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WL 312 Multipurpose Air Duct and Heat Transfer Unit
Education / GUNT Hamburg / Thermal Engineering and HVAC / Applied Thermodynamics /

The trainer comprises an insulated duct through which air is drawn with the aid of a fan. The airflow generated is homogeneous due to a specially shaped inlet area. Different heat exchanger elements can be inserted in the duct: plain tubes (WL 312.01), finned tubes (WL 312.02), direct expansion coil (WL 312.03).
  Velocity distributions and pressure loss are measured with a Pitot tube and an inclined tube manometer. Temperature and humidity sensors are included. The following accessories are recommended for supplying the heat exchanger: hot water bench (WL 312.10), cold water bench (WL 312.11), condensing unit (WL 312.12).

Learning Objectives / Experiments

Experiments without accessories
- Recording the fan characteristic curve
- Velocity distribution in the duct


Experiments with accessories
- Measurement of pressure loss along the duct 
  (HM 170.50)
- Heat transfer at plain tubes (WL 312.01, together 
  with WL 312.10 / WL 312.11)
- Heat transfer at finned tubes (WL 312.02, together
  with WL 312.10 / WL 312.11)
- Heat transfer at a direct expansion coil 
  (WL 312.03, together with WL 312.12)


[1] Air duct for the investigation of the heat transfer in airflows
[2] Use of different heat exchangers in the air duct
[3] Insulated air duct with flow straightener

[4] Radial fan with adjustable flow rate
[5] Pitot tube with inclined tube manometer to measure velocitiy distribution and pressure loss
[6] Pressure sensor, combined temperature and humidity sensor
[7] Switch cabinet with digital displays


Technical Data

Air duct cross-section: 150x300mm
- power: 900W
- max. flow rate: 1680m³/h
- max. pressure difference 1000Pa
- nominal speed: 2840min-1
Pitot tube: travel 300mm
Inclined tube manometer: 0...100Pa
Sensor measuring ranges

- temperature: 2x 0...50°C
- humidity: 2x 100% rel. humidity
- pressure: 2x 0...10mbar


Dimensions and Weight
LxWxH: 2310x750x1800mm
Weight: approx. 150kg
Required for Operation
230V, 50Hz, 1 Phase
Scope of Delivery

1 trainer

1 manual

Order Details
060.31200  WL 312  Multipurpose Air Duct and Heat Transfer Unit