Exergy

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Figure 2: Variable phase turbine blades in comparison with normal turbine blades. Source: GRC Transactions, Vol. 33, 2009. 4 In comparison of a real geothermal project using R134a as a variable phase cycle and an ORC based geothermal plant, it was concluded that the overall cost including the power cycle can be brought down from 4000$/kWe in ORC based technology to 3000$/kWe in variable phase power cycle. 3 Nano‐structured metal‐organic heat carriers can also be used to enhance the ORC overall performance and reduce the ORC cost. US Department of Energy’s Pacific Northwest National Laboratory (PNNL) is one of players in research and developments on the issue. A new project on low temperature geothermal based power generation is under investigation by the aforementioned institute.5 Nano‐structured metal‐organic heat carriers are Biphasic fluids with rapid expansion and contraction capabilities. When they get heat, the thermal‐cycling of the biphasic fluid will run a turbine to produce electricity. Due to their features and better heat delivery from heat source, they can produce more power in ORC unit and they can increase the power generation capacity to near that of a conventional steam cycle. By applying them cost per produced unit of electricity can be reduced. Their development is under study and it is hoped that they will be more known and applied in near future (Phil Welch, Patrick Boyle, 2009). 4 4 Phil Welch, Patrick Boyle; available at: http://www.energent.net/documents/Geothermal_Resources_Council_2009_Paper.pdf; available at: 5 Nathanael Baker; available at: http://www.energyboom.com/category/tags/mohcs; as accessed: 01.06.2010. 6

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