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WL 377 Natural Convection and Radiation Apparatus
Education / GUNT Hamburg / Thermal Engineering and HVAC / Fundamentals of Thermodynamics /

This unit enables a broad range of experiments to be performed on the transfer of heat in gases. At raised pressures the energy is primarily transported by convection, while at low pressures the energy is transferred by radiation.

  An electrically heated metal cylinder is fitted inside a pressure vessel that can be evacuated. Low pressures down to 1Pa absolute are generated using the vacuum pump fitted.

  Gauge pressures up to 1bar can be obtained by using an external compressed air connection. It is also possible to investigate heat transfer in other gases, e.g. nitrogen, helium or carbon dioxide.

  The heating capacity is adjustable and is measured via the voltage and current. The surface temperatures of the heating element and the vessel wall are displayed. The pressure measurement is made using a piezoelectric pressure sensor. At very low pressures a Pirani manometer is used.

 The measured values can be read on digital displays. At the same time, the measured values can also be transmitted directly to a PC via USB. The data acquisition software is included.

Learning Objectives / Experiments

- Heat transfer by convection at atmospheric pressure 

- Heat transfer by convection at raised pressures (p above atm. max. 1bar)

- Heat transfer by radiation at low pressures (vacuum)

- Heat transfer by radiation and convection at intermediate pressure


[1] Apparatus on heat transfer by convection and radiation in gases
[2] Temperature controller

[3] Vacuum pump

[4] 2 temperature sensors
[5] Pressure measurement using Pirani manometer
[6] Pressure measured by pressure sensor
[7] Digital displays for temperature, pressure, voltage, and current
[8] Operation with different gases possible

[9] LabVIEW software for data acquisition via USB under Windows XP or Windows Vista


Technical Data

Heater: 20W
Radiation surfaces

- heater sleeve: 55cm²

- vacuum vessel: inner sleeve: 0,2m²
Vacuum pump

- power: 370W

- nominal suction capacity: 6m³/h
Pressure range: 10-5...2bar absolute

Measuring ranges 
- pressure below atmospheric: 0,1...1000Pa

- pressure: -1...1,5bar rel.

- temperature: 0...200°C
- power: 0...20W


Dimensions and Weight
l x w x h: 1340x790x1500mm
Weight: approx. 115 kg
Required for Operation
230V, 50/60Hz, 1 phase or 120V, 60Hz, 1 phase
Compressed air: 1.5bar
Scope of Delivery

1 experimental unit

1 LabVIEW software CD + USB cable

1 manual

Order Details

060.37700  WL 377  Natural Convection and Radiation Apparatus