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CE 130 Convection Drying
Education / GUNT Hamburg / Process Engineering / Thermal Process Engineering /

Convection dryers are often used for drying solids in food technology. The CE 130 can be used to investigate and demonstrate the process of convection drying of granular solids.

  Four corrosion resistant removable plates are available for drying the solid. They are put in a drying channel. The plates containing the solid to be dried are exposed to an airflow in the channel. The airflow heats the solid and also removes the quantity of humidty that is released. Air velocity can be adjusted by the speed of a fan. An adjustable heater allows the heating of the air. The transparent door in the drying channel allows the drying process to be observed. A digital balance can be used to follow the changes in weight of the solid due to evaporation or vaporisation of quantity of humidity during operation. The air temperature and the relative humidity of the air are measured and digitally displayed by a single combined temperature and humidity sensor before and after the airflow passes over the solid. A further sensor measures the air velocity.

  The relevant measured parameters (changes in weight, humidity, temperature, air velocity) can be transferred directly to a PC, where they can then be further processed.


  The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.


Learning Objectives / Experiments

- influence of air temperature and humidity on drying

- plotting of drying curves with constant external

- determination of drying rate with different air

  parameters and different solid properties
- evaluation of drying processes using energy and

  mass balances


[1] drier for investigating convection drying of solids
[2] drying on 4 corrosion resistant plates in a drying channel with an airflow
[3] adjustment of air velocity via speed of fan
[4] air heating with controlled heater
[5] digital balance for measuring the change of weight during drying 
[6] 1 combined sensor for measurement of humidity and temperature before and after the solid sample

[7] 1 air velocity sensor
[8] digital stopwatch, battery operated
[9] LabVIEW software for data acquisition via USB under Windows XP or Windows Vista


Technical Data

Drying channel
- length: 2.340mm (with fan)
- internal dimensions: 350x350mm
4 drying plates: 398x320mm
- power: 33W
- max. output: 700m³/h
- max. speed: 950min-1
- power: 0...6.750W
- with adjustable temperature limiter
- measuring range: 0…10.000g
- resolution: 0,1g
Application temperature: 0…60°C

Measuring ranges of sensors
- humidity: 0...100% rel.
- temperature: 0…125°C

- air velocity: 0...2,5m/s


Dimensions and Weight
LxWxH: 2.340x750x1.350mm
Weight: approx. 125kg
Required for Operation

230V, 60Hz/CSA, 3 phase or

400V, 50/60Hz, 3 phase

Scope of Delivery

1 trainer

1 digital balance
1 stopwatch
4 drying plates
1 LabVIEW software CD + USB cable
1 set of instructional material

Order Details
083.13000  CE 130  Convection Drying