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Energy Efficiency Survey Aboard USS Princeton CG-59

AUTHOR: Lotspeich, Chris; Lovins, Amory
YEAR: 2001
DOCUMENT TYPE: Report or White Paper

This report describes the findings and recommendations of RMI’s unclassified survey of energy efficiency potential of the USS Princeton CG-59. Energy efficiency seeks to deliver the same service with less fuel and uncompromised or improved warfighting capability via improved technologies or operational practices. RMI’s reconnaissance focused on hotel loads in cruise condition, and excluded radars, weapons, and C3I systems. This report is intended not as a definitive analysis, but to indicate areas for further investigation in new ships. It finds potential savings much larger than those the Navy has achieved or expects. The cruise-condition electric load is 2 MW in a brief observation, but may be 50+% larger under the range of seasons and conditions. The potential for reducing it is about 20–50%, much of it retrofittable. This could reduce fuel use by up to 10–25%, depending sensitively on improving turbine operating modes and efficiencies. The largest electric savings would be realized in motors, pumps, fans, chillers, and lighting. If the identified electrical savings were combined with potential improvements (not examined in detail) in electrical generation and in propulsion, Princeton’s total fuel use could probably be reduced by about 50% with modest effort, or by roughly 75% with more intensive effort.