Assessment of a novel system utilizing gases exhausted from a ship's engine for power, cooling, and desalinated water generation
Document Type
Article
Publication Date
2-5-2021
Abstract
In this paper, an auxiliary trigeneration system driven by gases exhausted from a ship's engine is analyzed from thermodynamic standpoint. The system generates power, cooling, and desalinated water embracing a Kalina cycle in integration with an ejector refrigeration cycle and a humidification dehumidification-based desalination. A parametric study is conducted to analyze the influence of variation in some design parameters on the system's performance. The results indicates that both energy and exergy efficiencies enhance as separator pressure, vapor generator terminal temperature difference and condenser temperature decrease, and evaporator temperature increase. Additionally, Ammonia concentration in the Ammonia-water mixture is seen to have opposing effects on efficiencies. The desalinated water production rate reaches a maximum value of 1.34 kg/s when the Ammonia concentration is equal to 22-23%. Moreover, this parameter declines as the separator pressure increases, and remains unchanged when the evaporator temperature varies. As for cooling, it is deduced that augmentations in separator pressure, evaporator temperature, and vapor generator terminal temperature difference contribute to improvements in cooling output. In a regular input situation, energy and exergy efficiencies, net output power, cooling, and desalinated water production rate are found to be 60.4%, 39.7%, 559.8 kW, 604.7 kW, and 1.31 kg/s, respectively.
Keywords
Energy and exergy, Trigeneration, Kalina cycle, Ejector refrigeration cycle, Desalinated water, Ship's engine
Divisions
fac_eng
Publication Title
Applied Thermal Engineering
Volume
184
Publisher
Pergamon-Elsevier Science Ltd
Publisher Location
THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND