| Advantages
of a Closed Loop Solar Water Heating System |
Closed
Loop system allows simple switching between heat exchangers for multiple
applications, as well as excellent freeze protection. Special solar
domestic hot water tanks are available with internal heat exchangers
(coils), with or without electric backup. Twin coil tanks are also
available that allow surplus solar energy to be directed to spa, pool,
floor etc. The top coil can also be connected to the house boiler as a
DHW backup. No freeze sensors or drain down valves are necessary. |
It is
generally more complicated than an open loop system, because either a
tank with a heat exchange coil or an external heat exchanger is
required. As a heat exchanger is required the collector loop will run at
slightly higher temperatures than an open loop system. The collector
loop needs to be pressurized. (8 -12 psi) The antifreeze may need to be
recharged on a 3 to 5 year basis. |
Disadvantages
of a Closed Loop Solar Water Heating System |
