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← ScienceWhich mechanism limits energy extraction during geothermal steam phase transitions?
A)Condensation reduces turbine vacuum
B)Superheating increases turbine erosion
C)Non-condensables diminish vapor pressure✓
D)Scaling impedes heat flux
💡 Explanation
Non-condensable gases reduce the partial pressure of steam, thereby lowering the overall vapor pressure during phase transition because, the steam turbine's efficiency is directly related to the vapor pressure. Therefore, total extractable energy declines, rather than alternatives where pure steam transitions prevail.
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