226 W. Yehia et al: Proposed Hybrid Power System... Proposed Hybrid Power System for Short Route Ferries Prijedlog hibridnog porivnog sustava za trajekte na kraćim rutama DOI 10.17818/NM/2020/3.6 UDK 629.5:03 502.21:523.9 Review / Pregledni rad Paper accepted / Rukopis primljen: 15. 4. 2020. W. Yehia Port Said University Faculty of Engineering Naval Architecture and Marine Engineering Department, Egypt E-mail: waleed.yehia@gmail.com L. Kamar Port Said University Faculty of Engineering Naval Architecture and Marine Engineering Department, Egypt E-mail: laila.kamar@eng.psu.edu.eg M. A. Hassan M. Sc. Student Port Said University Faculty of Engineering Naval Architecture and Marine Engineering Department, Egypt E-mail: marine_eng.mony@hotmail.com M. M. Moustafa Port Said University Faculty of Engineering Naval Architecture and Marine Engineering Department, Egypt E-mail: Moustafa3875@eng.psu.edu.eg Summary A fractional fuel consumption saving as well as pollution cuts will be a thinking pattern or a key concern in modern ship designs. Recent advances in technology for solar cells and photovoltaic (PV) modules have resulted in solar power being a cost-efective fuel reduction alternative for this objective. This paper is intended to provide a hybrid solar diesel power system for short-run ferries. This work proposes and emphasizes the energy efciency, cost efciency and minimal environmental impact of hybrid-powered ferries with solar diesel. The proposed system has been studied on the example of passenger-car ferry connecting the two banks of the Suez Canal at Port Said city - Egypt. Economic and environmental analyses have been conducted to determine and measure the advantages of the proposed system. The results show an economically viable and environmentally sustainable system if it were treated as a long-term investment. Compared to the equivalent diesel generator system, this system reduces exhaust emissions by about 375 tonnes per year. The fuel cost savings achieved are also signifcant. Sažetak Bilo kakva ušteda u potrošnji goriva i smanjenje zagađenja predstavljat će temelj za promišljanje ili najvažniji problem u dizajnu brodova. Novija tehnološka otkrića u području solarnih ćelija i fotonaponskih (PV) modula dovela su do toga da je solarna energija postala alternativa u smislu ekonomičnog smanjenja potrošnje goriva. U ovome radu predlaže se hibridni dizelski pogonski sustav na solarnu energiju za trajekte na kraćim rutama. U radu predlaže se i ističe energetska učinkovitost, ekonomičnost i najmanji utjecaj na okoliš trajekata na solarni dizelski hibridni pogon. Istraživanje predloženog sustava provedeno je na trajektu za prijevoz putnika i vozila koji povezuje dvije obale Sueskog kanala u gradu Port Said (Egipat). Provedene su ekonomske analize i analize utjecaja na okoliš da bi se utvrdile i izmjerile prednosti predloženoga sustava. Rezultati pokazuju da je sustav ekonomski izvediv i u skladu s održivosti okoliša ako se tretira kao dugoročno ulaganje. U usporedbi s dizelskim generatorskim sustavom, ovaj sustav smanjuje emisiju ispušnih plinova za oko 375 tona godišnje. Uštede na troškovima potrošnje goriva također su značajne. KEY WORDS solar energy photovoltaic hybrid solar diesel emissions KLJUČNE RIJEČI solarna energija fotonaponski hibridni solarni dizelski emisije 1. INTRODUCTION / Uvod Nowadays, reducing exhaust gasses emitted from seagoing ships is actually one of the most important environmental concerns in the marine industry. In addition, the international regulations have become stricter on this issue. Hence, many ship operators have started to rely on alternative energy sources to reduce emissions from ships and therefore work in an environmentally friendly manner. In this regard, especially with the volatility of oil prices, renewable energy sources have become more attractive to ship owners. Since the ocean is exposed to vast quantities of sun rays, solar energy can be considered as one of the most promising energy sources in the maritime sector. It also reduces the use of fossil fuels, with consequent economic and environmental advantages. The Photovoltaic (PV) solar system has recently been regarded as one of the most important alternative sources of energy. Hence, solar photovoltaic systems are commonly used to provide all or part of the electrical requirements on board marine units. Where many multihull marine units (catamaran and trimaran) are designed to use PV solar system as a hybrid propulsion system together with diesel generators[1]. Palmer and Sembler[2] have proposed a high-efciency hybrid system which would generate electrical power onboard a very large crude carrier. The proposed system includes PV solar panels, a solid-oxide fuel cell, a gas turbine, a vapor generator for heat recovery and a steam turbine [2]. The results showed that the proposed system would cover only about 78 percent of the hotel load required in port. Sulaima and Saharuddin[3] tested the feasibility of using solar photovoltaic system as an auxiliary power source for the auxiliary engines of a 16.5 m long diving boat. The results indicated that some economic and