MATHEMATICAL MODEL OF A HEAT EXCHANGER WORKING WITH DIFFERENT REFRIGERANT FLUIDS 
MATHEMATICAL MODEL OF A HEAT EXCHANGER WORKING WITH DIFFERENT REFRIGERANT FLUIDS Ion Zabet^{1*}, Iulian Niţă^{1}, Raluca Fako^{1}, Graţiela Maria Ţârlea^{2}
^{1}Center of Technology and Engineering for Nuclear Project, 409, Atomistilor Street, Magurele, Ilfov, Romania ^{2}Technical University of Civil Engineering Bucharest, 66 Blv. Pache Protopopescu, Bucharest, 021414, Romania ABSTRACT This paper involves building a model of a finandtube heat exchanger geometry using EES software, creating a suitable geometry, setting up the cases (choosing solvers, numerical solution methods, etc.), making the calculations, and comparing results to known experimental data. The mathematical model can find a suitable heat exchanger to recover more Hydrogen with less quantity of Helium. Experiments done on finandtube heat exchangers and reported in the literature are used for validation. The heat exchangers equipment used (for the validation of the model) were described in manufacturer product catalogue. The difference between calculated and manufacturer was ±4%. The model was validated in other applications. The model is working on the primary side with thermal fluids such as: R152a, R404A, R407C, R410A, R507A, R744, He and on the secondary side with gases such as: Air, H, T on the other side.
