Reefs.org Forums

[Sea Turtle]

I actually considered pokeing a hole in the ends of a chest freezer and then placing a coil of tubeing in it.
I know that stainless steel, or titanium is the "better" for heat transfer, but honestly, why not an external pump pushing the water through a few hundred feet of rubber tubeing coiled inside a chest freezer?

Sorry was a rough idea I was going to look into when I considered setting up an outside growout system for propagation. when it gets 120 degrees here I was concerned.

This was was what I was thinking as soon as I started reading the thread. The beer coolers do it, why not this? I think that it should work. Maybe you could hook a small pump up to a ranko device and run the tube through the freezer. Only problem is that the water in the tube after the pump shuts off will freeze up solid. Then what??

[dupaboy1992]

You need to make sure the fridge/freezer can handle the demand of the tank, otherwise, you are going to burn out the compressor very quickly.

[Twisted]

Only problem is that the water in the tube after the pump shuts off will freeze up solid. Then what??

perhaps a speed control on the external pump to reduce the water flow to a trickle? Moving water will not freeze, so a combination of setting the base temp on the freezer to create a more reasonble temp. and createing a minum flow through the tube should keep it from freezing.

Or perhaps set up a secondary water source seperate from the system you are trying to keep cool.
The secondary water source could be a 55 gallon trash can of water diverted into the system to keep running water going through the freezer.

Ofcourse as I said, I never truely brainstormed it due to my main idea of the propagtion system never comming to fruitation.

[Twisted]

You need to make sure the fridge/freezer can handle the demand of the tank, otherwise, you are going to burn out the compressor very quickly.

the small chest freezer are built to run almost constant. I kept one on my back porch for extra meat and frozen goods for the last few years. It stayed in that 30 degree range at all times.
So if you are not trying to do anything short of what it was created to do, there shouldn't be any problem.

[Twisted]

Of course I considered punching a hole in the sides for the inlet and outlet.
someone mentioned to me that there are numerous parts running through the insallation of a chest freezer <no idea if it's true>. But just in case perhaps going through the lid?
I looked at mine and the only thing going into the lid is a couple of wires for the light.

[dupaboy1992]

You need to make sure the fridge/freezer can handle the demand of the tank, otherwise, you are going to burn out the compressor very quickly.

the small chest freezer are built to run almost constant. I kept one on my back porch for extra meat and frozen goods for the last few years. It stayed in that 30 degree range at all times.
So if you are not trying to do anything short of what it was created to do, there shouldn't be any problem.

How many watt/HP is the compressor? Your compressor maybe fine to run constant to keep the well-insulated chest freezer in good order, but a fish tank does not have much insulation property, and there are a lot of heat source within the aquarium to will undoing the work of the compressor all the time.

[JohnHenry]

http://www.beananimal.com/articles/dorm ... iller.aspx

[maypo59]

I tried it years ago.. tried just about every variation of loops, tubes, lengths, pump sizes.. after 2 years of fiddling, I finally gave up and just bought a real chiller. Thats been like 8 years ago, and it's been worth every penny. I do have a dorm fridge in the basement now with inlet and outlet holes.. it's doing what it does best.. keeping the Sam Adams happy..

[miwoodar]

http://www.beananimal.com/articles/dorm-fridge-aquarium-chiller.aspx

You took the words right out of my mouth!

As folks above have said - a DIY chiller is a wild goose chase. Sure, if you put enough time and effort into it you could pull if off but you'll end up spending as much as a commercial off the shelf unit to do so. If you are determined to do it, make it a purely academic pursuit. Otherwise it's a total waste of time. Read the beananimal link. This issue is right in Bean's wheelhouse.

Have you considered increasing your evaporation? If you haven't gone that route yet, you might be very surprised at how effective it can be. My last tank, a 65, ran two 250 halides and two 95 VHOs. I was running about 10x the volume of the hood per minute using two small computer fans. I also ran a 6" desk fan in the sump. The tank wouldn't go above 80* with the house thermostat set at 79*. One thing that helped the in-canopy cooling...I had it set up quite different than many you see on the web. The entire thing was totally sealed but for the two computer fans coming in the back and slots on the top for the air to exhaust. This sort of setup will ensure that the fans don't short circuit the air movement. You'll essentially end up with a single pass kind of arrangement. IME, much more effective. Also, choosing pumps judiciously can help. Stream/prop pumps are way more efficient and put less heat into the water than any other common water movement method.

[phillstone]

Do NOT drill holes thru the sides of a chest freezer. The refrigerant lines run in the walls of chest freezers. You will most likely drill thru a refrigerant line , releasing all the refrigerant ( and kill the ozone). Also chest freezers use no fan to move air so heat transfer would take too long to be effective w/ pump running and w/pump off lines could freeze.