Air Drying Lab Report
Air drying
Introduction :-
Air drying is a method to decrease the moisture content in the air using appropriate method.
The humidity can be removed by-
Lowering the air temperature below the dew point, which condenses the water. That is why this is called condensation method. This can be seen, when we remove a chilled drink from a fidge, so the packaging quickly covers with dew. This happens because the temperature around the package starts falling below the dew point. This method is used in air dryers with a refrigeration system.
Water steam desiccation uses hygroscopic substances is a sorption method. It is used in the form of bags filled with sorbent crystals or balls that are put into PC cases or humidity-sensitive packaging.
Methods
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• Open circuit:- When there is a partial or total exchachange between the dried air and the outside air, mostly used in air-conditioning systems.
Rate of removal of water depend on:-
• Condition of the
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It is a largest scale dryer.
Principle: In this dryer, the materials to be dried are sent to the air heated tunnel for drying purpose. The material is entered at one end and the dried material is colleted at the other end of the tunnel. The outgoing material met the incoming air to ensure maximum drying and the out going air contacted the wettest material so that the air was as nearly saturated as possible.
Fig 2:- Tunnel Dryers
Mechanism:-
Mechanism of action: One of the doors of the tunnel is opened and the materials to be dried are placed to the trolleys and trucks are pushed slowly in the tunnel and then door is closed. Hot air is circulated and passed through the rail truck and perforated trolleys. The hot air then followed are recirculated with the help of fans and the material becoming dried. The moist air is passed out through the exhaust after completion of drying. The door is opened and the trolleys are taken out of the funnel and some new trolleys with the wet materials are introduced into the trucks and the process is
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