3003 W CASINO RD PAINT HANGAR BOUNDARIES 2023-07-20

ICGeminus Boeing Project Contract No.EVE-16-2929 Technology Development CEI Project No. 160731 J.1....14017011.1.11 .41111.0. '41.1111.1.11 .101 11;4' it,. 41/4. Figure 10: Hangar interior configuration of Case 2 scenarios during fuselage painting. 2.3.5 Paint Scenario & Configuration 2.3.5.1 Case 1 Paint Scenario & Configuration Application of the clear coat was identified by Boeing personnel as potentially creating a baseline painting condition (paint type and paint gun combination). Thus it will be assumed that overspray from the individual paint guns creates a "cloud" of very fine paint droplets + air propellant that includes volatile vapors that outgas quickly from the small paint droplets due to the extremely large surface area to volume ratio (see section 2.2.3.2). The paint parameters for this clear coat baseline condition are identified in Figure 2, Table 1 shows the composition of the clear coat paint in the column labeled "Ingredient Mass % In Paint". Based on a maximum volumetric flow rate of 500 cc/min and densities obtained from ingredient MSDS, mass flow rate can be obtained. The last two columns in Table 1 show the flow rates and mass percentages for the spray gun stream used in CFD. These values are based on the following assumptions: • The spray gun has 60% transfer efficiency and 40% of the paint ends up in the cloud. This transfer efficiency is applied to the volatiles. • The non-volatile ingredients of the paint do not need to be modeled to capture the shape and convection of the overspray cloud and represent approximately 10% of the overall mass of the overspray. • All of the overspray volatiles instantly vaporize when they leave the spray gun. The rest remain in solution with the non-volatile ingredients on the plane surface. • The volatiles present in the overspray cloud are much more significant than any volatiles that outgas from the painted plane surface. Outgassing volatiles can be neglected in this analysis. 18