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ORC-Based Geothermal Power Generation and CO2- Based EGS for Combined Green Power Generation and CO2 Sequestration

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ORC-Based Geothermal Power Generation and CO2- Based EGS for Combined Green Power Generation and CO2 Sequestration ( orc-based-geothermal-power-generation-and-co2--based-egs-com )

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304 New Developments in Renewable Energy nomically viable,leading to more widespread utilization of geothermal energy. The second part of this chapter will present and discuss the merits, limitations, environmental, econom‐ ic and fundamental aspects of CO2-based EGS technology. 2. ORC-based geothermal power generation 2.1. Developments & utilization of low-temperature geothermal energy resources for power generation The geothermal resources of the Earth are vast and abundant. For example, the part of geo‐ thermal energy stored at a depth of 3 km is estimated to be 43,000,000 EJ (equivalent to 1,194,444,444 TWh) which is much larger compared to all fossil fuel resources, whose energy equivalent is 36,373 EJ, combined (Chandrasekharam & Bundschuh, 2008). Conventional en‐ ergy resources, such as oil, natural gas, coal, and uranium, being widely consumed in the world, originate from finite energy sources embedded in the crust of the Earth. Only one en‐ ergy resource of the crust is renewable, namely geothermal energy. The word “geothermal” is originated from Greek words; “geo” meaning the Earth and “therme” meaning heat, so geothermal energy means the natural heat energy from the Earth. The source of geothermal energy is the continuous energy flux flowing from the interior of the Earth towards its sur‐ face. Unlike other conventional and renewable energy sources, geothermal energy has unique characteristics, namely it is abundantly available, stable at all times throughout the year, independent of weather conditions, and has an inherent storage capability (Hammons, 2004). Distinct from fossil-fuelled power generation, geothermal power generation is also considered to be a clean technology and environmentally friendly power source which could significantly contribute to the reduction of GHG emissions by replacing fossil fuels and other non-clean energy sourcesused for power generation (Chandrasekharam& Bund‐ schuh, 2008). Depending on the temperature and depth of the resource, the rock chemical composition and the abundance of ground water, geothermal heat energy resources vary widely from one location to another (Gupta & Roy, 2007). Geothermal heat sources are typically classified based on their available temperature, thus enthalpy energy level, from about 50 oC to 350 oC. The high-temperature (high-enthalpy) geothermal resources (with temperature > 200 oC) are typically found in volcanic regions and island chains, whereas the moderate-temperature (150-200 oC) and low-temperature (low-enthalpy) geothermal resources (<150 oC) are usually found broadly in most continental regions and by far the most commonly available heat re‐ source (Chandrasekharam& Bundschuh, 2008; Gupta & Roy, 2007). The increase in tempera‐ ture with depth in the Earth’s crust can be expressed in terms of what is known as the geothermal temperature gradient. Down to the depths accessible by drilling with modern technology (e.g. over 10 km), the average geothermal gradient is about 2.5-3.0 oC/100 m (Dickson& Fanelli, 2005). For example, at depth around 3 km below ground level, the tem‐ perature is about 90 oC. There are, however, areas in which the geothermal gradient is far from the average value (e.g. in some geothermal areas the gradient is ten times the average

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