The solar water heating systems are classified into two types, they are:
Active Solar Heating System:
The active solar system consist controls and circulation pumps for the operation.
The active solar heating systems are two types:
Passive Solar Heating Systems:
As compared to active solar heating systems these systems are low in cost but are less effective. And these devices are more reliable. The passive solar heating systems doesn’t consist a ny controls and circulations as active heating systems.
The passive heating systems are classified into two types:
The solar collectors are two types, which are used for residential applications
Flat plate collector:There are two kinds of flat plate collectors namely glazed and unglazed. The glazed collectors are weather proofed and it uses a dark absorber plate under either one or two glass. The unglazed collectors utilized for heating the solar pool. It uses dark absorber plate made of metal polymer without any fencing.
Integral collector storage systems:
The integral collector storage systems which are also called ICS batch systems have one or more black tanks or tubes that are insulated in a glazed box. When the cold water goes through the solar collector then it boil/heat the water. The boil water then flow through the conventional water heater where we get hot water. These storage systems mostly used mildly freezing places because there are chances that the outdoor pipes might freeze in extreme cool temperatures.
Evacuated tube solar collectors:
They consist of transparent glass tubes where each tube consists of a glass outer tube and a metal absorber connected to a paddle. The paddle takes heat from the sun but these collectors prohibitly gives energy loss. These type of system used in commercial applications
The solar water heating systems however requires a backup system during cloudy days and when the demanding of the system is increases. The conventional storage water heater systems are used as backup and are sometimes available in the package of solar water heaters. The system can also be a part of the solar collector like the rooftop tanks also with the thermosyphon system. Already we have know that an integral collector storage system stores hot water in addition to collecting the solar energy it is packed with the tank less or demand type.
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