Active Chilled Beam

An active chilled beam consists of a heat exchanger and an integral air supply. It is normally suspended from a ceiling.

Required Objects

The active chilled beam must have the following properties.

• It must be connected to an air system.
• It must be connected to a hot water loop.
• It must be connected to chilled water loop.
• It must be attached to a conditioned zone.

Design Assumptions

If a chilled beam is in an air system designated as a dedicated outdoor air system (DOAS), its supply air flow rate is limited to the ventilation rate.

Property	Value	Notes
System air flow	Constant
Induction ratio	2.5	This is a fixed induction ratio.
Cooling discharge air temperature	17°C
Heating discharge air temperature	29.44°C
Air system primary air temperature	N/A	Determined by the air system (typically 12.7778°C).

Cooling Coil

The cooling coil has the following assumptions.

Property	Value	Notes
Coil entering air temperature	N/A	Mix of air system and induced zone temperature.
Design coil leaving air temperature	17°C	It is on the colder side of discharge temperatures.
Chilled water design inlet temperature	N/A	Set by the chilled water loop.
Chilled water design outlet temperature	N/A	Set by the chilled water loop.

Heating Coil

The heating coil has the following assumptions.

Property	Value	Notes
Coil entering air temperature	N/A	Mix of air system and induced zone temperature.
Coil leaving air temperature	29.44°C
Hot water design inlet temperature	N/A	Set by the hot water loop.
Hot water design outlet temperature	N/A	Set by the hot water loop.