Solar Systems

Solar Systems
Solar Systems Solar Systems Solar Systems Solar Systems

System Description

Solar energy is an important alternative and accessible energy source. This energy coming to the earth surface is in the range of 1340-1390 W/m2. Solar collectors are just one of the methods how to get it.

Solar collectors can convert solar energy into thermal energy. Solar collectorswork on the principle of photothermal conversion, i.e. the conversion of solar radiation into thermal energy. The absorption surface transforms the incident solar radiation into heat and transfers it to a heat-conducting substance.

Energy saving

A well designed solar system can save a substantial part of the costs associated with the production of thermal energy.  Cost savings associated with the production of hot domestic water for a household are 55-75% depending on the availability of sunlight. Cost savingsassociated with heating are 25-40%. During the transition periods solar energy is used for hot water preheating, in the summer solar energy can be fully used for domestic hot water production.

In the past, solar collectorswere only a marginal energy source that had to be supplemented by another source for the major part of the year. However, a continuous development has enabled the use of solar energy for most of the year, not only for hot water production but also for heating or pool heating.

Solar collectors are generally divided into two groups:

  • flat solar collectors
  • tubular solar collectors

While flat solar collectors are mostly used for seasonal water heating, tube solar collectors, capable of achieving higher performance, can be used in a long term as a source of low-temperature heating method. Both collectors can help achieve a significant  energy saving.impact of radiation

FLAT SOLAR COLLECTOR CALIBER 216

scheme of flat collector A high-performance flat solar collector Caliber 216 provides a maximum energy gain through a special selective absorption layer applied by a technology in a vacuum environment. Flat solar collector Caliber 216 is characterized by a modern design, innovative geometry and weight of 38 kg. The level of technical efficiency of 0.787 is achieved by an effective insulating component.

 

Typ Caliber 216
Part number 180510
Frame type anodized silver/black anodized
Dimensions 2052 x 1052 mm
Absorption area 2,02 m2
Aperture area 2,05 m2
Glass thickness 3,2 mm
Glass type solar safety glass with anireflective coating
Connection dimension 22 mm
Inner tube 10 mm
Weight 38 kg
Type of absorber modrá vysokoselektívna vrstva Mirotherm
Optical efficiency 0,787
Minimum flow 60 l/h
Max. flow 300 l/h
Filing quantity 1,43 l
Max. operating pressure 10 bar
Max. operating temperature 189 ºC
 

Benefits of a solar collector Caliber 216

  • high year-round energy gain (selective absorption layer produced in a vacuum),
  • very good price/performance ratio, short time of temperature rise
  • possibility to connect up to 12 collectors in series,
  • connection between the collectors with a special bellows component eliminating radial and axial displacements at expansion,
  • fastening components made of stainless steel.
  • applicable to the production of heat and cool
  • immediately usable for high-flow and also low-flow systems
  • effective year-round use of a combination of solar system-water flow heater
  • lightweight thanks to the materials used and innovative technologies applied
  • simple time-saving assembly, fastening elements according to the shape of the roofing
  • connection of collectors using the bellows made of stainless steel without the use of bolted joints.
  • fastening components as accessory made of stainless steel.

Wide range of applications

  • applicable to the production of heat and cool
  • immediately usable for high-flow and also low-flow systems
  • effective year-round use of a combination of solar system-water flow heater
  • lightweight thanks to the materials used and innovative technologies applied
  • simple time-saving assembly, fastening elements according to the shape of the roofing
  • connection of collectors using the bellows made of stainless steel without the use of bolted joints.

EVACUATED TUBE COLLECTOR AUGUSTA SOLAR

heat-pipe collectorThe solar collectorcollector consists of glass vacuum tubes with an integrated "HEAT-PIPE" with a flat absorber. The absorber has a special highly selective surface that minimizes its heat losses by radiation. The "HEAT-PIPE" is filled with a medium and connected by a condenser to a heat exchanger. The absorber absorbs solar radiation which is then converted into heat. This heat is transmitted to the medium that evaporates, rises into a condenser where the heat potential is transmitted through the exchanger to a heat conducting medium flowing in the heat exchanger (Solar-Fluid) and then condenses.

scheme of heat-pipe collector

Benefits of a solar collector AUGUSTA

  • Simple installation of the collector allows pressurizing the entire system and connecting additional tubes at any time and directing the tube absorption layer in order to achieve the best gain of the solar collector which is beneficial even in the case of unfavourable roof orientation. The solar collector contains high-grade corrosion resistant materials.
  • smooth glass of the pipe prevents accumulation of dirt on the surface of the solar collector
  • high performance of the solar collector on a small area
  • the solar collector uses a diffuse solar radiation (radiation reflected from dust and air molecules)
  • borosilicate glass chemically and thermally stabilized, thousand time proven by use, resistant to hail and adverse weather conditions
  • high vacuum stability
  • elegant design of the solar collector
  • simple installation

The number of solar collectors depends on the consumption of water, purpose of use, roof orientation and roof pitch. In terms of optimum return on the solar system the design is based on the mutual proportion of needs and costs. In general, small solar assemblies are designed as:

  • High-flow (the flow through collectors is 50-100 l.h-1.m-2),
  • Low-flow (the flow through collectors is 10-20 l.h-1.m-2),

Effeciency of collectors

In the High-flow system water in the tank is heated slowly throughout the entire volume. The Low-flow system is used for thermal disinfection where it ensures rapid heating of the upper layer of the tank and is able to immediately deliver HW or heating water. When designing a system of solar collectors it is also important to properly determine the type and size of the piping - the difference between the pressure losses of seamless steel pipes and flexible stainless steel pipes (bellows) is high. Improperly sized piping and circulating pump may result in reducing the efficiency of solar collectors(increased pressure loss due to the increase in the density of antifreeze in the system at low-below zero temperatures, inadequate pump displacement, etc.). Therefore, we recommend the use of a circulating pump with electronic speed control. On the contrary, oversized piping results in higher operating costs of the circulating pump and increased heat loss in pipes.

  • The maximum amount of solar collectors connected in series is 5 pieces. In a larger number of solar collectors it is necessary to connect solar collectors in line. In this method of solar collectors’ connection, the connection according to Tichelmann is recommended.
  • The volume of the solar mixture in the system is a fixed value but it is dependent on the temperature. For this reason, it is necessary to take into account an expansion tank in the system the size of which depends on the content of media in the system. Consult the size of the expansion tank with the designer.
  • In order to avoid possible emergencies of solar collectors, we recommend installing a 6bar relief valve in the system.
  • For proper operation of the system it is important to pay attention to placing the temperature sensor into the sump at the output to the solar collector.
  • We recommend coating the temperature sensors with heat conducting paste which helps you achieve better heat transfer.
  • The installation of solar collectors should be carried out only after the installation of all necessary wiring and in poor availability of sunlight. In case of installation in the intense radiation we recommend covering the vacuum tubular solar collectors with a white cover (also if the solar system is installed but not filled with solar fluid).
  • Expansion of solar collectors must be eliminated by a swing arm, compensator or flexible connecting hoses.

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