This thesis work deals with the study of the formation and growth of ice on the Pressure Control Assembly (PCA), a pressure control valve that will be installed on board the I-HAB module of the future Lunar Gateway mission. The lunar space station, which will constitute a huge step forward towards interplanetary exploration, has its roots in the International Space Station, and therefore the study of the latter's Environmental Control and Life Support Systems (ECLSS) is fundamental, in order to understand the technological evolution and to prevent critical issues encountered in the past. After an analysis of the methodologies present in the literature to establish a valid ice formation model and using the Ansys Fluent software, we will proceed with the analysis of the geometry of the PCA and the parametric study of the mesh associated with it.