This thesis addresses the problem of determining the thermodynamic properties of a mixture of humid hydrogen and water vapour, as well as the development of an algorithm for constructing appropriate thermodynamic diagrams used to determine the thermodynamic state properties of humid hydrogen. The analysis is based on the application of thermo-dynamic equations describing the state of a binary mixture consisting of an ideal gas (hydrogen) and water vapour. An algorithm for constructing the Mollier h$_{1+x}$ - x diagram for hydrogen was developed, and the corresponding diagrams were generated for different values of the total pressure of humid hydrogen. The resulting diagrams were subsequently used to describe and analyse various thermodynamic processes involving humid hydrogen, such as heating, cooling, conden-sation, and similar processes. The developed diagrams and algorithm therefore provide a practical engineering tool for the design and development of hydrogen technology systems.
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