What is Dishwasher?
A dishwasher is a machine for cleaning dishware and cutlery automatically. Unlike manual dishwashing, which relies largely on physical scrubbing to remove soiling, the mechanical dishwasher cleans by spraying hot water, typically between 45 and 75 °C (110 and 170 °F), at the dishes, with lower temperatures used for delicate items.
A mix of water and dishwasher detergent is pumped to one or more rotating spray arms, blasting the dishes with the cleaning mixture. Once the wash is finished, the water is drained, more hot water enters the tub by means of an electro-mechanical solenoid valve, and the rinse cycle begins. After the rinse cycle finishes and the water is drained, the dishes are dried using one of several drying methods. Typically a rinse-aid, a chemical to reduce surface tension of the water, is used to reduce water spots from hard water or other reasons.
Process of dishwashing
- Energy use and water temperatures
In the European Union, the energy consumption of a dishwasher for a standard usage is shown on a European Union energy label. In the United States, the energy consumption of a dishwasher is defined using the energy factor.
Most consumer dishwashers use 75 °C (167 °F) rather than 83 °C (181 °F) for reasons of burn risk, energy and water consumption, total cycle time, and possible damage to plastic items placed inside the dishwasher. With new advances in detergents, lower water temperatures (50–55 °C / 122–131 °F) are needed to prevent premature decay of the enzymes used to eat the grease and other build-ups on the dishes.
In the US, residential dishwashers can be certified to a NSF International testing protocol which confirms the cleaning and sanitation performance of the unit.
The heat inside the dishwasher dries the contents after the final hot rinse; the final rinse adds a small amount of rinse-aid to the hot water, as this improves drying significantly by reducing the inherent surface tension of the water. Plastic and non-stick items form drops with smaller surface area and may not dry properly compared to china and glass, which also store more heat that better evaporate the little water that remains on them. Some dishwashers incorporate a fan to improve drying. Older dishwashers with a visible heating element (at the bottom of the wash cabinet, below the bottom basket) may use the heating element to improve drying; however, this uses more energy.
Errors in dishwasher
- F01 — Anti-flooding overflow
- F02 — Water fill solenoid valve failure
- F03 — Water drain failure/ timeout
- F04 — Thermostat fault
- F06 — Water fill timeout
- F07 — Water turbine damaged
- F08 — Temperature timeout fault
- F09 — Software error
- F20 — whirlpool duet fixing
Uses of dishwasher
Dishwashers can be used to cook foods at low temperatures, including turkey, salmon, beef, veal, tuna, shrimp, asparagus, spinach, pears, noodles, and couscous. The foods are generally sealed in canning jars or oven bags since even a dishwasher cycle without soap can deposit residual soap and rinse aid from previous cycles on unsealed foods. Check out the restaurant hood cleaning services.
Dishwashers also have been documented to be used to clean potatoes, other root vegetables, garden tools, sneakers or trainers, silk flowers,some sporting goods, plastic hairbrushes, baseball caps, plastic toys, toothbrushes, flip-flops, contact lens cases, a mesh filter from a range hood, refrigerator shelves and bins,toothbrush holder, pet bowls and pet toys. Cleaning vegetables and plastics is controversial since vegetables can be contaminated by soap and rinse aid from previous cycles and the heat of most standard dishwashers can cause BPA or phthalates to leach out of plastic products.The use of a dishwasher to clean greasy tools and parts is not recommended as the grease can clog the dishwasher.