Solar thermosiphon systems are solar power devices which has a natural flow of the working fluid. This particular flow uses convection currents which form in fluids at various temperatures.

The thermosiphon is the physical event wherein a convective flow is made in a hydraulic circuit because of the only difference in density in between fluid volumes at various temperatures. The thermosiphon basic principle is utilized in a few solar thermal energy systems, once the construction of the pipes enables it, that is, if the refrigerant path is on numerous levels and isn’t very long. The displacement of the heat transfer fluid, in between the solar panel as well as the hot water tank, is carried out solely by convection.

Whenever we heat a water tank in the bottom, it will lose density and goes up to the surface in which it cools. After that it returns to the bottom of the container and therefore a natural flow current is produced.

This is actually the basic principle of operation of the thermosiphon equipment, by which it would be necessary that:

  • The solar panel (heat sources) is always situated in the lower level compared to accumulator.
  • The primary circuit of the solar thermal installation is just as short as is possible and having a consistent slope which allows for natural circulation.

Benefits of a Solar Water Heater with Thermosiphon Effects

Simply by eradicating the necessity for a pump, thermosiphon systems lessen the entire complexity included in benefiting from solar power. Thermosiphon systems are therefore more dependable and call for little maintenance.

Considering that pumps need electricity to function, their exemption from thermosiphon systems make these systems considerably efficient to use. By way of easy precautions, thermosiphon heating systems can be guarded against undesirable conditions (like freezing). The HTF utilized in these systems usually features a non-toxic antifreeze ingredient which minimizes the possibility of equipment destruction in incredibly cold temperature. At the same time, the water tanks of thermosiphon systems are greatly insulated to store heat preventing the potable water supply from freezing. A few homes are large enough to get the water storage tank of the thermosiphon system set up within a roof structure, that could provide one more layer of protection.

Here’s the summary of the benefits:
  • Low investment costs
  • Frost-proof
  • Perfect heat storage and natural heat circulation
  • Long service life and minimal maintenance needs
  • No electricity required
  • Maximum heat transfer to the absorber
  • High-performance collectors
  • Easy transport and straightforward installation

Restrictions of Thermosiphon Systems

In spite of their dependability and efficiency, thermosiphon water heaters aren’t always ideal for any conditions. Provided the large load that thermosiphon systems put on in the roof framework of homes, the structural integrity of roof structures should be cautiously tested before the installation of such systems. The installation procedure alone is generally pretty costly since the majority of the parts must be transferred into the roof. Also, it is very hard to add in traditional electric or gas heating components into a thermosiphon system. Therefore, it’s nearly impossible to build a hybrid system which is very effective at utilizing both solar and utility power, having solar heating systems needing conventional water heaters as back-up to make sure that a home’s hot water requirements are fulfilled.

In spite of the particular restrictions of thermosiphon water heaters, they still provide a few unique benefits to homeowners who desire a dependable, low-maintenance method of harnessing solar power. Whenever designed and installed correctly, they could offer a continuous supply of hot water at minimum cost and could function for many years with almost no maintenance.