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- #121
Re: Quest for 1g/w: 1k hps liquid cooled on a 6' mover in a 4x8 tent.
man, i like the way you think bro. but i'm not sure about some of it.
A 1000w hps makes a hell of a lot of heat. surprisingly so to me. but after thinking about it now it actually fits.
The luminous source efficacy (efficiency) of a 140,000 lumen, 1000w HPS is about 20%. that means 200 watts makes light in the visible spectrum, and 800 watts is making heat. now think about strapping a 800 watt heater to your cold water pipe.
now, I have about 55 gallons of water cooling my HPS, and the water is about 90*F or so. hot. now if you were to but up against a cold water line, you'd have 90* cold water for the first minute or two you use cold water whenevr the light is on. you'd be surprised how quickly a 1k HPS will raise 50 gal of water. I would guess about 5-7 degrees per hour until it hits equilibrium with the environment.
also if your cold water pipes are like mine, they are only 1 inch copper. so if you could find 40 feet of it under your house, thats only storing 40x12x.25x3.14=375 cu. in. = about a gallon and a half. not much volume after all to soak up that heat.
you're right that copper conducts quickly, but its also more expensive and harder to work with than pvc. . . but your right that it would probably work a lot better.
burying a 50 gal res might be easier than diggin a trench, but honestly its not that hard if its just dirt. . . you don't have to wheel it anywhere because you are just gonna back fill it again. so i figure its probably a full days work for one trench. worth it IMO, but i'm never afraid of putting in some elbow grease.
I think encasing copper tubing in concrete slabs on the surface of the ground around the outside of the house would be amazingly efficient 8 months out of the year around my parts and have the added benefit like tor was saying of putting that waste to a use, thus making it no longer waste.
my friend doesn't have a meter on his water, it's just monthly flat rate. . . he could run to waste, and that would be by far the easiest and cheapest way for him to run water cooled. that's another option too.
personally I want to do the trench thing because it would be fun to do for me. I like that kind of stuff and the feeling of accomplishment after I do it myself.
Why go so crazy with all the diggin, use pipes someone already was nice enough to run through the dirt for you...just run the pipes through the floor and run them parallel to your cold water intake in the house and pipetape them...might warm up the first moments of your cold water a bit, but if you run your water regular like (toilets, etc.), you will have a significant mass to dump heat into....copper conducts heat rapidly...(I am such a nerd, will admit to having considered all this and tons more stuff, bong coolers, peltiers, and more for overclocking...there I admitted it...I am free...)
If you want some ground cooling, hammer a copper rod 4-5 ft into the ground and tie it onto your copper piping. Copper conducts fast.
Also on your external pump...you can mount it on a board and then leave one of the mounting holes empty and drill through the board, lay it on the ground and pound a rebar stake or two near it and pipe tape the rebar to the heat fins on the pump...keep your pump alive long by running it cooler.
Put a reservoir down there and run a external short run pump to dump the heat from the reservoir up to the plumbing and then back to the reservoir. Make sure the pipes make really good contact with the cold water pipe.
On the off hours, the short run pump will cool the reservoir to your water temp in your house...lots of heat storage in that to start with.
brother, from ramblin High....
man, i like the way you think bro. but i'm not sure about some of it.
A 1000w hps makes a hell of a lot of heat. surprisingly so to me. but after thinking about it now it actually fits.
The luminous source efficacy (efficiency) of a 140,000 lumen, 1000w HPS is about 20%. that means 200 watts makes light in the visible spectrum, and 800 watts is making heat. now think about strapping a 800 watt heater to your cold water pipe.
now, I have about 55 gallons of water cooling my HPS, and the water is about 90*F or so. hot. now if you were to but up against a cold water line, you'd have 90* cold water for the first minute or two you use cold water whenevr the light is on. you'd be surprised how quickly a 1k HPS will raise 50 gal of water. I would guess about 5-7 degrees per hour until it hits equilibrium with the environment.
also if your cold water pipes are like mine, they are only 1 inch copper. so if you could find 40 feet of it under your house, thats only storing 40x12x.25x3.14=375 cu. in. = about a gallon and a half. not much volume after all to soak up that heat.
you're right that copper conducts quickly, but its also more expensive and harder to work with than pvc. . . but your right that it would probably work a lot better.
burying a 50 gal res might be easier than diggin a trench, but honestly its not that hard if its just dirt. . . you don't have to wheel it anywhere because you are just gonna back fill it again. so i figure its probably a full days work for one trench. worth it IMO, but i'm never afraid of putting in some elbow grease.
I think encasing copper tubing in concrete slabs on the surface of the ground around the outside of the house would be amazingly efficient 8 months out of the year around my parts and have the added benefit like tor was saying of putting that waste to a use, thus making it no longer waste.
my friend doesn't have a meter on his water, it's just monthly flat rate. . . he could run to waste, and that would be by far the easiest and cheapest way for him to run water cooled. that's another option too.
personally I want to do the trench thing because it would be fun to do for me. I like that kind of stuff and the feeling of accomplishment after I do it myself.
I did it again...I start trying to give a small post and end up with this, I can remove it if you want...
second reservoir
