The Difference Between Pressurized and Non-Pressurized Solar Water Heaters

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Emergence of solar water heaters is undoubtedly a great invention for people.Solar energy has become the focus of attention because of its clear, continuous and safe advantages. There are many kinds of solar water heaters, which can be divided into Pressurized Solar Water Heaters and non-pressure solar water heater.

Non-pressurized Solar system

Non-pressurized system are also called straight-in all-glass vacuum tube solar water heaters. Because the vacuum collector and water tank are sealed by sealing rubber ring, they can not withstand pressure.The non-pressure solar water heater normally uses the non-pressure water shutdown, the efficiency is high and the service life is long. The low-pressure gravity system consists of a vacuum glass tube collector, an insulated storage tank and optional stand parts (make up tank). The water is delivered to the tank on the roof by a pump of some kind or from a water tower, which naturally means there is some pressure and then the evacuated glass tubes are filled with water and exposed to sun, thus heating up the water in the glass tubes.This system is completely compatible with shower pumps and other household pumps to add water pressure in the house.  But the tanks and the panels or tubes are not pressurized themselves.

Advantages

• Due to lower pressure and stress on the tank and collectors, it has a longer life than high pressure solar systems.
• Can provide hot water without external power such as pumps.
• Due to its simplicity, it is usually a cheaper option .
• It is more energy-efficient i.e it is highly effective in converting sunlight into heat.

Disadvantages

• Unless it is installed at a high level above the water outlets the water pressure will be very low.

Pressurized Solar system

Pressurized solar water heater also called phase change thermal conductivity full pressure solar water heater is typically characterized by an enclosed heating unit containing copper tubes connected indirectly to a tank. . The phase change thermal conductivity collector is composed of vacuum tube, phase change heat pipe and heat transfer aluminum wing. Because of the threaded connection between the phase change heat pipe and the water tank, and there is no liquid in the vacuum pipe, it can withstand pressure.The high-pressure Direct Pressure Solar Water Heating System features evacuated tubes and heat pipes. The heat pipes absorbs solar energy and converts it into heat energy, this energy is then used in the process of heating water. There is no direct connection between the heating fluids in the copper tubes and the water being heated.Pressurized systems allow you to have a closed loop and a circulation pump so that the water in the pipes is constantly pumped through the solar collectors where the water gets hot, then around all the pipes so there is always hot water instantly at the tap

Advantages of Pressurized Solar Water Heaters

• The water pressure can be very high hence luxurious showers.
• The tank or collectors can be located in more accessible or appropriate locations,i.e one can place the collectors far from the taps and showers.
• Works well with water pumps that have been installed
• The water temperature of confined type is first high and then low in the course of use, which is easy to master and easy to adapt to by users.
• They can sometimes be retrofitted to use existing storage tanks because the pressurized water tank is welded by high frequency welding, which can be directly connected with the water system and run automatically.

Disadvantages

• They are more expensive than low pressure solar heater systems
• Some models require power to run the pump and temperature differential controller – this can be overcome by installing a photovoltaic module.

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