AFT109 Linear Heat Conducton Module Educational Equipment Heat Transfer Experiment Equipment
Features • One of four optional experiments for the Heat Transfer Experiments Base Unit • Fits quickly and easily onto the Heat Transfer Experiments Base Unit and water connections have self-sealing quick connectors needing no tools • Shows the principles of linear heat conduction along a rod of uniform diameter • Clear schematic printed on the baseplate aids student understanding • Allows the thermal conductivity of various materials to be measured • Safe, low-voltage heater with over-temperature cut-out Description This experiment has a solid brass bar of circular crosssection, made in two sections with an interchangeable middle section. It mounts on a base plate with a clear schematic of the experiment layout. The fi rst brass section includes two thermocouples and the electric heater (heat source). The second brass section includes a small water cooled chamber (heat sink) and two more thermocouples. The interchangeable middle sections (supplied) are of different metals: • Brass, so the bar becomes one length of brass • Aluminium • Stainless steel • Copper Each middle section has three thermocouples to enable the calculation of thermal conductivity of specimens using two diff erent methods: • The absolute method • The comparative cut-bar method The electric heater and thermocouples connect to sockets on the Heat Transfer Experiments Base Unit, which also supplies the cold water feed and drain for the heat sink. Students turn on the cooling water fl ow and adjust the heater power until the experiment reaches equilibrium they then record the temperatures as the heat conducts along the bar. Insulation around the bar reduces heat loss by convection and radiation, so that the results should be close to the theory for simple linear conduction only. Learning Outcomes • Demonstration and calculations of linear heat conduction • Calculation of the thermal conductivity (k value) • Demonstration of the eff ectiveness of thermal paste • Demonstration and calculations of thermal resistances (R value) in series • Demonstration of 'thermal lag' Essential Base Unit • Heat Transfer Experiments Base Unit 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 - Heated Section. Material: Brass, Ø25mm. - Cooled Section. Material: Brass,Ø25mm. -Brass Intermediate Specimen: Ø25mm x 30mm long. -Stainless Steel Intermediate Specimen: Ø25mm x 30mm long. - Aluminium Intermediate Specimen:Ø25mm x 30mm long. - Reduced Ø Brass Intermediate Specimen: Ø13mm x 30mm long
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