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- Calpak vacuum tube collector with flat reflector
Calpak vacuum tube collector with flat reflector
Calpak vacuum tube collector with flat reflector
Vacuum tube collectors with flat reflectors are designed for higher efficiency in diffuse radiation conditions, such as cloudy weather and winter. The vacuum between the glass tubes acts as an excellent insulator, preventing freezing at temperatures as low as -18°C. The Calpak Vacuum VT models are available with 12 or 20 vacuum tubes, each 1.5 meters in length, and are designed to be space-efficient and easily replaceable. The flat corrugated reflector is made of granulated aluminum, which enhances performance by allowing dust and snow to slide off easily.
The construction includes an outer and inner glass, an aluminum fin, a copper tube in U-form, and a vacuum. The layout for the 20VT model is specifically highlighted.
The instantaneous efficiency curve for the Calpak 20VT collectors is provided, adhering to ISO 9806-1 and EN 12975-2 standards.
- Dimensions: The 12 VT model measures 1600 x 900 x 100 mm, while the 20VT model measures 1600 x 1410 x 100 mm.
- Weight: 36 kg for 12 VT and 58 kg for 20VT.
- Aperture Area: 1.26 m² for 12 VT and 2.10 m² for 20VT.
- Glass Cover: Borosilicate glass 3.3 with an external diameter of 47 mm and length of 1500 mm.
- Vacuum Pressure: Less than 0.005 Pa.
- Absorber Material: Inner copper U-pipes with a diameter of 9.52 mm and thickness of 0.65 mm, and inner aluminum with a thickness of 0.8 mm.
- Surface Treatment: Sputtered selective with an absorption coefficient greater than 0.93 and an emission coefficient less than 0.06.
- Heat Transfer Medium: Closed circuit glycol brine.
- Insulation: 30 mm thermal insulation of header made from expanded polyurethane and fiberglass.
- Casing Material: Aluminum.
- Connections Diameter: 22 mm.
- Maximum operating temperature: 220°C.
- Maximum operating pressure: 10 bar, tested at 15 bar.
- Output for Germany (Würzburg): 647 kWh/m²/year.
The product is certified under EN 12975-2, ISO 9806-1, and Solar Keymark standards.
Catalog excerpts
Vacuum tube collector with flat reflector Vacuum tube collectors have higher efficiency in diffuse radiation (cloudy weather and winter), compared to flat plate collectors. The vacuum produced between the two glass tubes is a perfect insulating material which protects the collector from freezing when temperatures are even -18 °C. Our Calpak Vacuum VT are produced with 12 or 20 vacuum tubes of 1,5 m length. They are placed very close next to each other in order to minimize space. They can be exchanged separately. The flat corrugated reflector is made of granulated aluminium, which gives better results when dust or dirt are gathered on its surface, and snow can slip down easier.
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