Comparative exergoeconomic and exergoenvironmental analysis of an ejector enhanced flash-binary geothermal system using various organic working fluids

This article proposes and analyses a new modified flash-binary geothermal power system with ejector enhanced dual-pressure evaporation organic Rankine cycle using six organic working fluids including R۶۰۰a, R۶۰۰, R۶۰۱a, R۶۰۱, R۱۲۳۴ze(E), and R۲۴۵fa. Exergoeconomic and exergoenvironmental concepts are used to analyse the system. The major design parameters are considered to assess the cost and environmental impact performances of the system. Parametric assessment indicates that turbine back pressure (P۳) has the highest positive effect on the csystem among the other parameters for all fluids especially for R۲۴۵ within ۹۱.۲۳%. Furthermore, the highest positive effect on the bsystem belongs to high-pressure turbine inlet pressure (P۱۹) for R۶۰۱a within ۲۴.۲۸%. On the other hand, Pump۲ outlet pressure (P۱۳) has the negative effect on the bsystem and csystem for all fluids.

Keywords:

Geothermal energy , exergoeconomic , exergoenvironmental , ejector