# Phase Change Cooler

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#### Frosty_47

##### New Member
Hello,

The hot summer days are here and I want to build a compressor cooled portable cooler for camping so that me and my buddies can have cold beer for 2+ days. I have a hefty battery pack with build in-inverter that can be used to power the compressor. My only problem is finding a very tiny and lightweight compressor. The rest is simple...

Oh I tried using thermal-electric couples but the efficiency of them is very low, plus you need a giant heat spreader to cool them. So compressor sounds like a better choice.

If anyone know where I can get a small compressor, please provide a link...

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#### tcmtech

##### Banned
Try surpluscenter.com Or strip one out of an old window AC unit or a freezer or refrigerator or a dehumidifier. All of them have small efficient compressor units that are easy to rework into something else! Hit a few garage sales and see what you can find!

#### Frosty_47

##### New Member
Try surpluscenter.com Or strip one out of an old window AC unit or a freezer or refrigerator or a dehumidifier. All of them have small efficient compressor units that are easy to rework into something else! Hit a few garage sales and see what you can find!

Nah i need something much smaller than that. I already thought of all those things. All of those units have very large compressors. Though a simpler solution might be to just find a small bar fridge and take that along. They are very efficient and it saves me the trouble of having to connect an evaporator, condenser, and other crap...

Oh, and I just love how people are no longer surprised of craziness here. I mean surely you see a lot of people going camping with a cooler that has built in phase change system.

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#### kchriste

##### New Member
Forum Supporter
Look into an absorption type fridge which runs on propane. They do make portable ones but a new one would be expensive:
https://www.electro-tech-online.com/custompdfs/2009/06/rc4000-specs.pdf
You could scavenge one from an old RV, but be careful about mixing beer and homemade propane devices.
Or you could find a cold mountain stream just like you see in the beer commercials! Remember to pick up your empties after picking up the babes.

#### Frosty_47

##### New Member
Look into an absorption type fridge which runs on propane. They do make portable ones but a new one would be expensive:
https://www.electro-tech-online.com/custompdfs/2009/06/rc4000-specs-1.pdf
You could scavenge one from an old RV, but be careful about mixing beer and homemade propane devices.
Or you could find a cold mountain stream just like you see in the beer commercials! Remember to pick up your empties after picking up the babes.

LoL! I always pick up my empties.

Well most domestic fridges use propane for the refrigerant these days. So I honestly don't see how that's any better than a small bar fridge. Maybe I can cascade some of those USB fridges:

#### tcmtech

##### Banned
Oh, and I just love how people are no longer surprised of craziness here. I mean surely you see a lot of people going camping with a cooler that has built in phase change system.

I dont post 3/4's of the day to day stuff I work and play with! The 1/4 I do let this forum onto gets enough questionable attention as is!
Theres a reason you dont see me jump all over people with interesting and unique ideas.

How small of compressor do you want?
I scrapped several small dehumidifiers last year that had compressors less than 4 inches in diameter and 6 inches long! They only used about 90 watts I think.
Cute but to small for me to find any useful purpose for them. The compressors worked fine too! The cheap aluminum condenser coils rotted out on them and leaked out the freon.

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#### Frosty_47

##### New Member
I dont post 3/4's of the day to day stuff I work and play with! The 1/4 I do let this forum onto gets enough questionable attention as is!
Theres a reason you dont see me jump all over people with interesting and unique ideas.

How small of compressor do you want?
I scrapped several small dehumidifiers last year that had compressors less than 4 inches in diameter and 6 inches long! They only used about 90 watts I think.
Cute but to small for me to find any useful purpose for them. The compressors worked fine too! The cheap aluminum condenser coils rotted out on them and leaked out the freon.

Was it a gradual leak ?

I found an old windows AC unit and decided to salvage the condenser + evaporator. So when I cut the coil, Lord and Behold! Oil and freon were blasted out for 5 minutes! There was a cloud of oil covering 2 houses down the street. I got lucky that neighbors were not home at a time, otherwise they would have made me clean up all that oil mess on their driveway

Oh, 6" by 4" sounds just right. I will look for some old dehumidifiers than...

#### Frosty_47

##### New Member
The fridge I posted the link to burns the propane to make things cold. It uses absolutely NO electricity to cool. Here is a wiki link that explains the concept:
Absorption refrigerator - Wikipedia, the free encyclopedia

WOW! That is Amazing!

Sorry it was not clear to me the first time, but now that I read some of wiki article on it, I am absolutely blown away that such systems exist. This means I can probably modify the damn thing and make it run of heat generated by a typical camping fire.

Thanks for sharing this with me!

#### dknguyen

##### Well-Known Member
Why is the second gas needed (hydrogen or butane)?

#### tcmtech

##### Banned
When you open an AC system you need to let it bleed off slowly from the highest point in the system if possible. The freon gets dissolved in the compressor oil and acts just like a dropped soda can when you open it quickly!

I believe they were slow leaks and being on the lower pressure evaporator side there was not a lot of pressure but there was a bit of oil that pointed out the corroded spots that leaked easily enough.

kv

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#### tcmtech

##### Banned
If you want a real eye opening read go to the EPA's own website and read the full rules and regulations on air conditioning.
I bet you start thinking every big A/C service dealer is a crooked lying cheating rip off/con artist!
I buy freon and do my own A/C work and I do it for others as well with no license or certification and without any concern for legal hassle. I am 100% legal by the rules and regulations in doing it too!
If you read the EPA stuff you will see how and why any one can as well.

The EPA rules and regulations in general are after distorted, misquoted or often made up by many of the A/C business people just to justify outrageous mark ups and extortionist pricing on common goods that are in fact cheap public purchase and install domain items!

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