DEMONSTRATION MODEL
(for educational purposes)

The PROECO YL-MINI Solar System consists of:
- a vacuum solar collector (6 tubes with triple ALN/AIN-SS/CU absorption layer, 500 mm length)
- an insulated stainless steel water tank with a capacity of 30 l.
- a steel frame

Application:

Ideal solution for educational purposes (presentations).

Construction:

The solar collector consists of vacuum tubes made of borosilicate glass. The high operational safety of borosilicate glass was achieved through the use of an appropriate mixture of SiO2 and B2O3 oxides, resulting in a product with good chemical resistance and extraordinary purity and homogeneity. Borosilicate glass is environmentally friendly and can be recycled many times. The use of a thermal tempering process combined with the low thermal expansion typical of borosilicate glass provides particularly high resistance to temperature changes compared to ordinary glass. The tubes are resistant to hail up to 25 mm. The use of tubes with diameters of 47 mm and 58 mm allows for concentric placement of one inside the other. The air between the tubes is pumped out and the tubes are welded together.
Solar radiation falling on the absorber located on the inner tube is converted into thermal energy, heating the interior of the tube. The vacuum between the tubes is an excellent insulator and prevents heat loss to the atmosphere. The tank is made of SUS 304-2B stainless steel and is insulated with polyurethane foam with a thickness of at least 50 mm.
A small expansion tank can be installed for automatic water replenishment in the tank. Once completely full, the inlet valve is automatically closed by a float.

Principle of operation:

There is water in the tank and tubes. Under the influence of sunlight, the water in the tubes heats up. Due to convection movements, it rises up into the tank. Water undergoes continuous circulation between the tank and the vacuum tubes, which causes a constant increase in water temperature. The high efficiency of the collector results from its ability to absorb diffuse solar radiation (e.g., on cloudy days) and minimize heat loss. The collector also performs excellently in winter. It obtains energy not only from direct sunlight but also from light reflected from snow.
The system is used for gravity draining of hot water from the tank. Additionally, a small expansion tank can be installed for automatic water replenishment directly from the water supply network. The system does not require pumps or controllers for correct operation, which makes it very reliable. The open circuit means that even boiling water does not cause a pressure increase inside the tank. Thanks to this, the system is failure-free and safe. Of course, if there is a need to supply hot water above the tank level, a pump can be used.

Advantages:

- Higher efficiency of the vacuum collector than a standard flat-plate collector.
- Simple construction, low failure rate - tube lifespan over 15 years.
- Direct connection between the collector and the tank (no heat loss).
- Excellent tank insulation (daily water temperature loss 6 - 10 degrees C).
- No need for pumps and controllers.
- Simple installation not requiring modification of the existing system.
- Easy maintenance and self-assembly capability.

Installation and operation manual:

Manual YL.pdf

Installation manual on inclined surface (annex).pdf

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Warranty: 3 years