HVAC Residential vs Commercial HVAC 2

Question 1

Which type of HVAC system is most commonly used in large commercial office buildings?

Accepted Answer

Variable Air Volume (VAV) system

Answer

VAV systems allow individual zone control and are standard in large commercial buildings due to their energy efficiency and scalability.

Question 2

Commercial rooftop units (RTUs) differ from residential split systems primarily because RTUs:

Accepted Answer

House all components in a single cabinet on the roof

Answer

RTUs are self-contained units with all components (compressor, condenser, evaporator) in one cabinet mounted on the roof.

Question 3

A commercial chiller system uses chilled water loops instead of direct refrigerant expansion. What is the main advantage of this approach?

Accepted Answer

Ability to serve many air handlers across a large building

Answer

Chilled water systems distribute cooling via water pipes to multiple air handlers throughout a large building, making them ideal for large facilities.

Question 4

Residential HVAC systems typically operate on which electrical supply?

Accepted Answer

120/240V single-phase

Answer

Residential HVAC equipment operates on standard residential single-phase 120/240V electrical service.

Question 5

What does 'tonnage' refer to in HVAC system sizing?

Accepted Answer

The cooling capacity equal to 12,000 BTU/hr per ton

Answer

One ton of cooling equals 12,000 BTU per hour, which originated from the amount of heat needed to melt one ton of ice in 24 hours.

HVAC - Heating, Ventilation, and Air Conditioning Practice Test

HVAC - Heating, Ventilation, and Air Conditioning Practice Test

HVAC Residential vs Commercial HVAC 2