재생기를 적용한 지열 발전 사이클의 성능 해석

Abstract

The thermodynamic performance of geothermal power generation cycle with 1 kg/s geothermal water flow rate was evaluated to obtain the basic data for the optimal design of cycle. The basic thermodynamic model for cycle is Rankine cycle and the geothermal water and deep seawater was adapted for the heat source of evaporator and condenser, respectively. R-245fa is used as the working fluid. Net power showed the highest value when the evaporating pressure is around 300 kPa under given conditions. The cycle efficiency and net power increased when generator is added with 0.9 generator effectiveness. According to the increase of geothermal water temperature and decrease of cooling water temperature, the cycle efficiency increased. Especially, the net power showed higher values when deep seawater below 5℃ is used as a cooling water.