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what to use for Heat Xchanger

Ericjeeper Member Posts: 179
I am planning on atleast 190 square feet of panels. I can always leave the tank not all the way full.. if I am having troubles getting 1,000 gallons up to 90+degrees. Thanks to all who pitch in replies.


  • Ericjeeper
    Ericjeeper Member Posts: 179
    what to use for a heat exchanger

    I am planning on a solar setup. using glycol off of my in floor setup..

    I plan on a 1,000 gallon cistern tank buried and wrapped in four inches of styrofoam insulation and plastic wrap. putting plain ole water in the tank.. feeding the solar through the water using either a loop of gold tubing.. I meant copper.. Or what other options do I have??
    I have an abandoned water furnace which appears to have a large radiator type heat exchanger. Can I gut it and lay it into the tank? How about an old cast iron radiator?
    What would guve me the most bang for my buck?
  • hr
    hr Member Posts: 6,106
    Hard to beat copper coils

    about the only thing better would be finned coils to increase heat transfer.

    I used fin tube baseboard element once. The aluminum fins seemed to not like being in water, however.

    Plenty of transfer with plain copper coils.

    Sounds like a lot of tank capacity. How many square feet of collector will you have to drive that with? Better do some math. Hate to see you end up with only 70 degree water after all that time and effort.

    Your insulation R value sounds a little light also.

    The old Chiles Power Systems 1000 gallon tanks had 6" of foam on their tanks located INSIDE the building.

    Check out this link for some design ideas.


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