Heat Sinks for Air Conditioner Inverter Modules

Requirement

The customer’s inverter air conditioners mount the inverter module in the outdoor unit, where the sink is exposed to rain and humid heat. Space inside the unit is limited so the sink cannot reach the fan, annual volume is high so cost must stay low, and the finish must not show visible anodizing shade drift.

Our approach

We replaced skiving with extrusion, choosing fin height from the internal clear height and cutting length to module width. Anodizing plus sealing improves corrosion resistance in humid conditions; fins face outward with wider pitch so rain carries dust away; one bath per batch controls shade.

Delivery and inspection

Monthly shipments by model with a colour sample for comparison; sampled on fin height, length and appearance.

Project summary

No visible corrosion or shade drift under rain and humid heat, build height met the structure limit, and extrusion lowered unit cost. Three outdoor unit models now use it.