Exergoeconomic Evaluation and Optimization of Dual Pressure Organic Rankine Cycle (ORC) for Geothermal Heat Source Utilization  

作　　者：Dodeye Igbong Oku Nyong James Enyia Benjamin Oluwadare Mafel Obhua Dodeye Igbong;Oku Nyong;James Enyia;Benjamin Oluwadare;Mafel Obhua(Department of Mechanical Engineering, Cross River University of Technology, Calabar, Nigeria;Department of Mechanical Engineering, Ekiti State University, Ado Ekiti, Nigeria;Department of Mechanical Engineering, Nigeria Maritime University, Okerenkoko, Nigeria)

机构地区：[1]Department of Mechanical Engineering, Cross River University of Technology, Calabar, Nigeria [2]Department of Mechanical Engineering, Ekiti State University, Ado Ekiti, Nigeria [3]Department of Mechanical Engineering, Nigeria Maritime University, Okerenkoko, Nigeria

出　　处：《Journal of Power and Energy Engineering》2021年第9期19-40,共22页电力能源（英文）

摘　　要：In the present study, a dual-pressure organic Rankine cycle (DORC) driven by geothermal hot water for electricity production is developed, investigated and optimized from the energy, exergy and exergoeconomic viewpoint. A parametric study is conducted to determine the effect of high-stage pressure<span><span><span style="font-family:;" "=""><span></span><span><span> </span>and low-stage pressure</span><span></span><span><span> </span>variation on the system thermodynamic and exergoeconomic performance. The DORC is further optimized to obtain maximum exergy efficiency optimized design (EEOD case) and minimum product cost</span></span></span></span><span><span><span style="font-family:;" "=""> </span></span></span><span><span><span style="font-family:;" "="">optimized design (PCOD case). The exergy efficiency and unit cost of power produced for the optimization of EEOD case and PCOD case are 33.03% and 3.059 cent/kWh, which are 0.3% and 17.4% improvement over base case, respectively. The PCOD case proved to be the best, with respect to minimum unit cost of power produced and net power output over the base case and EEOD case.In the present study, a dual-pressure organic Rankine cycle (DORC) driven by geothermal hot water for electricity production is developed, investigated and optimized from the energy, exergy and exergoeconomic viewpoint. A parametric study is conducted to determine the effect of high-stage pressure<span><span><span style="font-family:;" "=""><span></span><span><span> </span>and low-stage pressure</span><span></span><span><span> </span>variation on the system thermodynamic and exergoeconomic performance. The DORC is further optimized to obtain maximum exergy efficiency optimized design (EEOD case) and minimum product cost</span></span></span></span><span><span><span style="font-family:;" "=""> </span></span></span><span><span><span style="font-family:;" "="">optimized design (PCOD case). The exergy efficiency and unit cost of power produced for the optimization of EEOD case and PCOD case are 33.03% and 3.059 cent/kWh, which are 0.3% and 17.4% improvement over base case, respectively. The PCOD case proved to be the best, with respect to minimum unit cost of power produced and net power output over the base case and EEOD case.

关 键 词：Geothermal Water Dual Pressure Organic Rankine Cycle Exergoeconomic Factor OPTIMIZATION 

分 类 号：G63[文化科学—教育学]