With the increasing number of private cars possessed by salaried people, there has been a change in the condition of ventilation for underground garage. In accordance with this new situation, and from the point of energy saving, this article specially points out an approach, which can determine and control the quantity of ventilation for underground garage.
Above-ground multi-level car parks in large shopping centres are highly amenable to hybrid ventilation applications, particularly those centres with retail shops at the lower levels and car parks at the higher levels. The higher level car parks allow the benefit of higher wind velocity and better dissipation of car exhaust emissions than at ground level; at the same time, larger perimeter wall opening area can be used without affecting the aesthetic feature of the building.
This paper presents the field experiments on the ventilation efficiency in an underground car park where high velocity fan-diffuser units were installed as shown in Photo 1. The concentration of SF6 were measured as tracer gas under the step up condition and the step down condition, and the ventilation efficiency such as the age of air were calculated from the rising curve and the falling curve of the SF6 concentration in the underground car park. The ventilation efficiencies of two cases were compared, i.e.
This paper presents the results of the numerical simulation on the ventilation efficiency and the residual age of air by using CFD in the underground car park in which the field measurement was conducted as shown in a previous paper. The agreement between the CFD result and the measurement one was observed at most of the measuring points. The detailed distribution of local air change effectiveness was examined with the results from CPD in this paper.