Indirect Solar Water Heating System Definition

Solar water heating swh is the conversion of sunlight into heat for water heating using a solar thermal collector a variety of configurations is available at varying cost to provide solutions in different climates and latitudes. 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. Swhs are widely used for residential and some industrial applications.

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Indirect solar water heating systems circulate a fluid typically a mixture of water and glycol in a circuit between the rooftop thermal collector and a heat.

Indirect solar water heating system definition.

Indirect solar water drainback systems are also a indirect design that use a heat exchanger to separate the collector loop from the potable water. Another benefit of indirect circulation systems is that they can be attached to multiple heat exchangers and used to heat different lines of water. This is beneficial if your home has multiple hot water tanks or if you want to heat both your home s hot water and your pool or spa using the same system. 6 4 while the swhs which are fitted with heat exchangers are called indirect systems shown in fig.

Solar water heating systems almost always require a backup system for cloudy days and times of increased demand. An indirect water heater can also complement a solar collector providing any additional heating that cannot be supplied with solar radiation alone. 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. Indirect water heater systems can be fired by natural gas oil propane or electricity whichever heat source is used by the space heating boiler.

Swh systems which do not include a heat exchanger are called direct systems shown in fig. Conventional storage water heaters usually provide backup and may already be part of the solar system package. Direct solar water heating systems pass potable water through the thermal collector that eventually flows directly to the desired application the faucet the showerhead etc.