The heart of this Refrigerator is a Thermoelectric Cooler Module. Thermoelectric coolers operate by the Peltier effect The device has two ( Hot and Cold ) sides, and when a DC electric current flows through the module, it brings heat from one side to the other, so that one side gets cooler while the other gets hotter. The 'hot' side is attached to a heat sink so that it remains at ambient temperature, while the cool side goes below room temperature.
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A thermoelectric module consists of an array of p- and n-type semiconductor elements that are heavily doped with electrical carriers.The elements are arranged into array that is electrically connected in series but thermally connected in parallel. This array is then affixed to two ceramic substrates, one on each side of the elements.
To make this Refrigerator, you have two options :
1. Buying the Peltier module,Heat Sink and Fans separately
1. Buying the Peltier module,Heat Sink and Fans separately
2. Buying the entire unit which have everything.
After some enquiry, I have settled down to the second option.But if you have some old SMPS fans and CPU
heat sink, then you can choose the first option.
The first and second pictures are downloaded from web for easier understanding.
Credit : http://tetech.com/ and wikipedia