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Old 07-01-2010, 03:31 AM   #11
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This kind of stuff interests me, and I think the phrase that keeps coming up is thermal mass. I'm wondering, if the leds get hot enough, during the day the setup will cool the lights/heatsink (the ground is still cold from the night before) but during the night, the ground will begin to add heat to the system, but then again the lights will probably be off during the night? Soil isn't a very good conductor, and it would seem you are trying to delay the effect of the heat until you can turn your lights off?
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Old 07-01-2010, 09:55 AM   #12
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The frost doesn't get below three feet in Canada?!? Here in Chicago we have to bury pipes down five feet to prevent freezing.

By the way, this seems like major overkill for cooling an LED system. One of the biggest reasons to go LED is the lack of heat compared to the other popular lighting systems. Personally, I'd just get a big strip of heat sink and a couple fans.
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Old 07-01-2010, 11:07 AM   #13
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Canada is the biggest country in the world. We have winters that range from -40 F(-40 C) to some places that don't get much below 32 F (0 C) for more then a day or two. LED's produce similar per watt to a MH but most of the heat is at the base of the unit with LED's and MH tend to radiate more heat. LED's also produce similar light to MH (80 Lumens per watt is the LED's I'm going with) I also believe that "...a big strip of heat sink and a couple of fans." would not be adequate... I would need a bunch of fans and that adds noise which I don't need.
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Old 07-01-2010, 11:13 AM   #14
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This kind of stuff interests me, and I think the phrase that keeps coming up is thermal mass. I'm wondering, if the leds get hot enough, during the day the setup will cool the lights/heatsink (the ground is still cold from the night before) but during the night, the ground will begin to add heat to the system, but then again the lights will probably be off during the night? Soil isn't a very good conductor, and it would seem you are trying to delay the effect of the heat until you can turn your lights off?
That's why you need lots of pipe under ground. If you look at geothermal heat pumps for house heating/ AC you will see what it looks like on a large scale. At about 6' down the ground stays the same temp all year long and by the time the water gets back to the pump it has equalized with the ground, and the heat continually dissipates out from the pipe. I'm hopping that I can run the lights 24/7 and not experience higher temps coming back to the pump, because I plan of having my refugium lights on at night. If it is still warm when coming out of the ground then I will add another 100' of pipe under ground.
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Old 07-01-2010, 11:14 AM   #15
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I suggest using a mix of antifreeze and water just in case.
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Old 07-01-2010, 11:27 AM   #16
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I suggest using a mix of antifreeze and water just in case.
Thank you. I'm planning on doing that, but it's more because it doesn't just appear underground. It will be exposed for a foot or two.
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Old 07-01-2010, 05:32 PM   #17
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I would be very careful using water to cool your leds.when water is used and is constantly being heated and cooled within a closed loop you may get legionella in your water system which means chemical dosage aswell as a very dangerous situation for yourself and your family.Is it for the leds or the drivers you need the heat sinks for?
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Old 07-01-2010, 05:40 PM   #18
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I'm pretty sure a good dose of antifreeze would poison living things in there.
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Old 07-01-2010, 05:46 PM   #19
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antifreeze won't touch legionella ask any air conditioning engineer.
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Old 07-01-2010, 07:51 PM   #20
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It will be a closed loop system with copper pipe so I will not have to worry about it... also it's RO/DI water so there is nothing for the bacteria (if it does get into the system and live) to eat thus no multiplying numbers. Also the only way water to get out of the system is if there is a leak. On another note, I got my tank YAHOO!
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