AFT111 Laws of Radiant Heat Transfer/ Heat Exchanger Module Didactic Equipment Heat Transfer Demo Equipment
Features • A self-contained benchtop unit to demonstrate the laws of radiant transfer • Simple to use and needs no tools: all interchangeable parts fit 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 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 diff erent optical filters for extra experiments in light transfer Learning Outcomes Heat: • Inverse square law (or Lambert's distance law/area law), demonstrating radiation is inversely proportional to distance squared • Stefan-Boltzmann law, demonstrating the relationship between radiation and source temperature • Kirchhoff's law, demonstrating that a body with good emissivity also has good absorptivity • Area factor, demonstrating that radiation transfer depends on the exposed area of the radiant source Light: • Inverse square law (or Lambert's distance law/area law), demonstrating radiation is inversely proportional to distance squared • Lambert's direction law (or cosine law), demonstrating that radiation is proportional to the cosine of the angle between the emitter and the receiver • Transmittance and absorbance, demonstrating 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. 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 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. 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. This gives accurate real-time data capture, monitoring and display, calculation and charting of all the important readings on a computer (computer not included). Operating Conditions Operating environment: Laboratory Storage temperature range: –25°C to +55°C (when packed for transport) Operating temperature range: +5°C to +40°C Operating relative humidity range: 80% at temperatures < 31°C decreasing linearly to 50% at 40°C Essential Services Bench Space: Approximately 1500 mm wide x 500 mm front to back, plus space for a computer Electrical Supply: 100 VAC to 240 VAC 50 Hz to 60 Hz - Heat source: 200W ceramic heater; Ø100mm black plate(Near 1.0 emissivity) - At maximum voltage plate can reach upwards of 300"C - Light source: 40W bulb, glass diffuser. 180 rotation
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