What is the typical weight savings for tube materials when using economical, eco-friendly copper tubes?
In one design study for functionally equivalent 5-kW HVAC heat exchangers, the weight of the tube materials in the coils was 3.09 kg, 2.12 kg and 1.67 kg for tube diameters of 9.52 mm, 7 mm and 5 mm, respectively. The tube weight was reduced by 31 percent and 46 percent when copper tube diameters were downsized from 3/8 inch to 7 mm and from 3/8 inch to 5 mm, respectively.