Kayema Energy Solutions (Pty) Ltd is able to supply any combination of the following systems::

An illustration of a closed loop system

Closed Loop (alt. indirect) refers to a system whereby the heating of the water within a solar water storage tank (geyser) is achieved indirectly, by circulating an externally heated fluid through a heat exchanger, without ever coming directly into contact with the potable water itself. A non-toxic glycol solution is used to transfer heat from the solar collectors to the water in the tank via the heat exchanger.
Open Loop (alt. direct) refers to a system in which the potable water from the geyser is passed through a solar collector, and is directly heated by the sun. There is no heat exchanger used in this type of system.
Split System refers to a design in which the solar collectors are separated from the tank and is normally only used when there is a substantial distance between the collector and the geyser. A split system can be either open (indirect) or closed (direct) loop.

An illustration of a thermosiphon system

Thermosiphon (alt. thermosyphon) refers to a method of passive heat exchange based on natural convection which circulates liquid in a vertical closed-loop circuit without requiring a conventional pump. Its intended purpose is to simplify the pumping of liquid and/or heat transfer, by avoiding the cost and complexity of a conventional liquid pump. The water tank must always be placed above the collectors in order for a thermosiphon system to work correctly


Solar Collectors
Kayema’s flat plate solar collectors are manufactured by leading Israeli manufacturers according to a proprietary design, using the highest quality materials and under ISO 9001:2000 QMS. Our collectors offer an unmatched level of efficiency and provide a significantly long life.

1. Transparent cover – 4 mm low iron tempered glass with a minimum transmittance of 91.5%.

2. Absorber plate- 0.2 mm copper plate welded ultrasonically to copper risers coated in either black chrome coating , high efficiency blue sputter or solar selective paint.

3. Frame – Collector’s frame is available in.
a) Extruded Aluminum, Anodize, or powder paint in standard grey color. Special color according customer requirements availble.
b) Galvanized white prepainted steel.

4. Copper risers – 3/8″,1/2″ copper tubes.

5. Manifold 7/8″ 11/8″ copper tubes welded to 3/4″ BSP female thread adaptors.

6. Aluminum foil- 100 microns Aluminum foil to protect polyurethane casting.

7. Insulation – CFC Halogen free polyurethane or high density rock wool boards.

8. Back plate – P.V.C /Polypropylene or Aluminum sheet.

All collectors undergo test pressure of 12 bars whereas permitted working pressure is 8 bars .