Multi Zone Flashcards
What are two reasons we use zoning systems in hvac
Comfort and efficiencies
Why do zoning systems save money compared to non
Each zone can control its own area
What are three ways a vav system can be controlled
Pneumatically
Electric from stat
Automated control system
What is a ACS and VAV box considered in technology when together
Advanced
Why are VAV boxes popular in small commercial construction
Because of its versatility to to present to change the zone
What kind of zone system is used for interior office buildings
Single zoned because interior zones create heat from lights , equipment , and people
What is used on exterior zones in a commercial building
Single duct unit with reheat coil
What is used in conjunction with exterior commercial building
Reheat cool
Baseboard heating
List seven types of VAV terminals used in a commercial building
Dual duct non mixing
Dual duct mixing
Fan powered
constant volume
Variable volume
VAV diffuser
Induction terminals
Describe the functions of dual duct system
There are perforated baffles that mixes too airstreams which modulate depending on the demand for hot or cold
What is the main difference between mixing and non mixing terminal boxes
The perforated baffles which mixes the air
List too types of fan powered VAV terminals units
Variable volume . Parallel flow
Constant volume in series
How do induction terminal units works
Used primary air supply that flows through a group of nozzles to induce airflow through the terminal
List five advantages of using VAV diffuser
Control and comfort
Control volume for space
Easy to install and relocate
Flexibility for future requirements
Maintenance
Dose a multi zone run off of high pressure velocity air
They run off low velocity ducts for each zone and can use up to 12 zones
