Load Calculation and Blueprints Flashcards
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Read the first 7 Load Calculation and Blueprints flashcards as text
Which ACCA manual is the industry standard for residential cooling and heating load calculations?
Answer: Manual J
ACCA Manual J is the nationally recognized standard for calculating residential heating and cooling loads.
On a residential blueprint, what does the symbol 'CFM' stand for in ductwork notation?
Answer: Cubic Feet per Minute
CFM stands for Cubic Feet per Minute, which is the standard unit for measuring airflow volume in HVAC systems.
When calculating cooling loads, which factor accounts for heat transmitted through walls, ceilings, and floors?
Answer: Conduction load
Conduction load accounts for heat transfer through the building envelope, including walls, ceilings, and floors.
What does a dashed line typically represent on a mechanical floor plan?
Answer: Hidden or overhead ductwork
Dashed lines on mechanical plans typically indicate ducts or components located above or below the primary plane of view.
In a Manual J calculation, what is the design temperature difference (DTD)?
Answer: Difference between outdoor design temp and indoor setpoint
The design temperature difference is the difference between the outdoor design dry-bulb temperature and the desired indoor setpoint temperature.
Which blueprint drawing type shows a view from directly above, revealing room layouts and duct routing?
Answer: Floor plan
A floor plan is a top-down view showing room layouts, walls, and the routing of ductwork on that level.
What does the 'R-value' represent when reading insulation specifications on blueprints?
Answer: Thermal resistance of the insulation material
R-value measures a material's resistance to heat flow; higher R-values indicate better insulating performance.