Energy-efficient and cost-effective space conditioning in offices and other commercial buildings usually use the underfloor space for the supply air static-pressure plenum. The airflow in a plenum of the underfloor air supply was simulated by a computational fluid dynamics (CFD) program,and full-scale experiments were conducted to validate the calculation results in May 2005. The results show that the CFD- predicted results in the plenum were in good agreement with the measured results. Two main factors, air velocity and beam height, affect the airflow in the plenum. Pressure loss mainly occurs around the beam. In the underfloor plenum the structural design should reduce the crossbeam height as much as possible, and in operation should reduce air velocity in the plenum.
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