The Stefan-Boltzmann constant plays a vital role in heat transfer calculations, and this apparatus is specifically designed to determine its value experimentally. The setup consists of a hemispherical enclosure surrounded by hot water, which is supplied from a separate water heating tank. When a blackened disc is placed at the center of the hemisphere, its temperature begins to rise due to the thermal radiation it absorbs from the heated hemisphere. The temperature of the disc is recorded at 5 second intervals, allowing for the calculation of the Stefan-Boltzmann constant based on the observed heat transfer.

Experimental Objective 

study of the thermal radiation and Determination of Stefan Boltzmann

determine Stefan Boltzmann’s constant

determine radiative heat transfer coefficient

Specifications 

·        Water heating tank fitted with an electric immersion heater.

·        Copper hemisphere, 200 mm diameter, enclosed within a 250 mm diameter water jacket.

·        Copper test disc, 20 mm diameter, with a centrally placed thermocouple.

·        Multichannel digital temperature indicator (0–200°C) with 0.1°C resolution for measuring disc and hemisphere temperatures.

·        Built-in audible buzzer with a timer that sounds every 5 seconds.

·        Comes with a comprehensive technical manual.

Bench space approximately 1m x 0.5m at standard height.