TD1002A - Experiment

LINEAR HEAT CONDUCTION EXPERIMENT

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An experimental module to introduce students to the principles of linear heat conduction, and to allow the thermal conductivity of various materials to be measured.

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LINEAR HEAT CONDUCTION EXPERIMENT

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 first brass section includes two thermocouples and the electric heater (heat source). The second brass section includes a small watercooled 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 different 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 flow 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. (Heat loss can also be simply estimated using a pre-determined
TecQuipment chart and table).

  • Demonstration and calculations of linear heat conduction
  • Calculation of the thermal conductivity (k value)
  • Demonstration of the effectiveness of thermal paste
  • Demonstration and calculations of thermal resistances (R value) in series
  • Demonstration of ‘thermal lag’
Case Study
East Tennessee State University Expand Engineering Laboratory Facilities

East Tennessee State University, which has a history of teaching engineering technology dating back to the 1930s, made the decision to expand the course offering in 2015 to include a BSc in General Engineering which combines courses from mechanical, civil and electrical engineering. To teach the course they needed an engineering laboratory that had equipment to practically teach the principles of civil and mechanical engineering. There were existing electrical engineering laboratories, to serve the BSc, in the electrical engineering technology programme. After going out to bid, TecQuipment won, based on a balance between price and functionality of equipment.

Read the full Case Study here.

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