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DIY solar water heater - Page 2

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Posted by JIMMIE on August 4, 2009, 6:55 pm

Im building some models similar to the CPVC ones you described.
Instead of CPVC I planning on using Cu and instead of the snap on
radiator I am going to use galvanized sheet metal and solder it to the
pipe. First test attempt may be EMT soldered to the pipe as I have
some on hand.


Posted by JIMMIE on August 6, 2009, 12:34 am

oops make that EMT solered to the galvanized sheetmetal


Posted by Solar Mike (NZ) on August 6, 2009, 2:20 am
 Galvanized sheet metal will work, but due to the lower heat
conductivity ie 1/6th that of copper the fin riser pipe spacing will
have to be in the following ranges
for effective heat transfer into the water carrying riser tubes.
0.5mm thickness = 75mm spacing
1.0 = 90mm
1.5 = 100mm

if you use soft copper foil, very easy to hand press an indentation
for soldering
available in 300mm wide rolls, costs NZ $8 per kilo for 0.25mm, Roll
it across the risers, press a slight indentation, flip the assembly
and solder with 50/50 stick solder, liquid flux and lpg torch, very
quick and easy
0.25mm = 125mm spacing
0.45 = 140mm
0.7 = 160mm

and aluminum, mini corrugate works well here as it already has
indentations, rivet with backing strip.
0.5mm = 124mm spacing
0.75 = 140mm
1.0 = 150mm

Good Luck
Mike (NZ)

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