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Old 03-31-2013, 02:45 PM   #16
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How easy/hard is it to build your own refrigerator?


see post #2 ...USE THE MINI FRIG...ben sr

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Old 03-31-2013, 07:13 PM   #17
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How easy/hard is it to build your own refrigerator?


didn't see the 32 degree part. what are you going to use it for?
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Old 04-01-2013, 07:54 AM   #18
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How easy/hard is it to build your own refrigerator?


It shouldn't be too hard. Everybody here is thinking compressors and evaporators..., but you can buy solid state cooling modules. Its called the Peltier Effect, when you put power to a semiconductor, one side gets hot, one side gets cold. Do a google search on "solid state cooler".

The solid state cooling module is commonly used on coolers that you can plug into car's cigarette lighter. You could likely buy such a cooler for less than you can make your own, but then you wouldn't be able to say that you built it yourself.

Here is how one fellow did it: http://www.thesurvivalistblog.net/dirt-cheap-fridge/

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Old 04-01-2013, 03:48 PM   #19
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How easy/hard is it to build your own refrigerator?


As long as the temp where he is keeping the cooler is under 82. He may need 2 peltier plates depending on the load he has in the cooler. however, they are not actually efficient at cooling. Which may not be of any concern to the OP.
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Old 04-01-2013, 11:27 PM   #20
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How easy/hard is it to build your own refrigerator?


those cooling plate work but the quickly multiply your electric bill. Been, your list also needs and EPA 608 certification
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Old 04-02-2013, 04:39 AM   #21
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How easy/hard is it to build your own refrigerator?


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Originally Posted by HVAC1000 View Post
those cooling plate work but the quickly multiply your electric bill. Been, your list also needs and EPA 608 certification
Not if he uses R134A.
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Old 04-02-2013, 10:18 AM   #22
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How easy/hard is it to build your own refrigerator?


I looked into this briefly when building a refrigerated computer... basically I disassembled a regular fridge that was lying by the side of the road and VERY CAREFULLY rearranged the evaporator coil into a cooler, and placed the condenser fins below a box fan... a huge contraption. 1/4hp pump to move the subzero temp liquid through the system. It never really worked very well because I couldn't keep the refrigerator from cycling too much... I got it down to like -30*F at one point but that was I assume the lower limits of R12 or whatever refrigerant old fridges use.

Like people said, the mini fridges are very fragile, and have tubing that can NOT be bent, i.e. it's very delicate, and if you move it in the wrong way it will kink and get destroyed.

You also didn't mention what kind of load you were putting on this. If you're growing some rare pitcher plants, then you have no real heat load except for the light bulb... if you are trying to cool a computer, you know you have to calculate the CPU processor + whatever is in that loop and in the end a mini fridge can't keep up with that load. We need more info.

Basically, you can't realistically DIY a small a/c system. You'll spend hundreds of dollars and hundreds of hours. I know I read an a/c text book in that quest, bought the compressor, gauges, an evaporator from the dump... and then gave up. But I had a great time in the quest!

Custom a/c systems are pricey, and very cool, I've seen them in some houses where the condensers were in a remote closet.

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