solar help please

Bob Gagnon plumbing and heating

I'm adding a large array of thermomax tubes to my solar heating system. looking at the enclosed drawings do you have any ideas or suggestions? Right now I'm working on the heat exchanger coils in the storage tank. do I have the reverse returns piped correctly? do i need seperate shutoffs on each loop to purge? How many loops of 1/2" copper should I use for each application? I made a heat exchanger 7' long, using 3- 1/2" x 40' coil, but I could easily use 5 or 6 1/2' coils to make the other exchangers. any ideas or suggestions would be greatly appreciated. thanks, bob <A HREF="http://www.heatinghelp.com/getListed.cfm?id=331&Step=30">To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"</A>