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of another system, especially a computer program designed for that purpose
CFD Projects
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Dubai International Airport
CFD Analysis of Fresh Air Plantrooms
Figure showing the 3D modeling of the Fresh air plantroom in Dubai Airport
Conclusion
The air velocity, pressure distribution and also design verification was analyzed in the fresh air plant rooms in the Dubai International Airport using CFD . From the initial analysis it was found that there was an increase in velocity and back pressure due to the traveling distance of air till the discharge gallery. This was due to the less available area at the discharge gallery in between two columns. Due to this the primary axial fan was working with lower capacity than the designed. Moreover the Average face velocities on all the fresh air plant room components were unequal and did not meet the equipment manufacturer standards for both clean condition & full dirty (Clogged) conditions. By optimization technique, modifications were made in the design of Fresh air plant room. By this the air velocity distribution & pressure distribution were made optimal and the axial fans installed were working with the designed capacity. The Average face velocities on all the FAP components were optimized to permissible level so that the selected filters & cooling coils face areas are sufficient to maintain the permissible average face velocities in both clean condition & full dirty (Clogged) conditions.
Objective
Dubai International Airport (Phase-II) C3 project consists of 4 fresh air plant rooms to serve the clean (conditioned) air to various areas of the airport, in which 2 fresh air plant rooms are located at Basement-2(Level-2) level and other 2 fresh air plant rooms are located Basement-1(Level-1) level. The fresh air plant room is a room-made air handling unit with different customized components installed inside to clean the atmospheric air extracted. The objective of project was to,
a) Analyze the air velocity & pressure distribution inside the fresh air plant rooms at different sections for the given configuration of the components.
b) To study the effect of secondary fans installed at the end of different duct branches in clean condition & full dirty (Clogged) conditions in the initial design.
c) To optimize the fresh air plant room design to verify various factors like the velocity distribution along the components of fresh air plant room in the initial design proposed and to optimize the design to obtain an optimum flow distribution.
Modeling and Analysis
From the 2D CAD plan view & sectional drawings of the Fresh air Plant room of Level-1 as provided by the client the 3D CFD model was created considering all the equipments placed in the plant room. After modeling hexagonal and tetrahedral meshes with size varying from 100mm to 200mm was used with appropriate meshing scheme.The meshed geometry is used for solving the flow & pressure inside the basement fresh air plantrooms. Appropriate boundary conditions were given at different sections such as common inlet shaft, dampers, multi duty filters,prefine filters, carbon filters, cooling coils, primary fans, secondary fans and concrete walls & GI duct walls for both clean scenario as well as full dirty (clogged) scenario.