Nice, propper mounting aswell. Bolt thru with backplate. Nice contender for SPCR test maybe
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I don't think so. Last time I read up on the NPIH heat columns, they only had a very slight vacuum. Heat pipes have a pretty high vacuum.Redzo wrote:Direct contact BIG heatpipe
Why would the external pressure make any difference, or am I being a twit?Felger Carbon wrote:I think that means you have to live at sea level, and if in Manhattan not above the 8th floor, to use a heat column.
First, twitness: I too think there's a twit in the woodpile, but it's not (IMHO) you, nick, or me. Here's the deal: the folks at NPIH are apparently the only ones to make the sealed-end (for CPU mounting) copper tubes that are the "heat column" (not heat-pipe, which requires a high vacuum and a little moisture to work).nick705 wrote:Why would the external pressure make any difference, or am I being a twit?Felger Carbon wrote:I think that means you have to live at sea level, and if in Manhattan not above the 8th floor, to use a heat column.
But only relative to the outside? At altitude, the absolute pressure inside will in fact be a bit *lower*, as the membrane bulges out increasing the internal volume. I'm still not getting it...Felger Carbon wrote: There is one small problem: the sealed column, once you go uphill just a short distance, no longer contains a slight vacuum, it contains a slight positive pressure!And, if you continue uphill to Klamath Falls and 4100', you get a helluva overpressure! Uh, what about the secret sauce that needs a slight vacuum to work? Well, the genius who figgered out this near-scam overlooked that little problem.
Hmm...that actually makes a lot of sense. Look at that second link: Some HSFs. In the middle of the page are three coolers which seem to lack the "cap". Instead, there's an ugly copper "nipple", which looks like the end of a traditional small diameter heat pipe. Maybe they vacuum seal off the end in the same fashion as a small diameter heat pipe?jaganath wrote:is it not possible that the actual seal for the pipe is below the membrane, which is purely there for cosmetic purposes? and possibly some air is trapped under there at atmospheric pressure, hence the bulging?