Resource Library

Are small diameter tubes necessary for increasing the energy efficiency of air conditioners?

No. The system energy efficiency can also be achieved with conventional tubes (such as 3/8 inch diameter tubes) simply by using more tubes and thereby increasing the surface area available for heat transfer. Nevertheless, a penalty is paid in terms of the increased weight of tube material and fin material as well as increased refrigerant volume. In general, if larger diameter tubes are used then a larger coil size is necessary to achieve the same performance and energy efficiency that could be achieved in a more compact system with smaller diameter tubes.

Pub 098 - Joining of Copper and Copper Alloys

Suitability of the many methods now available for the jointing of copper and copper alloys with details of filler materials and recommendations for good joining practice. 1994. 64pp.

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Pub 103 - Hot Stampings in Copper Alloys

A description of the hot stamping process with advice on design and detailed data on the most commonly used alloys. 1994. 20pp.

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Are the 1, 2 and 5 Cent Euro coins pure copper?

No, they are made from steel coated with a thin layer of copper.

Pub 104 - Copper-Beryllium Health and Safety Notes

Guidance notes for users of copper beryllium products. 1994. 2pp

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Pub 106 - Corrosion Resistance of Copper and Copper Alloys

This large table gives information on the suitability of copper and copper alloys with many different chemicals. Data is given for copper, brass, copper-nickel, aluminium bronze and gunmetals at three temperatures and shows if specific materials can be used with chemicals giving an indication of corrosion resistance. 5pp.

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Are hygienic copper surfaces coated?

No, the hygienic property of copper is intrinsic to the metal.  In order to maintain this benefit, oils, waxes, glosses, paints and other coatings must NOT be applied.

Pub 115 - Aluminium Bronze with Cast Stainless Steels and Ni-resist in Offshore Seawater Environments

This report has collated data comparing the physical, mechanical and fabrication properties of cast nickel aluminium bronze (NAB), in particular NES 747 Part 2, with cast standard and super austenitic and duplex stainless steels and Ni-Resist for use in offshore sea water applications. 1996. 22pp.

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Pub 116 - Electrical Energy Efficiency

Both financial appraisal and technical consideration of electrical energy efficiency of motors, cables, busbars and transformers, with actual case histories showing savings to be made, can be found in this book. 1997. 120pp.

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An engineering report suggests that Stress Corrosion Cracking (SCC) is a problem in brass tubes. What steps may be taken to avoid SCC?

SCC occurs due to the combined effect of stress and corrosion. The stress may be removed by a stress relief anneal at 250 to 300° C for ½ to 1 hour.

Pub 118 - 90/10 Copper-nickel

A four page leaflet highlighting the unique properties of the copper-nickel alloys when used in seawater environments. 1997. 10pp.

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