태양열 발전시스템의 다양한 유기물을 적용한 랭킨사이클의 해석적 연구

Abstract

After Industrial Revolution, consumed energy per person has been gradually increased and fossil fuel consumption has been increased due to the rapid technology development. In those reasons, occurrence of abnormal climate as Elnino and Raninyo was continuously increased. Many of studies tell it is owing to the rise of atmosphere temperature by global warming. For reasons, the energy development and researches about alternative energy source which can replace fossil fuel have been accelerated. Especially, the interesting of renewable energy as alternative energy has increased suddenly. Solar energy among renewable energy is pollution free energy. Besides, it has a lot of advantages that it is possible to obtain the highest energy per unit area and the geographical distribution of energy source more equal than fossil fuel. Solar collecting system is heat energy transition or storage through absorption of radiation energy from solar. Organic Rankine Cycle(ORC) is a power generating system using low temperature heat source(60℃~200℃) that is unsuitable for steam generation. However, it is enough to operate ORC cycle because the organic refrigerant has low boiling temperature. Thus, ORC has an advantage that it is possible to generate power using low temperature by using some working fluid like Freon or hydrocarbon type refrigerant. In this study, the performance of organic Rankine cycle in which R-245fa and R-134a is used and a power generation system coalesce with solar energy is analyzed under Gwangju climate condition. As a result, the maximum and minimum collected heat of solar collector was 20.4 kW and 13.6 kW at October and December, respectively. Besides, the highest generator power was generated at October and it was 0.91 kW/day, while the lowest generator power is occurred at December and it was about 0.85 kW/day. As well the performance of ORC with a scroll and twin screw expander which connects to solar collector system was analyzed according to the average annual solar radiation and outdoor temperature in Gwang-ju, Korea. Through this study, it can be presented the basic analytical data for system optimization a performance characteristics according to operating conditions. The result shows that the twin screw expander showed 4.8 kW/day under the low solar radiation and 5.8 kw/day under the high radiation conditions. Besides, the efficiency of scroll expander with R-245fa showed approximately 8% higher than that of twin screw expander.