This is a basic unit for studying of tray drying by hot air.
The unit consists of a rectangular duct. Air is drawn into the duct by an axial flow fan at the front end of the duct. Fan speed is adjustable. A bank of electric heaters behind the fan raises air temperature. Behind the heater is a drying compartment with transparent access door. A rack of trays is suspended from a balance above the duct. Temperatures and humidity before and after the drying trays are measured.
- Tray drier drying curves.
- Effect of particle size.
- Effect of air velocity.
- Effect of air temperature.
|. Drying section||: 350 x 350 mm.|
|. Air velocity||: 0.3 – 1.8 m/s.|
|. Heater capacity||: 3 kw, variable.|
|. Trays||: 4 ea stainless steel.|
|. Tray capacity||: 3 kg of solids (approx.)|
|. Measuring instruments|
|- Digital balance||: 1 ea.|
|- Anemometer||: 1 ea.|
|- Thermo-hygrometer||: 1 ea.|
|. Power supply||: 220V 1Ph 50 Hz. Other power supply is available on request.|