Water cooled cobs

mahiluana

mahiluana

Well-Known Member
Chip Green said:
There is somebody around here, name has escaped me now.....Runs a water cooled cob system that maintains the hot water service in his home....

Ive considered a water cooled VEG light, to warm the clone trays. Since I'm on a small scale it didn't really seem worth it....
Click to expand...
any led lamp > 300W is worth to be watercooled - and can heat up a water boiler .
 
1

1212ham

Well-Known Member
shimbob said:
You're right it's definitely a niche thing. My desire to build it came after we used a Cirrus 1K led light in a 4x4 tent, with poor air flow and without AC, during the summer. Dreadful heat issues.
Click to expand...
I have water cooled strips and everyone tells me it's not needed with strips. I know that and I don't care! I didn't do it for efficiency, I water cooled so I can put the heat where I want it and simply because I could! I thought, I'm going to build a frame, so why not put water through it?

It works like a charm and there is enough surface area on the 1/2" square tube to cool passively. I can run with or without the water and if the pump or something fails it's not an issue. I think the double row Samsung strips would go quite well with water cooling. :wink:
 
shimbob

shimbob

Well-Known Member
I've been thinking about using extruded Al multi-port, which would be wide enough to hold several strips, hollow for water flow, and internally reinforced with the webbings for structural strength over long lengths. Either that or a large, flat, evaporator.
 
nfhiggs

nfhiggs

Well-Known Member
1212ham said:
Not dimensionally. Two strips would require two tubes or one wider, heavier and more expensive tube. The double row strips would be OK on 3/4" or 1" tube.
Click to expand...
No, not really. The single row strips are 18mm wide and the double row strips are 38mm wide. so dimensionally, 2 singles is the same as one double.
 
Randomblame

Randomblame

Well-Known Member
A DR strips is 3,8mm wider as two SR strips next to each other(39,8 vs. 2x 18mm) so it fits on the same tube.

Screenshot_20180510-072630.png Screenshot_20180510-072640.png
 
Last edited:
1

1212ham

Well-Known Member
nfhiggs said:
No, not really. The single row strips are 18mm wide and the double row strips are 38mm wide. so dimensionally, 2 singles is the same as one double.
Click to expand...
I was thinking of the spacing between the rows of diodes, only 10mm on the double row. I use a tube narrower than the strip, the heat is in the middle.
 
Randomblame

Randomblame

Well-Known Member
The heat of the diodes goes first into the PCB and from there over the aluminum of the tubes into the water. There is no direct thermal pass as you know it from discrete Cree or Osram diodes.
 
mahiluana

mahiluana

Well-Known Member
Randomblame said:
There is no direct thermal pass as you know it
Click to expand...
:peace: no - sorry sir :eyesmoke: --- of course there is a direct path --- as you know from a picture, posted last year.

without drilling a "door" for the heat - Tj of any chip is much higher, due to the higher thermal resistance of the thermal grease or glue and the thickness of your metal tube.

S6002082.JPG
 
Randomblame

Randomblame

Well-Known Member
mahiluana said:
:peace: no - sorry sir :eyesmoke: --- of course there is a direct path --- as you know from a picture, posted last year.

without drilling a "door" for the heat - Tj of any chip is much higher, due to the higher thermal resistance of the thermal grease or glue and the thickness of your metal tube.

View attachment 4133751
Click to expand...
Well, I'm not saying it's not possible. If he plans to drill holes below the strips, then in that case closed, wider strips would of course be beneficial.

But I have not read anywhere that he has planned something similar...
 
mahiluana

mahiluana

Well-Known Member
dabby duck said:
cool as hell
Click to expand...
:peace: Ok. - with watercooled led light
and light-heat-cogeneration
it`s possible to recover ~60% of the inverted electr. watts
as hot water - to use it in a builings`energy management or whereever.

So in combination with heatexchanger, pv-panels or wind energy it`s not only a very good buisness to substitute oil or gas heaters - it`s also a perfect way to cool down the whole planet.

Assimilating CO² with photosynthesis in a (little ) greenhouse is the reverse process
of burning fosiles.:fire: ( and a discreet way to fuck Donald in his clean coal ass)

Plants themselves are excellent cooling towers to cool down the atmosphere.
Looking to deforestation, temperature and the deserts of the planet, it's time to plant an apple tree every day.

or whatever :weed:
 
1

1212ham

Well-Known Member
mahiluana said:
:peace: Ok. - with watercooled led light
and light-heat-cogeneration
it`s possible to recover ~60% of the inverted electr. watts
as hot water
Click to expand...
How are you transferring heat from the cooling water to your domestic hot water? Are you pre-heating water in a tank before the regular water heater?
 
mahiluana

mahiluana

Well-Known Member
shimbob said:
a heat exchanger
Click to expand...
in the moment i use an electric boiler with integrated heat exchanger (80L, € 165,-)
I never use the plug to heat up the water - with ~ 300W watercooled led light during
~15h (4,5 KWh) i can prepare my daily need of ~80L / 2 pers. With a closed loup and
3W aquarium pump (200L/h, 0,3bar)
so i leave ~3KWh in the boiler and only ~1,5KWh in my grow room. (as light + rest of the heat)

 
You must log in or register to reply here.
Top