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Radiator in a Fish Tank - Page 3

post #21 of 38
Heat won't disappear. It will heat up water and give you terrible temperatures.
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post #22 of 38
It depends how big the fish tank is. For instance, my 180G tank has 750 watts of halides heating it up for 8 hours a day. With a fan on it keeps the temperature under 84.
post #23 of 38
Quote:
Originally Posted by fat_italian_stallion View Post
Why not get passive radiators instead? They'd work much better and no need for fans.





I looked into getting a setup with one of those. Unfortunately, they're made of aluminum.
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post #24 of 38
It can work if the setup is right, but it will be cheaper to buy a 360 or 480 rad.
Edited by dixson01974 - 5/30/11 at 5:22pm
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post #25 of 38
Thread Starter 
If I drop the rad into the tank, I don't think there will be any heat problems from day to day operation. But when benchmarking, I can fill the whole thing with ice . I think the fish tank idea is kind of bad.

But I think using a plate heat exchanger, 4 small reservoirs, and a decent rad (low-rpm fans) will provide awesome cooling, with minimal noise. 4 reservoirs, provide 3.65 square feet of surface area. The will also be place in an open area, not on a wall of some sort.

edit: I'm looking to get really high benchmark results, while maintaining a good low temperature.
I think this setup will be perfect, since the plate heat exchanger provides nearly instant heat exchange, and the reservoirs will hold 1.6 liters of coolant, which should last more than long enough to go through a benchmark.
Edited by whoa044 - 5/30/11 at 5:47pm
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post #26 of 38
I don't think you're going to see any significant improvement from nesting two cooling systems if the liquids are the same in each. It will functionally be the same thing as having the same volume of water, and same cooling hardware in a single loop.

The idea about the outer "ice bath" is a good one, though, I think that would work because effectively it's a chilled water situation... would take a lot of replenishing the ice though.
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post #27 of 38
Thread Starter 
Quote:
Originally Posted by threephi View Post
I don't think you're going to see any significant improvement from nesting two cooling systems if the liquids are the same in each. It will functionally be the same thing as having the same volume of water, and same cooling hardware in a single loop.
Okay, I'll make this a little more clear:
I already have a water cooling system, but it is just below desirable performance.

I plan on putting a plate heat exchanged somewhere in the loop.

I will explain plate heat exchangers:
They are the same as radiators, but instead of fans cooling them, water flows through it, but the two liquids never make contact inside. Imagine it as an air-cooled radiator submerged under flowing water.

edit: If I can keep the secondary loop cool enough, heat dissipation will be over 2.7kW (I already have a rad in the primary loop)
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post #28 of 38
Well, what happens if you add a bubbler into the fishtank thats cooling the rad?

Worth a shot imo.
post #29 of 38
Quote:
Originally Posted by dklimitless View Post
Fish-tank reservoir means super high pressure for a pump what wasn't designed for it == inefficient pump = fried components
Does not compute.
 
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post #30 of 38
Quote:
Originally Posted by whoa044 View Post
Okay, I'll make this a little more clear:
I already have a water cooling system, but it is just below desirable performance.

I plan on putting a plate heat exchanged somewhere in the loop.

I will explain plate heat exchangers:
They are the same as radiators, but instead of fans cooling them, water flows through it, but the two liquids never make contact inside. Imagine it as an air-cooled radiator submerged under flowing water.

edit: If I can keep the secondary loop cool enough, heat dissipation will be over 2.7kW (I already have a rad in the primary loop)
Yup, I know what a plate heat exchanger is They are indeed a very efficient way to transfer heat between two fluids. If those two fluids are the same substance, and already close to or at thermal equilibrium, it's not going to have much of an impact.

I think we're saying the same thing... as you say, you will need to keep the secondary loop cooler than the primary loop to achieve your goal, thus establishing a significant difference in the liquids in each loop. I do think the ice-in-the-fish-tank idea is an economical and elegant way to get some extra cooling on a temporary basis. Cheaper still would be to just set the reservoirs for the primary loop in the tank with the ice water. But when you're not actively chilling the tank, I think you're going to see very similar performance to just using the tank as a big res in one loop.

Look at it this way... a plate heat exchanger isn't going to be more efficient at transferring heat between two loops of water than water. Assuming all the other factors are the same--total volume of water, size and number of radiators and fans, etc., it seems to me the only way nesting these loops is going to improve performance is if the outer loop is actively chilled. Then, what's helping you actually, is the inefficiency of the plate heat exchanger, since it will probably act as a temperature buffer and prevent the water in the primary loop from getting so cold that you have to worry about condensation.

If you go with the ice-tank setup with the heat exchanger, you'll probably want a filter for the secondary pump's intake since it sounds like that loop would be open.
Edited by threephi - 5/30/11 at 10:36pm
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