rage557

You can improve the efficiency of the heat exchange by misting the radiator. The evaporating water uses up alot of energy that it takes in the form of heat there by improving cooling dramtically. Most commercial HVAC units have water sprayed onto the coils for that very reason. I would say stick with the fan, and get a mister from your local garden store.

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dk8100

I have the water coming out of the bong chiller tube splashing onto the radiator, but most of the radiator is submerged. I went to micro center this morning and bought an 80mm enlobal because that was all they had. The fan spins extreemly slow in the water but it seems to move water well. I have it laying on the radiator right now and it seems to be helping the movement of water in the tub. if nothing else it will help the antifreeze water mix stay mixed. The fan is still running for an hour plus. I'm gonna do some testing when the water temp levels off tonight. The chiller seems to be a lot more effective right now because I picked up one of those huge 120x38 fans that claims 130 cfm, i don't believe that but it does really move a lot of air.

I guess I could get the mister working under water. I may try somethign like that later on.

rage557

A mister under water wouldn't do anything because it is underwater. I think you willfind that if you use air cooling and the mister you will get better results. You are trying to force an coolant to air system to be a coolant to coolant.

If that is your goal you should get a coolant to coolant heat exchanger

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rage557

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dk8100

One of those would probably work better but the setup I have right now is working great. With it about -5C outside the water gets down to around 8C after only a half hour of being on. I am planning on leaving it on overnight and try for subzero tub temps in the morning. I think i might try to make a liquid to lliquid heat exchanger by encasing a normal radiator. Thanks for the pic.

dk8100

The 80mm fan that I had in the antifreeze tap water mix ran from last Thursday until today and then this morning when I checked it it was not spinning. The fan looked to be under considerable resistance under the water, yet was still able to circulate water quite effectively. I took the fan out of the water and it would still not work. I waited all day and let it dry and it would still not work. At that point I thought the fan was dead. I pulled off the removable blades and figured why not clean it. I used qtips and rubbing alcohol and cleaned out every surface I could get to on both the fans and the motor. I am happy to report that after a few cleanings the fan is now working great, in fact it seems to run like new. I am going to let it run out of the water for a few hours and then stick it back in the tub. Being able to take apart these fans easily saved this $10 fan(you can get them for around $7 a piece from directron). Cleaning these fans is a breeze and they don't cost much mroe than normal fans. I am guessing that I will have to clean it 2 times a week which frankly is fine with me. I am impressed they lasted in the mix they're in. I ordered 3x120 and 2x80 of these fans from directron yesterday and I am confident that they are the best investment in fans i have made. Now only if they made a 120x38 mm one that could move 100+ cfm.

Ill post an update after I get the fan back into the water.