What Is a Chilled Beam System?
A chilled beam is an HVAC terminal that cools (and sometimes heats) a space using chilled water circulated through a ceiling-mounted beam, with room air induced across the coil by primary ventilation air. Chilled beams deliver exceptional energy efficiency and silent operation — no fans in the occupied space. The MEP engineer pairs them with a DOAS for ventilation; the combination is among the most efficient commercial HVAC architectures available.
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Active vs. passive beams
Passive beams rely on natural convection — simple, silent, limited capacity, suited to perimeter zones with moderate loads. Active beams use primary air from the DOAS to induce room air across the coil — higher capacity, the standard choice for offices and schools. Both eliminate zone-level fans, ductwork shrinks dramatically (only ventilation air is ducted), and ceiling plenums get shallower.
Condensation control
The design constraint: chilled water must stay above the space dew point or the beams sweat. The controls sequence monitors space humidity and raises chilled-water temperature or reduces capacity before condensation forms — this is why the DOAS handles the entire latent (moisture) load. In humid climates, the dehumidification design is what makes or breaks a chilled beam project. Properly designed, condensation is a non-issue; poorly designed, it is a ceiling-staining certainty.
Applications and cost
Best in offices, schools, labs, and healthcare — spaces with moderate sensible loads and good humidity control. First cost runs 10-20% above conventional VAV, paid back through 20-40% fan-energy savings, reduced ductwork, and lower floor-to-floor heights (shallower plenums can reduce the building's structural height). Maintenance is minimal — no filters or fans at the zone level, just periodic coil cleaning.
The bottom line
Chilled beams cool with ceiling water coils induced by DOAS ventilation air — silent, efficient, minimal ductwork. The DOAS must handle all humidity; first-cost premium pays back in fan energy and reduced plenum depth.
Torch Engineering PLLC · (480) 490-0064 · info@torchengineering.com — PE stamping backed by Apex Grid Engineering.