Electricity generation using wind turbines is an uprising technology with advancements happening on a daily basis. Electricity isgenerated by conversion of kinetic energy of the wind into mechanical energy of rotation of the blades. The blades are connected to a series ofpower transmission, lubrication, hydraulic and braking system components which get heated up when the wind turbine is in continuous operation.The wind turbine is equipped with sensors which trigger down the wind turbine power when these components are overheated. This in turn reducesthe power output given by the wind turbine. This paper involves the study of air flow and temperature distribution inside wind turbine nacelle andimprovement opportunities for cooling of components inside nacelle. 3D CFD simulation is carried out using OpenFoam software which is afreeware. Three cases are constructed in OpenFoam and comparative study is done to find out improvement opportunities for cooling of thecomponents.