Why you should buy a Solar water heater (SWH)?
- Especially designed to ensure maximum efficiency and long-lasting lifespan.
- Use of advanced materials that ensure ultimate efficiency.
- Certified with international standards such as ISO 9001:2008, Solar Key mark, CE which ensure the high quality of the products and the reliability of use.
- Continuous research and development, in order to provide improvements and incorporate of new technologies into designs and manufacturing processes.
- Many years of experience.
Diagram 1: Typical scheme of an installed SWH
Solar water heating provides a range of advantages such as:
- No moving parts, simple and easy installation.
- Save electricity and thus money. Nowadays, Electricity is becoming more and more expensive therefore is a good solution of saving money. Sunlight is free, so once you’ve paid for the initial installation your hot water costs will be reduced.
- Low Cost.
- Eco-friendly. Solar hot water is a green, renewable heating system and can reduce your carbon dioxide emissions.
- Almost maintenance free.
A solar water heater consists of:
- A flat plate solar collector: The collector usually comprises copper tubes welded to copper sheets (both coated with a highly absorbing black coating in order to maximize the absorption of sunlight) with a toughened glass sheet on top and insulating material at the back.
- A storage tank: kept at a height behind the collector and connecting pipes.
- Also, a pump and controller required to get the cold water from the tank to the panels for it to be heated.
Operation of SWH:
- Solar water heater operation is based on the principle of thermosiphonics.
- The system is generally installed on the roof.
- The collector should face the sun in order to maximize the absorption of sunlight.
- Water flows through the tubes, absorbs solar heat and becomes hot. The heated water goes up and it will be stored in the tank for further use. Therefore, the water remains hot, as the storage tank is insulated and heat losses are small. The cold water goes down from the other tube and we have a circular procedure.
- System integrates a supplementary heat source, usually electricity when the skies are overcast, with reduced solar penetration.
Diagram 2: Shows the operation of SWH
Diagram 3: Flow of water in the collector
Forced Circulation System
These are systems, where the inlet to the Solar Tank is through a Pressure Pump (or a very high tank) such that these systems instead of an air-vent, they have a safety valve to release the pressure build-up inside the tank. A forced circulation system needs sensors, a controller and a pump. The controller checks the value of temperature in the boiler and in the solar modules.
Forced-circulation hot-water distribution systems have several advantages:
- They permit the use of smaller pipe sizes and allow the installation of radiators at the same level as the boiler, or below, without impairing water circulation.
- By using a circulation pump, a positive flow of water is assured throughout the system.
In larger installations, especially where more than one building is served, forced circulation is almost invariably used. With the development of a circulation pump of moderate cost, the forced-circulation system is being used more in small heating installations.