Armfield Engineering Education
HEAT TRANSFER AND THERMODYNAMICS
HT18C Thermo-Electric Heat Pump - Issue 1
Based on a Peltier device, the Armfield HT18C Thermo-electric
Heat Pump demonstrates how electrical power can be used to extract heat
from a cool surface and transfer it to a hot surface.
This effect is becoming widely used for point cooling (e.g. of semiconductor
devices) and small scale volumetric cooling. The HT18C is designed for use
with the Armfield HT10XC Heat Transfer Teaching Equipment.
ORDERING SPECIFICATION
> Small scale accessory designed to demonstrate the use of a Peltier
devic e to transfer heat across surfaces
> Comprises a Peltier device, a heater, and a water-cooled heat exchanger
> Heat transfer rates up to 68 Watt
> Heater power, Peltier drive and cooling flow rate all fully electronically
adjustable under computer control.
> Measurement of cooling water temperatures and flow to allow an overall
energy balance
> The accessory is mounted on a PVC baseplate, which is designed to stand
on a bench and connect to the heat transfer service unit without the need
for tools.
> A comprehensive instruction manual is provided.
> Software is provided.
Technical Details
The thermo-electric Peltier device is positioned in a heat transfer path, between two copper blocks, extracts heat from one block (cold reservoir) and transfers it to the other block (hot reservoir). In order to measure the heat transfer rate, the cold reservoir is fitted with an electric heater, powered by the HT10XC. By varying the electric power into the system, the behaviour of the system at different operating points and temperatures can be established.
The heat extracted is transferred to the hot reservoir, together with heat generated by the electrical supply to the peltier device. This heat is removed by a water-cooled heat exchanger. The flow rates can be adjusted to provide a range of operating temperatures.
The Peltier device can also be used to generate a small quantity of electric power when a temperature difference is applied. This effect can also be demonstrated with the HT18C. Instrumentation is provided to measure the temperatures of the blocks, the electric power supplied to the Peltier device, the cooling water flow rate and the cooling water temperature rise. The heater power is measured by the HT10XC, and so it is possible to establish a complete energy balance for the system.
All facilities are controlled directly from the computer, including heater power, Peltier power and water flow rate. All measured information is available for display and recording on the computer. The HT18C includes its own inte gral USB interface, which connects to the same computer as the HT10XC. The software supplied integrates the data to and from both these interfaces into a simple, user friendly software control environment.
The HT18C derives its power from the HT10XC, and so is protected by the same safety features when used in remote configuration.
Experimental Capabilities
> Performance of a Peltier device as a cooler
> Heat transfer characteristics as a function of temperature and drive
current
> Measurement of the co-efficient of performance
> Energy balance
> Demonstration of a Peltier device as an electrical generator
Essential Equipment
Requires: HT10XC Heat Transfer Service Unit and a PC running Windows 98 or above, with two available USB interfaces.
requirements
Cold Water Supply:
1.5 litres/minute @ 1barg
Electrical Supply:
All electrical requirements are obtained from the HT10XC service unit
NOTE: the supply rating of the HT18C must be the same as the HT10XC that it is used with, i.e.
HT18C-A: 230V/1ph/50Hz
HT18C-B: 115V/1ph/60Hz
HT18C-G: 230V/1ph/60Hz
Shipping specification
Volume: 0.07 m³
Gross weight: 15 kg
Overall dimensions
Height:0.13m
Width: 0.43m
Depth: 0.53m
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