To keep up with today's new technologies & work environment, engineers & researchers have to use their time and work in an efficient way. To achieve results in a quick fashion, use of engineering simulation programs & software is getting more and more important everyday. In the energy industrial sector, engineers face similar challenges. Complex calculations for thermodynamics, heat transfer, fluid mechanics applications lead engineers & researchers to use up-to-date simulation and modeling tools. One of them is Simulation Software IPSEpro which is used in this master's thesis. The subject of this master's thesis is the development of a steam generator simulation model in terms of convection and radiation calculations. It comprises of six chapters. The first chapter gives an overview of steam generators, introduces a water-tube boiler concept, a summary of available simulation software in the market. In the second chapter, Simulation Software IPSEpro is defined. Its Model Development Kit and Process Simulation Environment are mentioned; some significant points such as model-connections, systems analysis, numerical simulation methods are described. The third chapter consists of two sections. In the first section, considerable theoretical approaches and formulas are given. To complement this, the second section introduces models developed in this work, the practical side and visual diagrams of sub-models. The fourth chapter enlightens the reader about the structure of the developed model, the path that should be followed for the convergence method, the features used within the simulation software IPSEpro and the parameters considered for the simulated process. The fifth chapter presents the test results of an entire steam generator process and a duct with different bundles. The influence of coatings for exterior walls and tube types on system, is evaluated. Regarding steam generator process, simulation results are shown and validated with a practical example. The sixth chapter is the conclusions section. The aim of this master's thesis is briefly mentioned, literature survey is given. Advices and recommendations are given to engineers or researchers who want to study this subject further.