Ventilation performance evaluation of rectangular jet-enhanced exhaust hood under the influence of thermal contamination jet in industrial buildings

In industrial contexts, exhaust hoods play a pivotal role in the control of heat and heat-driven pollutants during manufacturing processes. The present study focuses on the rectangular jetenhanced exhaust hood (RJEH) in an industrial building affected by the thermally contaminated jet as the case study object. In this study, the CFD method was employed to assess the performance and the performance impact factors of the RJEH, utilizing capture efficiency as the evaluation index. Based on the performance study, the optimal operating parameters and the selected method were also analyzed. The findings indicate that, in comparison with conventional exhaust hoods, the implementation of radial jets has the potential to improve the performance of rectangular hoods significantly by impeding contaminant spillage through the blocking effect. The performance of RJEH was found to be primarily influenced by two main factors: jet velocity and exhaust rate. The employment of optimal parameters enables the RJEH to withstand the adverse effects of external variations, attaining capture efficiencies of 90 % or more under diverse conditions. The results of the study can provide assistance in the efficient design of industrial ventilation and serve as a reference for promoting national high-performance ventilation technology and industrial energy conservation.