There, through a heat exchanger (coil), it transfers its calories solar water heating.
Store hot water
The solar is a metal tank well insulated. It is the subject of domestic water. The hot water is withdrawn immediately replaced by the same amount of cold water from the network, heated in turn by the liquid coolant.
Circulating the primary fluid
The liquid circulation can be natural or forced:
• In the first case, the liquid coolant circulates through the density difference with water balloon. As it is warmer, less dense that it raises naturally thermoregulation. The ball must be placed above the sensors. On this principle are designed solar water heaters in thermosyphon.
• In the second case, a small electric pump, the pump, sets in motion the coolant when it is hotter than hot water balloon. Its operation is controlled by a control device exploiting the differences in temperature: if the probe ball is warmer than the sensor, regulation cuts the circulator. Otherwise, the pump is restarted and the primary liquid heats its balloon.
The shortage of sunshine
Throughout the metropolis, we must deal with bad times (winter, spring and autumn, long period of bad weather). Solar energy can then ensure the entire production of this. Also, the balloon is equipped with a booster that takes over when needed, and restores the stock of this. These may include:
• a resistor (electric boost), often placed at half height of solar balloon;
• A coil (Hydraulic booster) connected to a boiler (gas, oil, wood) located downstream of the ball.
A second balloon fitted with an electric heater can also be used as extra.
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