Module 1: Basic Concepts - Plane Geometry - Answers

#1: What 3-dimensional geometric shapes do you see in this fabric filter?

: Answer:; Common geometric shapes found in fabric filters include a rectangular solid (the outer shell), cylinders (the bags), and a pyramid (the hopper). Knowing the total surface area of the filter media (e.g. cylindrical bags) is important in determining the gross and net air-to-cloth ratios. These are basic design parameters that are frequently reviewed as part of a source's permit review process. The volume of the hopper is often evaluated to determine if there is sufficient dust holding capacity based on the estimated solids capture rates and the time periods between operation of the hopper emptying system.