Hello Indyplumber, welcome to ER
Quote:
Originally Posted by Indyplumber
One question I have is would the efficiency be greater is the solar heated liquid circulated through the outside tube instead of the inside tube? Im getting ready to build my own system and thought it would be better that way.
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No, it is more efficient when the warmer liquid is circulating inside the cooler liquid. That way the temperature differential through the outside wall is smaller, wasting less heat. In theory, if the heat exchanger was ideally insulated, then this wouldn't make any difference, but no insulation is perfect.