AEE Certified Energy Auditor case studies
AEE Certified Energy Auditor · Put your knowledge to work in context.
The Certified Energy Auditor (CEA) is a professional credential awarded by the Association of Energy Engineers (AEE), positioned by AEE as "The Leading Global Certification for Energy Auditing." It is aimed at practitioners who evaluate and analyze energy use in a facility, identify energy conservation opportunities, and recommend where consumption can be reduced or optimized - practicing energy auditors who want to validate their experience, consultants specializing in efficiency upgrades to buildings and building systems, and auditors working in government buildings who must follow the U.S. Department of Energy's Guide to Energy Audits. The AEE Certified Energy Auditor case studies are 5 cases and about 4,060 words.
1Three Weeks, One Meter: Scoping a Level 2 Audit with a 46% Base Load
A 14,000 m² site (5,000 m² office, 9,000 m² light assembly) built in 1978 consumes 2,100 MWh of electricity and 3,600 MWh of natural gas per year, with a 480 kW peak demand. There is no sub-metering, the BAS retains only 30 days of trend data, and five years of monthly utility bills are available.
828 words, about 4 min2Specific Consumption Rose 5% - Is the Plant Really Degraded?
A food-processing plant supplies 24 months of monthly electricity and production data. Year over year, output fell from 1,340 t to 1,205 t per month while electricity fell from 705,000 kWh to 668,000 kWh, so specific consumption rose from 526 to 554 kWh/t (+5.3%).
773 words, about 4 min3Five Measures, $500,000, and a Five-Year Payback Rule
The plant has 500,000 of capital available this year and a 12% real discount rate. Five measures are on the table: (A) LED and lighting controls, 180,000, 60,000/yr, 10-year life; (B) compressed-air leak repair and master controls, 90,000, 45,000/yr, 7-year life; (C) boiler plant replacement with condensing boilers, 320,000, 55,000/yr, 20-year life; (D) VSDs on four AHU supply fans, 70,000, 22,000/yr, 15-year life; (E) roof insulation, 150,000, 12,000/yr, 25-year life.
793 words, about 4 min4Perimeter Overheating: Second Chiller or Broken Economizer?
A 1,800 m² two-storey office (1998) has one VAV air handler served by a 60 kW air-cooled chiller. South and west perimeter zones overheat from March to May and again in October while interior zones are comfortable, and the chiller runs on many mild days.
844 words, about 4 min5A 90 kW VSD Proposal on a Leaky, Load/Unload System
A plant has two 75 kW oil-free screw compressors rated 11.0 m³/min at 7.5 bar; one runs as lead in load/unload and the other is standby. Measured at the lead compressor: 62 kW loaded, 18 kW unloaded, with a cycle of 52 s loaded and 9 s unloaded during production.
822 words, about 4 min