“A Review on Design of Passive Down Draft Evaporative Cooling in Commercial building”

Mechanical Engineering

This Paper is focused on the concept and design methodology for a passive downdraft evaporative cool tower application. Passive evaporative cooling is a very efficient cooling application, but is often offset by fan energy. The cool tower concept utilizes pressure differences (stack effect) to move air through the building. To further enhance this air movement, a negatively pressurized atrium creates an additional ‘pull’ so to correctly define the path of airflow, moving the cooler air into occupied areas that require cooling. There is a common misconception in industry today, that the passive downdraft evaporative cool tower model cannot be explicitly modeled and requires “workarounds”. This paper aims to clearly define an explicit workflow, devoid of workarounds. This type of application can be used in many locations, but is especially useful in areas that can be simultaneously hot and dry. The presentation shall analyze the inputs required to simulate this innovative design such as louver intakes, airflow controls and bulk airflow. Finally, certain outputs shall be examined and compared by using this design, with variables such as building energy consumption and thermal comfort of occupants.

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