Journal of Marine Engineering and Technology, no.1, 2019 (SCI Expanded İndekslerine Giren Dergi)
Nowadays, shipping industry faces challenges of energy efficiency and reducing of fuel consumption.
Moreover, Waste Heat Recovery Systems (WHRS) regarding energy efficiency have a larger focus
to utilise the heat energy lost from all thermal processes from ship engines. WHRS is one of the best
methods to reduce fuel consumption and implicitly emissions. Refrigeration system, which can be
evaluated as one of these systems, has a high energy efficiency potential on ships. In this study,
exergoeconomic and air emission analyses of a case study ship named M/V Ince Ilgaz have been
performed by comparing Vapour Compression Refrigeration System (VCRS) and VCRS with WHRS
on exergy destruction and Second Law Efficiency in case of variable sea water temperature with
15 different refrigerants. Furthermore, a novel proposed WHRS is used for preheating of an accommodation
water which leads reducing of exergy destruction about 9.31–10.60% while using R134A
refrigerant. The fuel consumption due to refrigerant compressor has a 36% increase with the 10°C
increment of sea water temperature. The increase of CO2, SO2, NOx and Particular Matter (PM) emissions
is found about 183.40, 3.10, 4.65 and 0.47 tonnes, by the increase of sea water temperature
from 20°C to 30°C for the fleet of 15 ships, respectively. In conclusion, using waste heat recovery on
refrigeration system could directly reduce fuel consumption and air emissions.