LAUSR

Abstract A local lateral exhaust hood can be used to capture the contaminated airflow in the industrial production process. For the design of the lateral exhaust hood, the flow ratio method is commonly adopted. However, there are three major concerns in the existing calculation formula of the limit flow ratio for the lateral exhaust hood: 1 The influence of the horizontal width of the hood is not considered. 2 The influence of the installation height of the hood is not accurately presented. 3 The influence of temperature difference between polluted air flow and environment is not considered. By analyzing the variation of the limit flow ratio of the hood with the above three different influencing factors, the existing calculation formula of the limit flow ratio for the lateral exhaust hood is corrected, and the limit flow ratio correction formula is obtained when the temperature difference Δt = 0∼1200 °C. Therefore, the improved formula of the limit flow ratio for a lateral exhaust hood could guide a more precise design of the exhaust system, which is significant to save energy, ensure the workers’ health, and step into sustainable development.