Solar Collectors

Energy from the sun is obtained using solar collectors. Solar collectors are designed to absorb solar rays and convert the resulting radiation into thermal energy. Solar collectors are usually used to produce hot water. In solar collectors, a special non-freezing solar fluid is used as the heat carrier, circulating from the hot water boiler to the solar collector. Propylene glycol is environmentally friendly and does not freeze in winter.

The main component of a solar collector system is the collector, which is usually placed on the roof of a building, less often on a facade or on the ground. Inside the building there is a hot water boiler, a pump station and a control unit. Operating parameters are set in the control unit. The circulation pump switches on when the collector has warmed up and has a higher temperature than the storage boiler or the system to which heat is being transferred. Solar collectors are connected to the hot water boiler and pump station using two flexible stainless steel or copper pipes, the diameter of which corresponds to the output of the solar panels.

The main element in any solar collector system is the radiation absorber, which largely determines the collector's performance, durability and efficiency. The collector's structural design and the materials used also play an important role. Thicker thermal insulation allows the collectors to be used at lower temperatures with high efficiency.

COMMODUS offers solar collectors, system components, as well as ready-made solar collector system packages. Ready-made system packages help you better understand what such systems consist of, what the total installation costs are, and to do it more cheaply.

HEWALEX Flat Plate Solar Collectors

HEWALEX Flat Plate Solar Collectors

Flat plate solar collectors have a large glass surface and a large solar energy absorption area. Most of the solar energy reaching the collector surface is utilised. The solar collector is made from materials that ensure a long service life and the retention of collector parameters over a long period.

A well-designed solar energy system in Latvian conditions should provide 50 to 60% of the annual domestic hot water requirement for a household, depending on the number of users. To meet this demand, it is assumed that each person requires 0.8 to 1.5m² of active absorption surface area. Additionally, when determining the hot water boiler volume, a standard indicator of daily hot water consumption per person of 40-60l of water at a temperature of 550C can be applied.

We offer ready-made systems for purchase, or we can modify and adapt a system individually!

HEWALEX flat plate collectors have the following advantages:

  • Copper absorber coated with titanium or black chrome
  • Excellent price-to-output ratio
  • Very versatile solutions. Possibility to combine up to 8 solar collectors in a row
HEWALEX Vacuum Solar Collectors

HEWALEX Vacuum Solar Collectors

Vacuum tube collectors achieve higher efficiency compared to flat plate solar collectors. The advantage of this type of solar collector is efficient operation at low ambient temperatures. The vacuum collector is separated from the surrounding environment by a vacuum space, which allows heat losses to the environment through conduction and convection to be almost completely eliminated.

The absorber surface, which converts solar radiation energy into heat, has a cylindrical shape. Therefore, the area illuminated by the sun remains constant in the morning, at midday and in the evening. The collector's heat output does not change depending on the angle of incidence of the sun's rays, which is characteristic of flat plate solar collectors. The special inverted hydraulic connection design in the KSR10 collector protects the circulating fluid from overheating during the stagnation stage.

A significant advantage of the Hewalex KSR10 solar collector is the possibility to install it in any position (without a slope), which allows this collector to be mounted on a building facade. Individual tubes can be rotated to compensate for an unfavourable position relative to the angle of incidence of the sun's rays.

We offer various types of mounting, both for installation on a sloped roof, flat roof, facade or on the ground.

HEWALEX vacuum collectors have the following advantages:

  • Efficiency of 85%
  • Vacuum tubes manufactured by the leading European tube manufacturer NARVA (Germany)
  • Absorbers made entirely of copper and coated with a PVD layer (TiNOX Classic)
  • Additional anti-reflective coating on both sides increases the transmission of solar radiation to the inside of the glass tube by approximately 5%
  • Special protection in case of overheating – steam pushes the glycol out of the collector
  • Excellent price-to-output ratio and overall annual yield
  • Very versatile solutions. The collector tubes can be rotated to face directly towards the southern sun
  • Tubes do not shade one another at a low sun angle