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NRG's low-pressure solar thermal model.

Solar equipment manufacturer NRG Technologies offers thermal solar systems in low-pressure and high-pressure models. The low-pressure gravity feed complete system consists of a vacuum glass tube collector, an insulated storage tank and optional stand parts (make up tank). The evacuated glass tubes are filled with water and exposed to sun, thus heating up the water in the glass tubes.

As the specific gravity of cold water is heavier than hot water, the hot water in the glass tubes starts rising in the insulated water tank, and the cold water in the insulated water tank sinks into the glass tubes. As this cycle is repeated, water in the solar water heater gets heated. This process is known as Thermosyphon and is based on natural convection.

The high-pressure Direct Pressure Solar Water Heating System features evacuated tubes and heat pipe. The evacuated tube absorbs solar energy and converts it into heat energy, this energy is then used in the process of heating water.

The Solabox low-pressure system features a 100-L gravity feed solar geyser.

Advantages:

° Able to absorb solar energy from infrared rays, which can pass through cloud cover, thereby providing excellent results on cloudy days.
° Wind and low temperatures have less impact on the efficiency of these tubes due to their insulation properties.
° The round shape of the tubes provide the following benefits: The amount of solar radiation striking the collector is relatively constant from morning to afternoon resulting in a superior absorption rate. The sun’s rays are always striking the tubes’ surface at 90°, thereby minimizing reflection and maximizing absorptions. Sunlight which is reflected off the glass surface or that passes between the tubes is reflected back to the under side of the tube by a reflective backing panel. The outer tube is made of strong transparent borosilicate glass that is able to resist hail up to 25mm in diameter. A copper heat pipe is used for rapid heat transfer

Heat Exchange Manifold – The heat pipe transmits heat to its tip which is plugged into the collector’s heat transfer manifold. The water runs through the manifold thereby allowing the heat to be transferred from the copper heat pipe to the water.

Photovoltaic Circulating Pump – the solar circulating pump reticulates the water from the heat exchange manifold to the tank, it is attached to a photovoltaic panel utilizing only the sun’s energy to circulate the water. The water only needs to be circulated during the day while the solar collector is efficient, making this a great feature for the split system.

Direct Pressure Solar Water Heating System Benefits:

NRG's high-pressure solar thermal system.

° Suitable for mains water pressure of up to 6 Bar
° Stable solar conversion throughout the day
° Ideal for the following installations: Large Scale (Commercial & Industrial), Small & Large Developments, Household, Low cost Housing Developments, Hospitals, Guest houses, Hotels etc.
° Contributes to a saving of up to 45% of your electricity consumption with Technology that is highly efficient, reliable & environmentally friendly (10-15 year life expectancy)

NRG Technologies www.nrgtechnologies.co.za