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Power Electronics

Two-Phase Evaporative System Cools 1MW+ Converter Systems for Wind Turbines

Parker Hannifin Corporation, announced precision cooling units for wind turbines, utilizing two-phase evaporative cooling technology for large and offshore wind turbines. The 50kW configuration unit with cooling capacities of 18 kW to 200kW, for wind turbines ranging from 1.5-8.0 MW. Parker's Precision Cooling Systems has adapted its long-established patented evaporative cooling technology into a system that efficiently cools critical wind turbine power generation systems, with higher efficiency, safety and power density, compared to water cooling.

The flexibility of Parker's technology has made it easy to package it into a new drop-in cooling system solution which can be located down tower adjacent to the converter or outside the tower. Additionally, converter manufacturers can quickly adopt two-phase evaporative cooling because existing water-cooled cold plate assemblies can be replaced without any new mechanical design layout.

The Parker system's inherent cooling efficiency benefits result in total system cost reductions of up to 15%, and/or enable up to a 33% increase in converter rated capacity using the same architecture. Adopting the Parker two-phase evaporative cooling system, (available in capacities of 18kW, 50kW, 100kW and 200 kW) allows converter OEMs to significantly leverage existing assets, by being able to retrofit, and in fact, upgrade existing wind turbines to improve reliability and reduce power module replacement cost. This is accomplished because the IGBTs operate at a more reliable, lower temperature year round. No matter where the wind turbine OEM is in the development cycle, the scalable design of Parker's "drop in" two-phase evaporative cooling system makes it integrate with ease into new or existing wind turbine designs.

The dual-phase liquid cooling process uses a refrigerant to circulate within a sealed, closed-loop system to cool a wide range of wind turbine systems, including the generator, reactor, transformer and the converter. The Parker system uses a small pump to deliver just enough coolant to the evaporator - usually a series sealed cold plates optimized to acquire the heat from the device(s). In so doing, the coolant begins to vaporize maintaining a cool uniform temperature on the surface of the device being cooled. In its evaporated state, the coolant then flows through a heat exchanger where it rejects the heat to the ambient and condenses back into a liquid, completing the cycle.

Parker Hannifin Corporation
Part Number: Two-Phase

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