CXA3590 Build Plan
- Thread starter Doer
- Start date
Abiqua
Well-Known Member
terrible back pressure in your fans....try to find with over 2 inches of back pressure...I bet this one hovers around 1, if lucky...
Doer
Well-Known Member
Back pressure? Like the fan suction? Good point. I had not thought of that.
Doer
Well-Known Member
Based on the latest estimates for active at 25 w/cm2, I price this heat sink.
It cost the same, has the .300 base, but is 2 feet longer for spread.
3.500" Wide Extruded Aluminum Heatsink
Choose Length (Inches): 72" = $82.80
It cost the same, has the .300 base, but is 2 feet longer for spread.
3.500" Wide Extruded Aluminum Heatsink
Choose Length (Inches): 72" = $82.80
Doer
Well-Known Member
It can be your excessive but not mine.
The sink is only 3.5 inches wide. I am not trying to light a dimension of canopy. I've done all this in a tiny bathroom, but I will have a bedroom in the new house I just bought.I am trying to make a high watt device, with good spread and good thermal characteristics, as simple as possible to build and maintain. And I want it to better than my 1000w HPS.
You were asking for a drawing?
bicit
Well-Known Member
It can be your excessive but not mine.
I am trying to make a high watt device, with good spread and good thermal characteristics, as simple as possible to build and maintain. And I want it to better than my 1000w HPS.
You were asking for a drawing?
View attachment 3368132
Your build looks anything but simple. Quite the opposite actually, drilling and tapping a 6' sink is going to be a chore. It's going to be big, awkward, and heavy. Then you want 3 of these monstrosities!
You're money, use it how you want it. I just think you could get better results and simplify your build by going with smaller pieces. Though you seem to have gone into 'challenge accepted' mode at this point.
The reason I ask the dimensions of the space you plan to light is that you can easily bleach the plants with too much concentrated light. More than 55 w/ft^2 is pointless can actually cause plants stress or worse bleaching.
Doer
Well-Known Member
This device has a width spread of 56.5 inches at 36 inches, 115 degree cone.
And in 72 inch length it will have an additional 40 inches of spread, 20" on each end. COBs are inset 6 inches from ends.
So, the footprint at 3 feet distance is 56.5 x 112 = 6228 sq inch or 4.08257248 m^2.
900w x 40% = 360 PAR watts / 4.08257248 = 88w / sq meter
Total amount of sunshine (direct and indirect from the atmosphere) hitting the ground is around 1120 W/m2 (per wiki)
But, about 60% is not PAR.
In terms of energy, sunlight at the earth's surface is around 52 to 55 percent infrared (above 700 nm), 43 to 42 percent visible (400 to 700 nm), and 5 to 3 percent ultraviolet (below 400 nm).
So, 1120 x .4 = 448 PAR watts per meter sq. for Sunlight.
And in 72 inch length it will have an additional 40 inches of spread, 20" on each end. COBs are inset 6 inches from ends.
So, the footprint at 3 feet distance is 56.5 x 112 = 6228 sq inch or 4.08257248 m^2.
900w x 40% = 360 PAR watts / 4.08257248 = 88w / sq meter
Total amount of sunshine (direct and indirect from the atmosphere) hitting the ground is around 1120 W/m2 (per wiki)
But, about 60% is not PAR.
In terms of energy, sunlight at the earth's surface is around 52 to 55 percent infrared (above 700 nm), 43 to 42 percent visible (400 to 700 nm), and 5 to 3 percent ultraviolet (below 400 nm).
So, 1120 x .4 = 448 PAR watts per meter sq. for Sunlight.
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Doer
Well-Known Member
So, you say, but sunlight is 440 watts PAR. And it is 1120 total watts/meter sq. at the surface with 60% infrared and ultraviolet.
And to convert to metric there are 10.764 sq ft in a sq meter. 1120 / 10.764 = 104 watts of raw sun per /ft^2.
So, it is meaningless to say, 55 is some limit. Only 1/2 sun power.
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Doer
Well-Known Member
Drill and tapping the number of holes for the COBs has nothing to do with the length of the sink.
Besides I will make a clamped drilling template for the holes. That's how we do it uptown.
Doer
Well-Known Member
Shipping is $25.60 FedX
Shipping for 9 x
RCX-Z200
Rosewill fans from Amazon is free.
9 x = $124.11 + Free Shipping
The heat sink is 82.50 + 26.50 = $109
I can easily make the duct from 1/2 foam board double sided with mylar. Score parallel lines 6 inch apart the length of one side and leave the inside layer intact. Snap it into a square tube. Tape the edges. I can get 2 tubes per panel. So, $20 bucks a tube. And maybe 3 pounds each.
The sink weighs, 0.15 x 72 = 10 pounds.
So, I am not sure if you are really seeing this yet @bicit
The Rosewills weigh 1# each, and the wiring is a mess. I will have something that weighs under 20 pounds completely self contained.
This is all due to the efficiency gains in active horizontal, force air cooling.
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Doer
Well-Known Member
Man? Did I say above the canopy? No. I calculated fux density at 36" and you went all assumptive.
Greengenes707
Well-Known Member
If you don't mind me asking, what is the point of calculating it at a distance if you are not going to be using it at such a distance?
Positivity
Well-Known Member
thats what it will be marketed as...
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