THERMODYNAMIC OPTIMIZATION OF RANKINE CYCLE WITH CLOSED FEED-WATER HEATER

U ovom radu provedena je, teorijski i računski, optimizacija Rankineovog ciklusa sa zatvorenim zagrijačem napojne vode. U zadatku je bilo potrebno opisati princip rada regenerativnog Rankineovog ciklusa, te računski prikazati proračun Rankineovog ciklusa sa zatvorenim zagrijačem napojne vode. Uz to su izvršeni proračuni s promjenama u ciklusu s ciljem mogućeg povećanja termičkog stupnja djelovanja Rankineovog ciklusa. Teorijskom analizom utvrđeno je da je Rankineov ciklus puno prihvatljiviji u odnosu na Carnotov ciklus, ali i da su isto tako u Rankineovom ciklusu potrebna poboljšanja poput zagrijača vode, kako bi taj ciklus imao veći termički stupanj djelovanja. Rezultat analize prikazuje da zadane promjene u ciklusu samo smanjuju termički stupanj djelovanja, odnosno da se znatnije povećanje može postići samo primjenom s više zagrijača napojne vode. Proračuni su izvršeni u programskom paketu Engineering Equation Solver (EES).In this work theoretical analysis and mathematical optimisation of Rankine cycle with closed feed-water heater is performed. In the assignment, it was necessary to describe a method of regenerative Rankine cycle, and mathematical calculation of Rankine cycle with closed feed-water heater. Calculations of different variations of Rankine cycle with a goal of rising thermal efficiency were executed. In the theoretical analysis, it is found that Rankine cycle is much more acceptable than Carnot cycle, but in Rankine cycle some improvements such as application of feed-water heater are required, to get the cycle higher thermal efficiency. The result of analysis shows that the default changes in the process decreases thermal efficiency significantly increasing of thermal efficiency can be achieved by the application of elements like feed-water heaters. Calculations were made in the Engineering Equation Solver (EES) program package