glazed copper tube solar panels for pool heating
We have a number of good quality copper tube, glazed solar panels that we would like to use for heating our pool. We would use a heat exchanger, of course, so pool water would not pass through the copper tubes. I have tried to find comparisons on heat output of plastic (unglazed) panels vs glazed copper systems. All the info I find talks about glazed panel systems not being cost effective for pool-heating, which would be a factor if we were paying full price for the panels, but we already own them. What I'd like is a BTU output per square foot comparison, or something like that, without factoring in the cost. I am thinking that we would not need the 75 to 90% ratio with the glazed panels to get the same pool heat....right? I posted this on the pool and spa forum, but I am not sure they knew what I was referring to in the glazed panels, and replied that "BTU out put is the same for all brands." That can't be right when comparing black plastic unglazed to the glazed panels. Any help would be appreciated!