How Chiller, AHU, RTU work - working principle Air handling unit, rooftop unit hvac system

The video tutorial explains the role of chillers in air conditioning systems, focusing on two main types: water cooled and air cooled chillers. Water cooled chillers, typically found in large commercial buildings, use a cooling tower to reject heat. Air cooled chillers, often located on rooftops, use ambient air for heat rejection. The video also covers Air Handling Units (AHUs) and Rooftop Units (RTUs), which distribute conditioned air within buildings. AHUs are usually connected to a central chiller, while RTUs are self-contained units with their own refrigeration systems.

What is the primary function of chillers in a building?

• To generate chilled water for air conditioning

• To generate electricity

• To supply fresh water

• To provide heating

Where are water-cooled chillers typically located in a building?

• In the attic

• In the parking lot

• In the basement or lowest floor

• On the roof

How do air-cooled chillers reject unwanted heat?

• By using a cooling tower

• By using a heat pump

• By circulating water

• By blowing air across the condenser

What is a key difference between AHUs and RTUs?

• RTUs are self-contained units

• AHUs are always located on the roof

• RTUs are used only in residential buildings

• AHUs have built-in refrigeration systems

What is the main purpose of Air Handling Units (AHUs)?

• To store water

• To distribute air around defined areas within a building

• To generate electricity

• To provide heating only

What component in RTUs allows for air recirculation?

• Heat exchangers

• Dampers

• Compressors

• Filters

What is a common feature of RTUs?

• They require a cooling tower

• They are compact and self-contained

• They are located in the basement

• They are used only in industrial settings