Download: Self-draining solar: PAW Drainbloc solar power station

Solar station for managing a drained solar system also called solar drainback

Technical presentation of the PAW DrainBloc solar power plant for solar drain systems.

Why a solar system to empty?

During good irradiation, the sensors quickly heat up the storage tank. But when heat is not required, for example during the holidays, the sensors cannot transmit heat to the already hot storage tank.

The installation overheats and the solar fluid vaporizes. The pressure forces the hot solar fluid into the tubes. This state is called stagnation and even if it is not a serious incident, the high temperatures and pressures are critical and undesirable.

The solar fluid vaporizing in the sensors can suffer.

In conventional solar systems, steam is even pushed into the solar station and the expansion tank. Seals and diaphragms are negatively affected by heat, which accelerates the aging of components and reduces the service life of the installation.

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The DrainBloC offers a brilliant solution: the self-emptying sensor field. As the installation is not completely filled with the heat transfer fluid, the sensor is automatically emptied as soon as the circulator is cut. The heat transfer fluid is collected in the DrainBloC's integrated tank. As there is no longer any heat transfer fluid in the hot collector field, steam and pressure are not formed. In this system stagnation is simply not possible, an expansion tank is therefore not necessary.

As soon as the circulator is put back into operation, the sensor field is filled with the heat transfer fluid of the tank and the heat can be transported to the storage tank.

Main advantages of a drained solar system:

- no stagnation
- no risk of frost
- heat transfer fluid fully compatible with the environment [water]
- improved heat transport
- improved heat transfer
- optimal heat storage capacity

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More: drain solar panels, why it's better than a pressurized system.

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