Hewalex - Model KSR10 - Solar Collector
From Evacuated Tube Collectors
The KSR10 evacuated tube solar collectors (commonly referred to as vacuum solar collectors or tube solar collectors) are among the most efficient solar collectors in the market. The use of single-wall evacuated tubes, which are additionally covered with an anti-reflection coat, ensures high optical efficiency on the level of 85% in relation to the absorber's surface area. The evacuated tubes, made by the German expert company NARVA Lichtquellen GmbH + Co. KG, take advantage of patented innovative technical solutions.
The only solution of this type in the market is th...
The only solution of this type in the market is the KSR10 evacuated tube solar collector connection structure implemented by Hewalex. The housing of the connections is located at the bottom of the evacuated tubes which, in the case of stagnation, enables glycol to naturally flow out of the solar collector. This way, glycol is not overheated (boiled) for extended periods in the stagnation state and maintains its corrosion-protection and anti-freezing characteristics.
The unique characteristics of the solar collector ...
The unique characteristics of the solar collector are:
- Deep vacuum, 10-6 mbar (0.1 Pa), which eliminates convection heat losses from absorbers, compared to standard solutions offered in the market (usually the vacuum is equal to 10-3 do 10-5 mbar).
- Copper absorbers with a coat of Tinox titanium oxides, connected with copper pipes using the ultrasound welding method.
- Direct flow of the heating medium, which increases the efficiency by 4-6% compared to an analogous evacuated pipe designs with heat pipe type of flow.
- Patented glass-metal connection: a metal ring is melted into the glass, the copper pipe of the absorber goes through the flexible ring - in practice this constitutes a metal-metal connection.
- Maximum mechanical strength, which ensures resistance to pressure and steam impulses (cavitation),
confirmed in an additional test of 1,000 thermal shocks performed in accordance with the EN 12975 standard. - Low iron oxide content glass for the evacuated pipes and an additional anti-reflection (AR) coat which increases the transmission of solar radiation by approx. 5%.
- The use of a getter (gas absorber), based on barium compounds, which actively absorbs CO, CO2, N2, O2, H2, and H2O (residue gases from the production process).
- A getter (also used as a vacuum indicator) - if a tube is damaged and air gets inside, a chemical reaction takes place as a result of which white tarnish is deposited on the inner surface of the tube.
- Powder-coated housing of the collector's connections (ash-brown color, RAL 7022), an attractive design, a stable and strong structure.
- The evacuated tubes can be turned 25 degrees in order to correct bad position of the absorbers in relation to the direction of solar radiation.
- The collector can be installed without a required minimum and maximum inclination, which enables using it in non-standard buildings, to include vertically on a building's facade or horizontally on a flat roof.
Options regarding installation of the solar collector
Installation of the collector at an angle of 30-60 degree from the horizontal level is recommended. The KSR evacuated tube solar collector is one of the few collectors available in the market which do not have a mandatory minimum or maximum inclination angle.
Efficiency of the solar collector
The characteristics of the KSR10 solar collector were confirmed in tests conducted at the Institute for Solar Technology in Rapperswil, Switzerland. The 85% optical efficiency in relation to the absorber's surface area (or 78% in relation to the aperture) classifies the collector as one of the most efficient products in the European market for solar collectors. The optical efficiency and heat loss values given in the table refer to the surface area of the aperture (active). The KSR10 evacuated tube solar collectors achieve heat output that is even 50% higher compared to the popular evacuated tube collectors with double-wall evacuated tubes. This enables using smaller active surface areas compared to flat plate solar collectors or the aforementioned double-wall evacuated tube collectors.
Quality of the solar collector
The KSR10 evacuated tube solar collector has received the SOLAR KEYMARK certificate which certifies its quality in compliance with the PN-EN 12975 standard. The quality tests that the collector undergoes in accordance with this test assume at least 20 years of its service life.
Range of applications of evacuated tube solar collectors
The KSR10 evacuated tube solar collectors can be used in both small and large installations for hot domestic water production and for supporting heating systems in buildings. The high efficiency of the collectors enables achieving high operating temperatures of water, which can be used for process purposes.
Flat plate vs. Evacuated Tube Solar Collectors
In most cases, due to their lower costs, flat plate collectors are recommended as the cost of heat produced in such collectors is lower. A large percentage of evacuated tube collectors offered in the market have the double-wall evacuated tube design; as a result, their efficiency is comparable to or lower than the efficiency of flat plate collectors. In the case of the highly efficient KSR10 evacuated tube collectors, the price to efficiency ratio is one of the best in the market, which makes their use reasonable.
Parameters
- Length: 2130 mm
- Width: 856 mm
- Height: 116 mm
- Gross surface: 1.823 m²
- Aperture area: 1.014 m²
- Liquid capacity: 1.8 l
- Weight: 30 kg
- Optical efficiency: 78 %
- Heat loss coeff. A1: 1.27 W/(m²K)
- Heat loss coeff. A2: 0.0012 W/(m²K)
- Warranty: 5 years
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