Simple Peltier Refrigerator

In this post we learn a straightforward procedure for building a simple refrigerator using Peltier device for generating the required cooling effect inside the fridge.

How Peltier Device Works

We are all familiar with a Peltier device and know how it functions.

Basically it works on the principle of thermo-electric effect (opposite of Seebeck Effect) where a potential difference is used for making or producing hot and cold temperatures over the two ends of a dissimilar metal assembly.

A Peltier device has two terminals in the form of wire ends which requires to be connected across a voltage source rich in current content.

The application of voltage instantly starts transforming one surface of the unit hot and the reverse surface cool very fast.

However, the hot end must be quickly managed so that the heat does not reach higher levels, which can completely hamper the heating and cooling process and ruin the device itself.

Therefore the hot surface must be attached with heavy heatsinking materials like aluminum or copper metal of suitable sizes.

How to Build a Simple Fridge using Peltier Device


The simple construction of a simple peltier refrigerator circuit shown in the figure demonstrates the above discussed set up where two such devices are appropriately fixed with aluminum plates for radiating different degrees of temperatures from their relevant sides.

The plates responsible for generating the cooling effects must be trapped inside a well insulated enclosure made up of thermocole or polyurethane foam etc.

The inside chamber may be used for storing water bottles or water packets as desired.

The hot heatsinked surfaces must be exposed in the outside air for radiations and for controlling the temperatures of "hot" ends of the unit, see figure.

Complete diagram for understanding How to Make a Simple Peltier Refrigerator at Home.

Simple mini refrigerator using Peltier device


Fan with Heatsink

The ideal heatsink suitable for this application is the one which has an attached fan with it. The fan helps to dissipate the heat quickly from the core area, and distribute it evenly across the entire heatsink.



How to Test a Peltier Device: Video Demo

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Comments

Swagatam said…
Hello Kushal,

Please explain your requirement more elaborately,

....what is off mode?
dear sir,
please i am out of topic and i really want to build this for my home use where i live, i want to ask, how many volts DC can this fridge work with, then the most important equipment i will ask you is, what is the name of the part that is between the cooling heat-sink and the cooling box, i have never come accross a Peltier before, please if you can help me i will really appreciate it sir i am in need of your help, my email address is (dnkwenti@gmail.com)
have a nice day sir.
Swagatam said…
Dear Deogratia,

The power input will depend on thre Peltier device rating (watts) that you may want to use for your application.

Google "how Peltier device works" and you'll come across many good sites with detailed info...it's important that you learn everything before trying this concept.

waagyi said…
Dear sir, I am one of your readers. I want to read a post on home made peltier device. Your projects are really valuable for your readers.
Swagatam said…
Thanks Waagyi, I have already explained the concept in the above article, please go through it.....

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