Wind turbine generator with heat exchanger

The present invention relates to a wind turbine generator with a heat-generating source, e.g. a generator or a gearbox. A primary and a secondary cooling circuit, arranged for circulating a first and a second fluid, respectively between the heat-generating source and a heat exchanger, and a cooling reservoir and the heat exchanger, respectively. The heat exchanger comprises a plurality of pipes for conveying the second fluid from the secondary cooling circuit through the heat exchanger, the plurality of substantially parallel pipes being arranged for heat exchange with a flow of the first fluid from the primary cooling circuit. The secondary cooling circuit further comprises a dispersion chamber connected to the plurality of pipes, the dispersion chamber having a fluid intake being positioned sideways relative to the plurality of pipes so as to provide, at least partly, a levelling of the flow distribution across the plurality of pipes of the second fluid prior to heat exchange. The invention provides an impr