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HTL-01

INTRODUCTION

“EEE” Thermal Conductivity of Insulating
Powder apparatus is designed to determine thermal conductivity of insulating powders, by assuming unidirectional radial heat conduction across the powder.
The apparatus consists of two thin walled concentric copper spheres. The inner sphere houses Nichrome heating coil and insulating powder is packed between two spheres. Chromel
Alumel Thermocouples are embedded on the
spheres to measure the temperature at various positions.

FEATURES

1. Sphere in Sphere arrangement for radial unidirectional heat flow.
2. Ten thermocouples to measure surface temperatures of spheres.
3. Digital Temperature Indicator.

RANGE OF EXPERIMENTS

1. Determination of thermal conductivity of insulating powder.
2. Comparison of thermal conductivity at various temperatures.

SPECIFICATIONS

1. Inner sphere diameter 100 mm.
2. Outer sphere diameter 200 mm.
3. Heater Nichrome wire sandwiched between mica sheets .
4. Control Panel Comprising of
a) Voltmeter : Digital, 0 to 200 V.
b) Ammeter : Digital, 0 to 2 Amp.
c) Dimmerstat 0 to 230 V / 2 A.
d) Multichannel Digital Temperature Indicator. 0-300 C with 1 C least count using chromel alumel thermocouples provided with cold junction compensation.
e) Ten Chromel Alumel Thermocouples embedded on inner and outer spheres.

INSTRUCTION MANUAL

A manual is supplied which gives details of the apparatus and procedure of experiments along with sample calculations.

SERVICES REQUIRED

AC. 230 V Single phase stabilised supply with earthing connection.
Space : 0.5 m x 0.5 m approximately at working height.

HTL-02

DESCRIPTION

The apparatus consists of a metal bar whose one end is heated by an electric heater & the other end is kept in a
cooling water chamber, which acts as heat sink. The test section, i.e. middle portion of bar is provided with
thermocouples. Test section is well insulated to minimise radial heat loss.

EXPERIMENTATION

Determination of temperature distribution along the length of given bar.
Determination of thermal conductivity of given bar at different temperatures
Determination of thermal conductivity of any metal bar other than the supplied one by proper fitting of bar in the unit.

SPECIFICATIONS

01) Metal bar of copper , 25 x 440 mm length (approx.)
02) Thermal Insulation for bar.
03) Cooling water chamber 75 mm dia , 125 mm length.
04) Control Panel Comprising of Panelised electrical instruments. Digital Temperature Indicator./
voltmeter / ammeter / dimmer .
05) Stop clock , and measuring flask
06) Heater- 400 watts (Band Type)
07) Digital Voltmeter
08) Digital Ammeter
09) Dimmerstat : 0- 230 volts , 2 A
10) Digital Temperature indicator 0-3000 with10 L.C. using cr-Al thermocouples, cold junction
compensation.
11) Eight thermocouples on bar at equidistant points.

SPACE REQUIRED

2 mtr x 1.5 mtr approximately.

INSTRUCTION MANUAL

A manual is supplied which gives details of the apparatus and procedure of experiments along with sample calculations.

SERVICES REQUIRED

1. A.C. 230 V single phase stabilised supply with earthing connection.
2. Constant temperature cooling water supply constant head at the rate of
about 1-2 liters/ min