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metarinka · 01-23-2006, 04:28 PM

hello, I'm in the process of designing a passive radiator. It would end up being about 88 feet of 3/4" thin schedule (M) copper pipe. I'm not sure if I really have a question just wanted to bounce it off you guys. My rather flaky math puts that at 2 gallons in the loop and I would probably have a half gallon res. I'm assuming just that much water in just about any decent container would be able to radiate enough heat for 1-2 computers.
The res itself would be more or less large concentric circles, with no tight bends, All joints brazed or tapered threads. The only issue I could think of is 3/4" pipe having to much constriction at 88 feet. My design will also allow me to double up and have 2 equal lengths of 45 ft pipe if flow is unacceptable. I'll be be using a large pond pump. off the top of my head in the 1300 GPH range.

any major things I'm over looking? will my pump asplode? I'll post some cad sketches as soon as I get my main comp back online. I'm a welding and fabrication major so the construction bit doesn't bother me and I have access to a full machine shop. Its the design and engineering aspect I must spend my time on.

01-23-2006, 04:28 PM	#1
metarinka Cooling Neophyte Join Date: Jan 2006 Location: Ann Arbor, MI Posts: 34	passive radiator design help needed hello, I'm in the process of designing a passive radiator. It would end up being about 88 feet of 3/4" thin schedule (M) copper pipe. I'm not sure if I really have a question just wanted to bounce it off you guys. My rather flaky math puts that at 2 gallons in the loop and I would probably have a half gallon res. I'm assuming just that much water in just about any decent container would be able to radiate enough heat for 1-2 computers. The res itself would be more or less large concentric circles, with no tight bends, All joints brazed or tapered threads. The only issue I could think of is 3/4" pipe having to much constriction at 88 feet. My design will also allow me to double up and have 2 equal lengths of 45 ft pipe if flow is unacceptable. I'll be be using a large pond pump. off the top of my head in the 1300 GPH range. any major things I'm over looking? will my pump asplode? I'll post some cad sketches as soon as I get my main comp back online. I'm a welding and fabrication major so the construction bit doesn't bother me and I have access to a full machine shop. Its the design and engineering aspect I must spend my time on.