| Abstract [eng] |
Commercial kitchens are subject to high heat loads, vapour, fumes, odours and various aerosols, which are generated during cooking processes. Studies have shown, that long term exposure to cooking emissions creates adverse health effects for kitchen workers. To be able to control kitchen environment, improve thermal conditions and remove harmful cooking emissions, exhaust hoods are utilised. Inside an exhaust hood, separation of grease and condensate takes place in order to reduce ventilation maintenance costs and ensure that fire safety and hygienic requirements are met. A number of grease filtering techniques exist, however, the majority of hoods utilise single stage filtering using grease separators. The goal of this study is to determine pressure drop and grease extraction efficiency characteristics of exhaust hoods produced by a Lithuanian manufacturer. In this study, pressure drop characteristics of exhaust hoods with condensing plates and two different types of grease separators are determined. Pressure drop characteristics are essential for selection process of an exhaust fan. What is more, these characteristics are also used for determining exhaust hood air flow rate, so that ventilation engineers are able to adjust it to a required air flow rate. A comparative study of 3 different types of grease separators are carried out in order to identify the most efficient type of separators by determining and comparing their fractional separation efficiencies. For this analysis, a special experimental stand is designed and utilized for testing. This study will allow to determine the most efficient type of grease extractors. |
