The main purpose of dishwashers in terms of heat transfer is to facilitate the efficient cleaning and sanitization of dishes. Dishwashers use hot water and detergents to remove food residues and bacteria from kitchenware. The process involves heating water to a specific temperature, typically around 120-150°F (49-65°C), enhancing the solubility of grease and improving the disinfecting ability of the detergent. As the water circulates through the dishwasher, heat transfer aids in dissolving and rinsing away contaminants, ultimately achieving clean and sanitized dishes. This integrated heat and cleaning process saves time and effort compared to manual washing.