{"query_echo":{"q":"","filters":{"analysis_type":["energy audit"]},"warnings":[{"code":"facet_value_not_in_vocabulary","message":"Value 'energy audit' for facet 'analysis_type' is not in the controlled vocabulary."}]},"total":{"value":1,"relation":"eq"},"page":1,"page_size":20,"self":"https://climateinsightsdirectory.org/api/v1/search?analysis_type=energy+audit","stability":"beta","ai_marking":{"digital_source_type":{"uri":"http://cv.iptc.org/newscodes/digitalsourcetype/trainedAlgorithmicMedia","name":"Created using Generative AI"},"notice":"Summary and key insights are generated using artificial intelligence."},"results":[{"id":"rmi-001094","url":"https://climateinsightsdirectory.org/document/rmi-001094","title":"Energy Efficiency Survey Aboard USS Princeton CG-59","publisher":{"name":"RMI","organization":"rmi"},"document_type":"report","language":"en","date_published":"2001-06-30","source_url":"https://rmi.org/app/uploads/2017/06/RMI_Energy_Efficiency_Survey_Aboard_2001.pdf","generator":"Climate Insights Directory","generated_fields":["summary","key_insights","climate_tags","geography_discussed","analysis_type"],"summary":{"text":"The report finds that the USS Princeton's cruise-condition electric load of 2 MW could be reduced by 20–50%, potentially lowering total fuel use by 10–25%. The most significant savings are identified in motors, pumps, fans, chillers, and lighting. A critical finding is that current operational practices—specifically running two gas turbine generators (GTGs) in parallel at partial loads—negate approximately 75–80% of the fuel savings that would otherwise result from electrical load reductions. The report recommends transitioning to single GTG operation during routine cruise conditions, implementing Variable-Speed Drives (VSDs), and adopting premium-efficiency equipment. More intensive strategies, including the use of fuel-cell generators and low-speed electric propulsion, could potentially reduce total fuel use by roughly 75%.","ai_generated":true,"unit":"rmi-001094#summary","date_modified":"2026-10-23"},"key_insights":[{"text":"The cruise-condition electric load of the USS Princeton was observed at 2 MW, with a potential for reduction of 20\u001050%, which could decrease fuel use by 10\u001025%.","ai_generated":true,"unit":"rmi-001094#insight-1","date_modified":"2026-10-23"},{"text":"Current operational practices of running two gas turbine generators (GTGs) in parallel at partial loads significantly diminish the fuel savings gained from reducing electrical loads; approximately 75\u001080% of potential fuel savings are lost unless this practice is changed.","ai_generated":true,"unit":"rmi-001094#insight-2","date_modified":"2026-10-23"},{"text":"Operating a single GTG instead of two during routine cruise conditions could reduce total fuel use by an estimated 14%.","ai_generated":true,"unit":"rmi-001094#insight-3","date_modified":"2026-10-23"},{"text":"Combining single GTG operation with a 20% reduction in electrical load could result in an 18% saving in total fuel use.","ai_generated":true,"unit":"rmi-001094#insight-4","date_modified":"2026-10-23"},{"text":"The most aggressive efficiency strategy, combining a 50% electric load reduction with fuel-cell generation and low-speed electric propulsion, could reduce total fuel use by approximately 76%.","ai_generated":true,"unit":"rmi-001094#insight-5","date_modified":"2026-10-23"},{"text":"The ship's fire pumps are identified as a major source of waste, consuming approximately 210 kW of electricity to maintain pressure by continuously pumping seawater overboard.","ai_generated":true,"unit":"rmi-001094#insight-6","date_modified":"2026-10-23"},{"text":"The existing centrifugal chillers are described as among the most inefficient evaluated by the team, with an observed performance of 1.1 kW/ton compared to a best-practice benchmark of 0.45 kW/ton.","ai_generated":true,"unit":"rmi-001094#insight-7","date_modified":"2026-10-23"},{"text":"Lighting loads could be reduced by approximately 40% through the use of T8 lamps, electronic ballasts, and improved lighting design, which would also reduce the associated HVAC cooling load.","ai_generated":true,"unit":"rmi-001094#insight-8","date_modified":"2026-10-23"},{"text":"The report recommends the installation of Variable-Speed Drives (VSDs) on all variable loads, including pumps and fans, to avoid the inefficiency of throttling or bypassing flow.","ai_generated":true,"unit":"rmi-001094#insight-9","date_modified":"2026-10-23"},{"text":"The ship's power factor is nominally 0.8, which is suboptimal; increasing it toward 1.0 would reduce distribution-system losses and increase distribution capacity by 20%.","ai_generated":true,"unit":"rmi-001094#insight-10","date_modified":"2026-10-23"},{"text":"The use of ozone in laundry systems could reduce total water use by approximately 25% and decrease hot water requirements by at least 90%.","ai_generated":true,"unit":"rmi-001094#insight-11","date_modified":"2026-10-23"}],"climate_tags":["energy efficiency","fuel consumption","heating, ventilation, and air conditioning","water conservation","fuel cell","waste heat recovery"],"geography_discussed":["United States"],"frame_perspective":[],"analysis_type":["energy audit","technical assessment","operational analysis"]}]}