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Solar Electricity (PV)

Solar Hot water systems provided by Solar Vision:

Solar energy helps protect the environment from pollution and damage that other heating can cause. Solar Visionoffers different systems designed to meet your usage. We will configure the system after a site survey for commercial/institutional applications. Talk to our experts about your needs and we can work out the best way to help you save water heating costs. Find the Solar Hot Water system that is most suitable for your application:

Solar Hot water systems

Low pressure systems:

These systems are ideally suited for rural areas, farms, lodges and other places where high-pressure municipal water and electricity is not available.  These system contain a 100 liter integral storage tank (excluding the water inside the tube) and more units are added for bigger applications. The one piece system should be placed as high as possible on the roof. The vacuum tubes are filled up with water from the tank, which is then heated up by the sun. As the water in the tubes gets warmer, it rises and mixes with the colder water from the tank. This process will eventually heat up all the water in the storage tank. This natural movement of fluid at different temperature is called “thermosiphon” effect where hot liquid rises and cold liquid sinks. The low pressure system has an integrated tank with high efficiency insulation to minimize heat losses during the night. The roof angle and exposure to the sun are critical to the efficiency of the system.

Pre-Heater System (click to enlarge)

Pre-Heater systems:

Pre-heater systems, sometimes referred to as pre-feed systems, provide mains pressure via a high efficiency copper coil heat exchanger located within the tank. These systems can be used in both low- and high-pressure water systems. Rather than using the water in the tank directly, the system uses a 45-60 m copper coil. When cold water flows through the coil it absorbs heat from the water inside the pre-heating tank. The tank serves therefore as a thermal store. The solar-heated water is then fed into your existing geyser. The main benefits of pre-heat systems are that you increase the amount of stored hot water available, no need for electricity and it is highly useful in areas with corrosive water (or high in calcium/magnesium).

Close-couple thermosiphon system.

Close-couple thermosiphon system.

The close-couple configuration is used in high-pressure water systems where the solar water tank and the collector will be in close proximity to each other (solar tank higher than the collector). The great advantage of this technology is that it does not require any pumps or controllers. In a direct system, the water that is heated will be used later. An indirect closed system will be recommended for water with high chalk content.

This system is also available in a split system, where the geyser and the collector are separated. While the heating panel is outside on the pitched roof, the geyser will be installed in the roof on a base above the top of the heating panel. The connecting pipes have to rise smoothly, which will allows the thermosiphon process to take place.

Pumped system

Pumped system

Split (active) Systems: The high pressure split pump system suits well for urban areas and has aesthetical advantages. Whereas the vacuum tube collectors are mounted on the roof, the special solar geyser is inside the house. It is also possible to convert some regular geysers to solar geysers, which will reduce your expenditures. The water is pumped from the geyser through the heating panel and back into the geyser. A temperature differential controller is used to control the pump. It turns the pump on when the water heating panel is hotter than the geyser water, and turns it off when the panel is no longer hotter than the water inside the geyser. This will maximize the system’s operation and maximize savings. Split systems are available in 150  – 250 liters water tanks. This system works either with existing electricity or a small solar panel to run the pumps and controllers.  This pumped system is slightly more expensive due to the added technology. However this solution will maximize the systems operation and consequently savings on your electricity bill. It can also be the best solution when your roof structure cannot support the weight of the solar geyser.