SIZING OF SHELL AND TUBE HEAT EXCHANGER

U radu je provedeno dimenzioniranje unutrašnjosti izmjenjivača topline, tipa „shell and tube“, analitički. U prvom dijelu rada iznesene su osnovne smjernice o izmjenjivačima topline, kako bi se dobio uvid u način rada, vrste i primjenu izmjenjivača topline. Zatim je na osnovu ulaznih podataka napravljen termodinamički proračun unutrašnjosti izmjenjivača topline, koji će kasnije poslužiti za numeričku simulaciju. Izmjenjivač ima funkciju zagrijača vode, pa je radni medij u cijevima kao i na strani plašta, voda. Nadalje, u radu je opisan numerički pristup rješavanja, te je izrađen 3D model unutrašnjosti izmjenjivača topline. Na modelu je generirana geometrijska mreža, te su provedene numeričke simulacije u softverskom paketu Ansys Fluent 18.1. Iz rezultata simulacije, odnosno polja temperature može se zaključiti da je izvedba ovakvog izmjenjivača topline u praksi moguća, te bi on u cijelosti obavljao funkciju za koju je namijenjen.In this work the sizing of the core of "shell and tube" heat exchanger is performed, analitically. In the first part of the work the basic guidelines heat exchangers were presented, in order to gain insight into the mode of operation, the type and the application of the heat exchanger. Then, based on input data, a thermodynamic calculation of the heat transfer in the core of the heat exchanger was made, and the results are used in the numerical simulation. The heat exchanger is water heater, so the working medium is water inside of the tubes as well as on the side of the shell. Furthermore, the numerical approach to solving the problem is described and a 3D model of the exchanger's interior is created. The geometric grid is created in the CAD model and a mathematical model is solved numerically by using CFD software. Numerical simulation was performed in the Ansys Fluent 18.1 software package. From the simulation results, respectively, the temperature field it can be concluded that the performance of such heat exchanger is practicable and that it would fully perform the function for which it is intended