Design and Experimental Analysis of a New Drying System Using Natural Ventilation for Dishwashers

Abstract

In addition to washing, the drying of loads is one of the main functions of dishwashers. Drying takes place by completely evaporating the water particles on the surface of the loads in the dishwasher baskets. In the dishwasher washing algorithm, the drying step is started after the hot rinse step. After the hot rinse step, the amount of moisture in the cabinet is very high. Although there is no water heating in the cabinet during the drying step, the moisture density continues to increase due to the evaporation of the loads in the basket. In order for evaporation on the loads, and therefore drying, to continue, the cabin humidity must be reduced. Drying systems developed to achieve this basically perform the mechanisms of condensing the evaporated water droplets on a colder surface or removing them from the machine. In this study, a low-cost, sustainable and environmentally friendly drying system using natural ventilation method was designed. In the new designed system, the drying channels added to the machine allow the humid air in the cabin to be evacuated and fresh air to be taken into the cabin. The experiments performed for the study were carried out according to EN 60436 standard. Drying score and energy consumption of static, fan and designed natural convection system were compared for three different programs. When the average results of the three programs are examined, the drying efficiency of the new designed drying system is 9.9% higher than the static drying system and similar to the fan drying system. The new designed drying system consumes the least energy, while the fan system consumes 5% more energy. The static system consumes 7.5% more energy.