CPM Energy Management & Utilities 2 — Questions and Answers
Question 1: What is 'demand response' in the context of industrial energy management?
- Responding to customer demand for energy-efficient products
- Voluntarily reducing power consumption during peak grid periods in exchange for incentives (Correct answer)
- Automatically increasing production during off-peak energy hours
- A utility program that installs smart meters at no cost to the customer
Correct answer: Voluntarily reducing power consumption during peak grid periods in exchange for incentives
Demand response programs incentivize industrial customers to reduce or shift electricity use during peak grid periods, helping grid stability while lowering the plant's energy costs.
Question 2: Compressed air systems in manufacturing are noted for being energy-inefficient because:
- They require expensive rare-earth materials to manufacture compressors
- Only 10–30% of electrical input energy is converted to useful pneumatic work (Correct answer)
- They are exempt from power factor correction requirements
- They operate exclusively on three-phase power, which is inefficient
Correct answer: Only 10–30% of electrical input energy is converted to useful pneumatic work
Compressed air is one of the most expensive plant utilities; only 10–30% of electrical input is converted to useful work, with the remainder lost as heat during compression.
Question 3: The primary advantage of a combined heat and power (CHP) system over separate heat and power generation is:
- Lower capital cost than conventional boiler systems
- Overall system efficiency of 70–90% by utilizing waste heat from power generation (Correct answer)
- Complete elimination of all greenhouse gas emissions
- Compatibility with all existing electrical systems without any modification
Correct answer: Overall system efficiency of 70–90% by utilizing waste heat from power generation
CHP achieves 70–90% overall efficiency by capturing and using heat that would otherwise be wasted, compared to the ~30–50% efficiency of conventional power generation alone.
Question 4: An energy balance analysis for a manufacturing process is primarily used to:
- Calculate monthly utility bill projections
- Identify all energy inputs, outputs, and losses to prioritize improvement opportunities (Correct answer)
- Determine equipment depreciation schedules for tax purposes
- Set individual employee energy-saving performance targets
Correct answer: Identify all energy inputs, outputs, and losses to prioritize improvement opportunities
An energy balance maps all energy inputs against useful outputs and losses, applying conservation-of-energy principles to quantify waste and identify the highest-impact opportunities.
Question 5: Which lighting technology offers the best combination of energy efficiency and longest service life for industrial facilities?
- High-intensity discharge (HID) metal halide
- T8 fluorescent with electronic ballasts
- LED (Light Emitting Diode) fixtures (Correct answer)
- High-pressure sodium vapor
Correct answer: LED (Light Emitting Diode) fixtures
LED fixtures deliver 50–80% energy savings versus HID or fluorescent lighting, with lifespans of 50,000–100,000 hours, reducing both energy and maintenance costs substantially.
Question 6: Energy sub-metering within a plant is primarily used to:
- Replace the main utility meter for billing purposes
- Identify energy consumption by individual process, department, or equipment (Correct answer)
- Automatically reduce peak demand by shedding loads
- Monitor employee compliance with energy-saving policies
Correct answer: Identify energy consumption by individual process, department, or equipment
Sub-metering breaks down total facility energy consumption to the equipment or department level, enabling identification of high-use areas and precise measurement of conservation project results.
Question 7: On-bill financing (or 'pay-as-you-save') programs for energy efficiency projects primarily address:
- Utility rate negotiation strategy
- The upfront capital cost barrier for energy efficiency improvements (Correct answer)
- Carbon tax and regulatory compliance obligations
- Employee incentive programs for voluntary conservation
Correct answer: The upfront capital cost barrier for energy efficiency improvements
On-bill financing lets facilities implement energy upgrades without upfront capital by repaying costs through utility bill savings over time, removing the primary barrier to adoption.
CPM Energy Management & Utilities 2
What is 'demand response' in the context of industrial energy management?