Research Of Perforated Panel Used For Underfloor Air Distribution

With the development of science technology and the improvement of people’s living standard, it has become a growing concern to improve indoor air quality and solve the problem of air conditioning energy consumption. Because of good air quality, low energy consumption, strong adaptability and so on, downside air supply is widely used. As one of downside air supply, Underfloor air distribution is applied to office buildings increasingly. In this paper, perforated panel in the application of underfloor air distribution is mainly studied by using numerical simulation method.According to the office building of occupant density is0.1person/m2,0.2person/m2,0.3person/m2, indoor temperature field, different velocity field and the distribution of PMV are studied at different supply air volume and supply air temperature. The results show that:supply air volume will affect the indoor temperature gradient, the larger supply air volume is, the smaller temperature gradient is; supply air temperature will not affect the indoor temperature gradient, Improve the supply air temperature, indoor temperature will increase overall.And through simulation, the recommended values of three office buildings’supply air parameters are obtained.Indoor temperature field, velocity field and the distribution and the distribution of PMV swirl diffusers when using perforated panel are compared with that when using swirl diffuser are compared. The results show that:next to the inlet, temperature gradient is smaller when using swirl diffuser than that using perforated panel,but air velocity is lager when using swirl diffuser than that using perforated panel. Temperature field, different velocity field and the distribution of PMV are not different obviously. In practical engineering, swirl diffuser can be replaced by perforated panel.Effect of inlet size, shape, number, distance from the wall on indoor temperature field is studied, The results show that:the smaller inlet size is, the smaller temperature gradient is; the fewer number of inlet size is, the smaller temperature gradient is; Inlet size, shape, distance from the wall have little effect on the indoor temperature field. And through simulation, the recommended values of three office buildings’supply air area are obtained.The relation of indoor load and the air volume, the relation of the indoor load and supply air area are obtained, and models are established to validate. The results show that: the relation given can be applied in practical engineering.