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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Environmental and Regulatory Compliance | 5-10% | - Carbon footprint calculation - Energy reporting requirements - Sustainability reporting - EPA regulations (Clean Air Act, Clean Water Act) - Green building standards (LEED, ENERGY STAR) |
| Topic 2: Facilities Management | 8-12% | - Monitoring and targeting (M&T) - Building automation systems (BAS) - Preventive maintenance programs - Operations and maintenance best practices - Commissioning and re-commissioning |
| Topic 3: Electric Power Systems | 10-15% | - Standby power systems - Power distribution systems - Power factor correction - Harmonics and power quality - Motors and drives - Lighting systems and controls |
| Topic 4: Energy Auditing | 15-20% | - Metering and measurement equipment - Baseline establishment - Audit procedures and methodologies - Types of energy audits (preliminary, detailed, investment-grade) - Data collection and analysis - Audit report writing |
| Topic 5: Energy Project Implementation | 8-12% | - Implementation strategies - Project financing models - Energy service companies (ESCOs) - Measurement and verification (M&V) - Performance contracting (ESPC) - Project risk management |
| Topic 6: Heating, Ventilating, and Air Conditioning (HVAC) | 12-18% | - Heat transfer principles - Indoor air quality - Controls and optimization - Psychrometrics - Equipment efficiency ratings - HVAC system types and components - Load calculations |
| Topic 7: Renewable Energy Technologies | 8-12% | - Solar photovoltaic systems - Geothermal systems - Energy storage technologies - Solar thermal systems - Biomass and bioenergy - Wind energy systems |
| Topic 8: Building Envelope | 8-12% | - Insulation types and R-values - Windows and glazing systems - Thermal envelope analysis - Daylighting and shading - Air leakage and infiltration |
| Topic 9: Energy Accounting and Economics | 10-15% | - Energy price forecasting - Life cycle cost analysis (LCCA) - Energy cost accounting and allocation - Financial analysis techniques (ROI, NPV, IRR) - Utility rate structures and tariffs |
Constantly updated multiple mock exams with a great number of questions that will help you in better self-assessment. Memorize all your previous Certified Energy Manager (CEM) (CEM) exam questions attempts and display all the changes in your results at the end of each AEE CEM Practice Exam attempt. Users will be able to customize the CEM practice test software by time or question types. Supported on all Windows-based PCs.
NEW QUESTION # 139
A 1OO-kW packaged engine-generate combined heat and power (CHP) system has the specifications listed below. The CHP equipment operates fully loaded for 8.000 h/yr. What isthe annual fuel cost for the ChP equipment?
CMP equipment specifications: Electrical output 100kw Electrical efficiency: 25% Thermal recovery efficiency: 50*6 Total CMP efficiency: 75% Additional information: Fuel cost: S3.S0/GJ Electricity cost S0.06/kWh Previous water heating efficiency:
8046 Mot water usage: 75,700 liters/day (21 *C temperature rise)
[The question from the previous image, which was about calculating the annual cost of heat loss through a wall, but had a discrepancy between the calculated cost and the provided answer choices]
Answer: E
NEW QUESTION # 140
If installed without ancillary equipment, photovoltaic power cells generate what type of power?
Answer: A
NEW QUESTION # 141
Which of the advantages listed below, makes an ice TES system more preferred over a water TES system, when a load shifting strategy is considered?
Answer: A
Explanation:
To determine which advantage makes an ice Thermal Energy Storage (TES) system more preferred over a water TES system for a load shifting strategy, we need to evaluate each option based on the principles of thermal energy storage as outlined in the Association of Energy Engineers (AEE) Certified EnergyManager (CEM) training materials. Load shifting involves storing energy (cooling capacity) during off-peak periods and releasing it during peak demand, making storage efficiency and capacity critical. Let's analyze each option step-by-step.
Step 1: Understand Ice TES vs. Water TES in Load Shifting
* Ice TES: Uses the latent heat of fusion of water (ice melting) to store cooling energy. Ice is formed during off-peak hours (e.g., overnight) and melted during peak hours to provide cooling.
* Water TES: Uses the sensible heat capacity of water, storing chilled water (typically 4-6°C) to provide cooling.
* Load Shifting Goal: Maximize cooling storage in minimal space and cost, shifting electrical demand from peak to off-peak periods.
* CEM Reference: CEM materials in the "Thermal Energy Storage" section highlight ice TES for its high energy density and compact storage, contrasted with water TES for simpler operation but larger volume requirements.
Step 2: Evaluate Each Option
Option A: Ice-storage systems operate with a higher coefficient of performance (COP)
* Analysis:
* COP Definition: COP = (Cooling Output) / (Energy Input). For TES, this relates to the chiller's efficiency.
* Ice TES: Requires chillers to operate at lower temperatures (e.g., -5°C to 0°C) to freeze water, which typically reduces chiller COP (e.g., 3-4) compared to water TES chillers operating at 4-6° C (COP ~5-6).
* Reality: Ice TES systems often have a lower COP due to the additional energy needed for phase change, though total system efficiency may improve with load shifting benefits.
* CEM Reference: CEM notes that ice TES energy input is higher per unit of cooling due to lower evaporating temperatures, contradicting a "higher COP" claim.
* Conclusion: This statement is incorrect and not an advantage for ice TES in load shifting.
Option B: Ice-storage systems require smaller storage tanks since ice has a higher energy storage density
* Analysis:
* Energy Storage Density:
* Ice TES: Relies on latent heat of fusion = 334 kJ/kg (80 kcal/kg or ~144 Btu/lb). This is the energy absorbed/released when water freezes/melts, far exceeding sensible heat.
* Water TES: Relies on sensible heat = cp##T c_p \cdot \Delta T cp##T, where cp=4.18 kJ
/kg\cdotp°C c_p = 4.18 \, \text{kJ/kg °C} cp=4.18kJ/kg\cdotp°C (1 Btu/lb °F). For a typical #T=10°C\Delta T = 10°C#T=10°C (e.g., 4°C to 14°C), energy stored = 4.18×10=41.
8 kJ/kg 4.18 \times 10 = 41.8 \, \text{kJ/kg} 4.18×10=41.8kJ/kg (~20 Btu/lb).
* Comparison: Ice stores ~8 times more energy per kg than water for a 10°C range (334 vs.
41.8 kJ/kg).
* Volume Impact: Ice's density (~917 kg/m³) is slightly less than water (~1000 kg/m³), but the latent heat advantage dominates, reducing required tank volume significantly.
* Load Shifting: Smaller tanks mean less space and potentially lower capital costs, a key advantage for peak load management.
* CEM Reference: CEM training emphasizes ice TES's high energy density as a primary reason for its preference in space-constrained load shifting applications.
* Conclusion: This statement is correct and a clear advantage for ice TES.
Option C: Water-storage systems require smaller storage tanks since water has a higher density than ice
* Analysis:
* Density: Water = 1000 kg/m³; Ice = 917 kg/m³. Water is denser, but density alone doesn't determine storage size in TES.
* Energy Storage: As calculated, water's sensible heat capacity (e.g., 41.8 kJ/kg for 10°C) is much lower than ice's latent heat (334 kJ/kg). To store the same cooling capacity, water TES requires
~8 times more mass and thus larger tanks (even accounting for density differences).
* Implication: Water TES tanks are larger, not smaller, contradicting the statement.
* CEM Reference: CEM materials note water TES's larger volume requirements as a disadvantage compared to ice TES.
* Conclusion: This statement is incorrect and not an advantage for ice TES (it favors water TES incorrectly).
Option D: Ice-storage systems require lower maintenance due to lower pumping volume
* Analysis:
* Pumping Volume: Ice TES often uses glycol or brine solutions to transfer heat at lower temperatures, requiring pumps sized for smaller volumes due to concentrated coolingcapacity.
Water TES circulates larger volumes of chilled water. However, "lower pumping volume" doesn' t directly translate to "lower maintenance."
* Maintenance: Ice TES systems are more complex (ice-making equipment, heat exchangers), potentially increasing maintenance (e.g., defrost cycles, corrosion from brine). Water TES is simpler, often with lower maintenance needs.
* CEM Reference: CEM discusses ice TES complexity as a trade-off for its density advantage, not a maintenance benefit.
* Conclusion: This statement is questionable and not a primary advantage for load shifting.
Step 3: Identify the Key Advantage for Load Shifting
* Load Shifting Context: The goal is to store maximum cooling capacity efficiently during off-peak hours. Option B (smaller tanks due to higher energy storage density) directly supports this by reducing space and installation costs, a critical factor in TES design per CEM guidelines.
* Elimination:
* A: Incorrect (lower COP, not higher).
* C: Incorrect (water TES tanks are larger).
* D: Weak (maintenance isn't clearly lower; not the primary driver).
* B: Correct and relevant.
NEW QUESTION # 142
Which of the following statements best describe Demand Control Ventilation (DVC) in Building Automation Systems?
Answer: B
NEW QUESTION # 143
An energy project implemented today saves $10,000 per year for the next 20 years. Using the 5% interest table, determine the total value of savings at the end of the 20th year?
Answer: E
NEW QUESTION # 144
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