The results are reported of energy- and exergy-based comparisons of coal-fired and nuclear electrical generating stations. Overall energy and exergy efficiencies, respectively, are 37% and 36% for the coal-fired process, and 30% and 30% for the nuclear process. Energy losses associated with emissions (mainly with spent cooling water) account for all of the energy losses, while emission-related exergy losses account for approximately 10% of the exergy losses. The remaining exergy losses are associated with internal consumptions, mainly in components which generate heat by combustion or nuclear reactions, and in components which transfer heat across large temperature differences.
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