EMMISSIVITY 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 enclosure with one side glass to ensure steady atmospheric conditions.
- Temperature Sensors are provided to measure the temperature of each plate and surrounding.
- Electric Supply is given to heaters through separate variacs so that temperatures of both can be kept equal and is me asured with Digital Voltmeter and Digital Ammeter.
Experimentation:
- Determination of the Emissivity of a test plate.
- Study the variation of emissivity of test plate with absolute temperature.
| 01. Pipes | |
|---|---|
| a. Diameter | :150 |
| b. Material | :Brass |
| c. Heater | :250W |
| d. Specimen | :Black Body and Grey Body |
| 02.Rectangular Duct | |
| a. Material | :MS with Power Coating Front Acrylic |
| 03. Measuring Instruments | |
| a. Digital Voltmeter Range | :0 to 300 V |
| b. Digital Ammeter & Range | :0 to 10 Amps |
| c. Digital Temperature Indicator with Selector switch | |
| Range | :Ambient to 199.9 Deg. C |
| 04. Thermocouples: | |
| a. Type | :Cr. AI |
| b. Length | :1 Mt. |
| 05. Electronic Dimmer | |
Note: The Unit Is Self-Contained In All Respect Except Water And Power To The Unit
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