Daugavpils Universitātes 55.Starptautiskās ... - DU conference

clones were received from the Coordination Centre of the ICP Vegetation, Bangor (UK). Theexperiments were performed at five meteorological stations (Rūjiena, Zosēni, Dobele, Mērsrags andRucava) located in rural areas of different climatic regions of Latvia.In 2012 we took part in the experiment with ozone-sensitive (S156) and ozone-resistant (R123)genotypes of snap bean (Phaseolus vulgaris L.). Bean seeds and experimental protocol was suplied byProgramme Coordination Centre to participiants across Europe.Bioindicator plants were grown fromJune to the end of September at two rural sites - Rucava (meteorological station) and Taurene (nearestmeteorological station Zosēni) located in different climatic regions of the country.Visible injury was observed on both species of ozone-sensitive plants at all experimental sites,nevertheless concentration of ground level ozone was comparatively low. Resistant plants didn't showany signs of damage. When compare the species tested for the bioindication of ozone it should beconcluded that white clover is better for several reasons. White clover is more resistant to the latespring and early autumn frosts, because it can be exposed for longer period of time. White clover isalso not subjected to damage of insects, snails, and birds, sometimes causing loss of experimentalplants.Tatjana OdiĦecaRiga Technical University, KaĜėu street 1, Riga, Latvia, tatjana.odineca@rtu.lvFUEL CHOICE FOR CHP PLANTS USING RES:THE MEANING OF A REGIONAL FACTORTo reach the long-term goals of Energy Politics of Latvia, as EU member country, it is solved to use thepotential of cogeneration and to stimulate the development of CHP plants using renewable sources ofenergy (RES).One of the most important advantages of CHP is a possibility of usage of different local energyresources for energy producing. Latvia has a characteristic centralized power supply system, whichmeans inhabited areas have sufficiently high heat loads to accommodate installation of an efficientcogeneration facility. Sustainable Energy Community Model adopted for Latvian circumstancesallows to analyze all types of energy resources and other factors of examined region, to work out theplan of region’s energy development (both short-term (2-3 years) and long term (till 2020)) andmanagement of its realization.SEB model applying includes deep examination of local renewable energy sources, especially theanalysis of biomass receiving potential and biomass production possibility. While units of woodchipsproduction are situated in all Latvian territory with quite regular intervals and good system of roadscan provide the delivery of wood fuel to all Latvian regions, biomass is a fuel which needs to be usedpossibly closer to the place of its producing. Potential of biomass production depends on fertility ofthe earth, which considerably varies in different regions, therefore costs of biomass receiving aredifferent as well.Costs of fuel component (gas produced of biomass) necessary for establishment of CHP plant can bedesignated as I bm = I ∑ – I st, where I ∑– total costs of CHP plant (including producing of biogas); I st –costs of plant technological equipment. I bm includes the full volume of agricultural works (sowing andharvesting, amortization of agricultural machinery, etc.) The lower is the fertility of earth, the biggerarea of earth is necessary for cultivation of biomass. Costs of earth processing can be accepted equal indifferent regions, though in fact in less fertile regions these costs can be higher.There is observed practical example of calculation of biomass costs for CHP plant. The costs ofbiomass producing make the big part of the total costs of fuel for CHP plant and price of producedenergy. In the example there were calculated the costs of biomass producing in fertile region and inregion with 50% less fertile earth. The costs of biomass in less fertile region are 42% higher incomparison with costs of biomass cultivated in fertile earth.Accepting that there is no big difference between chosen technologies of CHP plants (from the pointof efficiency), choice of fuel can change because of difference of biomass costs. The researchdemonstrates the meaning of regional factor while estimating possibilities of biomass usage in CHPplants.~ 48 ~