【Construction】

The compact pressurized solar water heater consists of an insulated tank, vacuum tubes and a frame.

● The water tank is made of 1.2 to 3 mm thick SUS 304-2B stainless steel. The external insulation of the tank is made of highly dense polyurethane foam with a minimum thickness of 50 mm. In the tank there are technical openings for connection and drainage, as well as socket sockets into which we insert the tip of the "heat pipe" (condenser). The number of sleeves depends on the capacity of the reservoir. The factory pressure of the accumulator is 6 bar.

● Vacuum tubes are made of high quality borosilicate glass. There is a vacuum between the two layers of glass, which is an excellent insulator against heat loss. Triple absorbers of the latest generation  applied to glass for concentrating direct or diffuse solar radiation. The individual layers of the absorber are used to absorb solar radiation and convert it into heat energy. The task of the subsequent layers of the absorber is to keep as much energy as possible inside the vacuum tube, preventing it from being lost through infrared radiation. The temperature inside the pipe can reach nearly 300°C. Inside each vacuum tube, an aluminum heat sink is inserted, in its central part a copper tube (heat pipe) is placed. The copper used to produce the heat pipes is oxygen-free, ensuring long-term reliable operation of the pipes. Inside the heat pipe is a substance that starts boiling at 25°C.

●  The frame on which the water tank and vacuum tube are placed is carefully designed to be placed on a flat or sloped surface. The inclination of the frame is optimal for vacuum tubes for maximum efficiency.

【Working principle】

● Thanks to the three-layer absorber and the vacuum inside the vacuum tube, the sunlight falling on the vacuum tube is converted into heat energy. The temperature inside the pipe even reaches 300 ℃. An aluminum radiator in the middle of the vacuum tubes transmits the temperature to a copper tube (heat pipe) inserted into the central part of the radiator. Inside the copper heat pipe is a fast boiling substance that begins to boil at 25 degrees Celsius. 

● During boiling, the evaporated material rises to the top, releasing heat energy in a tube condenser (heat pipe), and then the vapor condenses downward, repeating the process. The tube's condenser is coated with thermal paste and inserted into the socket of the heat pipe sleeve mounted in the tray. The heating condenser of the heat pipe transfers temperature to the socket of the bushing through thermal paste, thereby heating the water in the tank. Hot water rises, cold water sinks. There is a pipe installed in the tank, and when the tap is turned on, we only get water from the upper part of the tank, while the cold water is introduced to the very bottom. 

● The water in the pressure tank is kept at constant pressure by the water supply pipe network, and is automatically replenished after the tap is turned on. The water tank is equipped with a pressure safety valve. When the water temperature is too high, the safety valve opens, and the hot water is released outside, and the cold water enters the water tank automatically. When the water temperature in the water tank drops, the valve automatically stops releasing the hot water. Due to the constant pressure of the water in the tank, our unit can be installed at a lower location and deliver the water to the upper floors of the building without any problem. The unit does not require any electrical equipment or expansion tanks in order to function properly, making it extremely reliable.