OPTIMIZATION OF AN ORGANIC RANKINE CYCLE USING WASTE HEAT FROM THE EXHAUSTE GASES OF MARINE DIESEL ENGINE

U ovom diplomskom radu je opisan i proračunat organski Rankineov ciklus za iskorištavanje otpadne topline ispušnih plinova brodskog Diesel motora. Opisan je ukratko Dieselov motor kao izvor topline, dijelovi organskog Rankineovog ciklusa, te neki od radnih medija koji su odabrani za usporedbu u zadatku. Usporedbom u zadatku između odabranih radnih medija, te također pri različitim radnim uvjetima određen je optimalni radni fluid n-Pentan za uvjete koji su postavljeni ovim zadatkom. Teorijska analiza pokazala je da je za svaki ORC sustav moguće primijeniti više različitih radnih medija. Računalnim simulacijama dobivena je razlika učinkovitosti i isplativosti ORC sustava ovisno o korištenim radnim medijima. Može se zaključiti da postoji više radnih fluida za primjenu u ORC sustavu, te da ovisno o uvjetima ili okolini, postoji opcija za odabir pogodnijeg i sigurnijeg, a ne nužno optimalnog.In this graduate thesis organic Rankine cycle which recovers marine Diesel engine waste heat from exhaust gases is described and calculated. Diesel engine as a heat source, components of organic Rankine cycle and some of organic working fluids selected for comparison in this task are briefly described. By comparing selected working fluids, under different working conditions from the task, optimal working fluid has been determined under conditions set by this task. Theoretical analysis showed how for every other ORC system it is possible to use multiple different working fluids. While the difference may be indicated between chosen working fluids by calculations, which reflects to the efficiency coefficient and cost-effectiveness of such systems. It can be concluded that there is numerous working fluids usable in the ORC systems, and depending on the conditions or environment, there is various options which working fluid would be more suitable and safer one, and not necessarily the optimal one