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HL 720 Ventilation System
Education / GUNT Hamburg / Thermal Engineering and HVAC / Heating and Ventilation in Buildings /

In building services engineering ventilation systems are used for commercial premises, hospitals, restaurants or conference rooms to ensure the change of air exchange in the individual rooms. The air is heated or cooled by a heat exchanger.
  HL 720 demonstrates the operation of a ventilation system and its components. The components used are common in commercial ventilation technology and therefore are of high practical relevance. The ventilation system is operated as a pure air supply system.
  The air enters via a weather louvre and flows through the components of the ventilation system, such as multi-leaf damper and filter. Dependent on the operating mode, heating or cooling, the aspirated air is then heated or cooled in a heat exchanger. The heat exchanger is supplied from the laboratory. A fan ensures the air transport. Further down the air duct, typical components, such as sound insulation link, inspection flap, various air outlets and fire protection flap are arranged. 
  Sight windows enable an insight into the sound insulation link, filter and fan. The original component function remains intact. 
  The record of pressures and differential pressures at relevant measuring points enables the representation of a pressure curve for the whole system. The electric drive power of the fan and the air flow are calculated.
  The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.

Learning Objectives / Experiments

- Design and operation of a ventilation system
- Pressure measurements in the air duct
- Determine the electric drive power of the fan
- Determine the flow rate
- Design and operation of components such as
  * protective grating
  * multi-leaf damper
  * filter
  * heat exchanger as air heater/cooler
  * fan
  * inspection cover
  * sound insulation link
  * ventilation grill with adjustable flow rate 
  * fire protection flap
  * ceiling vents

[1] Operation of a ventilation system
[2] All components from ventilation technology, some with sight windows
[3] Protective grating and adjustable multi-leaf damper at the air inlet
[4] Filter for air purification
[5] Heat exchanger to heat/cool the air
[6] Belt-driven radial fan
[7] 2 sound insulation links 
[8] Various air outlets for air distribution in the room: disc valve, ceiling vent and ventilation grill with adjustable flow rate 
[9] Inspection cover for inspection purposes
[10] Fire protection flap prevents the cross-over of fire and smoke in the air duct
[11] Air duct with pressure measurement connections
[12] Pressure measurements with inclined tube manometer 
[13] Current measurement to determine the power consumption of the fan
[14] Determine the flow rate via differential pressure 
Technical Data

Air duct: 1845x630x305mm
- max. flow rate: 2500m³/h
- speed: 1600rpm 
- drive motor: 750W
Air-to-water heat exchanger as air heater/cooler
- capacity: 7.6kW 


Measuring ranges
- pressure: 0...700Pa
- current: 0...4A

Dimensions and Weight
l x w x h: 2100 x 880 x 2050 mm
Weight: approx. 280 kg
Required for Operation
400V, 50Hz, 3 phases or 230V, 60Hz, 3 phases 
Water connection (hot and cold), drainage
Scope of Delivery
1 experimental unit
1 set of instructional material
Order Details
065.72000  HL 720  Ventilation System