentally cultivated and harvested. The objective was obtaining biomass for energy yield evaluation from its harvests and comparing differences between the cultivars. The harvest samples were subjected to experiments, during which the moisture content (MC) and gross calorific value (GCV) were measured, according to which the dry matter content (DM), biomass yield (BY) and net calorific value (NCV) were determined. An integral part of the energy balance determination was consideration and calculation of energy inputs the individual technological operations contribute to the overall sum of the consumed energy. The energy expenditures for hemp were calculated including direct energy inputs by fuels and human labour, and indirect energy inputs in fertilizers, seeds and energy embedded in machines. Regardless of the higher net energy yield for Ferimon cultivar compared with Bialobrzeskie, it was found that the difference between their Energy Return On Energy Invested (EROEI) is not significant.
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