Multi objective optimization and 3E analyses of a novel supercritical/transcritical CO2 waste heat recovery from a ship exhaust

Abstract

Waste heat recovery systems are a promising solution to reduce the overall energy consumption. These systems are capable of producing energy from both high grade and low-grade waste heat without producing any pollution. This paper proposes a novel waste heat recovery system installed on a ship that can produce power and cooling by supercritical/transcritical CO2 waste heat recovery. For this purpose, supercritical and transcritical carbon dioxide cycles are integrated in a special configuration to recover the highest amount of energy in the ship. To analyze the system, 3E analyses (Energy, Exergy, and Economic) are utilized. Then, to achieve the best performance, the most important and influential parameters have been optimized with the aim of increasing energy, exergy efficiency, and reducing the capital cost. Based on the obtained results, energy, exergy efficiency, and capital cost of the plant reaches 69.6%, 42.3%, and 2.5 M$ respectively in the best condition. Finally, at design condition, the system produces a net power of 9.061 kW and 19.522 kW of cooling.