(Radiant Transfer Experiments)

Key Features:

•  A self-contained bench-top unit to demonstrate the laws of radiant transfer
• Simple to use and needs no tools – all interchangeable parts fit and slide on an
  aluminum frame. A separate box includes controls and displays of experiment readings.
• Uses a safe, low-voltage heat source and thermopile (heat flux sensor) for radiant heat transfer experiments
• Includes plates of different heat absorption properties and apertures for extra experiments in heat transfer
• Uses a safe, low-voltage ‘integrating sphere’ light source and lux meter (light meter) for light transfer experiments
• Includes different optical filters for extra experiments in light transfer

Description:

•  The equipment has two parts; an aluminium Experiment
  Frame and a Control Box. The frame holds all the
  experiment parts and allows the user to slide the parts
  along easily for experiments of transfer over distances. The
  Control Box contains the electrical controls and displays of
  the measured readings.
• The heat source uses a variable low-voltage electric
  heater on a flat plate, creating a black body heat source
  of variable temperature. A thermocouple measures
  the heat source temperature. A moveable thermopile
  measures the heat radiation from the heat source at
  varying distances. TecQuipment include plates with
  different apertures, surface finishes and thermocouples.
  They allow extra experiments that show how surface finish
  affects emissivity and absorptivity, and the area factor for
  heat transfer
• The light source uses a low voltage lamp inside an
  integrating sphere to create a diffuse light. Students can
  rotate the light source through a range of angles (shown
  on a protractor scale) for experiments in light direction. A
  moveable Lux Meter measures the light radiation from the
  light source at varying distances. TecQuipment includes
  different optical filters (coloured, neutral density and
  infra-red block). They allow extra experiments that show
  how optical filters affect light transfer.
• A clear, multiline digital display on the Control Box shows
  temperatures and light or heat radiation

Learning Outcomes:

• Heat
  • Inverse square law (or Lambert’s distance law/area law) – showing radiation is inversely proportional to distance squared
  • Stefan-Boltzmann law – showing the relationship between radiation and source temperature
  • Kirchhoff’s law – showing that a body with good emissivity also has good absorptivity
  • Area factor –showing that radiation transfer depends on the exposed area of the radiant source
• Light:
  • Inverse square law (or Lambert’s distance law/area law) – showing radiation is inversely proportional to distance squared
  • Lambert’s direction law (or cosine law) – showing that radiation is proportional to the cosine of the angle between the emitter and the receiver
  • Transmittance and absorbance – showing that optical filters can reduce light intensity