It is reported that cooking can generate many kinds of airborne pollutants,which pose serious threats to human health. Kitchen range-hood is themost effective and popular equipment to exhaust the airborne pollutants,including smoke and oil particle in people’s daily life. The lack of astandardized and overall approach to test and evaluate range-hood makesboth consumer and some manufacturers confused. For these reasons,Lawrence Berkeley National Laboratory published a report, whichshowed the results of their elaborate experiment and some conclusion.However, they also pointed out that due to the limitation of the apparatus,some of the results are not reliable.Therefore, this project established a numerical model in Fluent toinvestigate the pollutant removal performance. Many attempts had beenmade before a validated numerical model was accomplished because aproper model needs the balance between iteration time and resultaccuracy. The validation part is presented in the literature. The captureefficiency curve of the numerical model and one of experiments show agood agreement at the low power input. Some conclusions are drawn onhow power inputs and height affect the capture efficiency, respectively.Dimensionless analysis is done to find a general characteristic curve forevaluating the removal performance of a particular range-hood. / Det rapporteras att matlagning kan generera många typer av luftburnaföroreningar, vilket utgör allvarliga hot mot människors hälsa.Köksfläkten är den mest effektiva och populära utrustningen för attventilera ut luftburna föroreningar, inklusive rök och oljepartiklar imänniskors dagliga liv. Bristen på ett standardiserat och övergripandetillvägagångssätt för att testa och utvärdera köksfläktar ställer bådekonsumenten och vissa tillverkare i okunskap. Av dessa skäl publiceradeLawrence Berkeley National Laboratory en rapport, som visade resultatenav deras utarbetade experiment och en slutsats. Men de påpekade ocksåatt på grund av begränsningen av utrustningen är några av resultaten intehelt tillförlitliga.Därför fastställde detta projekt en numerisk modell i Fluent för attundersöka avlägsnandet av föroreningar. Många försök hade gjorts innanen validerad numerisk modell uppnåddes, eftersom en riktig modellbehöver balansen mellan iterationstid och resultatnoggrannhet.Valideringsdelen presenteras i litteraturen. Effektkurvan för dennumeriska modellen och ett av experimenten visar en godöverensstämmelse vid låg effektinmatning. Några slutsatser dras av hurkraftingångar och höjd påverkar upptagningseffektiviteten.Dimensionslös analys görs för att hitta en generell karaktäristisk kurvaför att utvärdera avlägsnande av prestanda för ett viss köksfläkt.

Occupational exposure limits are known to have different distribution values around the world. In recent years occupational exposure limits were reviewed in Lithuania and other Eastern European countries. The changes in occupational exposure limits should influence the hood flow rate. However even today the projectors continue using the same air flow rate equations that were developed years ago. The engineering methods are no longer compatible with sanitary standards. The major dangers resulting from this approach are the occupational exposure limits exceed allowed quotas in workplace or the energy consumption is harmfully inefficient. It is crucial to compare the treatment of occupational exposure limits among various countries and the different existing methods of calculating exhaust air flow rate. Additionally, it is important to consider the factors that may compromise the reliability of this study. Lithuania's occupational exposure limits are in general lower than in other countries. The ratio of occupational exposure limits is about 1:100 in different countries.Exhaust air flow should be inversely proportional to occupational exposure limits. It was found that volumetric exhaust flow rate have a circular dependence on occupational exposure limits by making comparison among different countries. The purpose of this study is to draw attention to the issue of small countries to use the volumetric exhaust air flow rate equations of big countries (USA, Russia, Germany etc.)... [to full text]