Thermoelectric Cooling

Peltier cells will only cool 40 degrees below ambient. Koolatron Products have a cell whose dimensions are approximately 1" X 1" or slightly larger. Other products also seem to have similar sized cell dimensions. Military applications have stacked two Peltier cells end for end to achieve 80 degree cooling. Power consumption is around 4.5 amps for the Koolatron products. Not very efficent. But does avoid use of refrigerants. Still requires a fan for air movement on heat dissipating fins at hot end.

What about application of a fine mist (for evaporative cooling on the fins of the hot end). Would that theoretically lower the cold side?

Drew

the water has to be distilled or you get mineral build up

If it's a closed loop water system you can use a glycol mixture like your car's radiator fluid.

I have one of the cool boxes similar to those linked in post#1 maybe 12 or 15 litres capacity, bought years ago. It has a single pelter about 30mm square & keeps the contents cool enough on a hot day (in the UK, others may not consider that hot).

A Good try i mst say but it doesn't tell me anything about the dimension of peltier junction used,since i'm making it as a project in my college i need to design accordingly Any way thanks n hope u can tell smthng abt it also.

You didn't tell us you were a student. This falls under the heading of homework, and that's a horse of a different color. (Wizard of Oz)

You should acquire your own information, since we may not be there when you get a real job and have to design something for real.

oooo i'll take care of it well thanks for guiding me thanks buddy :)

For what its worth a 30 mm square Peltier Cell bolts to a 100 mm X 100 mm square heat sink having fins 40 mm deep A corresponding sized heat sink bolts to the other side. I happened to find a Koolatron tossed at the dump to take apart. Later I found the water cooler also tossed out at the dump. The water cooler was a Polar brand and it turns out the problem was a cheap rocker switch for power.

Since this is a college project I guess the goal is to determine how many BTU can be transferred by a given size cell. If you are going to actually build it finding suitable heat sinks may become your biggest challenge. Not to mention expense.

One of our cameras uses 2x 30mm square single stage peltiers on an 85x70x19mm water cooled copper heatsink to get to -40°C. The water is usually run through a chiller.

cameras..??????? really:/

I played around with those a few years ago. I learned a few things.

A). Get an efficient heat sink, and not the cheesy one your mid 90's CPU came with. Those peltier only work as well as you can remove the heat. (and they produce a lot)

B). They suck up a lot of power. I had 3 1.5" units and crowbarred a rack mount power supply. Make sure you have plenty of juice.

I was trying to make an oil cooler but found them to be inefficient. Kudos to making them work, but a regular freezer was the more efficient use of my resources.

thanks i'll take care of it thanks for ur support anyway

Turns out that site is pretty empty, it was a google advertisement link I found. The google links on that site are better than a google search though.

Drew

Thanks it worked

Thanks for ur support good ans