Participants Contractors Raised Floor Improved Indoor Air Quality Improved Thermal Comfort Extended Economizer Use Higher COP Reduced Cooling Loads Reduced Fan Power Install diffusers relative to furniture as per design to allow stratified temperature profile and “upward” air motion. Seal edge details around the floor plenum to avoid leaks outside the plenum and short circuits that would increase fan energy use. In open plenums leakage is a major problem: seal floor panels and edge details around the floor plenum to avoid floor leaks, leaks outside the plenum and short circuits.10 In ducted plenums leakage is not an issue: do not seal floor panels or use sealing on what can be easily removed to ease access. In open plenums leakage control has top priority: overlap carpet and floor panel joints. In ducted plenums ease of access can be the priority: align carpet with floor panel joints or use nonadhesive carpet tile. Mechanical Furniture Carpet Install diffusers and underfloor equipment as per design unless problems are apparent. Coordinate resolution with other participants. Avoid covering diffusers with furniture. Install diffusers relative to occupants and furniture as per design unless problems are apparent. Coordinate resolution with other participants. Reduced Energy Use Easy Reconfiguration Potential Benefits of UFAD Locate furniture and interior partitions as per design. Client System Operator Set outdoor airflow to meet occupant needs (ASHRAE 62.1). In VAV–Maintain SAT to the recommended minimum (65°F [18°C]) to reduce airflows and avoid air mixing. Adjust thermostat setpoints based on UFAD characteristics of temperature stratification and higher supply air temperature. Increase SAT in periods of low cooling loads. Use economizer. Increase SAT in periods of low cooling loads. Maintain supply air temperature (to the space) about 65°F (18°C). Account for thermal decay (4°F to 8°F [2°C to 4°C]) in open plenum. Maintain supply air temperature about 65°F (18°C). Account for thermal decay 4°F to 8°F (2°C to 4°C) in open plenum. In VAV–Maintain SAT to 65°F (18°C) to avoid higher airflow settings that break down temperature stratification. Reduce unnecessary heat gains in the occupied zone: select energy efficient equipment, use the window blinds, turn off computers and task lights when they are not in use. User Improved Indoor Air Quality Change thermostat setpoint instead of having the diffuser permanently closed, which could compromise IAQ. Improved Thermal Comfort Adjust diffuser to suit thermal comfort preferences. Report complaints to the designated operations contact. Reduced Energy Use Extended Economizer Use Higher COP Reduced Cooling Loads Reduced Fan Power Easy Reconfiguration Table 1 (continued from previous page): Role of participants in the achievement of UFAD benefits. July 2009 ASHRAE Journal 37