Trolley-mounted, mobile apparatus that demonstrates how different types of heat can transfer over a range of pressures; helps the understanding of the Stefan Boltzman constant.

Key Features:

• Includes TecQuipment’s Versatile Data Acquisition System (VDAS®) Onboard
• A self-contained, mobile, compact unit for ease of use and storage
• Helps students to understand natural ‘free’ convection, radiation, emissivity and the StefanBoltzman equation
• Includes a pressure vessel to allow tests above and below atmospheric pressure
• All instruments and vacuum pump included
• Test results are accurate enough to allow extrapolation down to a complete vacuum

Description:

•  The Natural Convection and Radiation equipment allows the study of heat transfer at different pressures and vacuum .
• It shows the differences between radiation and natural ‘free’ convection. It allows students to find the emissivity of a surface and verify the Stefan-Boltzman
  equation.
• It also gives students an understanding of the non-dimensional characteristics using Nusselt, Grasof, Prandtl and Knudsen numbers.
• A small heated element hangs in the center of a pressure vessel. The heater has a matt black surface. Attached to its surface is a thermocouple to measure the temperature.
• A small heated element hangs in the center of a pressure vessel. The heater has a matt black surface. Attached to its surface is a thermocouple to measure the temperature.
• The vessel may be charged with compressed air up to 1 bar (gauge) or evacuated down to approximately 5 Pa (absolute).
• Students can extrapolate the results down to a total vacuum (no convection). This allows them to isolate the heat transfer by radiation.
• Instruments and a digital display measure and display the temperatures, pressures and power to the element. Instruments and a digital display measure and display the temperatures, pressures and power to the element. 
• Included is a vacuum pump, and a regulator for an external compressed air supply.

Learning Outcomes:

• Determination of emissivity
• Verification of the Stefan-Boltzmann constant

Experiment request:

• For tests with pressures above atmospheric, you also need an external supply of clean, dry compressed air at between 1.5 bar and 10 bar (not supplied)