Faculty of Mechanical Engineering

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Author: search.filters.author.Lazova, ElenaLanguage: search.filters.language.English

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    OPTIMAL ENERGY MIX FOR ASMALL-SCALE DISTRICT HEATING SYSTEM IN R. N. MACEDONIA
    (University of Niš, Faculty of Mechanical Engineering, 2023)
    Lazova, Elena
    ;
    The European Union aims to be an economy with zero greenhouse gas emissions by 2050. The integration of renewable energy sources (RES) into district heating systems (DHSs) is an ongoing process. With the localization of CO2 emissions, DHS allow easy control of the environmental impact. The integration of heating systems into a common source, i.e. connection to DHSs, enables the diversification of heat sources, which contributes to increased independency and reliability of the system's functioning, as well as optimizing the production price of heat. The purpose of this paper is to develop and simulate small district heating system with a heat demand of 7490MWh and a peak of 3470kW for the City of Ohrid, with optimal RES share in order to minimize production costs for heat. Several scenarios-systems are modeled and analyzed: solar thermal system, natural gas-fueled combined heat and power plant, photovoltaic plant, heat pumps and seasonal heat storage tank. Optimization of the considered system aims to be competitive to the existing individual heating systems.
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    ASSESMENT OF THE MACEDONIAN POWER SYSTEM POTENTIAL TOWARD GREEN ENERGY TRANSITION
    (University POLITEHNICA Timisoara, Faculty of Engineering Hunedoara, 2023-05)
    Lazova, Elena
    ;
    This paper presents original analysis of Macedonian energy sector. The options for installing RES capacities are investigated by using the EnergyPLAN software. Analysis was conducted for base scenario and two renewable scenarios designed for achieving a sustainable future with lower CO2 emissions, higher level of RES share, import independence and lower LCOE prices. The results have shown that achieving these goals is possible in the two renewable scenarios. The electricity production from RES is increased from 22.2% in Scenario 1 to 86% in Scenario 2 and 110% in Scenario 3. The annual CO2 emissions will decrease from 3.04Mt/annual in Scenario 1 to 0.67Mt/annual and 0.41Mt/annual in the second and third scenarios, respectively. This paper also analyzes how the change of CO2 prices can affect the LCOE. The LCOE increases by 103.8% in Scenario 1 when CO2 price increases from 20 to 100eur/t while in the third scenario increases by only 8.16% because of the low CO2 emissions. This shows how the renewable scenarios can be almost independent and predictable in terms of CO2 emissions and costs.