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This passive cooling strategy takes advantage of temperature stratification and associated pressure differentials: As air warms it becomes less dense and rises. Ambient, cooler air replaces air that has risen.

Atria, sky gardens, two-layer wall cavities and solar chimneys.

Use of natural pressure differentials to induce air flow from cooler lower levels to warmer upper levels, by means of atria or solar chimneys.

Reduced first cost due to smaller mechanical equipment. Lower operational cost due to reduced mechanical ventilation cost. Higher ventilation effectiveness due to same direction of air flow and thermal uplift.

Increased occupant comfort and productivity as users enjoy immediate response to changes in their comfort requirements without affecting other occupants. TAC systems supply air prior to extensive mixing with room air, providing best possible indoor air quality. Individuals can change the perceived temperature by a minimum of 3ºf (5ºc) and up to 4.5ºf (8ºc) by varying the volume and direction of airflow. The ventilation rate is 1.5 to 2 times that of conventional systems.

Increased occupant comfort and productivity as users enjoy immediate response to changes in their comfort requirements without affecting other occupants. TAC systems supply air prior to extensive mixing with room air, providing best possible indoor air quality. Individuals can change the perceived temperature by a minimum of 3ºf (5ºc) and up to 4.5ºf (8ºc) by varying the volume and direction of airflow. The ventilation rate is 1.5 to 2 times that of conventional systems.

1.2.2 Displacement Ventilation
1.2.9 Underfloor Air Distribution