The indirect solar system ite consists of an indirect tank which is connected to a boiler electric gas or oil or water heater.
Indirect solar water heater system.
Swh systems which do not include a heat exchanger are called direct systems shown in fig.
The ite as well as the its can be part of a solar water heating system.
Active indirect systems in which a heat transfer fluid like propylene glycol is heated up within the solar collectors and then transfers the heat to the water supply with a heat exchanger in a closed loop system.
Indirect solar system ite.
Active solar heaters are primarily of three types direct indirect and drain.
6 5 16 in a direct system the service water is directly circulated between the water tank and the collector while in an indirect system a heat transfer fluid usually antifreeze distilled water.
Some heat loss occurs while the transfer fluid circulates the system.
The optimum installation can be constructed by using different accessories.
Indirect solar water drainback systems are also a indirect design that use a heat exchanger to separate the collector loop from the potable water.
Conventional storage water heaters usually provide backup and may already be part of the solar system package.
Instead of relying on glycol for freeze protection this system allows all the water in the array to drain back from the array and into a storage vessel in the solar loop when the pump is turned off.