The way these different power options are created is with the blades centrifugal motion. The air is blown in with holes that have a safety screen on top that protect your hair from also being caught by the hairdryer. The more power used by the fan, the faster the blades will spin. When the blades begin to spin faster that means that more air is being pushed through the dryer and thus creating more pressure used for drying your hair at a faster rate.
Sources: Toothman, Jessica. How Stuff Works, 15 Dec. Outside of Hairdryer. Inside of Hairdryer. This blog was very interesting. Being a girl with long hair, I use blow dryers all the time and I never thought to look into the science. This was a very good topic choice and something I have not seen before. I liked that you had multiple sources and I thought you did a great job. A resistor resists the flow of electric energy, turning it into heat energy.
In a hair drier, the air blows past the resistor, absorbing heat as it passes. Electric hair dryers work by blowing room temperature air in through the vents. The air then passes over nichrome wire coils that heat it, making it able to blow the hair dry with hot air. The process of air blowing on the hair speeds up water evaporation. Applying power to the hair dryer allows the motor to start spinning the fan inside, and that is what draws the air in through small air holes on the side of the dryer.
Return To Shop. All charges are billed in INR. While the content of your cart is currently displayed in , the checkout will use INR at the most current exchange rate. It uses an electric fan to blow air across a heating coil; as the air passes through the dryer it heats up.
When the warm air reaches wet hair it helps evaporate the water. Hair dryers may be used with a variety of brushes and combs to achieve different hair styles. The first handheld hairdryer appeared on the market in It produced only watts of heat and therefore did not have sufficient power to dry hair quickly. It weighed over 2 lb 1 kg because it was made of heavy steel and zinc. Over the next 20 years engineers improved the design and managed to triple the heat output, raising it to watts.
By the s, further improvements in electrical technology allowed the production of hairdryers with up to watts of power. In the late s, manufacturers began to focus on improving the safety of dryers.
Early hairdryers were dangerous because if they accidentally came in contact with water they would short circuit and cause an electrical shock. There are hundreds of recorded cases of accidental electrocutions because a hairdryer was dropped into a bathtub or sink full of water while it was being used. In the late s the Consumer Products Safety Commission CPSC recommended guidelines for hair dryer manufacturers to follow that would create safer products.
The power of hair dryers was limited by the electric motors available. As smaller, more efficient motors were developed, greater airflow and greater heat output could be chieved. By the s portable hairdryers could produce over watts of heat. Improvements in plastic technology and the discovery of new insulating materials made possible a new generation of lightweight hairdryers.
Modern hair dryers can produce up watts of heat and can dry hair faster than ever before. One of the key factors to consider when designing a portable hairdryer is the amount of heating power it can produce. Since warm air is capable of absorbing more moisture than cold air, the temperature of the airflow is critical. By calculating the specific heat of the air and understanding the maximum temperature that can be used without burning the skin, engineers can calculate the amount of power required for the heating element.
This ensures that the device will generate enough heat to dry the hair quickly. However, it is not enough to simply raise the temperature of the hair; the air must also pass rapidly through the hair for efficient moisture removal.
Therefore, the efficiency of the fan is also a critical consideration. Another key design criteria is the safety of the device. First, the hair dryer must not become so hot that it burns the user during operation. The plastic housing must remain at a comfortable temperature and cannot overheat or else it could melt or catch fire. To solve this problem, engineers have developed temperature cutoff switches that prevent the heating coil from getting too hot.
This cut off switch also turns off the heating coil if the blower motor on the fan stops functioning. Second, the hair dryer must not cause electric shock. A special shock safeguard, A hair dryer and its internal parts. Other factors to consider include the weight of the unit and a user-friendly design.
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