HVAC Load Calculation and System Design 2

Question 1

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

Accepted Answer

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

Answer

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.

Question 2

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

Accepted Answer

14 SEER2

Answer

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.

Question 3

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

Accepted Answer

Homeowner's preferred thermostat settings

Answer

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

Question 4

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

Accepted Answer

Designing the duct system for proper airflow distribution

Answer

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.

Question 5

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

Accepted Answer

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

Answer

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

HVAC - Heating, Ventilation, and Air Conditioning Practice Test

HVAC - Heating, Ventilation, and Air Conditioning Practice Test

HVAC Load Calculation and System Design 2