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CAT NO: DIDACTICHeat Equipments0008
Emissivity Measurement Apparatus.
Emissivity Measurement Apparatus
The present Set-up is designed to measure the emissivity of test
plate
The test plate comprises of a mica heater sandwiched between two
circular plates. Black plate is identical with test plate, but its
surface is blackened. As all the physical properties, dimension and
temperature are equal; heat losses from both plates will be same except
radiation loss. Hence the input difference will be due to difference in
emissivity. Both plates are supported on individual brackets in a wooden
enclosure with one side glass to ensure steady atmospheric conditions.
Temperature Sensors are provided to measure the temperature of each
plate and surrounding. Supply is given to heaters through separate
variacs so that temperatures of both can be kept equal and is measured
with Digital Voltmeter and Digital Ammeter.
Experiments
Determining the Emissivity of a test plate.
Study the variation of emissivity of test plate with respect to absolute temperature.
Utilities Required
Electricity Supply: 1Phase, 220 VAC, 4 Amp.
Table for set-up support
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