Integrated pressurized solar water heaters

Integrated Solar Heater Working Principle:

A compact pressurized solar water heater that uses heat pipes is a type of solar thermal system designed for efficient water heating. Here’s a general overview of how such a system works:

1. Solar Collector:
   • The system includes a solar collector, typically mounted on the roof or in an area with good sunlight exposure.
   • The collector is made up of evacuated tubes, each containing a heat pipe.
2. Evacuated Tubes and Heat Pipes:
   • Each evacuated tube contains a copper heat pipe. The heat pipe is a sealed, hollow tube containing a small amount of working fluid (such as a low-boiling-point liquid like water or alcohol) and a wick structure.
   • The heat pipe has two sections: the evaporator section (located in the solar collector) and the condenser section (located in the water tank).
3. Solar Absorption:
   • Sunlight is absorbed by the outer surface of the evacuated tube. This causes the working fluid in the heat pipe to evaporate into vapor in the evaporator section.
4. Heat Transfer:
   • The vapor moves to the condenser section of the heat pipe, which is located at the top of the water storage tank.
   • As the vapor reaches the condenser, it releases its latent heat, transferring the heat to the water in the tank. This causes the vapor to condense back into liquid.
5. Gravity-Driven Circulation:
   • Because the heat pipe is inclined and the condensed liquid in the condenser is denser, gravity causes the liquid to flow back to the evaporator section at the bottom of the heat pipe.
6. Pressurized Water Storage Tank:
   • The water storage tank is a pressure-bearing structure, designed to handle the pressure generated by the vaporization and condensation processes in the heat pipes.
   • The hot water in the tank is pressurized and can be supplied directly to plumbing fixtures.
7. Temperature Regulation:
   • The system may include temperature and pressure sensors, as well as a controller, to regulate the operation of the solar collector and ensure that the water temperature in the tank is within a safe and desired range.
8. Efficient Heat Transfer:
   • The use of heat pipes allows for efficient heat transfer, as the phase-change process (vaporization and condensation) enables the system to capture and transfer solar energy effectively.

Compact pressurized solar water heaters with heat pipes are known for their efficiency, reliability, and ability to provide hot water under various weather conditions. The pressurized system allows for better water pressure in comparison to non-pressurized systems.

Characteristics of an integrated solar water heater system’s key features:

Thermosyphon Principle:

The natural circulation of water is actively achieved through the thermosyphon principle. This means that hot water naturally rises and circulates through the system, eliminating the need for a pump.
The pressure of the hot water is large and equal to the running water pressure, ensuring efficient distribution.

Pressure-Bearing Water Tank:

The water tank is designed as a pressure-bearing structure with a test pressure of 1.2Mpa and a working pressure of 0.7Mpa. This indicates that the system is robust and can handle certain pressure conditions.
The inner tank material is made of food-grade stainless steel (SUS304 or 316L), ensuring water safety.
The inner tank is welded using fully automatic argon arc welding and double-sided argon gas protection, contributing to the durability of the tank. The inner tank is expected to have a service life of more than 15 years.

Polyurethane Insulation:

The solar water tank is insulated with polyurethane that has independent bubbles and a foaming density of 36KG/m3.
This insulation results in a minimal temperature drop of less than 2 °C of hot water within 12 hours.
The insulation is effective enough to maintain a temperature of 25 °C for 24 hours, and it is resistant to deformation over a long period.

Solar Heat Pipe:

The solar heat pipe utilizes a phase-change heat transfer design, leading to a fast start-up of heat energy.
The heat pipe can reach temperatures of up to 222 °C when exposed to sunlight, providing high-temperature hot water.
The system employs double-layer solar vacuum tubes with AL/N/AL/SS/CU coating, ensuring high absorption rates (>92%), low reflectivity (<8%), and an expected service life of 15 years.

These characteristics collectively make the integrated solar water heater efficient, durable, and capable of providing hot water using both solar and thermosyphon principles.
Keep in mind that proper installation and maintenance are crucial to ensure optimal performance over time.

Integrated Solar Heater Warranty

Water tank Solar vacuum tube and bracket: 5 years

Beside integrated pressurized solar water heaters, we have flat panel solar hot water heater for selection,

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