Abstract
Abstract A series of numerical simulation has been carried out to study thermo-hydraulic characteristics of a primary surfacetype heat exchanger, which is designed for the evaporator and condenser of a geothermal ORC. Working fluid is geothermalwater at hot side and R-245fa, which is a refrigerant designed for ORC, at cold side. Amplitude ratio of the channel andReynolds number are considered as design parameters. Nusselt number is presented for the Reynolds number ranging from50 to 150 and compared to analytic solutions. The result shows that higher amplitude ratio channel gives better heat transferperformance within the range of investigation. Key words ORC(유기랭킨사이클), Primary surface heat exchanger(주전열면 열교환기), Amplitude ratio(채널주름비), Friction factor(마찰계수), Nu(누셀트수)†Corresponding author, E-mail: jahn@kookmin.ac.kr 기호설명 A ： 채널진폭 [m] C p ： 비열 [J/kg-K] D h ： 수력직경 [m] f ： 마찰계수 H ： 채널높이 [m] h ： 대류열전달계수 [W/m 2 -K] k ： 열전도율 [W/m-k] L ： 채널길이 [m] ： 질량유량 [kg/s] Nu ： Nusselt 수∆ ： 압력강하 [Pa] q
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