A solar storage tank is a reservoir that separates the solar energy supply from the energy collection. That is to say, it is frequent, especially in the field of solar energy, that the electrical power that one wants to use does not correspond to the electric power that is being obtained at a certain moment. For example, hot water may be required at night, but solar radiation is not available to heat it.
When the system needs, for example, domestic hot water the accumulator supplies this hot water and replaces it with cold water. The cold water will pass through the circuit of solar collectors exposed to solar radiation and increase its thermal energy. The hot water returns to the accumulator for when it is needed.
The solar accumulator consists of a metal tank made of synthetic material and insulated. In turn, the accumulator incorporates one or two heat exchangers or heat exchangers into its installation. These exchangers allow you to maximize your safety to avoid the risk of leakage and loss of thermal energy.
The accumulator is in vertical position. In this way, temperature stratification is executed more easily and effectively, so it is not necessary that the entire tank is at the set temperature. With this vertical position of the accumulator a higher thermal efficiency of the solar collectors is obtained, and the thermal losses due to the thermodynamics of the elements are again avoided.
Types of solar accumulators
The size of the solar installation is the most important element to choose a type of accumulator or another.
For small or medium-sized structures it is usual for the tank itself to also contain drinking water. On the other hand, in thermal solar installations of large and complex dimensions, it is essential that other intermediate inertial deposits are gradually established, in order to store in them the thermal energy that will subsequently be transferred to the solar accumulator.
In addition, depending on whether the heat exchangers are outside or located inside the condenser, we can obtain other variants. If the tank does not have the built-in exchanger, the water is heated outside, while, if it is included inside, both the water accumulation and its subsequent temperature rise are produced within the same tank.
The accumulator can be above the solar collectors or elsewhere in the installation. In the first case, it is a solar thermosiphon system; The fluid that circulates between the solar collectors and the accumulator does not require pumping. In the second step, a contribution of electric energy is required to pump the fluid. In these cases, the energy provided may come from another source of renewable energy or directly from the electricity grid.
Accumulators for photovoltaic solar energy
In the sector of photovoltaic solar energy, the accumulator is the element of the installation capable of storing the electrical energy. This energy will later be transformed into chemical energy.
It consists of several batteries connected together in series or in parallel.
The objective of the photovoltaic accumulators is to store the electrical energy generated by the photovoltaic solar panel. Once the system requires electricity, it will be provided by the accumulator.
Last review: April 25, 2019