Abstract
KeyWords: Organic Rankine Cycle(유기랭킨사이클), Scroll Expander(스크롤팽창기), Thermal Efficiency(열효율), Isentropic Efficiency(등엔트로피효율)초록: 본연구에서는소형저온유기랭킨사이클시스템의작동특성을파악하기위하여R-245fa를작동유체로사용한소형ORC 발전시스템을설계및제작하였고, 다양한저온의열원온도에대한실험적연구를수행하였다. 저온열원을모사하기위하여최고150 °C의물을공급할수있는110 kW급의전기저항히터를제작하였으며, 컨트롤러를통해서다양한열원온도및유량조건에대한실험이가능하도록구성하였다. 또한, 상용공기용스크롤압축기를이용하여팽창기로개조하고동력계및동기식모터와직접연결하였다. 로드뱅크및PI 제어방식을사용하여팽창기의회전속도에따른동일열원온도조건에대한실험을각각수행하였으며, 소형ORC 시스템의성능에영향을미치는다양한인자들에 대하여분석하고논의하였다.Abstract: Experiments were conducted to determine the operating characteristics of a small-scale ORC (organicRankine cycle) system for various low-temperature heat sources. A small-scale ORC power generation systemadopting R-245fa as a working fluid was designed and manufactured. Hot water was used as the heat source,and the temperature was controlled using 110-kW electric resistance heaters that provided temperatures of upto 150 °C. An open-drive oil-free scroll expander directly connected to a synchronous generator was installedin the ORC unit. Experiments were conducted by varying the rotational speed of the expander under thesame heat source temperature conditions. The factors that influence the performance of the small-scale ORCsystem were analyzed and discussed.
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