Numerical simulation of secondary heat exchanger in S-Allegro

This paper presents a computational analysis of the Secondary Heat Exchanger (SHX) in the S-Allegro experimental facility. The S-Allegro facility is a helium circuit which serves as an experimental platform for validating thermohydraulic calculations of helium flow in support of Gascooled Fast Reactor (GFR) development. A computational analysis performed on the SHX included calculations using criterial equations of heat transfer and, most importantly, numerical simulation. Both methods were compared to experimental data and adjusted to achieve a good agreement. The results of the numerical simulations are used to analyse flows in the heat exchanger and identify potential improvements in future design of heat exchangers for GFR. The study provides insights into the thermal performance of helium-water heat exchangers and contributes to the validation of computational methods for GFR technology development.