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Copper tubes for solar energy and heating appliances-CONTINENTAL STEEL CO.,LTD
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Copper tubes for solar energy and heating appliances

Jun 23, 2025

Copper tubing plays a key role in both traditional and modern heating solutions, as well as solar energy systems. Its exceptional corrosion resistance and non-rusting nature make it particularly valuable in steam-heating systems, especially in return lines, where it ensures reliable operation and minimizes maintenance for components like traps and valves.

 

One innovative yet time-tested application is radiant panel heating, which can be effectively used in almost any building type. In this system, low-temperature hot water circulates through copper tubes embedded in concrete floors or plaster ceilings. The result is a gentle, even distribution of heat that warms both surfaces and air, offering silent operation, consistent comfort, full floor usage, and a dust-free environment—ideal for modern living spaces.

 

Listed below are the physical properties and chemical requirements of the copper tubes for heating applications.

 

Physical Properties:

Temper

Tensile strength Kg/mm2 Min.

Elongation % on 5.65 A Min.

Annealed

21.5

33

As Manufactured

23.5

13

 

Chemical Requirements:

Copper (Incl. Silver)

99.85% Min.

Phosphorus

0.013 to 0.05%

Total Impurities

0.06% Max.

 

With the increasing global emphasis on energy efficiency and sustainable building, copper has become a preferred material in solar thermal heating and cooling systems. These systems, used for both space heating and domestic water heating, typically involve integrating a solar collector into the home's plumbing system—often mounted on the roof to capture solar energy effectively.

 

Copper is especially suited for solar applications due to several key properties:

Superior thermal conductivity among all engineering metals, enabling efficient energy transfer.

High resistance to corrosion in both atmospheric and water-based environments.

Ease of fabrication and joining, allowing for straightforward installation using soldering or brazing techniques.

Proven track record in plumbing and roofing for centuries, demonstrating long-term durability.

 

In solar collectors, copper’s excellent heat conduction allows for the use of thinner sheets compared to aluminum or steel, and its collector tubes can be spaced farther apart without compromising efficiency. Its atmospheric corrosion resistance is proven by its performance in roofing, where it can last decades or even centuries unless exposed to high levels of industrial pollutants. Similarly, copper handles hot water corrosion effectively when system flow rates and sizing follow proper standards.

 

Moreover, the simplicity of joining copper pipes and fabricating copper sheet materials contributes to its practicality and long-standing popularity in heating and solar applications.

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