Armfield Engineering Education
HEAT TRANSFER AND THERMODYNAMICS
HT12 Radial Heat Conduction
HT12C Computer Controlled Radial Heat Conduction - Issue 1
The Armfield Radial Heat Conduction accessories have been designed to demonstrate the application of the Fourier Rate equation to simple steady-state conduction radially through the wall of a tube. The arrangement, using a solid metal disk with temperature measurements at different radii and heat flow radially outwards from the centre to the periphery, allows the temperature distribution and flow of heat by radial conduction to be investigated.
On the HT12C the heater power and the cooling water flow rate are controlled via the HT10XC, either from the front panel or from the computer software. On the HT12 these are controlled manually.
Right: HT12C Computer Controlled Radial Heat Conduction Accessory
shown with the HT10XC - Service Unit
Ordering Specification
• A small scale accessory to introduce students to the principles of radial heat conduction, and to allow the conductivity of a solid brass disk to be measured
• Comprises a brass disk with a heater at the centre and a cooling water tube attached to the periphery.
&• Six thermocouples measure the temperature gradient between the heated centre and the cooled periphery of the disk.
• Thermally insulated to minimise errors due to heat loss.
• HT12 includes a water pressure regulator and a manually operated valve to control the flow rate.
• HT12C includes an electronic proportioning solenoid valve to control the cooling water flow rate, a pressure regulator and a water flowmeter.
• Heater power variable up to 100 Watts.
• Water flow rate variable up to 1.5 litres/ minute.
• Conduction disk is 110mm diameter and 3.2mm thick.
Experimental Capabilities
> Understanding the use of the Fourier Rate Equation in determining rate of heat flow through solid materials.
> Measuring the temperature distribution for steady-state conduction of energy through the wall of a cylinder (radial energy flow).
> Determining the constant of proportionality (thermal conductivity k) of the disk material.
Technical Details
The accessory comprises a solid disk of material which is heated at the centre and cooled at the periphery to create a radial temperature difference with corresponding radial flow of heat by conduction.
Six K-type thermocouples are positioned at different radii in the heated disk to indicate the temperature gradient from the central heated core to the periphery of the disk. The radial distance between each thermocouple in the disk is 10mm. Quick-release connections allow rapid connection of the cooling tube to a cold water supply. A pressure regulator is incorporated to minimise the effect of fluctuations in the supply pressure. A control valve allows the flow of cooling water to be varied, if required, over the operating range of 0 -1.5 litres/min. The cooling water flowrate is measured by a turbine type flow sensor (HT12C only).
Accessories
Essential Armfield Accessories
HT12C requires HT10XC Computer Controlled Heat Transfer Service Unit.
HT12 requires either HT10XC or HT10X Heat Transfer Service Units.
Requirements
Cold water supply: 1.5 litres/min @ 1 Barg.
All electrical requirements are obtained from the service unit.
Shipping Specification
H12
Volume: 0.03 m³
Gross Weight: 5 kg
H12C
Volume: 0.04 m³
Gross Weight: 6 kg
Overall dimensions
H12
Height: 0.19 m
Width: 0.35 m
Depth: 0.18 m
H12C
Height: 0.19 m
Width: 0.43 m
Depth: 0.18 m
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