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    NUMERICAL INVESTIGATION ON THE COOLING OF HAWT NACELLA
    (2022-10) Al-Kaabi, Abdulkhaleq Salman Mwaea
    Wind turbines have to keep running even when the weather is bad and the temperatures fluctuate throughout the day and the year. Most noticeably, the nacelle's electrical and electronic components could be subjected to extreme temperature changes, which could cause strains in the design that are inconsistent with the intended operation of the components. A manageable temperature inside the nacelle can be maintained by rejecting to the atmosphere the heat produced by the electrical and mechanical components as a result of various power dissipations (due to the Joule effect, friction losses released (generator, gearbox)). This is accomplished by regulating the heat exchange between the nacelle's internal air and the air outside. In this study, a liquid cooling system and forced air Colling system were used to cool the mechanical and electrical equipment. The effectiveness of cooling was evaluated by a comparison utilizing the simulation program. The Reynolds-averaged Navier-Stokes equations describe the flow of air into and out of the nacelle, as well as the flow of liquid in and out. Heat transmission has been factored in using the energy equation. The Result includes the temperature for the gearbox and generator by used a liquid and air forced cooling system. The results of the simulations showed that liquid cooling is superior to forced air cooling. Specifically, the significance of designing and implementing an effective cooling system for nacelle temperature control is given and explored.