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Modern enviromentally controlled spaces consume significant amounts of energy in maintaining a stable environment within their structures. The demands for heating and cooling vary greatly over time, and different strategies are employed to respond to these varying loads. Ventilation requirements must also be met by the HVAC-system. This conditioned and ventilated air must be effectively delivered to the building occupants. Proper diffuser selection is necessary to ensure adequate mixing of the ventilation air in the space and occupant comfort. The discussion in the article is limited to ceiling supply because it is the predominat method of introducing conditioned air into conditioned spaces in commercial applications. Failure of select diffusers with regard to proper design can result in discomfort and concerns over poor indoor air quality. Diffusers are created with specific performance parameters inherent in each design. These parameters need to be understood and used in selecting the size and type of unit for each situation. Recent comfort cases have shown that the engineer can no longer allow the architect to make the decision on diffuser selection based on appearance allone. Architects and engineers need to cooperate to ensure that all their needs are met.
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