Exergy based fluid selection for a geothermal Organic Rankine Cycle for combined heat and power generation

Modeling and optimization of a binary geothermal power plant

“…Heberle et al [13] have studied η I and η II of a binary geothermal ORC with a recuperator with different WFs in the case of T min =15 , P max ≤ 0.9P c assuming constant isentropic efficiency for both turbine and pump. They have concluded that when η I is the figure of merit, Isobutane and R245fa are the most suitable WFs for T GB max ≤167 and T GB max >167 , respectively; when η II is the figure of merit, two regions are specified.…”

“…The characteristics of a thermal energy source affects the optimal choice of working fluid (WF) for an ORC (e.g. [10][11][12][13][14][15][16][17][18][19][20]). Different objective functions have been used for WF selection, such as the ratio of net power output to heat exchanger area (Ẇ net /A) [10], net power output (Ẇ net ) [14,19,21,22] and first or second law efficiencies [7, 11-13, 16-18, 20].…”

Environomic optimal configurations of geothermal energy conversion systems: Application to the future construction of Enhanced Geothermal Systems in Switzerland

“…Important aspects to be accounted for are the geothermal resources characteristics Franco and Vaccaro (2012), the design of the conversion cycle, which has to be optimized to maximize its efficiency Franco and Vaccaro (2012); Franco and Villani (2009); Hettiarachchi et al (2007), the choice of the working fluid for binary cycles Saleh et al (2007); Heberle and Brüggemann (2010); Guo et al (2011a,b), and the district heating parameters for CHP applications Guo et al (2011a,b). The thermodynamic performance is as well critical to ensure an efficient use of the resource, and it can be assessed using the exergy efficiency DiPippo (2004); Kanoglu and Dincer (2009);Coskun et al (2011);Ganjehsarabi et al (2011).…”

A comparison of advanced heat recovery power cycles in a combined cycle for large ships

“…The main reasons for this seems to be the very high conversion efficiencies combined with a relative process simplicity, low cost, scalability and versatility. A key to the above properties of the ORC is the use of alternative working fluids, and thus the selection of optimum working fluid has received a lot of attention in the literature [20][21][22][23][24][25].…”