The most prevalent and popular solution to get access to hot
water supply at low cost. This eco-friendly technology
is widely used around the globe and provides an excellent alternative to conventional heating systems, with absolutely
no running cost. Therefore, installation costs are extremely low due to basic hardware requirements.
Thus, thermosiphons systems may be foreseen as individual water heating device in apartment houses, individual
rooms / resorts, standing as a relevant alternative to costly conventional central heating systems.
How does it work?
Athermosiphon solar water heating system has a tank mounted
above the collector. As the collector heats the water,
it rises to the storage tank, while heavier cold water sinks down to the collector. The system will be mounted on top
of the roof with a dedicated and adapted structure.
Each system is adapted to the local scenario, and a
relevant product for India not be suitable for China. Higher
price generally means better reliability and durability, varying 3-4 years to 15 years lifetime. Materials /
workmanship quality and terms of warranty are subjected to high variance.
Different types of systems are widely available in the
market, with significant gap in quality. The most popular
one in China uses evacuated heat pipes, whereas the most common one uses flat collectors.
These systems exist either with or without heat exchanger
(direct / indirect or open / close loop systems), which
allows installation in regions where frost may occur.
A household / hotel apartment with 4 people will be suited
with a system of 300 liters and 3 to 4 m2 of collecting
area on the roof. An electrical back- up is recommended to prevent hot water shortage during low irradiation periods
or temporary greater consumption. System capacity starts form 60L to 1000L.