AEE Certified Energy Manager (CEM) case studies
AEE Certified Energy Manager (CEM) · Put your knowledge to work in context.
The Certified Energy Manager (CEM®) is a professional credential awarded by the Association of Energy Engineers to individuals who can demonstrate broad, practical knowledge of energy management. It is aimed at engineers, facility and plant managers, energy consultants, commissioning and sustainability staff, and others accountable for reducing energy use and cost in commercial, institutional, and industrial facilities. The AEE Certified Energy Manager (CEM) case studies are 5 cases and about 5,077 words.
1Rewind or Replace? A Twice-Rewound 200 hp Pump Motor with Current Unbalance
A wastewater plant's 200 hp, 480 V, 1,780 rpm TEFC motor drives a centrifugal pump 6,000 h/yr. Nameplate efficiency is 95.0% at full load.
960 words, about 5 min2Low Delta-T Syndrome on a 400-Ton Plant: The Wrong 100 Tons to Add
A 400-ton chilled-water plant serves three air handlers through a variable-flow secondary loop. Design is 44°F supply, 58°F return, 14°F delta-T.
880 words, about 4 min3Option C Savings Claim Confounded by a New Tenant and a Server Room
An energy savings performance contract covers a chiller replacement, VFDs on two 50 hp supply fans, and an EMS upgrade in a 220,000 ft² office building. The contract uses IPMVP Option C with a 12-month baseline and a 3-year term.
958 words, about 5 min4A VAV Building Running 24/7: Overrides, No Static Reset, and a Failed Airflow Sensor
A 14-AHU, VAV office building has 25 hp supply fans, each drawing 18.5 kW at 60 Hz. Trend data for a mild October week shows every AHU running 24/7 against a 6 a.m.–6 p.m.
1,096 words, about 5 min5Sizing and Dispatching a 6,000 Ton-Hour Thermal Storage Tank
A university chilled-water plant has two 1,000-ton constant-speed centrifugal chillers at 0.60 kW/ton including auxiliaries. The design-day load is 2,000 tons between noon and 6 p.m.
1,183 words, about 6 min