CA CEG case studies
CA CEG · Put your knowledge to work in context.
The Certified Energy Manager (CEM) is a professional credential for people who plan, justify, and run energy-management programs in buildings and industrial plants. Candidates typically come from facilities engineering, energy services, consulting, utility programs, and sustainability roles, and many hold engineering or technical backgrounds. The CA CEG case studies are 5 cases and about 2,385 words.
1Compressed Air Retrofit Screening Under a Capital Cap
A mid-size metal fabricator runs three 250-hp lubricated rotary screw compressors: two modulate continuously at 78% average capacity and one runs as trim at 40%. Plant pressure is held at 110 psig because one die-casting cell requires it, though 90% of the plant can run at 85 psig.
541 words, about 3 min2Chiller Plant Retrofit Economics with Escalating Rates
A 180,000 ft² office tower has two 500-ton centrifugal chillers, one of which is 22 years old and uses R-11. The older chiller runs as lead because of a control quirk, consuming 0.72 kW/ton at design versus 0.55 for the newer unit.
489 words, about 2 min3Envelope and HVAC Interaction in a Humid Climate Retrofit
A 1970s elementary school in a hot-humid climate has single-pane aluminum windows, an uninsulated masonry wall (U-0.35), and a roof with R-11 batt (U-0.07). Outside air is 95°F/78°F WB in summer; indoor setpoint is 75°F/50% RH.
471 words, about 2 min4Power Factor, Harmonics, and Motor Replacement Trade-off
A plastics extruder plant has a 1,200 kVA transformer at 85% loading, a billed power factor of 0.82, and 9/kVA-month demand charges with a 0.90 PF penalty threshold. The plant added 40 VFDs over three years.
438 words, about 2 min5Steam Trap Failure and Condensate Strategy in a Food Plant
A food processing plant has a 40,000 lb/h gas-fired boiler at 80% efficiency producing 100 psig saturated steam. A trap survey of 220 traps found 26 failed open and 9 failed closed.
446 words, about 2 min