Experimental Investigation of Organic Rankine Cycle (ORC) for Low Temperature Geothermal Fluid: Effect of Pump Rotation and R-134 Working Fluid in Scroll-Expander  

作　　者：Nugroho Agung Pambudi Santiko Wibowo Ranto Lip Huat Saw 

机构地区：[1]Energy and Society Laboratory,Mechanical Engineering Education,Universitas Sebelas Maret,Surakarta,57126,Indonesia [2]Lee Kong Chian Faculty of Engineering and Science,UTAR,Kajang,43000,Malaysia

出　　处：《Energy Engineering》2021年第5期1565-1576,共12页能源工程（英文）

基　　金：gratitude to LPPM UNS,for funding this research project titled“Increasing the Capacity of Geothermal Power Plants Using Exergy Analysis to Support Government Policy in the Development of a 35 Thousand MW Power Plant(Hibah Penelitian Unggulan UNS(PU-UNS))”.

摘　　要：Organic Rankine Cycle(ORC)is one of the solutions to utilize a low temperature geothermal fluid for power generation.The ORC system can be placed at the exit of the separator to extract energy from brine.Furthermore,one of the main components of the system and very important is the pump.Therefore,in this research,the pump rotation is examined to investigate the effect on power output and energy efficiency for low temperature geothermal fluid.The rotation is determined by using an inverter with the following frequencies:7.5,10,12.5,15 and 17.5 Hz,respectively.R-134 working fluid is employed with 373.15 K evaporator temperature in relation to the low temperature of the geothermal fluid.Furthermore,the condenser temperature and fluid pressure were set up to 293.15 K and 5×10^(5) Pa,respectively.This research uses a DC generator with a maximum power of 750 Watt and the piping system is made from copper alloy C12200 ASTM B280 with size 1.905×10^(−2) m and a thickness of 8×10^(−4) m.The results showed that there is an increase in mass flow rate,enthalpy and generator power output along with increasing pump rotation.In addition,it showed that the maximum generator output power was 377.31 Watt at the highest pump rotation with a frequency of 17.5 Hz.

关 键 词：Organic Rankine Cycle(ORC) GEOTHERMAL energy PUMP R-134A energy efficiency 

分 类 号：TG1[金属学及工艺—金属学]