Posted by SJC on October 16, 2006, 3:00 pm
> Mike wrote:
>> Aluminum can be difficuilt to bend unless you have the right tools, the
>> thinner stuff will be easier to work with if youre using some sort of DIY
>> home made press.
>
> I was thinking about keeping the thin stuff and buying something a
> little thicker for a flat plat on front. The thinner stuff will get cut
> and formed to make the back straps (it forms easily). Wonder if there is
> any electolysis between two different aluminum alloys?
>
> Man, there is always something!
>
> Jeff
>>
>> Mike
If you look at the makeup of the alloys here, there is not much difference.
http://www.alufoil.com/products.htm
You might have some of that between copper and aluminum, but the
Sunray Solar people use copper tubes and aluminum fins.
http://www.sunraysolar.com/fintubes.php
>>
>>
>>
>>
>>> Hi Mike,
>>>
>>> I haven't cut the copper yet, but I was going for 4 tube in my ~ 2'
>>>wide box. That would have been ~ 140mm, but that is before I bought a
>>>micrometer and found my aluminum was not 24 gauge (with the back brace
>>>aluminum and solar paint I should be able to step that down form 22
>>>gauge)! Thanks for keeping up with me!
>>>
>>> Cheers,
>>>Jeff
>>>
>>>
>>>>Hi Jeff
>>>>
>>>>Use 2 pieces riveted together with your copper riser tubes in the
>>
>> middle,
>>
>>>>this will effectively double the thickness allowing
>>>>better heat transfer to the copper tubes. Uses double the amount of
>>>>materials, but at least can use what you have. Make the riser spacing
>>
>> 125mm
>>
>>>>Mike
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>> I measured the aluminum flashing I bought for the absorber fins and it
>>>>>comes in at .01". Thinner than I need.
>>>>>
>>>>> I remember someone here had a source for aluminum (that required a
>>>>>request). Does anyone know a good place to buy aluminum? I'm stuck until
>>>>>I can get by that...
>>>>>
>>>>> Jeff
>>>>
>>>>
>>>>
>>
>>
Posted by Jeff on October 16, 2006, 3:10 pm
SJC wrote:
>
>
>> Mike wrote:
>>
>>> Aluminum can be difficuilt to bend unless you have the right tools, the
>>> thinner stuff will be easier to work with if youre using some sort of
>>> DIY
>>> home made press.
>>
>>
>> I was thinking about keeping the thin stuff and buying something a
>> little thicker for a flat plat on front. The thinner stuff will get
>> cut and formed to make the back straps (it forms easily). Wonder if
>> there is any electolysis between two different aluminum alloys?
>>
>> Man, there is always something!
>>
>> Jeff
>>
>>>
>>> Mike
>
>
> If you look at the makeup of the alloys here, there is not much
> difference.
> http://www.alufoil.com/products.htm
Thanks,
The guys over at Solkote said not to worry about elctrolysis between the
copper tubes and aluminum fins (I told him I was priming the copper and
he said not to bother).
Opinions?
Jeff
> You might have some of that between copper and aluminum, but the Sunray
> Solar people use copper tubes and aluminum fins.
> http://www.sunraysolar.com/fintubes.php
>
>>>
>>>
>>>
>>>
>>>> Hi Mike,
>>>>
>>>> I haven't cut the copper yet, but I was going for 4 tube in my ~ 2'
>>>> wide box. That would have been ~ 140mm, but that is before I bought a
>>>> micrometer and found my aluminum was not 24 gauge (with the back brace
>>>> aluminum and solar paint I should be able to step that down form 22
>>>> gauge)! Thanks for keeping up with me!
>>>>
>>>> Cheers,
>>>> Jeff
>>>>
>>>>
>>>>> Hi Jeff
>>>>>
>>>>> Use 2 pieces riveted together with your copper riser tubes in the
>>>
>>>
>>> middle,
>>>
>>>>> this will effectively double the thickness allowing
>>>>> better heat transfer to the copper tubes. Uses double the amount of
>>>>> materials, but at least can use what you have. Make the riser spacing
>>>
>>>
>>> 125mm
>>>
>>>>> Mike
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>> I measured the aluminum flashing I bought for the absorber fins
>>>>>> and it
>>>>>> comes in at .01". Thinner than I need.
>>>>>>
>>>>>> I remember someone here had a source for aluminum (that required a
>>>>>> request). Does anyone know a good place to buy aluminum? I'm stuck
>>>>>> until
>>>>>> I can get by that...
>>>>>>
>>>>>> Jeff
>>>>>
>>>>>
>>>>>
>>>>>
>>>
>>>
Posted by SJC on October 16, 2006, 3:37 pm
> SJC wrote:
>
>>
>>
>>> Mike wrote:
>>>
>>>> Aluminum can be difficuilt to bend unless you have the right tools, the
>>>> thinner stuff will be easier to work with if youre using some sort of
>>>> DIY
>>>> home made press.
>>>
>>>
>>> I was thinking about keeping the thin stuff and buying something a
>>> little thicker for a flat plat on front. The thinner stuff will get
>>> cut and formed to make the back straps (it forms easily). Wonder if
>>> there is any electolysis between two different aluminum alloys?
>>>
>>> Man, there is always something!
>>>
>>> Jeff
>>>
>>>>
>>>> Mike
>>
>>
>> If you look at the makeup of the alloys here, there is not much
>> difference.
>> http://www.alufoil.com/products.htm
>
> Thanks,
>
> The guys over at Solkote said not to worry about elctrolysis between the
> copper tubes and aluminum fins (I told him I was priming the copper and
> he said not to bother).
>
> Opinions?
>
> Jeff
I think there has to be a difference in potential to cause a problem.
The copper would have to be at a different potential that the aluminum
to cause migration. I don't think just tubes and fins would have that.
>
>> You might have some of that between copper and aluminum, but the Sunray
>> Solar people use copper tubes and aluminum fins.
>> http://www.sunraysolar.com/fintubes.php
>>
>>>>
>>>>
>>>>
>>>>
>>>>> Hi Mike,
>>>>>
>>>>> I haven't cut the copper yet, but I was going for 4 tube in my ~ 2'
>>>>> wide box. That would have been ~ 140mm, but that is before I bought a
>>>>> micrometer and found my aluminum was not 24 gauge (with the back brace
>>>>> aluminum and solar paint I should be able to step that down form 22
>>>>> gauge)! Thanks for keeping up with me!
>>>>>
>>>>> Cheers,
>>>>> Jeff
>>>>>
>>>>>
>>>>>> Hi Jeff
>>>>>>
>>>>>> Use 2 pieces riveted together with your copper riser tubes in the
>>>>
>>>>
>>>> middle,
>>>>
>>>>>> this will effectively double the thickness allowing
>>>>>> better heat transfer to the copper tubes. Uses double the amount of
>>>>>> materials, but at least can use what you have. Make the riser spacing
>>>>
>>>>
>>>> 125mm
>>>>
>>>>>> Mike
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>> I measured the aluminum flashing I bought for the absorber fins
>>>>>>> and it
>>>>>>> comes in at .01". Thinner than I need.
>>>>>>>
>>>>>>> I remember someone here had a source for aluminum (that required a
>>>>>>> request). Does anyone know a good place to buy aluminum? I'm stuck
>>>>>>> until
>>>>>>> I can get by that...
>>>>>>>
>>>>>>> Jeff
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>
>>>>
Posted by Mike on October 17, 2006, 7:36 am
Electrolysis will not be an issue if the aluminum or copper tubes are primed
with an etching primer or if the aluminum is anodized.
There has to be moisture present to cause the problem. There is always some
water vapor in the air that over some period of years will cause a problem -
but will considerably reduced if one of the surfaces is sealed.
Mike
> >>
> >>
> >>> Mike wrote:
> >>>
> >>>> Aluminum can be difficuilt to bend unless you have the right tools,
the
> >>>> thinner stuff will be easier to work with if youre using some sort of
> >>>> DIY
> >>>> home made press.
> >>>
> >>>
> >>> I was thinking about keeping the thin stuff and buying something a
> >>> little thicker for a flat plat on front. The thinner stuff will get
> >>> cut and formed to make the back straps (it forms easily). Wonder if
> >>> there is any electolysis between two different aluminum alloys?
> >>>
> >>> Man, there is always something!
> >>>
> >>> Jeff
> >>>
> >>>>
> >>>> Mike
> >>
> >>
> >> If you look at the makeup of the alloys here, there is not much
> >> difference.
> >> http://www.alufoil.com/products.htm
> >
> > Thanks,
> >
> > The guys over at Solkote said not to worry about elctrolysis between the
> > copper tubes and aluminum fins (I told him I was priming the copper and
> > he said not to bother).
> >
> > Opinions?
> >
> > Jeff
> I think there has to be a difference in potential to cause a problem.
> The copper would have to be at a different potential that the aluminum
> to cause migration. I don't think just tubes and fins would have that.
> >
> >> You might have some of that between copper and aluminum, but the
Sunray
> >> Solar people use copper tubes and aluminum fins.
> >> http://www.sunraysolar.com/fintubes.php
> >>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>> Hi Mike,
> >>>>>
> >>>>> I haven't cut the copper yet, but I was going for 4 tube in my ~
2'
> >>>>> wide box. That would have been ~ 140mm, but that is before I bought
a
> >>>>> micrometer and found my aluminum was not 24 gauge (with the back
brace
> >>>>> aluminum and solar paint I should be able to step that down form 22
> >>>>> gauge)! Thanks for keeping up with me!
> >>>>>
> >>>>> Cheers,
> >>>>> Jeff
> >>>>>
> >>>>>
> >>>>>> Hi Jeff
> >>>>>>
> >>>>>> Use 2 pieces riveted together with your copper riser tubes in the
> >>>>
> >>>>
> >>>> middle,
> >>>>
> >>>>>> this will effectively double the thickness allowing
> >>>>>> better heat transfer to the copper tubes. Uses double the amount of
> >>>>>> materials, but at least can use what you have. Make the riser
spacing
> >>>>
> >>>>
> >>>> 125mm
> >>>>
> >>>>>> Mike
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>> I measured the aluminum flashing I bought for the absorber fins
> >>>>>>> and it
> >>>>>>> comes in at .01". Thinner than I need.
> >>>>>>>
> >>>>>>> I remember someone here had a source for aluminum (that required
a
> >>>>>>> request). Does anyone know a good place to buy aluminum? I'm stuck
> >>>>>>> until
> >>>>>>> I can get by that...
> >>>>>>>
> >>>>>>> Jeff
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>
> >>>>
Posted by Steve Shantz on October 15, 2006, 10:01 pm
Jeff wrote:
> I measured the aluminum flashing I bought for the absorber fins and it
> comes in at .01". Thinner than I need.
> I remember someone here had a source for aluminum (that required a
> request). Does anyone know a good place to buy aluminum? I'm stuck until
> I can get by that...
> Jeff
Try All Foils Inc. I bought untempered foil for my staple up radiant
system. Great people to work with. They have about anything you want
for very good prices. http://www.allfoils.com/
Steve
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>> Aluminum can be difficuilt to bend unless you have the right tools, the
>> thinner stuff will be easier to work with if youre using some sort of DIY
>> home made press.
>
> I was thinking about keeping the thin stuff and buying something a
> little thicker for a flat plat on front. The thinner stuff will get cut
> and formed to make the back straps (it forms easily). Wonder if there is
> any electolysis between two different aluminum alloys?
>
> Man, there is always something!
>
> Jeff
>>
>> Mike