Optimization research for horizontal spacing of no-duct inducing fan system

For the problem of reasonable longitudinal and horizontal spacing of inducing fan in ventilation system in underground garages, the test of single inducing fan was carried out. Comparing the results of the test and of the numerical simulation, boundary conditions of numerical simulation were determined. By using fluent software, appropriate longitudinal spacing of inducing fan was gotten. Thinking of the poly trope of volume capacity ratio and parking utilization factor, the concept of garage utilization coefficient was defined. On this basis, CO concentration is taken as control standard in this paper and numerical simulation is performed for kinds of small space models. As a result, we get the recommended values of reasonable horizontal spacing for inducing fans´ arrangement. Reference data are given for the design of no-duct inducing fan system of underground parking garages in future.