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These units suit single outlet facilities - running multiple showers simultaneously reduces the flow considerably, a bit like trying to run two garden sprinklers simultaneously.Nevertheless their lower cost and simplicity of management make them an attractive proposition for the right application.

How does it work? The beauty of the technology - simplicity
Our low maintenance system comprises a collector - a bank of evacuated tubes - directly coupled into a storage tank, inside of which a Cu coil heat exchanger is mounted.
While the tank is at low pressure, the high pressure supply is connected to the coil inlet, and the outlet feeds pre-heated water to your geyser under high pressure.
Supply is also connected to the small refill tank. After your solar water heater system is installed, the municipal supply water fills the tank and the vacuum tubes via the refill tank. When the tank is full of the circulation water, the ball cock in the refill tank will turn off the inlet supply. 
The refill tank has the function to keep the storage tank filled up with water at low pressure:
  • The circulating water in the tank and vacuum tubes expands when it is heated, and in this instance the refill tank stores the expanded hot water.
  • The water in the tank and vacuum tubes may reduce because of venting evaporation, and in this instance the water will be filled by the refill tank automatically. When the tank is filled up with water, it will stop.
 To summarise : Why is it the lowest maintenance?
  • no topping up or refill maintenance (its automatic) of expensive circulation fluid (its water), and
  • no bursting pressure on the storage tank(the tank is at atmospheric pressure, the supply is at high pressure)
 
The Imperatives for solar - is it more than an investment? click here                  
To Contact us click here                   To make an enquiry click here.                         To order click here      

Simplicity – how our solar water heating system works

 

The vacuum tubes absorb the sun's rays and turn the rays into heat energy, heating the water in the tubes. As the temperature of the water raises the density drops slightly causing the hot water in the tubes to rise into the tank, and the cold water in the tank to sink down into the tubes.
 
This natural circulation (thermosiphon effect) heats the water in the stainless steel tank which is encased by a polyurethane layer protected by a steel outer casing. The insulation later and the vacuum in the tubes protect the circulating water from the elements and prevent heat escaping from the system.
The vacuum tubes heat the water in the tank, but users don't use the water in it directly. The storage tank sits at low pressure prolonging its life.

The high pressure cold water supply feeds into the exchanger from one side, the water is heated by the exchanger, and then the hot water comes out from the other side ready for use.
 

No pumps, no glycol, inexpensive copper tubing heat exchangers.

Working theory of our vacuum tubes

The vacuum tube is composed of an inner tube, outer tube, selective absorption layer, vacuum space, and inspiratory layer.
The space between the outer and inner tube is the vacuum space. Like a thermos flask, it insulates the inner tube from the outer tube preventing cold from entering, and heat from escaping.
At the bottom of the outer tube, there is an inspiratory layer which can be used to absorb the remnant air after evacuation of the tube in the production process, and can absorb the air which filters from the atmosphere into the vacuum tubes.
 
The inner tube to stores the circulating water. The outer wall of the inner tube is the selective absorption layer. The selective absorption layer transforms solar radiation into heat energy.
 
The radiation comes in many forms, particularly UV light which penetrates clouds and enables our system to operate even under low temperature and low light conditions.
 
The heat energy can't escape the vacuum layer, so heats up the water in the inner tube, causing circulation.
 
No absorption rods, no expensive circulating fluids.
The Imperatives for solar - is it more than an investment? click here           
To Contact us click here                   To make an enquiry click here.                         To order click here 

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