Thermoeconomic optimization of a hybrid power and cooling facility using waste heat recovery from a marine diesel engine.

Improving energy efficiency and reducing environmental impacts have become essential goals in today's world. Finding ways to utilize waste heat for generating both power and cooling is a meaningful step toward more sustainable energy use and better resource management. In this research, the aim is to enhance the basic efficiency of diesel engines by harnessing the waste heat. By merging the diesel engine cycle with the ORC and the ejector-heat pipe cooling process, we can simultaneously generate power and cooling. This study focuses on tapping into the unused heat from a specific marine diesel engine to produce both power and cooling. The primary motivation is to cut down on fossil fuel usage due to its adverse environmental impact. To put it another way, this research focuses on increasing the base efficiency of diesel engines by recycling waste heat. By systematically integrating the diesel engine cycle with the organic Rankine cycle and the ejector-heat pipe cooling system, we can produce both power and cooling. Ultimately, 2-archive multi-objective cuckoo search algorithm-based optimization (MOCS2arc algorithm) establishes the optimized conceptual design. The system offers an electrical output of 72.01 kW and cooling capabilities of 56.83 kW, achieving an exergy efficiency of 60.4%. Moreover, economic metrics, including the facility's unit cost of the product ($1259/GJ) and annual exergy destruction costs ($386,670), were ascertained. Under the optimization, exergy efficacy and SUCP of 64.9% and $902.21/GJ are achievable.