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Solar Panel Copper Tubes for Solar Thermal & Renewable Energy Systems
Product Overview
Solar panel copper tubes are engineered for high thermal conductivity, corrosion resistance, and long-term reliability in solar thermal and renewable energy systems. Manufactured using premium Copper DHP (Deoxidized High Phosphorus) grade, these tubes ensure superior heat transfer efficiency, making them ideal for solar water heaters, flat-plate collectors, heat exchangers, and solar vacuum tube systems. Their excellent mechanical strength, ease of fabrication, and resistance to high temperatures provide consistent performance in both residential and industrial solar installations. R V Metal Corporation supplies solar copper tubes in straight lengths and coils with precise dimensional accuracy, delivering dependable performance in demanding solar heating applications.
Technical Specifications
| Parameter | Specification |
|---|---|
| Material Grade | Copper DHP (Cu-DHP) – CW024A / C12200 |
| Copper Purity | ≥ 99.90% (Deoxidized, Residual Phosphorus 0.015–0.040%) |
| Thermal Conductivity | 320–340 W/m·K |
| Temper | Soft Annealed (O60) / Hard Drawn (H58) |
| Outside Diameter Range | 6 mm to 28 mm (Custom sizes available) |
| Wall Thickness Range | 0.40 mm to 1.50 mm |
| Manufacturing Standard | EN 12449 / EN 1057 / ASTM B111 / ASTM B280 |
| Working Temperature | -40°C to +250°C |
| Surface Finish | Bright, Clean, Degreased – Moisture-Free for Solar Applications |
| Form of Supply | Straight Lengths (3m / 5.8m) and Pancake Coils (15m / 30m / 50m) |
| Leak Testing | 100% Eddy Current Tested |
| Applications | Solar Water Heaters, Solar Flat Plate Collectors, Heat Exchangers |
Chemical Composition
| Element | Symbol | Percentage (%) | Description |
|---|---|---|---|
| Copper | Cu | ≥ 99.90% | Base metal ensuring excellent thermal conductivity. |
| Phosphorus | P | 0.015 – 0.040% | Deoxidizing agent to improve weldability and corrosion resistance. |
| Other Impurities | — | ≤ 0.05% | Strictly controlled to maintain solar-grade performance. |
| Total Alloying Elements | — | ≤ 0.10% | Ensures purity required for solar thermal efficiency. |
UNS Codes & Grades
| Material Grade | UNS Code | EN / ISO Designation | Common Name | Application Relevance |
|---|---|---|---|---|
| Copper DHP | C12200 | CW024A (EN 1057 / EN 12449) | Deoxidized High Phosphorus Copper | Preferred for solar thermal collectors due to excellent heat transfer & brazability. |
| Copper Phosphorus-Deoxidized (High Residual P) | C12000 | CW023A | DLP Copper | Used for select solar heating tubes requiring stable mechanical properties. |
| Electrolytic Tough Pitch Copper | C11000 | Cu-ETP / CW004A | ETP Copper | Used in electrical components within solar systems; not preferred for brazing zones. |
Mechanical, Physical & Fabrication Properties
| Property Category | Copper DHP (C12200) | Copper DLP (C12000) | Copper ETP (C11000) | Relevance for Solar Applications |
|---|---|---|---|---|
| Tensile Strength (MPa) | 220 – 260 | 230 – 270 | 240 – 300 | Ensures structural integrity under pressure and outdoor conditions. |
| Yield Strength (MPa) | 60 – 90 | 70 – 100 | 70 – 120 | Affects durability during system expansion & contraction. |
| Elongation (%) | ≥ 40% | ≥ 35% | ≥ 30% | Higher ductility improves bendability during installation. |
| Thermal Conductivity (W/m·K) | ≈ 330 | ≈ 330 | ≈ 390 | Critical for efficient heat absorption in solar collectors. |
| Electrical Conductivity (% IACS) | 85 – 90% | 85 – 90% | 100% | Relevant only for electrical solar components; not for panels. |
| Melting Point (°C) | 1083°C | 1083°C | 1083°C | Handles high stagnation temperatures in evacuated tube systems. |
| Brazability | Excellent | Very Good | Poor (due to oxygen content) | Brazing is essential for leak-proof solar heat-transfer circuits. |
| Formability | Excellent | Excellent | Good | Allows bending for panel manifolds and coil configurations. |
| Corrosion Resistance | Excellent | Very Good | Good | Ensures long service life in outdoor & humidity-exposed installations. |
| Weldability | Good | Good | Poor | Most joints are brazed; oxygen-free grades are not required. |
Common Names & International Identifiers
| Copper Grade | Common Names | International Identifiers | Notes for Solar Applications |
|---|---|---|---|
| Copper DHP (C12200) |
Deoxidized High Phosphorus Copper Medical Gas Copper Solar Grade Copper Tube Plumbing & HVAC Copper Tube |
UNS C12200 ASTM B68 / B75 / B251 EN CW024A ISO Solar Copper Tube Grade |
Most widely used copper grade for solar thermal collectors due to excellent brazability and corrosion resistance. |
| Copper DLP (C12000) |
Deoxidized Low Phosphorus Copper General Engineering Copper Conductive Copper Tube |
UNS C12000 ASTM B68 / B75 EN CW023A |
Suitable for certain solar applications but less preferred than DHP due to lower hydrogen embrittlement resistance. |
| Copper ETP (C11000) |
Electrolytic Tough Pitch Copper High Conductivity Copper Pure Copper Tube |
UNS C11000 ASTM B68 / B188 EN CW004A ISO HC Copper |
Not recommended for brazed solar systems; oxygen content makes it vulnerable to embrittlement during high-temperature brazing. |
Standards & International Equivalents
| Standard / Specification | Region / Authority | Applicable Copper Grades | Relevance for Solar Panel Copper Tubes |
|---|---|---|---|
| ASTM B75 | USA | C12200 (DHP), C12000 (DLP), C11000 (ETP) | Defines seamless copper tube requirements widely used in solar thermal systems. |
| ASTM B68 | USA | C12200, C12000 | Specifies drawn, seamless copper tubes ideal for heat transfer applications like solar collectors. |
| ASTM B251 | USA | C12200 | Standard for general-purpose copper tubes used in solar heating coils and manifolds. |
| EN 12735-1 | Europe (EU) | CW024A (DHP) | European standard for copper tubes used in refrigeration and heat-exchanger systems including solar heaters. |
| EN 1057 | Europe (EU) | CW024A | Defines seamless round copper tubes for water and heating systems; widely used in solar thermal circuits. |
| ISO 1635 / ISO Solar Standards | International | C12200 (DHP) | Specifies copper tube requirements for solar heating collectors and thermal systems. |
| JIS H3300 | Japan | C1220 (DHP) | Japanese standard for seamless copper tubes used in solar water heaters and heat exchangers. |
| BS EN 12449 | UK / EU | CW024A | Standard for copper and copper alloy tubes used in heat exchangers and solar heating coils. |
| DIN 1786 / DIN 1412-2 | Germany | DHP Copper | Defines precision copper tubes widely used in European solar heating systems. |
Applications
| Application Area | Description | Why Copper DHP is Preferred |
|---|---|---|
| Solar Thermal Collectors | Used in absorber plates, header pipes, and riser tubes in flat-plate and evacuated tube collectors. | High thermal conductivity, excellent corrosion resistance, strong weldability. |
| Solar Water Heating Systems | Primary tubing for circulation of heated water in domestic and commercial solar heaters. | Uniform heat transfer, long service life, and safe for potable water applications. |
| Heat Exchanger Coils | Copper tubes serve as coil circuits for transferring heat between solar collectors and storage tanks. | Superior heat-transfer efficiency and consistent performance under cyclic temperature loads. |
| Solar Thermal Power Plants | Used in heat-transfer loops and condenser systems in CSP (Concentrated Solar Power) units. | Handles high temperature and pressure with excellent reliability. |
| Glycol-Based Solar Fluid Circuits | Used in closed-loop systems circulating antifreeze solutions for all-weather solar heating. | High corrosion resistance against glycol mixtures and elevated-temperature fluids. |
| Solar Rooftop Heating Grids | Grid-style copper tube networks for large-scale solar heating installations. | Easy to bend, fabricate, and install while maintaining pressure integrity. |
| Solar Absorber Fins (Finned Tubes) | Copper finned tubes enhance heat capture efficiency in thermal panels. | High surface-area heat exchange and excellent fin-to-tube bonding. |
| Solar Pool Heating Systems | Used in heat exchanger tubes that transfer thermal energy to swimming pool water. | Corrosion resistance to chlorinated water and long-term durability. |
| Hybrid Solar Heating Systems | Integrated copper tube loops for systems combining solar + electrical or solar + gas heating. | Stable performance under mixed-use heating operations. |
Standard Copper Tube Dimensional Chart
| Outside Diameter (mm) | Wall Thickness (mm) | Inside Diameter (mm) | Theoretical Weight (kg/m) | Typical Application |
|---|---|---|---|---|
| 8 mm | 0.70 | 6.6 | 0.118 | Solar riser tubes, small absorbers |
| 10 mm | 0.70 | 8.6 | 0.147 | Riser tubes, interconnecting lines |
| 12 mm | 0.70 | 10.6 | 0.177 | Solar circulating coils |
| 12 mm | 1.00 | 10.0 | 0.244 | High-pressure solar heating loops |
| 15 mm | 0.70 | 13.6 | 0.220 | Collector risers & headers |
| 15 mm | 1.00 | 13.0 | 0.308 | Closed-loop solar heating systems |
| 18 mm | 1.00 | 16.0 | 0.390 | Solar headers & manifold tubes |
| 22 mm | 0.90 | 20.2 | 0.435 | Main headers for solar panels |
| 22 mm | 1.20 | 19.6 | 0.564 | High pressure solar heat circuits |
| 28 mm | 0.90 | 26.2 | 0.554 | Solar hot water main lines |
| 28 mm | 1.20 | 25.6 | 0.720 | Large header pipes |
| 35 mm | 1.20 | 32.6 | 0.902 | Central manifold tubes |
| 42 mm | 1.20 | 39.6 | 1.086 | Solar storage heat exchangers |
| 54 mm | 1.20 | 51.6 | 1.408 | Large system headers & return lines |
| 67 mm | 1.20 | 64.6 | 1.743 | Solar thermal plant pipelines |
| 76.1 mm | 1.50 | 73.1 | 2.451 | Commercial solar hot-water systems |
| 108 mm | 1.50 | 105.0 | 3.460 | Solar industrial heat exchangers |
