GFX vs home brew

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OK. I give up. You don't even understand "flat spiral."
Nick
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snipped-for-privacy@ece.villanova.edu wrote:

Flat spiral == 7 feet diameter, 2 feet high. NO ROOM FOR THAT EXCEPT IN CEILING!!!
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... 4" high, fool.
Nick
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snipped-for-privacy@ece.villanova.edu wrote:

Ok, 4 INCHES high actually 4.5 inches high as that is the diameter of your outer tubing.
Still 7 feet in diameter, it could only hang vertically on the garage wall, over thee plastic, steel, aluminum, paper recycling rack and the sewage ejector pump would sit under the rack. The sewage ejector pump would cost around $350. Punching a hole in the slab would cost another $350. Installing the sewage ejector in the hole, running power to it, hooking it up to the sewer, installing a vent pipe to the collection tank, piping in the potable water and back tothe hot water tank will cost another $500+ as I will NOT do this myself.
This is getting to be EXPENSIVE for a project that will save me maybe $10-$20/mo on my Natural Gas Plus Solar Hot water system.
Now in new house, not likely to install Solar, but could. DHW is likely to be a 190K BTU tankless model, and I could easily install either Nick's or GFX. MY choice, given that budget will NOT be a concern, will be GFX. May even plumb the GFX thru the geothermal heat pump as it will be in the same room, and preheat the input to he GFX - maybe overkill to do that, but anything will be possible.
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wrote:

Well, if by 'spiral' you mean some sort of serpentine.
Since the pipe is nominally 4", to get a spiral (even a 'flat spiral'), you need at least 8" where one turn crosses over the other ;-)
7' diameter coils for 100' total length means about 18 turns. Coiled in a vertical stack and then 'shoved' off to the side to spread the coils out nearly flat would take a floor space 7' wide and about 72' long (18 turns spaced about 4' apart). That's a tad much floor space for most folks ;-)
daestrom
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wrote:

No, that can't be right :-(
7' diameter coils for 100' total length is only about 4.5 turns. Spread out in a flat spiral, that would be 7' wide and about 16' feet long. Still a fair piece of real-estate.
daestrom
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A mere disk, only 1 layer tall.

... with no crossings.

I think we have some posting delay, and you musta missed this posting:
Article 111798 of alt.energy.homepower: From: snipped-for-privacy@ece.villanova.edu Newsgroups: alt.home.repair,alt.solar.thermal,alt.energy.homepower, misc.consumers.frugal-living Subject: Re: GFX vs home brew Date: 15 Apr 2006 15:46:00 -0400 Organization: Villanova University

The 4" tall spiral hung under a basement ceiling would be about 7' in diameter. The 6' tall coil would occupy a 2.7' floor circle. It seems simpler to install and might have better stratification.
10 PI=4*ATN(1) 20 D=4.25'pipe OD (inches) 30 L0'pipe length (feet) 40 DI=2'coil ID (feet) 50 DO=DI+2*D/12'coil OD (feet) 60 CI=PI*DI'inner circumference (feet) 70 NT=L/CI'number of turns 80 H=NT*D/12'coil height (feet) 90 PRINT D,DI,DO,NT,H
4.25 2 2.708333 15.91549 5.636738
10 PI=4*ATN(1) 20 D=4.25'pipe OD (inches) 30 L0'pipe length (feet) 40 A=D*L/12'pipe area (ft^2) 50 DI=2'flat spiral ID (feet) 60 DO=2*SQR(A/PI+(DI/2)^2)'spiral OD (feet) 70 NT*(DO-DI)/2/D'number of turns 80 PRINT D,DI,DO,NT
4.25 2 7.006704 7.068288
Nick
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wrote:

Yah, I think so.
I was thinking of a helical arrangement, you're talking about a spiral like a phonograph groove.
Yes, it could be that small.
daestrom
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What do you do when you get to the center of the phonograph? Isn't there still at least one crossover needed?
--
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Clarence A Dold - Hidden Valley (Lake County) CA USA 38.8,-122.5
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phhhht......phhhht......phhhht......phhhht......phhhht......phhhht......
Hit the reject button to get the needle back.


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Greywater might enter and leave via the upper vertical arm of a 4" PVC T at each end of the corrugated drainpipe spiral. Fresh water might enter and leave via the ends of the Ts.
Nick
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In alt.solar.thermal snipped-for-privacy@ece.villanova.edu wrote:

Ah, you're not counting those Ts as part of the height of the unit, because it disappears magically into the rest of the plumbing. But the unit and it's accompanying plumbing cannot exist in a 4" high space.
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Clarence A Dold - Hidden Valley (Lake County) CA USA 38.8,-122.5
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The 4" tall spiral hung under a basement ceiling would be about 7' in diameter. The 6' tall coil would occupy a 2.7' floor circle. It seems simpler to install and might have better stratification.
10 PI=4*ATN(1) 20 D=4.25'pipe OD (inches) 30 L0'pipe length (feet) 40 DI=2'coil ID (feet) 50 DO=DI+2*D/12'coil OD (feet) 60 CI=PI*DI'inner circumference (feet) 70 NT=L/CI'number of turns 80 H=NT*D/12'coil height (feet) 90 PRINT D,DI,DO,NT,H
4.25 2 2.708333 15.91549 5.636738
10 PI=4*ATN(1) 20 D=4.25'pipe OD (inches) 30 L0'pipe length (feet) 40 A=D*L/12'pipe area (ft^2) 50 DI=2'flat spiral ID (feet) 60 DO=2*SQR(A/PI+(DI/2)^2)'spiral OD (feet) 70 NT*(DO-DI)/2/D'number of turns 80 PRINT D,DI,DO,NT
4.25 2 7.006704 7.068288
Nick
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