Underfloor air distribution: lessons learned

Summary

States that HVAC systems using underfloor air distribution (UFAD) promises multiple benefits including improved occupant satisfaction by providing control over personal air supply through the use of manually adjustable diffusers, making building systems more flexible and easily reconfigurable, with the result that churn can be less expensive; improving room ventilation by delivering fresh air closer to occupants and reducing building energy use due to decreased central fan energy, extended economiser cooling and improved cooling cycle efficiency. The challenge to a team designing a building with UFAD is to capture as many of the benefits as possible while keeping the initial cost increase to a minimum. With this goal in mind, discusses three design and construction topics to consider when using UFAD, based on experience on seven recent projects and which reflect feed back from owners, designers, contractors, occupants and building operators: 1) Minimise ductwork in the plenum, 2) Prevent plenum leakage, 3) Allow airflows to vary everywhere.

Primary Author(s): Daly A

Source: ASHRAE J., May 2002, vol.44, no.5, 21-24, 4 figs, 2 refs.

             BSRIA Abstract Doc 000103759 Abs 20020729

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