Luktreducering av stekos med absorptionsteknik

Sammanfattning: In exhaust and supply air ventilation with heat recovery, heat and moisture is transferred by a heat exchanger from the warm exhaust air flow to the cold supply air flow. Rotary regenerators are widely used due to their high efficiency, but have the drewback of transferring odourants from the kitchen hood exhaust air to the supply air. This causes odour problems that must be prevented.   In this study, odour control by absorption has been studied theoretically in order to investigate whether it is possible to efficiently remove odorants from the kitchen hood exhaust air and minimizing heat losses simultaneously during the absorption process. By studying the olfactory system, some physicochemical properties of odorant molecules were identified. Furthermore, the mechanisms of mass and heat transfer were considered in order to identify the factors that affect the rate of mass and heat fluxes between the liquid and gas phases. Also, the main factors involving the design of packed columns were investigated.   The study showed that there are several similarities between mass and heat transfer. Thus, some of the factors that were found to increase the rate of mass transfer also tend to cause an increase of heat transfer. Therefore, it is concluded that other options than absorption should be considered.