Philip Groesdonk enhanced building energy modeling capabilities in the RWTH-EBC/AixLib and TEASER repositories by developing features for radiative heat exchange and interzonal heat flow. He re-enabled radiative heat exchange modeling between indoor surfaces in Modelica, ensuring more accurate thermal zone simulations. Philip also implemented adjacent zone connections in OpenModelica, refining parameter definitions to improve interzonal heat transfer handling. In TEASER, he updated example scripts and streamlined data loading for construction elements, increasing configurability and alignment with ongoing development. His work combined Modelica and Python, demonstrating depth in building physics, code refactoring, and thermal modeling while reducing code maintenance overhead.