> 1,000 Words: Secondhand Smoke Animations
If ”a picture is worth 1,000 words,” then what is the value of an infographic, an animation, or a data visualization? The Innovation Exchange is developing methods to clarify complex energy concepts and provide technical information. With the help of designers, animators, and videographers, we will produce this content for the web. > 1,000 words will be a regular feature of i.e. in which we will feature our visualization efforts.
"The animations that I create for CEE serve as an educational tool to help viewers better understand the complex nature of the ongoing research projects. Creating these animations requires utilizing both your left and right brain as it entails understanding the technical content before translating it into a more creative visualization structure."
-Huma Saqib, Animator
Even though the walls of an apartment look solid, air buoyancy and pressure differences between interior spaces cause air to move between rooms and even to other units in the building. And as it travels within a building, air pollutants such as secondhand smoke (SHS) can find their way from one unit to another. Stack, wind, and exhaust fan effects are all interior air driving forces that affect the migration of SHS within a multifamily apartment building.
In winter, for instance, the heated air inside the building has a lower density than the colder outside air. Think about a hot air balloon: warm air rises. Because of its buoyancy, the warm indoor air tends to rise and escape out of the top of the building. This air movement draws cold outside air in through the lower part of the building. Watch the Winter Stack Effect animation below to see how as the interior air rises, SHS migrates with it from lower to upper apartment units.
In summer, the opposite airflow occurs. The conditioned indoor air is cooler and denser, and therefore tends to flow towards the lower half of the building. Warm outside air is drawn into the upper half of the building. As you can see in the Summer Stack Effect visualization below, the interior air movement entrains SHS from higher to lower units.
Whatever the temperature, when air flows from a high pressure area to a lower pressure area, it creates wind. And when wind impinges on a building, the interior air tends to flow from the windward side to the leeward side, i.e. from high pressure to low pressure. Our Wind Effect animation shows how air carries SHS as wind pushes it from one unit to an adjoining unit.
In addition to the weather, mechanical factors can affect indoor air movement. In the next animation, you can watch as an exhaust fan sucks air out of a room, mechanically lowering its pressure. This create a pressure difference between the room and its surrounding areas. Since air flows from high pressure to low pressure spaces, air from the adjoining rooms is drawn into the room where the exhaust fan is running. Our final visualization shows how the Exhaust Fan Effect can entrain SHS from an adjoining unit below.
We hope that our animations will improve your understanding of the air driving forces in buildings and how they affect secondhand smoke transfer between apartments. Feel free to link to or embed these videos from this blog post, our resource page, or our YouTube site.
The motion graphics animations were designed and produced by Huma Saqib.
For updates on similar resources, sign up for our Innovation Exchange News & Events mailing list.