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Table 1 Parameters characterization for the reference model (Equation 3 )

From: A simplified model for the estimation of life-cycle greenhouse gas emissions of enhanced geothermal systems

Symbol Parameter Value range Unit Probability distribution in the value range Main references
z Borehole depth 2,000 to 6,000 m Equiprobability Current EGS projectsa, Genter et al. (2010), Frick et al. (2010), Bauer et al. (2008)
f Produced flow rate 25 to 100 kg/s Equiprobability Current EGS projectsa, Frick et al. (2010)
Nw Number of wells 2 to 3 Adimensional Equiprobability Current EGS projectsa, Huenges (2010), Bauer et al. (2008), Schmidt et al. (2010)
d Fuel for drilling 3,000 to 7,000 MJ/m Equiprobability Drilling reports from Soultz-sous-Forêtsb, Bauer et al. (2008), Frick et al. (2010)
LF Load factor 0.85 to 0.95 Adimensional Equiprobability Lund (2003), Huenges (2010), Platt et al. (2012)
LT Lifetime 20 to 40 years Normal distribution centered on LT = 30 years with σ = 3.25 Frick et al. (2010), Platt et al.(2012), Bauer et al. (2008), Huenges (2010)
SFe Scaling factor enhancement 0.5 to 10 Adimensional Lognormal distribution with σ = 1, μ = 0 and peak on SFe = 1 Schindler et al. (2010), Hettkamp et al. (2004), Nami et al. (2008), Graff and Baujard (personal communication)
P p Specific power of pumps 3.6 to 8.6 kW/(kg/s) Equiprobability Frick et al. (2010), Lacirignola and Blanc (2013), Graff and Baujard (personal communication)
P ORC Installed capacity ORC 1,250 to 3,500 kW Equiprobability Current EGS projectsa, Huenges (2010), Bauer et al. (2008)
  1. aCurrent EGS projects taken into account in this study (see also Additional file 1 section 2): Soultz-sous-Forêts (France): Genter (2011), LabEx G-EAU-THERMIE PROFONDE (2013); Landau (Germany): Hettkamp et al. (2011), Frey and Milles (2007); Rittershoffen (France): Perret (2011), Schmittbuhl (2013); Insheim (Germany): Baumgärtner (2011), Bestec (2012). bDrilling reports from Soultz-sous-Forets power plant: G.E.I.E. Exploitation Minière de la Chaleur (2002), Southern International Inc (2002), Gandy Inc (2004a, 2004b).