Condenser and evaporator coils with round copper tubes and aluminum fin have been a winning combination in the HVAC industry for many years. Manufacturers appreciate the assembly advantages provided by these components, and technicians find it easy to join and repair copper tubing in the field. More importantly, this well established technology has a proven record of durability and a high level of customer satisfaction. Demands for lower costing, energy efficient, environmentally friendly alternatives have moved the copper tube industry toward tubing that is smaller in diameter. The advantages of smaller tubes include higher heat transfer, less refrigerant and smaller unit size.
Demands for reduced raw materials costs and the use of environmentally friendlier refrigerants have been the impetus for heat exchanger designs that are based on smaller diameter copper tubes. Reducing the tube diameter achieves weight and material cost reductions, increases compatibility with new refrigerants, and increases energy efficiency, all without compromising quality. In addition, the advantages of using copper — familiar manufacturing processes, recyclability, sustainability, durability and corrosion resistance — are maintained. Energy efficiency and reduced overall system size can be achieved at a lower material cost with smaller diameter tubes. Smaller tubes result in reduced usage of tube materials, fin materials and refrigerants, contributing to overall reduction in system cost.