Over the last decade, the production and consumption of biofuels increased rapidly worldwide, in ... more Over the last decade, the production and consumption of biofuels increased rapidly worldwide, in an attempt to reduce GHG (greenhouse gas) emissions, diversify transportation fuels, promote renewable energy, and create or maintain employment, especially in rural areas and developing countries. Although policy instruments being currently implemented in industrialized regions focus on sustainable biofuels, the definition and assessment of sustainability remains
The statistic indicates the energy consumption in food industry: to produce 1 J of food energy 10... more The statistic indicates the energy consumption in food industry: to produce 1 J of food energy 10 J of primary energy is required. The population growth and its food supplying are causing the annual energy consumption rise on 24 – 40%. On the other hand it leads to fast deterioration of surrounding environment owing to CO2, NOx, SOx, dust, soot and other industrial emissions. The steep rise of energy prices in recent years, as well as the necessity to curb carbon dioxide emissions, have intensified the need for solutions that are increasing energy efficiency in the food industry. This paper deals with selection of optimum amount heat to be recovered during Total Site integration and utility targets for external heating, cooling, refrigerating etc. The methodology provides the calculation of minimum capital investment during heat integration of site. The results may be used for minimisation of investments during Site retrofit. Acknowledgement. The financial support by the EC and Croa...
NATO Science for Peace and Security Series C: Environmental Security, 2010
ABSTRACT In this paper integration of wind power generation into the Croatian electricity supply ... more ABSTRACT In this paper integration of wind power generation into the Croatian electricity supply is analysed using available technologies. The starting point is a model of the energy system in Croatia in 2007. Comprehensive hour-by-hour energy system analyses are conducted of a complete system meeting electricity, heat and transport demands, and including renewable energy, power plants, and combined heat and power production (CHP) for district heating. Using the 2007 energy system the wind power share is increased by two energy storage options: Pumped hydro and heat pumps in combination with heat storages. The results show that such options can enable an increased penetration of wind power. Using pumped hydro storage (PHS) may increase wind power penetration from 0.5 TWh, for existing PHS installations and up to 6 TWh for very large installations. Using large heat pumps and heat storages in combination with specific regulation of power system could additionally increase wind penetration for 0.37 TWh. Hence, with the current technologies installed in the Croatian energy system the installed pumped hydro-plant may facilitate more than 10% wind power in the electricity system. Large-scale integration of wind power in the Croatian energy systems requires new technologies in other parts of the energy system. KeywordsRenewable energy sources-penetration-wind energy-pumped hydro-heat pumps
Over the last decade, the production and consumption of biofuels increased rapidly worldwide, in ... more Over the last decade, the production and consumption of biofuels increased rapidly worldwide, in an attempt to reduce GHG (greenhouse gas) emissions, diversify transportation fuels, promote renewable energy, and create or maintain employment, especially in rural areas and developing countries. Although policy instruments being currently implemented in industrialized regions focus on sustainable biofuels, the definition and assessment of sustainability remains
The statistic indicates the energy consumption in food industry: to produce 1 J of food energy 10... more The statistic indicates the energy consumption in food industry: to produce 1 J of food energy 10 J of primary energy is required. The population growth and its food supplying are causing the annual energy consumption rise on 24 – 40%. On the other hand it leads to fast deterioration of surrounding environment owing to CO2, NOx, SOx, dust, soot and other industrial emissions. The steep rise of energy prices in recent years, as well as the necessity to curb carbon dioxide emissions, have intensified the need for solutions that are increasing energy efficiency in the food industry. This paper deals with selection of optimum amount heat to be recovered during Total Site integration and utility targets for external heating, cooling, refrigerating etc. The methodology provides the calculation of minimum capital investment during heat integration of site. The results may be used for minimisation of investments during Site retrofit. Acknowledgement. The financial support by the EC and Croa...
NATO Science for Peace and Security Series C: Environmental Security, 2010
ABSTRACT In this paper integration of wind power generation into the Croatian electricity supply ... more ABSTRACT In this paper integration of wind power generation into the Croatian electricity supply is analysed using available technologies. The starting point is a model of the energy system in Croatia in 2007. Comprehensive hour-by-hour energy system analyses are conducted of a complete system meeting electricity, heat and transport demands, and including renewable energy, power plants, and combined heat and power production (CHP) for district heating. Using the 2007 energy system the wind power share is increased by two energy storage options: Pumped hydro and heat pumps in combination with heat storages. The results show that such options can enable an increased penetration of wind power. Using pumped hydro storage (PHS) may increase wind power penetration from 0.5 TWh, for existing PHS installations and up to 6 TWh for very large installations. Using large heat pumps and heat storages in combination with specific regulation of power system could additionally increase wind penetration for 0.37 TWh. Hence, with the current technologies installed in the Croatian energy system the installed pumped hydro-plant may facilitate more than 10% wind power in the electricity system. Large-scale integration of wind power in the Croatian energy systems requires new technologies in other parts of the energy system. KeywordsRenewable energy sources-penetration-wind energy-pumped hydro-heat pumps
Uploads
Papers by Neven Duic