• Collector Dimensions: Length: 1600 mm, Width: 1330-1770 mm, Height: 100 mm
• Weight: 35-45.5 kg
• Aperture Area: 1.96-2.61 m²
• Number of Vacuum Tubes: 12-16
• Glass Cover Tube: External Diameter: 47 mm, Length: 1500 mm
• Pressure Tested: 1.3 Mpa
• Material: Borosilicate Glass 3.3
• Vacuum Pressure: < 0.005 Pa

• Inner Copper U-pipes: Diameter: 9.52 mm, Thickness: 0.65 mm
• Inner Aluminum Fin: Thickness: 0.8 mm
• Surface Treatment: Selective Sputtered
• Absorption Coefficient: >0.92
• Emission Coefficient: <0.08

• Thermal Insulation Thickness: 30 mm
• Header Insulation: Expanded Polyurethane and Fiberglass
• Frame: Black Anodized Aluminum
• Reflector: High-reflection Aluminum (CPC-Type)

• Maximum Temperature: 220°C
• Maximum Operating Pressure: 10 bar
• Efficiency (ENEA): η0 = 0.665
• Thermal Loss Factor (ITW): a1 = 0.7

The Calpak VTN Vacuum Tube Collector is a highly efficient solar collector designed for maximum energy yield, even under diffused radiation conditions. It features a parabolic reflector and is built for durability and high performance in less favorable weather conditions. The collector is equipped with unique Copper U-Pipes and thick aluminum fins for enhanced thermal capacity and energy extraction. The product is environmentally friendly, using water-blown PU insulation without CFCs.

The VTN collectors are available in configurations with 6, 8, or 10 tubes. Calpak-Cicero Hellas S.A. is based in Athens, Greece, and is ISO 9001:2008 certified.