Space qualification test infrastructures are crucial to ensure that systems destined for space can operate under extreme conditions. However, test environments are often complex to manage, expensive to maintain and inflexible, especially when there is a need to introduce modifications or optimizations. This paper therefore proposes an initial step towards the creation of a Digital Twin of a specific test infrastructure: the CIRA Vacuum Thermal Chamber. In particular, the aim of the thesis concerns the development of a digital model of the chamber as a faithful replica of the physical system. In this way, it is possible to conduct simulations that can be exploited in the long term for the creation of a complete Digital Twin that could provide real-time monitoring of the test, conduct predictive analyses and optimize testing processes.