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Cfmf Case Study

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2.3.2.1. Air Flow
The most important environmental factor that impacts a self-ventilated TMF design is the natural airflow and mechanical ventilation of the indoor parking spaces. Natural airflow not only impacts indoor ventilation, but also plays important role in dissipating the heat generated from operation of transparent LEDs. This ventilation and heat dissipation takes place through the air gaps in the LED panels in addition to the built in heat sinks.

The ventilation of an indoor parking garage consists of introducing acceptable air from outside and to filter / dilute the polluted air caused by car emissions, especially carbon monoxide (CO), and maintaining levels of contaminants to reasonably healthy levels. The flow of outside air …show more content…

Ventilation rates for enclosed parking garages can be expressed in terms of either flow rate per unit floor area such as CFM / ft, or CFM / parking space, or air volume changes (ACH) per unit time. Since our focus was the impact of TMF on the parking space ventilation, and since each parking space itself was the source of smoke, CO and air pollution, resulting from cars using the parking, we chose to measure the impact in terms of CFM / parking space. CFM refers to the method of measuring the volume of air moving through a ventilation system or other space, also known as "Cubic Feet per …show more content…

We used a single GRC panel fitted with TMF panel for the analysis because each panel is the smallest repetitive unit of the façade. Using this methodology and assuming any single direction of wind at 5 mph, the indoor air flowing through the transparent façade was estimated at 8,440 CFM / square meter. Additionally, in emergency situations, 12 fans per floor were also capable of circulating additional @ 3050 CFM / fan totaling 36600 CFM. Therefore the total CFM airflow through parking area could reach to as much as (36600 + 136,000) 172600 CFM / floor /128 parking spaces, which meant the net maximum CFM available for each parking space was as high as 1348 CFM. Since according to the international standards the minimum CFM recommended for indoor parking is 500 CFM under ambient conditions, the level achieved with the TMF installed were already more than twice the International

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