water in a pipe

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Subject Author Date water in a pipe no spam 03-22-2007  Re: water in a pipe Neon John 03-22-2007  Re: water in a pipe no spam 03-23-2007  Re: water in a pipe GeekBoy 03-22-2007  Re: water in a pipe harry k 03-22-2007  Re: water in a pipe no spam 03-23-2007  Re: water in a pipe GeekBoy 03-23-2007  Re: water in a pipe nicksanspam 03-22-2007  Re: water in a pipe no spam 03-23-2007  Re: water in a pipe nicksanspam 03-23-2007  Re: water in a pipe dbljay7542 03-25-2007  Re: water in a pipe nicksanspam 03-26-2007  Re: water in a pipe Joe Fischer 03-23-2007  Re: water in a pipe Ulysses 03-22-2007  Re: water in a pipe no spam 03-23-2007
Posted by no spam on March 22, 2007, 3:50 pm Please log in for more thread options I have been thinking about making a poor man's solar water pre-heater by using a 100 foot coil of black plastic pipe (3/4" or 1"). But my numbers don't seem to add up so I need a little help. Using the old pi*r^2*h I come up with 3/4" pipe holding about 2.5 gal and the 1" stuff 4 gal. Doesn't seem worth the effort, much less the money, for no more hot water than that. Also will "polyethylene coil pipe" rated at 100 psi hold up under the heat and UV? At $21US per 100 feet I'd think I'd save that much in water heating if it only lasted one year. Posted by Neon John on March 22, 2007, 4:14 pm Please log in for more thread options >I have been thinking about making a poor man's solar water pre-heater by >using a 100 foot coil of black plastic pipe (3/4" or 1"). > >But my numbers don't seem to add up so I need a little help. Using the old >pi*r^2*h I come up with 3/4" pipe holding about 2.5 gal and the 1" stuff 4 >gal. > >Doesn't seem worth the effort, much less the money, for no more hot water >than that. > >Also will "polyethylene coil pipe" rated at 100 psi hold up under the heat >and UV? At $21US per 100 feet I'd think I'd save that much in water heating >if it only lasted one year. > Yes It'll hold up. I can think of one instance where a neighbor's water supply from a high spring involves that pipe laying on the ground. It's been there since the 70s. The cabin that used to be in our family has the same arrangement and the pipe was installed sometime in the mid 60s. Still working fine. As the formula indicates, volume goes up as the square of the radius so using the largest pipe you can find is the key. Even better is a second water tank with the plumbing arranged so that the system will thermo-siphon. I did that one with one of my past houses and it worked great. John --- John De Armond See my website for my current email address http://www.neon-john.com Cleveland, Occupied TN All great things are simple and many can be expressed in single words: Freedom, Justice, Honor, Duty, Mercy, Hope. -Churchill Posted by no spam on March 23, 2007, 12:41 pm Please log in for more thread options >>I have been thinking about making a poor man's solar water pre-heater by >>using a 100 foot coil of black plastic pipe (3/4" or 1"). >> >>But my numbers don't seem to add up so I need a little help. Using the >>old >>pi*r^2*h I come up with 3/4" pipe holding about 2.5 gal and the 1" stuff 4 >>gal. >> >>Doesn't seem worth the effort, much less the money, for no more hot water >>than that. >> >>Also will "polyethylene coil pipe" rated at 100 psi hold up under the heat >>and UV? At $21US per 100 feet I'd think I'd save that much in water >>heating >>if it only lasted one year. >> > > Yes It'll hold up. I can think of one instance where a neighbor's > water supply from a high spring involves that pipe laying on the > ground. It's been there since the 70s. The cabin that used to be in > our family has the same arrangement and the pipe was installed > sometime in the mid 60s. Still working fine. > > As the formula indicates, volume goes up as the square of the radius > so using the largest pipe you can find is the key. Even better is a > second water tank with the plumbing arranged so that the system will > thermo-siphon. I did that one with one of my past houses and it > worked great. I have two plans running around in my mind. The first is the take 100-200 feet of 1" pipe and run it back and forth over the roof of the trailer. The second is to try to use my water heater tank as storage for a thormosiphon system. The bottom of the tank is about 4' above ground level so by placing the coil on the ground in a covered box I might be able to get a siphon. Posted by GeekBoy on March 22, 2007, 4:21 pm Please log in for more thread options >I have been thinking about making a poor man's solar water pre-heater by >using a 100 foot coil of black plastic pipe (3/4" or 1"). > > But my numbers don't seem to add up so I need a little help. Using the > old pi*r^2*h I come up with 3/4" pipe holding about 2.5 gal and the 1" > stuff 4 gal. > > Doesn't seem worth the effort, much less the money, for no more hot water > than that. > > Also will "polyethylene coil pipe" rated at 100 psi hold up under the heat > and UV? At $21US per 100 feet I'd think I'd save that much in water > heating if it only lasted one year. Then use the coil pipe on the roof then switch to PVC hot water piping once you get back into the house. > > Posted by harry k on March 22, 2007, 10:37 pm Please log in for more thread options > > > >I have been thinking about making a poor man's solar water pre-heater by > >using a 100 foot coil of black plastic pipe (3/4" or 1"). > > > But my numbers don't seem to add up so I need a little help. Using the > > old pi*r^2*h I come up with 3/4" pipe holding about 2.5 gal and the 1" > > stuff 4 gal. > > > Doesn't seem worth the effort, much less the money, for no more hot water > > than that. > > > Also will "polyethylene coil pipe" rated at 100 psi hold up under the heat > > and UV? At $21US per 100 feet I'd think I'd save that much in water > > heating if it only lasted one year. > > Then use the coil pipe on the roof then switch to PVC hot water piping once > you get back into the house. > > > > - Hide quoted text - > > - Show quoted text - Minor correction. Switch to CPVC. You don't use PVC in a hot water system. Harry K Similar Threads Posted rain water harvesting / grey water recycling February 9, 2008, 4:42 pm Pre-Heating water for Gas Water Heater September 25, 2008, 3:41 pm Hot water woe December 25, 2008, 6:07 pm Re: Hot water woe December 31, 2008, 8:32 am Re: Hot water woe December 31, 2008, 8:43 am Re: Hot water woe December 31, 2008, 5:17 pm Re: Hot water woe January 2, 2009, 6:15 pm Re: Hot water woe January 4, 2009, 10:21 am Power from water? February 16, 2007, 12:41 am Water Wheel July 16, 2008, 8:43 am