Abstract
This paper presents the results of CFD simulation on the ventilation efficiency in a multi storied underground car park. In this study the influence of supply/exhaust air imbalance of mechanical ventilation system, and the buoyancy effect of heat from ground and vehicles were studied with the age of air obtained from CFD. The results of this paper are following ; (1) In Case 1 (supply air volume= exhaust air volume), the distribution of the age of air was almost same in each floor. There fore it is easy to plan the ventilation system such as the layout, of the high velocity fan-diffuser unit for the stagnant region. (2) In Case 2 (supply air volume < exhaust air volume), the airflow through the ramps was activated and the difference in the ventilation efficiency of each floors was observed. In this case, the planning of ventilation system becomes relatively difficult. (3) In Case 3 (supply air volume > exhaust air volume), the airflow through the ramps was activated and the difference in the ventilation efficiency of each floors was observed, as same as in Case 2. (4) The buoyancy effect due to the heat transfer between indoor air and ground walls on the distribution of temperature and the age of air was observed in the lowest floor in summer and winter. (5) When the heat generation from vehicles was considered in the simulation, the air diffusion was activated due to the buoyancy effect.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
