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Air Movement for Energy-Efficient Comfort in Conditioned Spaces
Credits available: 1 AIA HSW / 1 GBCI BD+C / 1 PDH / 1 IDCEC
As we move increasingly towards market viable net-zero buildings with initiatives like ASHRAE Vision 2020 and the 2030 Challenge, we must reevaluate the role that typical building components play in a facility’s energy efficiency. ASHRAE 55 has highlighted the impact of elevated air speed on thermal comfort, and in recent years innovative designs have reestablished air movement as an integral part of occupant comfort and energy conservation. Furthermore, recent changes to Appendix G of ASHRAE 90.1 allow the inclusion of energy savings from using elevated air speed in energy simulations. When integrated into new building designs, air movement allows a reduction of air conditioning capacity and ductwork. In the winter, low speed air circulation redirects heated air trapped at the ceiling, resulting in significant energy savings. Project teams working on net-zero buildings have proven the effectiveness of incorporating air movement in building plans as part of an integrated design strategy.
1. Primary factors affecting human thermal comfort and basics of ASHRAE Standard 55-2010 and the ASHRAE Thermal Comfort Tool.
2. Use of elevated air speed for increased air distribution efficiency & energy savings within air conditioned spaces.
3. Additional design benefits of minimizing ductwork, lower HVAC first cost, improved ventilation rates, and condensation reduction.
4. Stratification & Destratification, and the significant energy saving potential from destratifying a large open space