Assessment & Monitoring Methods Flashcards
7 cards from real EMP practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Assessment & Monitoring Methods flashcards as text
Which metering configuration allows a facility to separately track energy consumption for individual production lines or departments?
Answer: Sub-metering
Sub-metering installs meters downstream of the main utility meter to isolate and track energy use by specific end-uses, departments, or equipment.
In an energy audit, what does the term 'baseline normalization' primarily address?
Answer: Adjusting energy data to account for variable conditions like weather or production
Baseline normalization adjusts historical energy data for independent variables (weather, occupancy, production volume) so that true energy performance changes can be isolated.
A power quality analyzer detects a power factor of 0.72 at a manufacturing plant. What is the most likely corrective measure an energy manager would recommend?
Answer: Add power factor correction capacitors
Power factor correction capacitors supply reactive power locally, reducing the reactive component of current and improving power factor toward unity.
What is the primary purpose of a continuous commissioning (CC) program in a building?
Answer: To optimize and maintain building system performance through ongoing monitoring and adjustments
Continuous commissioning uses ongoing data collection and analysis to identify and correct building system inefficiencies, maintaining peak performance over time.
Which statistical method is most appropriate for developing an energy prediction model when multiple independent variables (production, weather, shifts) affect consumption?
Answer: Multiple linear regression
Multiple linear regression models the relationship between energy consumption and several independent variables simultaneously, providing a more accurate predictive baseline.
During a walk-through energy audit, an auditor notices motors running at full speed despite variable load requirements. Which monitoring approach would best quantify the energy savings potential?
Answer: Short-term logging of motor current and speed across operational cycles
Short-term data logging of motor current and speed captures actual load profiles across varying operating conditions, enabling accurate energy savings calculations for VFD installation.
What does a 'degree-day' measurement capture for use in energy monitoring?
Answer: The difference between the mean daily outdoor temperature and a reference base temperature
A degree-day quantifies the deviation of the mean outdoor temperature from a base temperature (typically 65°F), used to normalize heating and cooling energy consumption for weather differences.