Earticle

The purpose of this study is to review the reliability of the CFD. To perform this study, CFD simulations were compared with experimental results based on the performance results of the diffuser line. The results of this study are as follows. 1) Looking at the results of indoor air distribution measurements, Air distribution of indoor through Air of diffuser could judge to be distributed of indoor air evenly. 2) It compared actual data of Cooling experimental and heating experimental with the CFD analysis results. the average error rate of Cooling was 6% and the average error rate of Heating was 6.9%. In air flow case, the air velocity is some different to 0m/s ~ 0.178m/s. Looking at the air flow and the air velocity, two results could judge to be similar to pattern. As a result, the predictions of the indoor thermal and airflow environment through CFD simulation are considered possible.

It is difficult to apply a conventional selection guide for diffusers when the diffuser is installed in a perimeter zone, because the ADPI(Air Diffusion Performance Index) vs. T/L(Throw/Length) curve listed in conventional guide does not consider the perimetric heating load. The objective of this study is to evaluate the effect of the perimetric heating load on the ADPI and to propose a selection guide for proper diffuser when perimetric heating load exists. The velocity and temperature distributions and the ADPI value are obtained numerically with various heat load ratios and air flow rates. The ADPI values by numerical result were compared with existing experimental data to verify the method for evaluation of ADPI proposed in present study. In case of a high side wall diffuser, the ADPI decreased with increases of the flow rate on every heat load ratio of present study except 0.75. Also, the ADPI vs. T/L curves have been proposed for the heat load ratios of 0.25, 0.5, 0.75 to guarantee comport thermal environment when diffusers are installed in perimeter zone.