Solar Water Heater Open System 100 Liters Pressure-Free BERG NSF100

Solar water heater open system 100 liters without pressure BERG NSF100 is a solar system of open type with a capacity of 100 liters. It includes mounting elements and silicone rings, an inlet for the heater, a supplementary tank with a stainless steel float of 3 liters capacity, and 10 borosilicate glass tubes.

• Solar system - open type
• Capacity - 100 liters
• Mounting elements and silicone rings
• Heater inlet - 1 pc.
• Supplementary tank with stainless steel float - 3L
• Borosilicate glass tubes - 10 pcs.

Material:

• High-quality stainless steel SUS304-2B, thickness: 0.31 ~ 0.5 mm
• Outer tank: high-quality stainless steel, thickness: 0.31 ~ 0.5 mm
• Insulation: 50~55 mm polyurethane foam
• Vacuum tube: CU/SS-AL/N - 10 pcs.
• Frame: stainless steel/aluminum alloy, thickness: 1.2 ~ 2 mm
• Filling tank: 3L stainless steel
• Available accessories: filling tank, solar controller, electric heater, magnetic rod, thermostatic mixing valve

Solar systems of this type capture up to 95% of sunlight thanks to the high-efficiency coating of the vacuum tubes. They operate effectively even in weaker sunlight, as the vacuum tubes have strong absorbing properties.

Main processes in the system:

• Solar absorption: Solar thermal energy is absorbed in the vacuum tubes and converted into concentrated heat.
• Solar heat transfer: The heat pipes contain copper cores filled with heat transfer gas, which carries the thermal energy to the main copper pipe.
• Solar heat storage: The thermal expansion of the gas transfers the solution (water or other liquid) from the tubes to the main copper pipe, raising the temperature by 5-10 °C.

This system quickly and efficiently transfers the absorbed thermal energy through the vacuum tubes to the collector core. The liquid boils at the base of the tube and rises in a gaseous state. The heat from the copper tube is released to the main copper pipe, where the liquid condenses and returns to the base, with the process continuously repeating.

The vacuum tubes are the energy absorbers for solar water heaters. They convert solar energy into heat for hot water use. This type of tube is preferred due to its reliability, high efficiency, performance, and low production costs.

Tank - heat exchanger

For the system to function properly, the tank must be positioned above the collector. The lack of appropriate height difference can lead to temperature loss at night due to the phenomenon of backflow, where the hot liquid moves in reverse and cools in the collector.

The hot water tank is designed to operate without pressure, making it safe to use. The water temperature can reach 90-95 °C, so the outer and inner walls of the tank are made of stainless steel with a thickness of 0.5 mm, type SUS304, certified for toxin-free use.

Insulation is provided by 50 mm polyurethane foam, which effectively retains heat. Stainless steel is a corrosion-resistant material processed with an advanced casting process that eliminates the risk of rusting.

Advantages:

• Independence from rising electricity prices.
• No pump, pipes, or additional devices are required for the collector to operate.
• Year-round use, including in winter with sufficient sunlight.
• The materials of the stand and water tank are made of stainless steel, preventing corrosion.
• The temperature in the vacuum tube reaches up to 250 °C, and the water heats up to 100 °C in about 3 hours.
• The system operates without pressure and is completely safe.
• The water tank, pipes, and structure withstand hail up to 25 mm in size.
• The absorbing surface of the collector absorbs about 93-94% of solar rays.
• The system continues to operate even if one of the tubes breaks, as long as the broken tube is sealed.
• Low costs for connecting to the water system.
• Very low temperature losses due to the good insulation of the vacuum environment and water transport pipes.
• The design of the collector provides good wind resistance.
• Effective operation even with orientation different from the optimal south, thanks to the round shape of the tubes.
• Up to twice as effective during the winter period compared to flat collectors.
• Does not retain snow and dust.

Instructions