Microchannel vs Finned-Tube Coils in Coastal Sites
Microchannel vs finned tube (cu-al)
| Microchannel | Finned tube (Cu-Al) | |
|---|---|---|
| Metals | All aluminium, brazed. | Copper tubes, aluminium fins. |
| Typical coastal failure | Pitting through thin tube walls; refrigerant leaks. | Fin collars corrode and loosen; capacity falls. |
| Repairability | Leaks are difficult to repair; coil replaced. | Leaks in tubes and bends can often be brazed. |
| Coating | Thin film by dip to keep louvers open. | Dip or spray; must cover collars and joints. |
| Refrigerant charge and weight | Lower charge, lighter coil. | Higher charge, heavier coil. |
Choose microchannel if…
- The unit design uses microchannel and it can be coated before shipment
- Low refrigerant charge and weight matter
- Coating by dip is available for the coil size
Choose finned tube (cu-al) if…
- Field repairability is important at a remote site
- The coil will be coated or recoated by spray
- The manufacturer offers a finned-tube option for coastal projects
Cost and lead time
Most unit manufacturers offer one coil type per model, so the choice is often made when the unit is selected. Where both are available, compare them with coating included: microchannel coils need dipping before assembly, and a coated finned-tube coil may cost more in refrigerant and weight but is easier to repair on site.
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