Solar collector receives solar radiation, heats the thermal media (water or antifreeze fluid), and transfers the heat to the water in the storage tank from where the hot water is available for use. Thermosiphon is a method of passive heat transfer by natural convection.
Solar water heaters that are based on natural convection method are called thermosiphon solar water heaters.
There are various types of thermosiphon solar water heaters available such as direct, indirect, pressurized, and non-pressurized types. Depending on the requirements and suitability, proper type of equipment must be used for reliability and efficient tapping.
Generally, storage tanks and collectors are integrated on a single frame. However, solar collectors and tanks can be separately installed with condition, that the tanks must always be at a higher level from the solar collector, with no sag/bend to the interconnecting pipe between them.
As the thermosiphon solar water heater does not require a pump and many interconnecting pipelines, the system has minimal maintenance and operation cost that considered as advantages of the thermosiphon system.
Capacities start from 150 litres to 300 Litres. Smaller sized systems can be cascaded for large hot water requirements.
This type of solar water heater has pumps to circulate thermal media (water, or glycol), to exchange heat from the solar collector to the water storage tank. The thermal media circulates and collects heat from the collector and transfers to the drain back storage tank. The solar pump activates and heat transfer occurs only when it is required, and as a result, heating of the water happens in a controlled manner. As the media drains to the drain back tank from the collector freely, the storage tank always needs to be installed below the collector, and the interconnecting pipes must have slope.
Tanks can be installed separately from the collector
Electric backup heater with auto temperature control
Remote monitoring & Control options
This type solar water heater has pumps to circulate thermal media, (water, or glycol) to exchange heat from the solar collector to the water storage tank. Solar collectors and storage tanks installed at different locations of the building and the heat transfer happens through high efficiency pumps controlled by microprocessor-based controls.