ISTRAŽIVANJE MIKRO-TRIGENERACIONIH SISTEMA ZASNOVANIH NA OBNOVLJIVIM IZVORIMA ENERGIJE RESEARCH OF MICRO-TRIGENERATION SYSTEMS BASED ON RENEWABLE ENERGY SOURCES) Marko Mančić 1 , Dragoljub Živković 1 , Velimir Stefanović 1 , Milena Todorović 1 1 University of Niš, Mechanical Engineering Faculty, Aleksandra Medvedeva 14, 18000 Niš, Srbija E-mail: markomancic@yahoo.com Rezime: Mikro-trigeneraicioni sistemi su sistemi malih snaga za kombinovanu proizvodnju električne, toplotne, rashladne energije. Struktura ovakvog postrojenja zavisi od raspoloživosti lokalnih resursa i lokalnih energetskih potreba. U ovom radu su prikazani rezultati simulacije različitih konfiguracija mikro trigeneracionih sistema, zasnovanih na primeni obnovljivih izvora energije, i to: solarne energije, geotermalne energije i biomase. Simulacije su izvršene primenom programa TRNSYS. Dimenzionisanje sistema je vršeno na osnovu potreba manjeg stambenog objekta. Nakon sinteze osnovne strukture sistema, izvršene su simulacije godišnje proizvodnje električne, toplotne i rashladne enrgije primenom solarnih toplotnih prijemnika, foto-naponskih prijemnika, toplotne pumpe, motora sa unutrašnjim sagorevanjem i toplovodnog kotla. Analiza dobijenih rezultata pokazuje prednosti i mane upotrebe pojedinih tehnologija i izvora energije za formiranje mikro-trigeneracionog sistema i ukazuje na ogranicenja upotrebe obnovljivih izvora energije za potrebe stambenih objekata Ključne reči: mikro trigeneracija, simulacija godišnjih performansi, obnovljivi izvori energije Abstract: Micro-trigeneration systems are small plants for production of heating, cooling and electricity. The structure of such a plant depends on availability of local energy sources and on- site energy demands. In this paper, results of simulations of various possible configurations of micro-trigeneration are on systems, based on renewable energy sources, i.e. solar energy, geothermal energy and biomass, are presented. Simulations are performed using TRNSYS software. System sizing is done based on energy demands of a small residential building. After the basic structure of feasible trigeneration systems was determined, simulations of annual production of heating, cooling and electricity, using solar thermal collectors, photo-voltaic, heat pump, internal combustion engine and hot water boiler, is performed. Analysis of obtained results implies positive and negative aspects of using each of the technologies as part of a micro-trigeneration system and determines boundaries for using renewable energy sources in small residential buildings. Key words: micro-trigeneration, annual performance simulation, renewable energy sources 1. INTRODUCTION Trigeneration represents a process of energy conversion for combined heating, cooling and electricity production. Application of trigeneration systems provides possibilities for significant overall energy efficiency improvement and reductions of green house gas emissions [1,2]. Trigeneration plants are complex energy systems which take advantages of combined energy production technologies [3]. Application of an energy system depends on real local