Describe The Working Of A Thermoelectric Refrigerator ?
The working of thermo-electric refrigerator is based on pettier effect. According to pettier effect, if current is passed through a thermocouple heat is absorbed at one junction and evolved at the other junction of the thermocouple. If on the whole the heat is a boarded, the thermocouple acts as thermoelectric refrigerator. Such a refrigerator has no muter or compressor. Its efficiently is small in comparison to congenital refrigerator. Thermo electric refrigerator is very useful when the region to be cooled is very small and the noise is not acceptable. The thermocouple selected for the use of thermoelectric refrigerator should have the following characteristics. Low resistivity so that the loss of energy in the form of joule heat is minimum. Low thermal conductivity it will help in maintaining large temperature difference between the two junctions. High thermo electric power.
