A Complete Breakdown of How Automatic Hand Dryers Work

Have you ever wondered how automatic hand dryers work or why they are increasingly replacing paper towels in restrooms worldwide? Check out our complete breakdown of these bathroom devices to ensure you stock your commercial facilities with the ideal equipment.

Benefits of Using Automatic Hand Dryers

Before we dive into the actual functions of each part and mechanism, learning about the notable benefits of installing automatic hand dryers in your commercial bathrooms is important.

Increased Savings and Energy Efficiency

One of the primary benefits of installing automatic hand dryers in commercial bathrooms is their energy efficiency and associated cost savings. Unlike paper towels, which need constant replenishing and result in ongoing expenses, hand dryers are a one-time investment with minimal operational costs. Automatic hand dryers use electricity to generate warm air, but their energy consumption is relatively low. High-speed models can dry hands in as little as 10-15 seconds, significantly reducing the amount of energy used per drying session compared to older, traditional models. This reduction in energy use leads to substantial savings in electricity bills over time.

Enhanced Environmental Hygiene

Another significant benefit of automatic hand dryers is the enhanced hygiene they offer. As many of these devices are touchless, they minimize the risk of cross-contamination that can occur when multiple people touch the same surfaces, such as paper towel dispensers. Furthermore, high-end hand dryers come equipped with HEPA filters that remove up to 99.97% of bacteria, viruses, and other particles from the air before blowing the air onto the user's hands. This feature ensures these machines don't expose users to potential pathogens during their drying session, promoting a safer, cleaner restroom environment.

Superior Sustainability

Last but not least, automatic hand dryers contribute to environmental sustainability. Overuse of paper towels contributes to deforestation and results in a significant amount of waste that ends up in landfills. In contrast, hand dryers produce no waste, making them a much greener alternative. The energy required for producing, transporting, and disposing of paper towels far outweighs the electricity hand dryers use. By opting for automatic hand dryers, businesses can reduce their carbon footprint and demonstrate their commitment to sustainable practices, which is increasingly important to many consumers today.

How Different Hand Dryer Components Function

Now that you know more about the basic uses and benefits of automatic hand dryers, it's time to learn more about the specific functions of each dryer component. While these devices are full of different parts and mechanisms, the most important boil down to four systems: the sensor, heating element, filter, and airflow systems.

The Sensor

Sensor technology serves as the brain of an automatic hand dryer. It's the component that detects when your hands are under the unit and triggers the drying process. The two primary types of sensors involved in this task are infrared and capacitive (touch). Infrared sensors emit light that, when interrupted by the presence of hands, signals the machine to start blowing air. On the other hand, capacitive sensors measure changes in an electric field caused by the proximity of your hands. While both types have their merits, businesses commonly use infrared sensors due to their cost-effectiveness and lack of shared surfaces, whereas capacitive sensors are praised for their high level of accuracy. Understanding these technologies is crucial in appreciating the efficiency of automatic hand dryers.

The Heating Element

The heating element is a vital component of many automatic hand dryers. Once the sensor has detected your hands and activated the dryer, it's the heating element's job to convert electrical energy into heat. The unit blows the electrical energy out as warm air, evaporating the water on your hands. Hand dryers use two main types of heating elements: traditional wire coil elements and modern ceramic elements. Wire coil elements can heat up quickly but may be less energy-efficient, while ceramic elements provide better energy efficiency but might take slightly longer to reach their peak temperature.

However, it's important to note that not all hand dryers include a heating element. Some of the newer models, known as jet air or blade hand dryers, employ high-speed air jets instead. These no-heat hand dryers use a high-velocity sheet of unheated air to effectively "scrape" water off the hands. The lack of a heating element makes them more energy-efficient than traditional models, and they often complete the drying process faster, usually within 10-12 seconds. While they may produce a louder noise due to the high-speed airflow, many users find their speed and energy efficiency beneficial trade-offs.

Air Flow Mechanics

The sensor element doesn't just activate heat-it also triggers the airflow mechanics that power the blowing air! A motor-powered fan begins to spin when a user activates the dryer, drawing in air from the surroundings. The dryer directs this air over or through the heating element (if present), warming the air before expelling it through a nozzle or series of nozzles. The design and positioning of these nozzles are vital for optimizing the speed and direction of the airflow, ensuring it effectively removes water from the user's hands. In high-speed, no-heat hand dryers, the emphasis is on creating a fast, concentrated stream of air that can "scrape" the water off the user's hands. The velocity is paramount in these models, as they don't use heat to aid evaporation. The mechanics of this process involve careful engineering to balance efficiency, drying time, and user comfort.

Filtration Systems

Filtration systems are perhaps the most important components of modern hand dryers, especially in a post-pandemic world. These systems purify the air before blowing it onto the user's hands. As the fan draws in air from its surroundings, it passes through a filter that traps and removes contaminants such as dust, bacteria, and viruses. The most advanced models use HEPA (High-Efficiency Particulate Air) filters, which can remove 99.97% of particles that are 0.3 micrometers in diameter. By incorporating a filtration system, hand dryers ensure they dry users' hands effectively without exposing them to potential airborne pathogens during the process. This filtration system adds an extra layer of protection for both the user and the environment, enhancing the overall hygiene of the hand-drying process.

Understanding how automatic hand dryers work might not seem that important, but it can help you better appreciate the complexity of these simple-appearing devices. Air Delights proudly carries a wide selection of automatic hand dryers to meet the needs of your commercial restroom patrons and building occupants. Browse our collection today!