TROX UK - Chilled Beams Design Criteria

Multi Service Chilled Beams Selection Parameters

Chilled Beams

TROX offers a vast variety of chilled beams. There are two kinds of beam types, active and passive. Both systems can be mounted either flush or exposed. In addition, TROX TCB series of beams are recessed into a ceiling void above a perforated ceiling tile.

Passive chilled beams are a simple yet effective cooling device comprising of a cooling coil within a casing. As warm air at ceiling level passes over the coil, which is cooled with chilled water (14°C), the warm air is cooled as it passes over the coil. The sides of the casing promote a stack effect within the beam. This directs cooled air down into the occupied zone. This air is then replaced by warm air from above the coil in a continuous motion.

Active chilled beams use primary air to create a low pressure inside the casing which draws or induces room air through a heated or cooled coil. The mixed primary and induced air is then discharged via slots into the occupied zone.

Typical selection parameters for TROX TCB Passive Chilled Beams:

• Outputs from 125W/m to 350W/m with 1 row coils & 125W/m to 600W/m with 2 row coils
• Outputs of 300W/m give air velocity of 0.25m/s @ 1m below chilled beam
• Suitable for open ceiling areas & behind perforated ceiling tiles down to 30% free area
• Minimum 3.2mm post painted hole size
• Minimum 300mm ceiling void required

Typical selection parameters for TROX active chilled beams – DID300 / DID600

• Cooling output up to 500W/m
• Heating output normally 50% of cooling
• Typical installation from 1.8 to 3.6m ctrs
• Typical unit height 300mm
• Single beam lengths up to 3.6m
• Side, end & top entry air connections available
• Constant air volume preferred
• 1 or 2 way discharge

Multi-Service Chilled Beams combine cooling and/or heating with a range of other services including:

• Sprinkler Systems
• Lighting
• Public address systems
• Smoke detectors
• PIR sensors
• BMS cables
• Voice & data cables
• CCTV
• Smoke sensors

Recent advances in energy efficiency of MSCBs include optimised nozzle configuration and design, giving more flexibility to consulting engineers with regards to cooling outputs as well as managing the pressure drops across the chilled beams. The higher induction ratio
s, help reduce the amount of primary air supplied to the chilled beam to achieve the required cooling outputs. This, when coupled with the optimised TROX nozzle technology, not only helps reduce the AHU plant size, but also manage the external static pressures that the plant has to operate within. The minimised pressure loss, and optimised induction ratio, means highest possible cooling capacities, incorporating smaller AHUs with lower specific fan powers.