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This kind of polished approach is beneficial for a commendable grade in the Certified Energy Manager (CEM) (CEM) exam. While attempting the exam, take heed of the clock ticking, so that you manage the AEE CEM questions in a time-efficient way. Even if you are completely sure of the correct answer to a question, first eliminate the incorrect ones, so that you may prevent blunders due to human error.
| Section | Weight | Objectives |
|---|---|---|
| Measurement and Verification | 5% | - Baseline development and savings calculation - M&V protocols and standards |
| Energy Audits and Instrumentation | 10% | - Data collection and analysis - Measurement tools and instrumentation - Audit levels and methodologies - Energy performance indicators |
| Operations, Maintenance and Commissioning | 5% | - Commissioning and retro-commissioning - Maintenance best practices |
| Codes, Standards and Regulations | 5% | - Compliance and reporting requirements - Sustainability policies and frameworks - Energy efficiency codes and standards |
| Energy Storage Systems | 3–5 | - Storage technologies and applications - Integration and benefits |
| HVAC Systems and Building Envelope | 15% | - Heating, ventilation and air conditioning - Thermal envelope performance - Load calculation and system selection |
| Electrical Power Systems and Motors | 15% | - Motor systems, efficiency and controls - Power distribution and quality - Power factor correction and load management |
| Boiler and Steam Systems | 4–6 | - Operation and efficiency - Maintenance and optimization |
| Energy Savings Performance Contracting | 5% | - Guaranteed savings and risk allocation - Contract structures and financing |
| Energy Accounting and Economics | 15% | - Time value of money, NPV, IRR, payback analysis - Life cycle costing and economic analysis - Utility rate structures and tariffs - Energy units and conversions |
| Distributed Generation and Renewable Energy | 4–6 | - Combined heat and power (CHP) - Solar, wind, biomass, geothermal - Grid integration and economics |
| Industrial Systems | 6–8 | - Compressed air, pumping, and drying systems - Process energy efficiency |
| Lighting Systems | 10% | - Daylighting integration - Lighting technologies and efficiency - Design and control strategies |
| Building Automation and Controls | 5% | - Automation and optimization - Building management systems - Control systems and strategies |
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NEW QUESTION # 124
In a chilled water thermal energy storage system, chilled water is stored at 4°C and used for supply water.
Chilled water return is 14°C. Calculate the storage capacity required to hold 50 GJ of thermal cooling. (The specific heat of water (C) is 4.2 kJ/kg-°C. Assume no system losses.)
Answer: E
NEW QUESTION # 125
A heat pump water heater has an annual average coefficient of performance (COP) of 2.1 and heats water from 15°C to 50°C. Hot water use is 100 liters per day, 365 days/yr. The electricity cost is $0.10/kWh. What is the annual water heating cost? (The specific heat of water (C) is 4.2 kJ/kg-°C.)
Answer: B
NEW QUESTION # 126
If outside air has a temperature of 25°C dry bulb and 15°C wet bulb, what is the enthalpy of the air?
Answer: D
NEW QUESTION # 127
How does an enthalpy-based economizer control operate?
Answer: C
NEW QUESTION # 128
A compressed air system has a total volume of 247,500 liters. During a 30-minute break in production (air compressor system turned off and no production demand for compressed air), the system pressure drops from
7 bar, gauge (700 kPa, gauge) to 5 bar, gauge (500 kPa, gauge). Calculate the leakage rate in the compressed air system.
Answer: D
NEW QUESTION # 129
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