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Load Calculation and System Design Flashcards

6 cards from real HVAC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 Load Calculation and System Design flashcards as text

  1. What does SEER (Seasonal Energy Efficiency Ratio) measure for air conditioning equipment?

    Answer: The seasonal cooling efficiency ratio of cooling output to electrical input over a cooling season

    SEER measures the total cooling output of an AC system divided by the total electrical energy consumed over a typical cooling season, with higher SEER indicating greater efficiency.

  2. What is the minimum SEER2 rating required for new central AC systems in the US southern region as of 2023?

    Answer: 14 SEER2

    As of January 1, 2023, the DOE mandates a minimum of 14 SEER2 (equivalent to approximately 15 SEER) for new split-system central air conditioners in the US Southeast and Southwest regions.

  3. What factor is NOT included in a Manual J residential load calculation?

    Answer: Homeowner's preferred thermostat settings

    Manual J calculates loads based on physical building characteristics and design weather data, not personal preferences like preferred thermostat settings.

  4. What is a Manual D calculation used for in residential HVAC?

    Answer: Designing the duct system for proper airflow distribution

    Manual D (by ACCA) is the standard procedure for designing residential duct systems to deliver the correct CFM to each room at acceptable static pressures.

  5. What is 'right-sizing' of HVAC equipment and why is it important?

    Answer: Sizing equipment to match the calculated load, avoiding both over- and under-sizing

    Right-sizing means selecting equipment whose capacity closely matches the calculated building load to ensure efficient operation, proper humidity control, and long equipment life.

  6. What is the significance of the 'heat gain through glass' component in a summer cooling load?

    Answer: Solar heat gain through windows is often the largest component of a building's summer cooling load

    Solar heat gain through glazing is typically one of the largest contributors to summer cooling load, making window orientation, size, and shading critical design considerations.