Is it necessery to put air dryer in pneumatic system?
Yes, if the downstream instruments or equipment is sensitive to moisture. Air is heated when it is compressed. As the air cools liquid moisture condenses out. In addition to an air dryer, a manual or timed automatic tank drain is usually installed to periodically drain trapped moisture in the receiver or tank.
A hair dryer is actually not a good example of a pneumatic system. A pneumatic or hydrologic system uses fluid (gas or liquid) to transfer force over a distance. Hair dryers lack almost all components found in a pneumatic system. The internal operation of a hair drier is simple, a fan creates a high pressure air pocket on the heating element, and this high pressure air pocket cause air to be sucked in the back…
The brakes of an 18 wheeler has a pneumatic system. Any system needs redundancy in work needs pneumatics, because the compressor of the pneumatic system has a periodcal operations (intermittent work, not as hydraulic pump). the compressed air could be accomulated in tanks with high pressures and used even if the compressor failed.
Pneumatic systems rely air pressure to cause something to move. One simple example is the tyres of a car. Air pressure raises the car from the roadway. Dentist drills are pneumatic; electricmotors are too big and heavy. Road drills are pneumatic; they are very simple and more powerful than an electric drill.
Other than breathing, air is used for: 1. Inflating tires on many vehicles (that's what "pneumatic" means in pneumatic tire) 2. Driving power tools (e.g. the "air wrench" used by an auto mechanic). 3. Dusting delicate electronics (the "canned air"). 4. Drying your hair (a blow dryer). 5. Keeping you warm (pockets of air in the fabric of clothing and blankets trap heat).
In 1650, Guericke invented the first air pump. It could produce a partial vacuum and Guericke used it to study the phenomenon of vacuum and the role of air in combustion and respiration. The best known pneumatic device is of course the pneumatic tube. A pneumatic tube is a method of transporting objects using compressed air. In the past, pneumatic tube was often used in large office buildings to transport messages and objects from office…
A pneumatic thermostat is one that controls the air handling system by using an air-filled control tube to send signals. Pneumatic thermostats typically use a bi-metallic strip that responds to temperature changes, and correspondingly increases or decreases the air pressure in the control tube. Separate components within the air handling system respond to the pressure changes in the control tube to activate heating or cooling to occur through the ductwork. http://www.dr-fix-it.com/pneum1.html
Pneumatic is air pressure in a container. Like a Tire. Bar is is a pressure measuring system, usually meaning multiples of atmospheric air pressure at sea level. The Bar system can be used to state the pressure at the centre of the sun so has no realistic limit. Saying Pneumatic bar is just confusing.