thermosiphon system(remote collection)
t includes a collector space, which intercedes between the direct sun and the living space and is distinct from the building structure. A thermosiphon heat flow occurs when a cool air or liquid naturally falls to the lowest point , and once heated by the sun rises up into an appropriately placed living space or storage mass, causing somewhat cooled air or liquid to fall again, so that a continuous heat gathering circulation is begun. Figure 6 shown the thermosiphon system schematically.
 
WORKING OF A THERMOSIPHON SYSTEM

The basic requirements of the thermosiphon system include, a collector space, usually a storage mass, and a method of distribution. Solar heat is collected on a dark metal or wood absorber surface, heating up the adjacent fluid, which the rises naturally into a storage mass for convective or radiant distribution. In the thermosiphon solar building type, the collector location is not fixed by the building and thus can take maximum advantage of sun exposure. system.

Thermosiphon systems rely on natural convection warm water rising to circulate water through the collectors and to the tank, which is located above the collector.

As water in the solar collector heats, it becomes lighter and rises naturally into the tank above. Meanwhile, the tank's cooler water below flows down pipes to the bottom of the collector, causing circulation throughout the 

Advantages/ Disadvantages

  • Storage can be thermally isolated or connected to living spaces.
  • Reverse convective flow can occur in improperly designed air or liquid system.
  • The collector area is separate from the building facade, the wall and opening design is flexible In a water system, freezing must be prevented