TITLE:
Exergoeconomic Evaluation and Optimization of Dual Pressure Organic Rankine Cycle (ORC) for Geothermal Heat Source Utilization
AUTHORS:
Dodeye Igbong, Oku Nyong, James Enyia, Benjamin Oluwadare, Mafel Obhua
KEYWORDS:
Geothermal Water, Dual Pressure Organic Rankine Cycle, Exergoeconomic Factor, Optimization
JOURNAL NAME:
Journal of Power and Energy Engineering,
Vol.9 No.9,
September
30,
2021
ABSTRACT: 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 and low-stage pressure 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 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.