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TH780 · Ventilation System

Experimental Apparatus for the Study of Ventilation Systems

A ventilation system built from industrial ventilation components, with a control unit for room temperature control. Students measure the pressures along the air duct, draw the pressure curve of the whole system, measure the electric power of the fan and work out the air flow rate. With the control unit and a hot water supply they control the temperature of the air.
Description
    The TH780 shows how a ventilation system and its components work. It runs as a pure air supply system. Air enters through a weather louvre with a protective grating and flows through the components of the system, the multi-leaf damper and the filter. A fan moves the air. Further along the air duct sit typical components, a sound attenuator, an inspection cover, several air outlets and a fire damper. Sight windows in the air duct show the sound attenuator, the filter, the fan and the multi-leaf damper.

    Pressure tappings at the relevant measuring points let students record pressures and differential pressures and draw the pressure curve of the whole system. The components act as local flow resistances, as they do in real ventilation systems. The system measures the electric drive power of the fan and calculates the air flow rate.

    A heat exchanger in the air duct and a control unit that regulates the air temperature let students run experiments with room temperature control. Quick-release couplings connect the control unit to the ventilation system and to the external hot water source.
Main characteristics
  • ventilation system built from industrial ventilation components
  • pure air supply system with weather louvre, multi-leaf damper, filter, heat exchanger and fan
  • sound attenuators, inspection cover, fire damper and several air outlets along the air duct
  • sight windows into the sound attenuator, filter, fan and multi-leaf damper
  • pressure tappings for the pressure curve of the whole system
  • measurement of the fan drive power and calculation of the air flow rate
  • control unit with circulating pump, 3-way mixing valve and electronic temperature controller
  • quick-release couplings to the ventilation system and to the hot water supply
Learning objectives / experiments
  • design and operation of a ventilation system and of its components
  • pressure and differential pressure measurements along the air duct
  • pressure curve of the whole system
  • measurement of the electric drive power of the fan
  • determination of the air flow rate
  • temperature control of the air flow in a ventilation system
Ventilation system
    Operating environment use in the laboratory
    Power supply 400 V, 50 Hz, 3 phases
    Air duct 2 parts, L × H 612 × 409 mm and 710 × 304 mm
    Fan max. flow rate 2200 m³/h; motor power 1.18 kW
    Measuring ranges pressure −1…25 mbar; effective power 0…1200 W
    Apparatus L 2150 × W 800 × H 1970 mm
    Weight approx. 270 kg
400V
L 2150 W 800 H 1970 mm
270 kg
Control unit
    Characteristics temperature control for the ventilation system
    Power supply 230 V, 50 Hz, 1 phase
    Components circulating pump; 3-way mixing valve; electronic controller with temperature sensor and setpoint adjustment; 3 thermometers, 0…120 °C; 1 temperature sensor with display, −50…600 °C; quick-release couplings to the hot water supply and to the ventilation system
    Pump power consumption 44 W; max. flow rate 83 L/min; head 6 m
    Apparatus L 1050 × W 700 × H 1580 mm
    Weight approx. 65 kg
230V
Water Supply
L 1050 W 700 H 1580 mm
65 kg
Scope of delivery
  • 1 ventilation system on a frame, with air duct and pressure tappings
    • weather louvre with protective grating, multi-leaf damper, filter and heat exchanger
    • fan with electronically commutated motor and effective power measurement
    • 3 sound attenuators, inspection cover and fire damper
    • air outlets: disc valve, ceiling vent and ventilation grille with adjustable flow rate
  • 1 hand-held pressure meter
  • 1 control unit with circulating pump, 3-way mixing valve, electronic controller, 3 thermometers and temperature sensor with display
  • 1 set of hoses with quick-release couplings
  • 1 set of instructional material

All components and accessories listed under Scope of delivery are supplied, whether or not they are visible in the illustrations.

Required for operation
  • 400 V, 50 Hz, 3 phases, for the ventilation system
  • 230 V, 50 Hz, 1 phase, for the control unit
  • hot water supply, 1 bar, 2000 L/h
  • cold water connection and drain