CEM Floor Plan Development 5 — Questions and Answers
Question 1: An energy manager is evaluating floor plans for a retrofit project. What does 'as-built' documentation mean in this context?
- The original design drawings submitted for permit approval
- Floor plans reflecting actual constructed conditions, including all field changes from design drawings (Correct answer)
- Preliminary concept sketches used for energy feasibility studies
- CAD models generated from energy simulation software outputs
Correct answer: Floor plans reflecting actual constructed conditions, including all field changes from design drawings
As-built drawings document the building as it was actually constructed, capturing field modifications that may differ significantly from original design documents.
Question 2: A floor plan shows that a school building has classrooms on the south facade and a gymnasium on the north end. How does this layout affect energy management strategy?
- The gymnasium should be scheduled identically to classrooms for uniform HVAC operation
- Classrooms benefit from passive solar daylighting while the gymnasium requires separate high-ventilation HVAC zoning (Correct answer)
- North-facing gymnasium walls have higher solar heat gain than south-facing classroom walls
- Classrooms should be equipped with higher ventilation rates than the gymnasium per ASHRAE 62.1
Correct answer: Classrooms benefit from passive solar daylighting while the gymnasium requires separate high-ventilation HVAC zoning
South classrooms benefit from daylighting and passive solar, while gymnasiums have unique high-occupancy, high-ventilation needs requiring separate zone control.
Question 3: In energy auditing, what is the purpose of calculating 'energy use intensity' (EUI) normalized by floor plan area?
- To determine the maximum allowable equipment plug load per space
- To enable benchmarking of energy performance across buildings of different sizes (Correct answer)
- To calculate the required insulation R-value for each floor assembly
- To establish HVAC equipment sizing based on occupancy density
Correct answer: To enable benchmarking of energy performance across buildings of different sizes
EUI (kBtu/ft²/year) normalizes total energy use by floor area, allowing fair comparison of buildings with different sizes against each other or against benchmarks.
Question 4: A floor plan shows that a warehouse has a large overhead dock door on the east wall that remains open for extended periods during operations. What is the primary energy implication?
- Increased solar radiation entering through the transparent door panels
- Massive infiltration of unconditioned outdoor air raising heating and cooling loads significantly (Correct answer)
- Structural settlement from repeated door cycling affecting slab integrity
- Reduced fire compartmentalization requiring additional sprinkler heads
Correct answer: Massive infiltration of unconditioned outdoor air raising heating and cooling loads significantly
Large open dock doors create uncontrolled infiltration of outdoor air, dramatically increasing heating or cooling loads depending on the season.
Question 5: When developing a floor plan for energy code compliance under ASHRAE 90.1, what is the primary purpose of identifying 'semi-heated spaces'?
- To exclude them from occupancy-based lighting control requirements
- To apply less stringent envelope and lighting requirements than fully conditioned spaces (Correct answer)
- To qualify them for renewable energy tax credits under federal programs
- To exempt them from fire sprinkler coverage requirements
Correct answer: To apply less stringent envelope and lighting requirements than fully conditioned spaces
ASHRAE 90.1 defines semi-heated spaces as those with heating above 15 BTU/hr·ft² but not cooled, applying relaxed envelope and possibly lighting requirements compared to conditioned spaces.
Question 6: An energy manager uses floor plan dimensions to calculate that a building's perimeter length is 480 linear feet and the average wall height is 12 feet. What is the total gross exterior wall area?
- 5,760 square feet (Correct answer)
- 40 square feet
- 960 square feet
- 2,880 square feet
Correct answer: 5,760 square feet
Gross exterior wall area = perimeter × wall height = 480 ft × 12 ft = 5,760 square feet.
Question 7: In floor plan-based energy analysis, why is it important to identify 'interstitial spaces' between occupied floors in a healthcare facility?
- They are counted as conditioned floor area under Joint Commission standards
- They house critical MEP infrastructure whose heat gains affect adjacent conditioned floors (Correct answer)
- They serve as emergency egress routes requiring smoke control systems
- They are excluded from gross floor area calculations under all building codes
Correct answer: They house critical MEP infrastructure whose heat gains affect adjacent conditioned floors
Interstitial spaces in hospitals contain dense mechanical, electrical, and plumbing systems whose heat generation directly impacts the conditioning loads of occupied floors above and below.
CEM Floor Plan Development 5
An energy manager is evaluating floor plans for a retrofit project.
What does 'as-built' documentation mean in this context?