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of another system, especially a computer program designed for that purpose
CFD Projects
CAE Projects
Customized Software Tools
Delhi Metro Rail Corporation Workshop
Optimization of Ventilation System
Modeling and analysis
The workshop is made of one smaller inspection zone for the trains and a larger zone for maintenance work. Around 20 windows with louvers are provided at the bottom of the inspection zone and provision for exhaust has been made near the roof level. However, there are no inlet or outlet regions for air in the larger maintenance zone except for the entrance. The roof consists of galvanized tin sheets supported by suitable columns and struts. On the inspection zone side, provision has been made for air flow through lower windows and exhaust at the top. An extra entrance for the workshop is provided on one of the sides along with the main entrances. The problem was simplified into a 2D geometry which required lesser computational time and effort.
Figure showing the temperature distributions without ridge ventilators, insulations
Figure showing the temperature distributions with ridge ventilators
Conclusion
The optimization of the ventilation system in DMRC was done using the CFD tool so that the temperature inside the working zone is reduced to human comfort. It was found that Ridge ventilators would be able to reduce temperature inside the workshop by approximately 50C. The analysis results match closely with experimental measurements. This system was designed with the constraint of using only natural ventilation. Apart from this a system using insulating material and evaporative cooling was recommended to further improve indoor environment.
Objective
The “Delhi Metro Rail Corporation(DMRC)” which is the governing body of the metro network in Delhi has its maintenance workshops at Najafgarh. This workshop is a state of the art infrastructure supported with all engineering amenities to execute maintenance work of rail systems. Recently, it has come to the notice that the temperature inside the workshop becomes quite high during summers. The high temperature inside the workshop has become a major concern as it becomes difficult for people to work in such hot conditions.
So the Objective of the CFD analysis aims at reducing the temperature inside the workshop by placing the ridge ventilators at the roof which would provide an easy passage for the hot air.
Figure showing the modeling of DMRC workshop
Figure showing the temperature distributions with ridge ventilators, insulations