Wind Turbine Converter Cooling

The liquid-to-air cooler is the heart of the converter cooling loop. Warm water-glycol from the converter flows through finned tubes while fans push ambient air across the coil. ICARUS sizes the coil for the converter heat load, the coolant flow and the maximum coolant inlet temperature that the converter supplier allows, at the highest ambient temperature on site. We optimize tube rows, fin pitch and circuiting for a low pressure drop on both sides, so the pump and fans use as little auxiliary power as possible. The same finned tube technology is used in our dry coolers for industry and offshore.

Not all heat leaves through the cold plates. Capacitors, chokes, busbars and control electronics warm up the air inside the converter cabinet. A compact air-to-liquid coil inside the cabinet, connected to the same water-glycol circuit, removes that heat without opening the cabinet to nacelle air. For turbines without a liquid circuit, an air-to-air heat exchanger keeps the cabinet sealed while still using outside air for cooling. Both concepts protect the electronics against dust, moisture and salt.

Depending on the turbine platform, the converter sits in the nacelle or at the bottom of the tower, and the cooler follows it. Roof-mounted coolers often share the air stream and the fans with the generator cooler circuit, next to the nacelle heat exchanger. Tower base converters typically use a cooler mounted on the tower wall or next to the foundation. ICARUS builds both, with custom dimensions, connection positions and mounting frames, so the cooler fits the existing interfaces of your turbine.

Converter coolers lose capacity slowly and quietly. Dust, pollen, cottonwood seeds and insects clog the fins on onshore sites, while salt mist attacks aluminum fins offshore. Once the air side is blocked or corroded, the coolant runs hotter and the converter starts to derate on warm days. ICARUS reduces this risk with wider fin spacing where fouling is expected, cleanable coil designs and materials matched to the site: copper/aluminum, copper/copper, coated aluminum or stainless steel AISI 316. For coastal and offshore turbines we apply the same approach as our high corrosion environment heat exchangers.

Across the United States, thousands of turbines are approaching 15 to 20 years of operation, and owners are choosing life extension and targeted upgrades over full replacement. A corroded or undersized converter cooler is one of the most cost-effective upgrades: it removes derating on hot days and prevents costly power module failures. ICARUS reverse engineers the existing cooler from drawings, photos or measurements and builds a replacement that drops into the same position and connections, often with more capacity and better corrosion resistance than the original. We deliver single units for repairs as well as series for complete fleets.