CONSTRUCTION OF A SHELL AND TUBE HEAT EXCHANGER IN A GEOTHERMAL POWER PLANT

Tema ovog rada je termodinamički proračun izmjenjivača topline te provjera i dokazivanje da li je odabrani izmjenjivač topline moguć u odabranoj konfiguraciji, te provjera i dokazivanje dali dolazi do temperaturnog križanja, te ako dolazi, odrediti u kojoj količini i odabrati rješenje za smanjivanje tj. za eliminiranje pojave temperaturnog križanja. U uvodnom dijelu objašnjeni su glavni pojmovi izmjenjivača topline, rekuperativnog tipa, izvedbe cijev u plaštu (Shell and Tube), navode se podjele, primjene izmjenjivača kao i princip i način rada. Potom su prikazane i objašnjene sve relacije koje se koriste u praktičnom dijelu rada (proračun izmjenjivača topline), tj. posebno su obrađene relacije za preliminarni proračun kao i za prošireni proračun. U praktičnom dijelu, najprije se provodi preliminarni proračun koji se bazira na “Kern“ metodi a zatim prošireni koji se provodi pomoću “Bell Delaware“ i “Shell number“ metode a sve za odabranu konfiguraciju izmjenjivača topline, tj. cijevi u plaštu, E tip, protustrujne konfiguracije. Svi proračuni će biti napravljeni u programu Engineering Equation Solver (EES). Na kraju rada u analizi rezultati dobiveni preliminarnim i proširenim proračunom se uspoređuju i argumentiraju. Te na temelju dobivenih geometrijskih podataka iz proširenog proračuna konstruiran je izmjenjivač topline.The topic of this paper is thermodynamic calculation of heat exchange and checking and proving whether the heat exchanger is possible in the selected configuration, and checking and proving that temperature crossings occur, and if so, determine in what quantity and choose a solution to reduce or eliminate the occurrence of temperature intersections. The introductory (theoretical part) explains the main concepts of heat exchangers, recuperative type Shell and Tube Heat Exchangers, performance, divisions, exchanger applications as well as the principle and mode of operation. Then an explanation of all the relations used in the experimental part of the paper is presented, the relations for the preliminary calculation as well as for the extended calculation are treated separately. In the experimental part, a preliminary calculation based on the "Kern" method is performed first and then an extended calculation is performed using the "Bell Delaware" and "Shell number" methods, all for the selected heat exchanger configuration, Shell and tube, E type, countercurrent configurations. All calculations will be made in the Engineering Equation Solver (EES) software. At the end of this paper an analysis, the results obtained by the preliminary and extended calculation are compared and argued. And on the basis of the obtained geometric data from the extended calculation, the heat exchanger itself was constructe