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HL 720


Technical Description

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 volumetric air flow rate 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


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