Demonstrates the laws of radiant transfer from heat and light sources.
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 fi t and slide on an aluminium frame. A separate box includes controls and displays of experiment readings.
• Uses a safe, low-voltage heat source and thermopile (heat fl ux sensor) for radiant heat transfer experiments
• Includes plates of diff erent 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 diff erent optical fi lters for extra experiments in light transfer
• Can connect to TecQuipment’s Versatile Data Acquisition System (VDAS®)
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 fi lters can reduce light intensity
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 user fi ts diff erent parts to the frame to measure the radiant transfer from light and heat sources.
The heat source uses a variable low-voltage electric heater on a fl at 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 diff erent apertures, surface fi nishes and thermocouples. They allow extra experiments that show how surface fi nish aff ects 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 diff use 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 diff erent optical fi lters (coloured, neutral density and infra-red block). They allow extra experiments that show how optical fi lters aff ect light transfer.
A clear, multiline digital display on the Control Box shows temperatures and light or heat radiation.
You can do tests with or without a computer connected. However, for quicker tests with easier recording of results, TecQuipment can supply the optional Versatile Data Acquisition System (VDAS®). This gives accurate realtime data capture, monitoring and display, calculation and charting of all the important readings on a computer (computer not included).
Recommended Ancillaries
• VDAS-B (bench-mounted version of the Versatile Data Acquisition System)
