Paper Conference

Proceedings of eSim 2014: 8th Conference of IBPSA-Canada


Simulating a Passive Downdraft Evaporative Cool Tower

Liam Buckley

Abstract: This paper is focussed on the concept, design and simulation 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 utilises pressure differences (stack effect) to move air through the building. To further enhance this air movement, a negatively pressurised 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 down-draft evaporative cool tower model cannot be explicitly modelled 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; e.g. Calgary, AB. The presentation shall analyse 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.
Pages: 771 - 782