mcblablabla Posted June 8, 2015 Share Posted June 8, 2015 Hello to all, I am actually planning/ prototyping my DIY LED fixture for my 280 gallons tank based on multiple Nano Box V3 arrays from Dave. Please see the tank pictures where you can see the dimensions and the buildup of the reef. For each Nanobox V3 array, I want to use this heatsink: http://reefll.com/index.php?route=product/product&path=65_69&product_id=70 I think it should suitable for cooling a V3 array. What do you think, I am right? I am considering different setups. First picture displays a minimum approach of 14 V3 arrays, second picture the maximum setup with 20 V3 arrays. Then I played a little bit and created a layout with two circle of V3 arrays. What do think approach 1 or 2 or something between? I think approach 3 (circles) will create only some spot areas. Link to comment
DaveFason Posted June 8, 2015 Share Posted June 8, 2015 Personally I would go with the max array set up. Not being a sales man, just this is a huge tank. I like the multi row over the circle too. -Dave Link to comment
Benny314 Posted June 8, 2015 Share Posted June 8, 2015 Those are some cool looking heat sinks, you hopping to get away with being fanless? Like Dave says, more is better, you can always dim them, it's a pain in the ass if you don't have enough at 100%. Link to comment
Horerczy Posted June 9, 2015 Share Posted June 9, 2015 I love those heatsinks. Very potent. Link to comment
mcblablabla Posted June 9, 2015 Author Share Posted June 9, 2015 I love those heatsinks. Very potent. Those are some cool looking heat sinks, you hopping to get away with being fanless? Like Dave says, more is better, you can always dim them, it's a pain in the ass if you don't have enough at 100%. Yes, my plan is to build the fixture fanless - hope it will work. My ideal is shown on http://reefll.com/index.php?route=information/news&news_id=26 . I ordered a V3 array to see how the heatsink and the V3 array work together. The power of the V3 array is nearly the same like the one from reefll. Link to comment
Paleoreef103 Posted June 10, 2015 Share Posted June 10, 2015 Very interesting design. They do recommend with those Heatsinks to use fans with them on the first link posted, but if you keep the power draw low it should work out. I'm with Dave on the arrangement of the arrays. 35" deep requires a huge punch. Link to comment
dorky08 Posted June 11, 2015 Share Posted June 11, 2015 this is interesting in a good way. how are you planning to connect the heatsink? Link to comment
mcblablabla Posted June 11, 2015 Author Share Posted June 11, 2015 Very interesting design. They do recommend with those Heatsinks to use fans with them on the first link posted, but if you keep the power draw low it should work out. I'm with Dave on the arrangement of the arrays. 35" deep requires a huge punch. Reefll offers to version of the heatsink - one with 25 an one with 40 fins. Now as you point out that I have re-read the items in their shop. 40 pin is for active cooling, 25 pins for passive cooling? I will ask Dimitri if this a typo. Thanks for the advice. this is interesting in a good way. how are you planning to connect the heatsink? I plan to connect the heatboard (don't know the englisch word - I'm not a native speaker) of each heatsink to slim aluminium bar with screws. This bar will be somehow fixed on normal aluminium profiles. That's the plan - hope it works. Link to comment
dorky08 Posted June 11, 2015 Share Posted June 11, 2015 would like to see how that work out keep us posted on ur progress and take plenty of picture too Link to comment
Paleoreef103 Posted June 11, 2015 Share Posted June 11, 2015 Reefll offers to version of the heatsink - one with 25 an one with 40 fins. Now as you point out that I have re-read the items in their shop. 40 pin is for active cooling, 25 pins for passive cooling? I will ask Dimitri if this a typo. It might have to do with the fin density being too much for non-active cooling. It is weird that the less massive heat sink is recommended for passive cooling. At max power a 13-up will eat up about 37.2W which is above the recommended heat dissipation for the heat sink (30W for the 25 fin HS). However, it is recommended that each 13-up is run at 700mA (or ~27W). Link to comment
evilc66 Posted June 12, 2015 Share Posted June 12, 2015 It's all about fin spacing for natural convection cooling. Too tight of a spacing and the hot air actually gets trapped between the fins, making the extra surface area null and void. It only takes a tiny puff of air to break up that stagnation though. Link to comment
Fyrwulf Posted June 21, 2015 Share Posted June 21, 2015 It's all about fin spacing for natural convection cooling. Too tight of a spacing and the hot air actually gets trapped between the fins, making the extra surface area null and void. It only takes a tiny puff of air to break up that stagnation though. Basically this. Those heatsinks were designed for passive PC cooling, which isn't the same thing as fanless. Any custom air cooling setup for a computer is going to use positive pressure, which force the air through the fins as it moves across the computer. EDIT: I see you're from Shelby. I went to middle school and high school in Dearborn. Small world. To the OP: Look into mofset pin-style heatsinks. And if you're looking for passive because of noise, I can point you to fairly high performance fans with relatively low noise that are designed for silent PC cooling. EDIT: It's a shame there aren't any water cooling blocks for these arrays. Too bad there isn't anybody around here with a machine shop... Link to comment
Benny314 Posted June 22, 2015 Share Posted June 22, 2015 I love my pin sinks. 16X16cm 25mm tall with 8mm bases. Cooling 30 3w LEDs, with the fans spinning at about 1200rpm the arrays only reach 33 degrees Celsius when the lights are at peak output (about 59%). Also the arctic F series fans are all but silent. I'm using 120TC Pro's on my arrays (got their own temp sensors and idle at 1200rpm and ramp up to 2400rpm when the temp gets around the 38C mark as they're computer case fans, don't think they've ever had to do more than idle) and I have a F90 in my controller case which is also very quiet for a 2000rpm + fan. Link to comment
dorky08 Posted June 26, 2015 Share Posted June 26, 2015 I love my pin sinks. 16X16cm 25mm tall with 8mm bases. Cooling 30 3w LEDs, with the fans spinning at about 1200rpm the arrays only reach 33 degrees Celsius when the lights are at peak output (about 59%). Also the arctic F series fans are all but silent. I'm using 120TC Pro's on my arrays (got their own temp sensors and idle at 1200rpm and ramp up to 2400rpm when the temp gets around the 38C mark as they're computer case fans, don't think they've ever had to do more than idle) and I have a F90 in my controller case which is also very quiet for a 2000rpm + fan. i love those fans Link to comment
mcblablabla Posted June 26, 2015 Author Share Posted June 26, 2015 I love my pin sinks. 16X16cm 25mm tall with 8mm bases. Cooling 30 3w LEDs, with the fans spinning at about 1200rpm the arrays only reach 33 degrees Celsius when the lights are at peak output (about 59%). Also the arctic F series fans are all but silent. I'm using 120TC Pro's on my arrays (got their own temp sensors and idle at 1200rpm and ramp up to 2400rpm when the temp gets around the 38C mark as they're computer case fans, don't think they've ever had to do more than idle) and I have a F90 in my controller case which is also very quiet for a 2000rpm + fan. Hello Benny, do you have some spec information of your pin fin heatsink. Where did you bought that? Link to comment
Benny314 Posted June 30, 2015 Share Posted June 30, 2015 Hello Benny, do you have some spec information of your pin fin heatsink. Where did you bought that? I'm in the UK, got them on ebay. Looks like the seller has either run out of stock or stopped trading, there aren't any listed at the minute. They were £15 a heat sink with free shipping. I couldn't believe it as heat sink is dead expensive. Link to comment
mcblablabla Posted July 2, 2015 Author Share Posted July 2, 2015 Now I got a second heatsink from China Alibaba. It is nice but I afraid it will be a little bit to small for full power driven V3 array. Originally it is for GPU cards. The specification informations spread from 10 to 80 Watt heat dissipation. It depends on which supplier offer this heatsink on Alibaba. Furthermore there is a small copper plate on it, which seems cumbersome for mounting the V3 array on it. Pherhaps it is removeable. But give it a try. I have to wait for the V3 array as it still not arrived in Germany. It is important for prototyping to have the exact dimensions of the array. Salute Gerd Link to comment
evilc66 Posted July 2, 2015 Share Posted July 2, 2015 That square looks machined/cast into the heat spreader. You will need to sand ( ) or machine it off to get a good mounting surface for the board. Also, with the fins that densely packed, you are going to need to supply a little airflow to make that heatsink work well. Without airflow it may actually make the LEDs too hot, even though there is a ton of surface area. It doesn't need to be a lot of flow. 2-3CFM will do wonders for it. Link to comment
mcblablabla Posted July 3, 2015 Author Share Posted July 3, 2015 Short update - size comparison. Link to comment
DaveFason Posted July 6, 2015 Share Posted July 6, 2015 Short update - size comparison. Just dropped you an email back! -D Link to comment
mcblablabla Posted September 21, 2015 Author Share Posted September 21, 2015 I decided to stop this project. Thanks for your interest! Salute Gerd Link to comment
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