The apparatus is constructed using two M.S. plates, Bakelite, brass, and aluminum, which are arranged sequentially on either side of a central heater to form a composite wall. This assembly is securely mounted within a sturdy frame and is clearly visible through a transparent Perspex sheet, allowing easy observation. Thermocouple tapings are strategically placed to enable accurate measurement of thermal conductivity and resistance across the composite wall layers.

Experimental Objective

Evaluate the overall thermal resistance and conductivity of the composite wall.

Plot the temperature gradient across the composite wall.

Specifications

·        Mica heater with a 250 mm diameter.

·        Two mild steel (M.S.) plates, each 25 mm thick and 250 mm in diameter.

·        Two Bakelite plates, each 10 mm thick and 250 mm in diameter.

·        Two brass or aluminum plates, each 15 mm thick and 250 mm in diameter.

·        2 A dimmer stat for precise power control.

·        Voltmeter and ammeter for input power measurement.

·        Multichannel digital temperature indicator to monitor temperatures at multiple points.

·        Comprehensive technical manual included 

Utilities Required Other than above Supply

230 V AC stabilized power supply with proper earthing.

Bench space required: 1 m × 1 m × 0.5 m (height).