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Thermoelectrial refrigeration and heating
INTRODUCTION |
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An introduction to the concept of thermoelectric cooling and heating can be made by comparing it to thermocouples. used when measuring temperature in a refrigeration or air conditioner laboratory, for example. In a thermocouple, the junction of two wires of dissimilar metals is placed in contact with the surface where the temperature is to be measured. As a change in temperature takes place, a small voltage is generated and, through the use of a potentiometer. the temperature is measured.
Thermoelectric cooling (and heating) works in the reverse manner. Instead of a temperature change generating a voltage, a voltage is supplied to bring about a temperature change. The thermoelectric device can be used for cooling or heating, much like the way the vapor -compression cycle can be reversed in a heat pump, with which we are perhaps more familiar.
In the former case of temperature measurement, thermoelectric generation is based on a phenomenon discovered by Thomas Seebeck, a German physicist, in 1821. He found that an electrical current is produced in a closed circuit of two dissimilar metals if the two junctions are maintained at different
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