Density and porosity of the cut and ground material of energy plants. The work aimed at determination of bulk and specifi c density and porosity for the three energy plant species: rose (Rosa multifl ora), giant miscanthus (Miscanthus sinensis gigantean) and Virginia mallow (Sida hermaphrodita). The differences in bulk and specifi c density and porosity are the species features of energy plants and result from the method for material fragmentation. The bulk density of cut material was by 17% higher than that of the ground material, and for the rose (240 kg/m3) by over 3.5 times higher than for the miscanthus and the Virginia mallow; these values for the latter created a homogeneous group (68 kg/m3). The specifi c plant material density of Virginia mallow, rose and miscanthus, designed for briquette production, amounted to 1207, 1162 and 640 kg/m3, respectively. The cut material porosity depended on the energy plant species and method for its fragmentation, as well as on dimensions and shape of the particles.
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